1
CXA1878Q
64 pin QFP (Plastic)
E95933A5Z-PK
Dolby
B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier
Description
The CXA1878Q is a bipolar IC with a built-in Dolby
B-C type noise reduction system (NR), Dolby S type
select switch, recording/playback equalizer, electronic
volume, and bias control circuit.
Use of this IC in combination with two CXA1417S/Q
completes a Dolby B-C-S type NR stereo system.
Features
Dolby B-C type NR
Built-in filter required for recording/playback equalizer
amplifiers
Recording mute function
(requiring only an external time constant circuit to
implement soft mute)
Fade in/out DC controllable
NORM/CrO
2
/METAL tape mode switching function
NORM/HIGH tape speed switching function
DC controllable for recording level calibration
(approximately 6dB variable)
DC controllable for high frequency equalizer
amplifier gain (approximately 4dB variable)
Playback deck A/B select switch
Recording volume control
Bias control circuit
Meter circuit
Applications
Recording/playback equalizer amplifier for stereo
analog cassette decks
(Applicable to ALPS ELECTRIC CO., LTD.
HADKH55 series heads)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
Supply voltage
V
CC
17
V
Operating temperature
Topr 20 to +75 C
Storage temperature
Tstg 65 to +150 C
Allowable power dissipation P
D
1020
mW
Operating Conditions
Supply voltage
(V
CC
V
EE
)
6.5 to 8.0
V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications
information may be obtained.
"Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation.
2
CXA1878Q
VOLUME
PASS
MUTE
NR
LINE
PB EQ
DECK
B
A
OFF
ON
ON
CAL
MUTE
OFF
ON
CAL
REC
PB
REC
PB
REC-EQ
AMS
DOLBY
B-C NR
GND
CAL
B/C
S
VOLUME
CONT
METER2
D GND
GND
GND
VOLUME
PB EQ
REC-EQ
S
B/C
CAL
METER1
ON
CAL
OFF
LINE
PASS
MUTE
NR
PB
REC
REC
PB
MOA
MOA
ON
OFF
GND
DOLBY
B-C NR
CAL
METER
METER
ON
MUTE
CXA1878Q
V
EE
METAL
NORM
CrO
2
20
21
22
23
24
25
26
27
28
29
30
31
32
40
39
38
37
36
35
34
33
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
63
64
61
62
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
GP CAL
V
EE
DGND
REC BAL
REC VOL
METER2
METER1
DECK A/B
(A/B)
B EQ
(NORM/CrO
2
/METAL)
A EQ
(120
/70
)
DV
CC
V
CC
MODE SW
(REC/PB)
VOL OUT2
VOL IN2
NR PBIN2
PB OUT2
PB INB2
PB INA2
GND
PB INA1
PB INB1
PB OUT1
NR PBIN1
VOL IN1
VOL OUT1
NR RECIN1
LINE OUT1
NR TCH1
NR TCL1
NR OUT1
S IN1
REC IN1
NR RECOUT1
REC OUT1
IREF
NR IREF
MT C1
BIAS M
BIAS C
BIAS N
AMS SW
(OFF/AMS/BS)
PASS SW
(NR/MUTE/PASS)
METER SW
(ON/MUTE)
SPEED
(NS/HS)
NR RECIN2
LINE OUT2
NR TCH2
NR TCL2
NR OUT2
S IN2
REC IN2
NR RECOUT2
REC OUT2
REC MUTE
CAL IN
MT C2
BS FB
AMS FB
AMS TC
AMS OUT
S SW
(S/BC/CAL)
NR SW
(OFF/B/C)
REC CAL
DECK
B
A
GND
Block Diagram and Pin Configuration
3
CXA1878Q
Pin Description
1
51
2
50
3
49
4
48
NR RECIN1
NR RECIN2
LINE OUT1
LINE OUT2
NR TCH1
NR TCH2
NR TCL1
NR TCL2
0.0V
0.0V
V
EE
+0.4V
V
EE
+0.4V
26dBv
4dBv
--
--
I
O
--
--
40k
--
--
--
Recording equalizer
amplifier input
Line output
Time constant for the
HLS
Time constant for the
LLS
51
1
40k
1.5k
GND
2
50
300
300
3.4k
3
49
330k
36k
13k
4
48
13.5k
480k
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
DC
AC
(Ta = 25C, V
CC
= 7.0V, V
EE
= 7.0V, DV
CC
= 5.0V)
4
CXA1878Q
5
47
6
46
7
45
8
44
NR OUT1
NR OUT2
S IN1
S IN2
REC IN1
REC IN2
NR RECOUT1
NR RECOUT2
0.0V
0.0V
0.0V
0.0V
6dBm
(7dBv)
6dBm
(7dBv)
24dBv
6dBm
(7dBv)
O
I
I
O
--
40k
50k
--
Dolby S type NR output
Dolby S type NR input
Recording equalizer
amplifier input
Dolby NR recording
signal output
5
47
GND
1.5k
12k
192
192
20k
40k
GND
6
46
50k
GND
7
45
9.5k
8
44
GND
1.5k
22.5k
211
211
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
5
CXA1878Q
9
43
10
11
12
40
REC OUT1
REC OUT2
IREF
NR IREF
MT C1
MT C2
0.0V
V
EE
+1.2V
V
EE
+1.2V
0.0V
3dBv
--
--
--
O
--
--
O
--
--
--
--
Recording equalizer
amplifier output
Reference current
setting for built-in
recording/playback
equalizer amplifier
The reference current
can be set by
connecting a resistor
between this pin and
V
EE
.
Reference current
setting for built-in Dolby
NR
The reference current
can be set by
connecting a resistor
between this pin and
V
EE
.
DC cut capacitance
9
43
50k
200
200
10
192
6k
40k
11
8k
14k
300
300
12
40
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
6
CXA1878Q
13
14
15
16
17
18
BIAS M
BIAS C
BIAS N
AMS SW
PASS SW
METER SW
--
2.5V
when
open
2.5V
when
open
--
--
--
--
--
O
I
I
I
--
--
--
--
Recording bias control
voltage output
AMS mode control
Mode select switch for
AMS/BS amplifier
High: BS mode
Medium: AMS mode
Low: AMS/BS OFF mode
[BS mode = Music
signal interval detection
during playback]
[AMS mode = Music
signal detection during
FF/REW]
PASS mode control
H : PASS
M : MUTE
L : NR ON
Meter mode control
Meter amplifier output
ON/OFF select switch
High: Meter output
OFF (mute)
Low : Meter output ON
100k
14
15
13
50k
5k
16
DGND
5k
24k
50k
5k
DGND
5k
17
DGND
10k
18
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
7
CXA1878Q
19
20
23
24
SPEED
MODE SW
A EQ
B EQ
--
--
2.5V
when
open
2.5V
when
open
--
--
--
--
I
I
I
I
--
--
--
--
Tape speed selection
Normal speed/
double speed
selection
High: Double speed
Low : Normal speed
Recording/playback
mode control
Recording/playback
mode selection
High : Recording mode
Low : Playback mode
21
22
V
CC
DV
CC
7.0V
5.0V
--
--
I
I
--
--
Positive power supply
Reference power
supply for mode control
Deck A playback
equalizer amplifier
control
120s/70s selection
High: 70s
Low : 120s
(Built-in equalizer
amplifier flat)
Control of deck B
playback equalizer
amplifier mode,
recording equalizer
amplifier mode, and
recording bias mode
NORM/CrO
2
/METAL
selection
High
: METAL
Medium : CrO
2
Low
: NORM
10k
DGND
19
10k
2k
20
6k
10k
DGND
23
10k
DGND
24
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
8
CXA1878Q
25
26
27
28
29
DECK A/B
METER1
METER2
REC VOL
REC BAL
--
1.6V
--
2.5V
when
open
--
1.1dBv
--
--
I
O
I
I
--
--
100k
100k
Playback deck A/B
select control
Playback equalizer
amplifier input
selection
High: PB INB
Low : PB INA
Level meter amplifier
output
Recording volume level
control
High: Output signal
level increased
Low : Output signal
level reduced
Recording volume
balance control
High : Only VOL OUT2
output level
reduced
Low : Only VOL OUT1
output level
reduced
Neither VOL OUT1
nor 2 output levels are
attenuated at the
control voltage of 2.5V.
30
DGND
0.0V
Connect to GND.
10k
DGND
25
27
60k
10k
26
60k
40k
28
GND
70k
8k
29
8k
21k
30k
DV
CC
/2
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
9
CXA1878Q
32
33
34
35
GP CAL
REC CAL
NR SW
S SW
2.5V
when
open
2.5V
when
open
2.5V
when
open
2.5V
when
open
--
--
--
--
I
I
I
I
54k
54k
50k
50k
Recording equalizer
amplifier high frequency
calibration
Controlled with DC
voltages of 0 to 5V.
High: High frequency
level gain
increased
Low : High frequency
level gain
reduced
Leave this pin open
when not using the
high frequency
calibration function.
Recording equalizer
amplifier calibration
Controlled with DC
voltages of 0 to 5V.
High: Recording level
gain increased
Low : Recording level
gain reduced
Leave this pin open
when not using the
recording calibration
function.
NR control
High: C type
Medium: B type
Low: NR OFF
Dolby S type selection
Select the calibration
mode with this pin.
High: CALIBRATION
Medium: B-C type
Low: S type
31
V
EE
7.0V
Negative power supply
54k
32
54k
33
2k
6k
34
50k
DV
CC
/2
2k
6k
50k
DV
CC
/2
35
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
10
CXA1878Q
36
37
38
39
AMS OUT
AMS TC
AMS FB
BS FB
0.0V
0.0V
0.0V
0.0V
--
--
--
--
O
--
--
--
--
--
--
--
AMS amplifier output
Time constant for the
AMS
Feedback during AMS
mode
Feedback during BS
mode
10k
36
10k
10k
DGND
1k
37
40k
100k
38
2p
100k
2p
39
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
11
CXA1878Q
41
42
64
52
63
53
CAL IN
REC MUTE
VOL OUT1
VOL OUT2
VOL IN1
VOL IN2
0.0V
--
0.0V
0.0V
26dBv
--
10dBv
10dBv
I
I
O
I
10k
--
50k
Calibration signal input
Recording mute
ON/OFF selection
The recording mute is
controlled with DC
voltages of 0 to 5V.
High: Recording mute OFF
Low : Recording mute ON
Soft mute and fader
functions can be set by
changing the time
constant of the external
time constant circuit.
Recording volume
amplifier output
Recording volume
amplifier input
10k
41
1.5k
GND
30k
GND
42
52
500
500
5p
6.5k
64
53
63
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
12
CXA1878Q
62
54
61
55
59
60
57
56
58
NR PBIN1
NR PBIN2
PB OUT1
PB OUT2
PB INA1
PB INB1
PB INA2
PB INB2
GND
0.0V
0.0V
0.0V
0.0V
11dBv
11dBv
31dBv
--
I
I
I
--
40k
--
50k
--
Dolby NR playback input
Playback equalizer
amplifier output
Playback equalizer
amplifier input
Ground
5k
GND
54
62
2.9k
4k
GND
35.5k
500
500
8p
30k
55
61
50k
GND
60
56
57
59
DC
AC
Pin
No.
Symbol
I/O
Z (in)
Equivalent circuit
Description
Typical pin voltage
13
CXA1878Q
10dBv
10dBv
11dBv
C8
0.1
S18
R27
10k
R18
5.1k
C19
2.2
C18
0.1
C7
0.1
R26
11.6k
(12k//330k)
11dBv
C17 1.0
R16 2.7k
R4
100
S9
31dBv
C16
0.1
R15 5.1k
C6
0.1
R25
160k
S1
CCIR
S5
1kHz BPF
DIN Audio
"A" WTG
S2
S3
S4
AC
Voltmeter
Distortion
Analyzer
Oscilloscope
V
EE
R2
1.2k
GND
R1
1.2k
Amp
2.2dB
Audio
SG
DC
Voltmeter
31dBv
C15
0.1
C5
0.1
R24
160k
R14 5.1k
S15
GND
R13 5.1k
31dBv
C14
0.1
S14
R23
160k
C4
0.1
31dBv
C13
0.1
S13
R22
160k
C3
0.1
R12 5.1k
11dBv
C12
1.0
S8
11dBv
C11
0.1
S12
C2
0.1
R10 5.1k
R7
100
R11 2.7k
R21
11.6k
(12k//330k)
S7
R6
100
10dBv
C9
1.0
R8
2.7k
R30
5.1k
26dBv
C23
2.2
R28
86k
(100k//620k)
C21
0.1
S19
4dBv
C25
4.7
R32
2.7k
S21
C27
0.1
C29
0.068
7dBv
7dBv
C31
2.2
R36
5.1k
24dBv
C35
2.2
R34
32.1k
(1M//33k)
C33
0.1
S23
7dBv
C37
4.7
R39
2.7k
S25
3dBv
C39
2.2
R41
2.7k
S27
R42
27k
R45
27k
C43
1.0
R29
86k
26dBv
C24
2.2
S20
R31
5.1k
C22
0.1
S22
R33
2.7k
4dBv
C26
4.7
C28
0.1
C30
0.068
7dBv
7dBv
C32
2.2
24dBv
C36
2.2
S24
R37
5.1k
C34
0.1
S26
7dBv
C38
4.7
R38
2.7k
R35
32.1k
(1M//33k)
S28
3dBv
C40
4.7
R40
2.7k
C41
0.1
R43
86k
(100k//
620k)
26dBv
C42
2.2
R44
5.1k
A
GND
C50
10
R56
1k
S34
S57
GND
S35
S58
S36
S51
R57
1k
S37
S52
CALIBRATION
DOLBY B/C
DOLBY S
DOLBY C
DOLBY B
DOLBY OFF
R58
1k
S54
MUTE ON
MUTE OFF
V1
0.5
V2
2.5
V3
4.2
H
M
L
C44
1.0
R47
1k
C45
1.5
R49
10k
C46
0.015
C47
0.1
R52
1MEG
R54
100k
R55
1k
S31
Power
Supply
+1.1dBv
GND
GND
S33
S50
GND
S32
S49
GND
GND
R60
56k
C52
3.3
S56
+1.1dBv
GND
R59
56k
C51
3.3
S55
S48
R61
1k
PB IN A
PB IN B
R68
1k
S47
S40
S46
R67
1k
PB A EQ FLAT
PB A EQ 70
METAL
CrO
2
NORMAL
DC
Ammeter
A
DC
Ammeter
GND
Vcc
V
EE
C49
100
GND
C48
100
GND
S45
R66
1k
PB
REC
NORMAL
SPEED
HIGH SPEED
METER ON
METER MUTE
MUTE
PASS
DOLBY NR
AMS MODE
AMS OFF
R65
1k
R64
1k
R63
1k
R62
1k
BS MODE
A
DC
Ammeter
5V
R53
100k
S31
S38
R51
1k
R48
1k
R46
1k
S31
S31
S31
I1
2mA
R50
1k
S38
20
21
22
23
24
25
26
27
28
29
30
31
32
40
39
38
37
36
35
34
33
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
63
64
61
62
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
GP CAL
V
EE
DGND
REC BAL
REC VOL
METER2
METER1
DECK A/B
B EQ
A EQ
DVcc
Vcc
MODE
SW
VOL
OUT2
VOL IN2
NR PBIN2
PB OUT2
PB INB2
PB INA2
GND
PB INA1
PB INB1
PB OUT1
NR PBIN1
VOL IN1
VOL
OUT1
NR RECIN1
LINE OUT1
NR TCH1
NR TCL1
NR OUT1
S IN1
REC IN1
NR RECOUT1
REC OUT1
IREF
NR IREF
MT C1
BIAS M
BIAS C
BIAS N
AMS SW
PASS SW
METER SW
SPEED
NR RECIN2
LINE OUT2
NR TCH2
NR TCL2
NR OUT2
S IN2
REC IN2
NR RECOUT2
REC OUT2
REC MUTE
CAL IN
MT C2
BS FB
AMS FB
AMS TC
AMS OUT
S SW
NR SW
REC
CAL
C20
4.7
R19
2.7k
R17 5.1k
10dBv
C10
2.2
R9 5.1k
C1
0.1
R20
10k
S16
R3
50k
S6
GND
GND
Amp
0dB or 30dB
R5
100
S10
S44
S43
S38
S41
S39
S53
S38
S17
S29
S11
R61 50k
R62 50k
Electrical Characteristics Measurement Circuit
14
CXA1878Q
C2
75p
C28
0.47
C12
4.7
R18
2k
R2
12k
REC
GND
DOLBY S NR
6dBv
PB Only HEAD
[DECK-A (R)]
V
EE
GND
R-ch
L-ch
LINE OUT
R20
10k
HEADPHONES
L2
27mH
PB Amp
GND
R-ch
L-ch
LINE IN
R1
12k
R8
4.7k
R7
4.7k
R12
100k
C11
4.7
R10
100k
R4
15k
R3
15k
6dBv
6dBv
C10
2.2
C9
2.2
R9
180k
C16
2.2
R16
8.2k
C18
2.2
R14
3.3k
C22
0.068
C20
0.1
MPX
Filter
6dBv
10dBv
10dBv
3dBv
R11
100k
GND
C8
150p
C14
3.3
R6
12k
C7
2.2
31dBv
PB Only HEAD
GND
[DECK-A (L)]
PB Amp
C6
2.2
31dBv
PB Amp
C5
2.2
31dBv
GND
PB Amp
C4
2.2
31dBv
REC/PB HEAD
[DECK-B (R)]
[DECK-B (L)]
PB
REC/PB
REC
GND
REC/PB HEAD
[DECK-B]
PB
REC/PB
GND
ERASE HEAD
Bias
OSC
BIAS
CONTROL
C15
2.2
C1
75p
L1
27mH
3dBv
GND
C3
150p
C13
3.3
R5
12k
C27
2.2
R24
4.7k
R23
8.2k
C24
2.2
CAL
OSC
C29
2.2
R27
1k
R28
10k
R29
1MEG
R30
100k
C34
0.1
C32
1.5
C33
0.015
C31
1.0
GND
R34
50k
HP Amp
R40
220
HP Amp
R39
220
R38
10k
R37
10k
C39
10
GND
R36
50k
REC CAL
GP CAL
REC CALIBRATION
DV
CC
C38
10
C37
1
C36
1
GND
R33
50k
GND
R35
50k
REC LEVEL & BALANSE
to AMS Control
L : SIGNAL EXIST
H : NO SIGNAL
METER (R)
METER (L)
+1dBv
+1dBv
C42
10
DV
CC
V
CC
C41
10
C25
0.47
R17
2k
DOLBY S NR
R19
10k
R15
8.2k
R13
3.3k
MPX
Filter
R22
8.2k
R21
4.7k
R26
20k
C30
1.0
REC MUTE
S SW
NR SW
DECK A/B
B-DECK EQ
A-DECK EQ
MODE (REC/PB)
SPEED
METER SW
PASS SW
AMS/BS
to MICROCOMPUTER
R32
56k
C40
3.3
R31
56k
C35
3.3
R25
27k
C26
2.2
C23
2.2
C21
0.068
C19
0.1
C17
2.2
GP CAL
V
EE
DGND
REC BAL
REC VOL
METER2
METER1
DECK A/B
B EQ
A EQ
DV
CC
V
CC
MODE
SW
VOL
OUT2
VOL IN2
NR PBIN2
PB OUT2
PB INB2
PB INA2
GND
PB INA1
PB INB1
PB OUT1
NR PBIN1
VOL IN1
VOL
OUT1
NR RECIN1
LINE OUT1
NR TCH1
NR TCL1
NR OUT1
S IN1
REC IN1
NR RECOUT1
REC OUT1
IREF
NR IREF
MT C1
BIAS M
BIAS C
BIAS N
AMS SW
PASS SW
METER SW
SPEED
NR RECIN2
LINE OUT2
NR TCH2
NR TCL2
NR OUT2
S IN2
REC IN2
NR RECOUT2
REC OUT2
REC MUTE
CAL IN
MT C2
BS FB
AMS FB
AMS TC
AMS OUT
S SW
NR SW
REC
CAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
R42
50k
R41
50k
Application Circuit
15
CXA1878Q
Electrical Characteristics
(Ta = 25C, V
CC
= 7.0V, V
EE
= 7.0V)
Block
Entire LSI
Entire LSI
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Current consumption (ICC)
Operating voltage range
(positive/negative dual power
supplies)
Recording equalizer amplifier
Recording reference output
level
NORM-NORM mode
Recording equalizer amplifier
Recording reference input level
NORM-NORM mode
NORM-NORM mode
REC-EQ frequency response 1
(3kHz, 20dB)
NORM-NORM mode
REC-EQ frequency response 2
(8kHz, 20dB)
NORM-NORM mode
REC-EQ frequency response 3
(12kHz, 20dB)
CrO
2
-NORM mode
REC-EQ frequency response 1
(3kHz, 20dB)
CrO
2
-NORM mode
REC-EQ frequency response 2
(8kHz, 20dB)
CrO
2
-NORM mode
REC-EQ frequency response 3
(12kHz, 20dB)
METAL-NORM mode
REC-EQ frequency response 1
(3kHz, 20dB)
Recording equalizer amplifier reference output level (315Hz)
(This output level is the tape reference 0dB which generates magnetic
flux of 250nWb/m)
All of the recording equalizer amplifier blocks use this level as their
reference level.
Input level when the reference output level is 315Hz, 3.0dBv
(For measurement, input a 315Hz, 24.5dBv signal to the REC EQ IN
pins (Pins 7 and 45) and then measure the output level.)
NORM-tape, NORM-speed mode
Input a 3kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
NORM-tape, NORM-speed mode
Input a 8kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
NORM-tape, NORM-speed mode
Input a 12kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, NORM-speed mode
Input a 3kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, NORM-speed mode
Input a 8kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, NORM-speed mode
Input a 12kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
METAL-tape, NORM-speed mode
Input a 3kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
28
6.5
--
26
1.9
2.5
7.3
2.9
7.1
11.3
3.9
38
7.0
3.0
24.5
0.4
4.5
10.3
4.4
9.1
14.3
5.4
48
8.0
--
23
1.0
6.5
13.3
5.9
11.1
17.3
6.9
mA
V
dBv
dBv
dB
dB
dB
dB
dB
dB
dB
Item
Conditions
Min.
Typ.
Max.
Unit
16
CXA1878Q
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
METAL-NORM mode
REC-EQ frequency response 2
(8kHz, 20dB)
METAL-NORM mode
REC-EQ frequency response 3
(12kHz, 20dB)
NORM-HIGH mode
REC-EQ frequency response 1
(5kHz, 20dB)
NORM-HIGH mode
REC-EQ frequency response 2
(15kHz, 20dB)
NORM-HIGH mode
REC-EQ frequency response 3
(20kHz, 20dB)
CrO
2
-HIGH mode
REC-EQ frequency response 1
(5kHz, 20dB)
CrO
2
-HIGH mode
REC-EQ frequency response 2
(15kHz, 20dB)
CrO
2
-HIGH mode
REC-EQ frequency response 3
(20kHz, 20dB)
METAL-HIGH mode
REC-EQ frequency response 1
(5kHz, 20dB)
METAL-HIGH mode
REC-EQ frequency response 2
(15kHz, 20dB)
METAL-HIGH mode
REC-EQ frequency response 3
(20kHz, 20dB)
METAL-tape, NORM-speed mode
Input a 8kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
METAL-tape, NORM-speed mode
Input a 12kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
NORM-tape, HIGH-speed mode
Input a 5kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
NORM-tape, HIGH-speed mode
Input a 15kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
NORM-tape, HIGH-speed mode
Input a 20kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, HIGH-speed mode
Input a 5kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, HIGH-speed mode
Input a 15kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
CrO
2
-tape, HIGH-speed mode
Input a 20kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
METAL-tape, HIGH-speed mode
Input a 5kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
METAL-tape, HIGH-speed mode
Input a 15kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
METAL-tape, HIGH-speed mode
Input a 20kHz signal (20dB level down) to the REC EQ IN pin and
then measure the relative deviation from NORM-NS, 315Hz mode.
7.1
10.4
1.3
4.0
7.4
3.9
8.6
11.4
5.9
9.5
11.8
9.1
13.4
0.2
6.5
10.9
5.4
11.1
14.9
7.4
12.0
15.3
11.1
16.4
1.7
9.0
14.4
6.9
13.6
18.4
8.9
14.5
18.8
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Block
Item
Conditions
Min.
Typ.
Max.
Unit
17
CXA1878Q
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording
equalizer amplifier
Recording volume
NORM-NORM mode
REC-EQ signal handling
(1kHz, THD = 1%, R
L
= 2.7k
)
NORM-NORM mode
REC-EQ total harmonic distortion
(1kHz, 0.0dB, R
L
= 2.7k
)
NORM-NORM mode
REC-EQ S/N ratio
("A"-WGT filter)
NORM-NORM mode
Output DC offset voltage
(REC OUT pin)
NORM-NORM mode
REC-EQ mute characteristics 1
(REC-MUTE = 0.5V)
NORM-NORM mode
REC-EQ mute characteristics 2
(REC-MUTE = 2.5V)
NORM-NORM mode
REC-EQ REC-CAL characteristics 1
(REC-CAL = 5.0V)
NORM-NORM mode
REC-EQ REC-CAL characteristics 2
(REC-CAL = 0.0V)
NORM-NORM mode
REC-EQ Gp-CAL characteristics 1
(Gp-CAL = 5.0V)
NORM-NORM mode
REC-EQ Gp-CAL characteristics 2
(Gp-CAL = 0.0V)
Recording volume amplifier
Recording volume characteristics 1
(REC-VOL = 5.0V, REC-BAL = 2.5V)
NORM-tape, NORM-speed mode, R
L
= 2.7k
Input a 1kHz signal and set the output level so that THD (total harmonic
distortion) is 1%.
(Measure the distortion of a +11dB level-up signal.)
NORM-tape, NORM-speed mode, R
L
= 2.7k
Input a 1kHz, 0dB (reference input level) signal and measure the distortion.
(Measure the distortion as THD + N.)
NORM-tape, NORM-speed mode, Rg = 5.1k
With no signal, measure the noise using the "A"-WGT filter. (The measured
value is indicated as the relative value compared to the reference level.)
NORM-tape, NORM-speed mode
With no signal, measure the DC offset voltage of the REC OUT pin.
NORM-tape, NORM-speed mode, REC-MUTE = 0.5V
Input a 1kHz signal (+12dB level up) and measure the attenuation
when REC MUTE is ON. (Use a 1kHz BPF.)
NORM-tape, NORM-speed mode, REC-MUTE = 2.5V
Input a 1kHz, 0dB (reference level) signal and measure the attenuation
characteristics curve of the soft mute function (when REC-MUTE = 2.5V).
NORM-tape, NORM-speed mode, REC-CAL = 5.0V
Input a 315Hz signal (20dB level down) and measure the amount of change
compared to when the REC-CAL function is at the standard setting.
NORM-tape, NORM-speed mode, REC-CAL = 0.0V
Input a 315Hz signal (20dB level down) and measure the amount of change
compared to when the REC-CAL function is at the standard setting.
NORM-tape, NORM-speed mode, Gp-CAL = 5.0V
Input a 8kHz signal (20dB level down) and measure the amount of change
compared to when the Gp-CAL function is at the standard setting.
NORM-tape, NORM-speed mode, Gp-CAL = 0.0V
Input a 8kHz signal (20dB level down) and measure the amount of change
compared to when the Gp-CAL function is at the standard setting.
REC-VOL = 5.0V, REC-BAL = 2.5V
Input a 1kHz, 10dBv signal to the VOL IN pin and measure the full
gain of the recording volume amplifier.
11.0
--
57.0
500
--
8.1
4.8
7.5
2.7
4.8
8.0
12.4
0.14
65.0
10.0
99.9
6.6
6.3
6.0
4.2
3.3
9.0
--
0.6
--
500
80
5.1
7.8
4.5
5.7
1.8
10.0
dB
%
dB
mV
dB
dB
dB
dB
dB
dB
dB
Block
Item
Conditions
Min.
Typ.
Max.
Unit
18
CXA1878Q
Recording volume
Recording volume
Recording volume
Recording volume
Recording volume
Recording volume
Recording volume
Recording volume
Line amplifier
Line amplifier
Line amplifier
Recording volume amplifier
Recording volume characteristics 2
(REC-VOL = 2.0V, REC-BAL = 2.5V)
Recording volume amplifier
Recording volume attenuation
(REC-VOL = 0.0V, REC-BAL = 2.5V)
Recording volume amplifier
REC-VOL signal handling
(1kHz, THD = 1%, R
L
= 2.7k
)
Recording volume amplifier
REC-VOL total harmonic distortion
(1kHz, 6.0dBv, R
L
= 2.7k
)
Recording volume amplifier
REC-VOL S/N ratio
("A"-WGT filter)
Recording volume amplifier
Output DC offset voltage
(VOL OUT pin)
Recording volume amplifier
REC-VOL balance characteristics 1
(REC-VOL = 5.0V, REC-BAL = 0.0V)
Recording volume amplifier
REC-VOL balance characteristics 2
(REC-VOL = 5.0V, REC-BAL = 5.0V)
Line amplifier
NR mode gain
(NR PB IN = 1kHz, 11.0dBv)
Line amplifier
PASS mode gain
(NR PB IN = 1kHz, 11.0dBv)
Line amplifier
Signal handling
(1kHz, THD = 1%, R
L
= 2.7k
)
REC-VOL = 2.0V, REC-BAL = 2.5V
Input a 1kHz, 10dBv signal to the VOL IN pin and measure the
attenuation of the recording volume amplifier.
REC-VOL = 0.0V, REC-BAL = 2.5V
Input a 1kHz, +2dBv signal and measure the maximum volume
attenuation of the recording volume amplifier. (Use a 1kHz BPF.)
REC-VOL = 2.0V, REC-BAL = 2.5V, R
L
= 2.7k
Input a 1kHz signal and set the input level so that the THD is 1%.
(Measure the distortion when the output is +2dBv.)
REC-VOL = 2.0V, REC-BAL = 2.5V, R
L
= 2.7k
Input a 1kHz, 10dBv signal (reference input level) and measure the
distortion. (Measure the distortion as THD + N.)
REC-VOL = 5.0V, REC-BAL = 2.5V
With no signal, measure the noise using an "A"-WGT filter. (The measured
value is indicated as the relative value compared to the full-gain level.)
REC-VOL = 5.0V, REC-BAL = 2.5V
With no signal, measure the DC offset voltage of the VOL OUT pin.
REC-VOL = 5.0V, REC-BAL = 0.0V, (1kHz BPF)
Input a 1kHz, +2dBv signal and measure the attenuation of VOL OUT 1.
(Input a 10dBv signal and confirm that there is no attenuation at VOL OUT 2.)
REC-VOL = 5.0V, REC-BAL = 5.0V, (1kHz BPF)
Input a 1kHz, +2dBv signal and measure the attenuation of VOL OUT 2
.
(Input a 10dBv signal and confirm that there is no attenuation at VOL OUT 1.)
NR mode
Input a 1kHz, 11dBv signal to the NR PB IN pin and measure the gain.
PASS mode
Input a 1kHz, 11dBv signal to the NR PB IN pin and measure the gain.
PASS mode, R
L
= 2.7k
Input a 1kHz signal and set the output level so that the THD is 1%.
(Measure the distortion when the output is +1dBv.)
9.4
--
2.0
--
80
150
--
--
6.0
6.0
12.0
8.4
104.7
3.41
0.09
97.5
4.2
93.2
93.2
7.0
7.0
15.5
7.4
80
--
0.5
--
150
60
60
8.0
8.0
--
dB
dB
dBv
%
dB
mV
dB
dB
dB
dB
dB
Block
Item
Conditions
Min.
Typ.
Max.
Unit
19
CXA1878Q
Line amplifier
Line amplifier
Line amplifier
Line amplifier
Level meter
Level meter
Level meter
Level meter
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
Line amplifier
Line amplifier total harmonic distortion
(1kHz, 11.0dBv, R
L
= 2.7k
)
Line amplifier
Line amplifier S/N ratio
("A"-WGT filter)
Line amplifier
Output DC offset voltage
(LINE OUT pin)
Line amplifier
MUTE mode characteristics
(1kHz BPF)
Level meter amplifier
Level meter characteristics 1
(PASS IN = 1kHz, 11dBv)
Level meter amplifier
Level meter characteristics 2
(PASS IN = 1kHz, 21dBv)
Level meter amplifier
Level meter CAL characteristics
(PASS IN = 1kHz, 28dBv)
Level meter amplifier
Level meter MUTE characteristics
(PASS IN = 1kHz, +1.0dBv)
120
s, DECK-A mode
Playback reference output level
(Playback equalizer amplifier gain)
Playback equalizer amplifier
PB-EQ frequency response 1
120
s-NS, DECK-A mode
Playback equalizer amplifier
PB-EQ frequency response 2
70
s-NS, DECK-A mode
PASS mode, R
L
= 2.7k
Input a 1kHz, 11dBv signal (reference input level) and measure the
distortion. (Measure the distortion as THD + N.)
PASS mode, Rg = 5.1k
With no signal, measure the noise using the "A
"-WGT filter. (The measured
value is indicated as the relative value compared to the reference level.
PASS mode
With no signal, measure the DC offset voltage of the LINE OUT pin.
MUTE mode
Input a 1kHz, +1dBv signal to the NR PB IN pin and measure the
attenuation when LINE MUTE is on. (Use a 1kHz BPF.)
METER ON, CAL OFF, PB
Input a 1kHz, 11dBv signal to the NR PB IN pin and measure the
output DC voltage at the METER pin.
METER ON, CAL OFF, PB
Input a 1kHz, 21dBv (10dB level down) signal to the NR PB IN pin
and measure the output DC voltage at the METER pin.
METER ON, CAL ON, REC
Input a 1kHz, 28dBv (17dB level down) signal to the NR PB IN pin
and measure the output DC voltage at the METER pin.
METER MUTE ON, PB
Input a 1kHz, +1dBv (12dB level up) signal to the NR PB IN pin and
measure the output DC voltage at the METER pin.
DECK-A, A-EQ = 120
s, NORM-speed mode
Input a 315Hz, 31dBv (reference input level) signal to the PB IN pin
and measure the output level.
DECK-A, A-EQ = 120
s, NORM-speed mode
Input a 5kHz, 31dBv (reference input level) signal and then measure
the relative deviation from the 120
s-NS, 315Hz mode.
DECK-A, A-EQ = 70
s, NORM-speed mode
Input a 5kHz, 31dBv (reference input level) signal and then measure
the relative deviation from the 120
s-NS, 315Hz mode.
--
80
200
--
1.34
0.2
1.3
--
11.9
1.0
5.7
0.07
84.1
0
111
1.64
0.5
1.6
3.0
10.9
0.0
4.2
1.0
--
200
80
1.94
0.8
1.9
50.0
9.9
1.0
2.7
%
dB
mV
dB
V
V
V
mV
dBv
dB
dB
Block
Item
Conditions
Min.
Typ.
Max.
Unit
20
CXA1878Q
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
Playback
equalizer amplifier
AMS/BS amplifier
AMS/BS amplifier
AMS/BS amplifier
Playback equalizer amplifier
PB-EQ frequency response 3
120
s-HS, DECK-A mode
Playback equalizer amplifier
PB-EQ frequency response 4
70
s-HS, DECK-A mode
120
s-NS, DECK-A mode
PB-EQ signal handling
(1kHz, THD = 1%, R
L
= 2.7k
)
120
s-NS, DECK-A mode
PB-EQ total harmonic distortion
(1kHz, 0.0dB, R
L
= 2.7k
)
120
s-NS, DECK-A mode
PB-EQ S/N ratio
("A"-WGT filter)
120
s-NS, DECK-A mode
Output DC offset voltage
(PB OUT pin)
Recording equalizer amplifier
DECK-A/B switching
characteristics
120
s-NS, DECK-B mode
AMS/BS amplifier
AMS signal detection level
AMS mode
AMS/BS amplifier
BS signal detection level
BS mode
AMS/BS amplifier
AMS output leak current
(AMS OUT pin)
DECK-A, A-EQ = 120
s, HIGH-speed mode
Input a 5kHz, 31dBv (reference input level) signal and then measure
the relative deviation from the 120
s-NS, 315Hz mode.
DECK-A, A-EQ = 70
s, HIGH-speed mode
Input a 5kHz, 31dBv (reference input level) signal and then measure
the relative deviation from the 120
s-NS, 315Hz mode.
DECK-A, A-EQ = 120
s, NORM-speed mode, R
L
= 2.7k
Input a 1kHz signal and set the output level so that the THD is 1%.
(Measure the distortion of a +12dB level-up signal.)
DECK-A, A-EQ = 120
s, NORM-speed mode, R
L
= 2.7k
Input a 1kHz, 31dBv (reference input level) signal and measure the
distortion. (Measure the distortion as THD + N.)
DECK-A, A-EQ = 120
s, NORM-speed mode, Rg = 5.1k
With no signal, measure the noise using the "A"-WGT filter. (The measured
value is indicated as the relative value compared to the reference level.)
DECK-A, A-EQ = 120
s, NORM-speed mode
With no signal, measure the DC offset voltage of the PB OUT pin.
DECK-B, B-EQ = NORM-tape, NORM-speed mode
Input a 1kHz, 31dBv (reference input level) signal to the DECK-B
side and then measure the relative deviation from the DECK-A, 120
s-NS,
315Hz mode.
AMS mode, fin = 5kHz, reference level 11dBv
Input level when the AMS OUT pin level changes from high to low.
Input the signal to the NR PB IN pin and measure the level at the AMS
OUT pin.
BS mode, fin = 5kHz, reference level 11dBv
Input level when the AMS OUT pin level changes from high to low.
Input the signal to the NR PB IN pin and measure the level at the AMS
OUT pin.
AMS OFF mode
Input a 5kHz, 11dBv signal to the NR PB IN pin and measure the
current flowing to the AMS OUT pin.
6.8
10.1
12
--
70
200
1.0
15.0
35.5
--
5.3
8.6
22
0.03
75.6
5
0.0
10.0
30.5
0.88
3.8
7.1
--
0.5
--
200
1.0
5.0
25.5
1.0
dB
dB
dB
%
dB
mV
dB
dB
dB
A
Block
Item
Conditions
Min.
Typ.
Max.
Unit
21
CXA1878Q
AMS/BS amplifier
BIAS SW
BIAS SW
BIAS SW
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
AMS/BS amplifier
AMS output saturation voltage
(AMS OUT pin)
BIAS N output voltage
(NORMAL mode)
BIAS C output voltage
(CrO
2
mode)
BIAS M output voltage
(METAL mode)
Dolby level
REC mode
REC IN level
REC mode
CAL IN level
PB mode
PB IN level
B type encoding
Boost characteristics 1
B type encoding
Boost characteristics 2
B type encoding
Boost characteristics 3
B type encoding
Boost characteristics 4
AMS mode
Input a 5kHz, 11dBv signal to the NR PB IN pin and measure the
output voltage when a 1mA current flows to the AMS OUT pin.
Input a 2mA signal to the BIAS N pin and measure the DC output
voltage at the BIAS N pin.
Input a 2mA signal to the BIAS C pin and measure the DC output
voltage at the BIAS C pin.
Input a 2mA signal to the BIAS M pin and measure the DC output
voltage at the BIAS M pin.
REC mode, NR OFF
1kHz, assume Dolby level of 6dBm as 0dB.
REC mode, NR OFF, f = 1kHz
Input a signal to the REC IN pin and measure the level at which the
level of the DOLBY OUT pin reaches 6dBm.
REC mode, NR OFF, f = 1kHz
Input a signal to the CAL IN pin and measure the level at which the
level of the DOLBY OUT pin reaches 6dBm.
PB mode, NR OFF, f = 1kHz
Input a signal to the NR PB IN pin and measure the level at which the
level of the DOLBY OUT pin reaches 6dBm.
REC, Dolby B type mode
Input a 500Hz, 25dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby B type mode
Input a 5kHz, 25dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby B type mode
Input a 10kHz, 40dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby B type mode
Input a 10kHz, 0dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
--
--
--
--
--
26
26
11
1.4
3.9
9.7
1.1
0.17
0.4
0.4
0.4
6.0
25
25
10
2.9
5.4
10.4
0.4
1.0
0.6
0.6
0.6
--
24
24
9
4.4
6.9
11.4
1.9
V
V
V
V
dBm
dBm
dBm
dBm
dB
dB
dB
dB
Block
Item
Conditions
Min.
Typ.
Max.
Unit
22
CXA1878Q
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
C type encoding
Boost characteristics 1
C type encoding
Boost characteristics 2
C type encoding
Boost characteristics 3
C type encoding
Boost characteristics 4
C type encoding
Boost characteristics 5
C type encoding
Boost characteristics 6
PB mode
Frequency response
REC mode
Signal handling
NR OFF total harmonic
distortion
Dolby B type total harmonic
distortion
Dolby C type total harmonic
distortion
REC, Dolby C type mode
Input a 500Hz, 60dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby C type mode
Input a 500Hz, 25dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby C type mode
Input a 2kHz, 60dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby C type mode
Input a 2kHz, 25dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby C type mode
Input a 5kHz, 25dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
REC, Dolby C type mode
Input a 10kHz, 0dB signal from the REC IN pin and measure the
boost at the REC OUT pin.
PB, Dolby C type mode
Input a 20kHz, 10dBm signal from the NR PB IN pin and measure
the relative deviation from the REC OUT output NR OFF mode.
REC, NR OFF mode
Input a 1kHz signal and set the output level so that the THD is 1%.
(Measure the distortion using a +13.5dB level-up signal from the reference.)
REC, NR OFF mode
Input a 1kHz, +10dB signal from the REC IN pin and measure the
distortion. (Measure the distortion as THD + N.)
REC, Dolby B type mode
Input a 1kHz, +10dB signal from the REC IN pin and measure the
distortion. (Measure the distortion as THD + N.)
REC, Dolby C type mode
Input a 1kHz, +10dB signal from the REC IN pin and measure the
distortion. (Measure the distortion as THD + N.)
14.2
7.2
18.7
5.4
3.5
5.5
1.5
13.5
--
--
--
16.2
9.2
20.7
7.4
5.5
3.5
0
15.4
0.04
0.06
0.09
18.2
11.2
22.7
9.4
7.5
1.5
1.5
--
0.5
0.5
0.5
dB
dB
dB
dB
dB
dB
dB
dB
%
%
%
Block
Item
Conditions
Min.
Typ.
Max.
Unit
23
CXA1878Q
DOLBY
DOLBY
DOLBY
DOLBY
Control circuit
Control circuit
Control circuit
Control circuit
Control circuit
REC mode
Dolby C type S/N ratio
PB mode
Recording
playback
crosstalk
REC mode
Playback
recording
crosstalk
REC mode
Output DC offset voltage
(REC OUT pin)
Mode control
Control circuit high level
Mode control
Control circuit medium level
Mode control
Control circuit low level
Mode control
Control circuit high level
Mode control
Control circuit low level
REC, Dolby C type mode, Rg = 5.1k
With no signal, measure the noise using the CCIR/ARM filter.
(The measured value is indicated as the relative value compared to the
DOLBY OUT level.)
PB, NR OFF mode
Input a 1kHz, +10dB signal from the REC IN pin and measure the
REC
PB crosstalk. (Use a 1kHz BPF.)
REC, NR OFF mode
Input a 1kHz, +10dB signal from the NR PB IN pin and measure the
PB
REC crosstalk. (Use a 1kHz BPF.)
REC mode, NR OFF
C type
With no signal, measure the deviation in the output DC offset voltage at
the REC OUT pin when switching from NR OFF mode to C type mode.
NR SW, S SW, DECK A/B, EQ, B EQ, and PASS SW pin voltages
NR SW, S SW, DECK A/B, EQ, B EQ, and PASS SW pin voltages
NR SW, S SW, DECK A/B, EQ, B EQ, and PASS SW pin voltages
AMS SW, MODE SW, SPEED, and METER SW pin voltages
AMS SW, MODE SW, SPEED, and METER SW pin voltages
60.0
--
--
100
4.2
2.2
0.0
3.5
0.0
61.0
77.5
113
0.0
--
--
--
--
--
--
70
70
100
V
CC
2.8
0.5
V
CC
0.5
dB
dB
dB
mV
V
V
V
V
V
Ternary switching
Binary swithing
Block
Item
Conditions
Min.
Typ.
Max.
Unit
24
CXA1878Q
C4
200p
R11
18k
A DECK
B DECK
B EQ (N/C/M)
A EQ (120/70)
DECK A/B (A/B)
SPEED (NS/HS)
REC MUTE
REC VOL
REC BAL
METER SW (ON/MUTE)
PASS SW (NR/MUTE/PASS)
NR SW (OFF/B/C)
MODE SW (REC/PB)
AMS SW (OFF/AMS/BS)
S SW (S/BC/CAL)
CONTROL
to Control IC
VOL IN
GND
DVcc
R1
50k
R2
50k
to LINE IN
GND
OSC
6dBv
600
10k
Sourse Impedance 10k
10dBv
R12
6.5k
10dBv
VGS
(C)
VGS
(B)
1
Gm1
RVA
R13
6.5k
R15
3.3k
14dBv
GND
R20
2k
R18
6.2k
C6
2.2
VOL OUT
NR
RECIN
CAL IN
10dBv
MOA
GND (VG)
Vcc
Vcc
V
EE
V
EE
DV
CC
GND
GND
IREF (REC/PB)
DVcc
DGND
NR IREF
C3
2.2
R6 27k
R5 20k
BIAS
VGS
(C)
26dBv
VGS
(C)
VGS
(C)
VGS
(C)
R19
4k
R16
36k
(30dBm)
31dBv
for R-ch
R17
40k
R21
10k
26dBv
(25dBm)
ON
OFF
REC
PB
C8
R23
(6dBm)
REC & CAL
PB
REC/PB
VGS
(C)
R25
1.5k
R26
12k
R24
22.5k
R22
1.5k
VGS
(C)
NR OUT
DOLBY S NR
S IN
(6dBm)
VGS
(C)
R31
40k
PEA
Gmb
VGS
(C)
R10
2k
C5
2.2
GND
(A)
GND
11dBv
11dBv
VGS
(C)
R8
50k
R9
50k
31dBv
C2
2.2
C1
2.2
R14
30k
11dBv
PRE
D1
PB INA
PB INB
31dBv
PB Amp
1
SUM
AMS
S SW
CAL
S-NR
B/C-NR
BC/S/CAL
7dBv
(6dBm)
7dBv
R27
40k
(10dBm)
11dBv
PB Only HEAD
[DECK-A]
11dBv
R23
40k
R28
12.5k
R29
100k
15dBv
VGS
(B)
for R-ch
V
EE
R32
100k
PB OUT
NRPB IN
NR TCH
NR TCL
AMS FB
BS FB
V
EE
C7
0.1
C8
0.068
GND
1
C10
106p
R30
10k
C9
0.015
GND
R33
1k
C11
1.5
15dBv
26dBv
15dBv
AMS TC
LINE OUT
MT C
METER
COMP
MTR
LINE
DGND
Q
DGND
DET
R44
3.3k
VGS
(C)
NR/PASS/MUTE
4dBv
R42
2.9k
R39
5k
R46
2k
R47
12k
METER
VGS
(C)
VGS
(B)
CAL
OFF
ON
METER
NR
PASS
OFF
ON
7dBv
(6dBm)
OFF
ON
OFF
ON
METER
CAL
MUTE
VGS
(B)
NR/PASS
/MUTE
(6dBm)
7dBv
GND
R54
14k
R58
36k
R59
10k
DGND
R62
150
R60
10k
+1.1dBv (1.6V)
V
EE
Q
Q
Q
NR
PASS
MUTE
B EQ
METAL
CrO
2
NORM
Vcc
REC
Gm5
VGS
(C)
R35
4.7k
R43
2.5k
C12
2.2
GND
GND
for R-ch
R-ch
L-ch
LINE OUT
from LINE OUT
VM
6dBv
Load Impedance 47k
R45
12k
HP Amp
R48
100k
NR
RECOUT
R34
8.2k
GND
REC IN
GND
C14
2.2
R37
10k
C13
0.47
Gm2
1
R57
40k
R41
20k
R40
15k
REA
VGS
(B)
REC OUT
R63
50k
R38
50k
C17
200p
7dBv
7dBv
0.5dBv
24dBv
3dBv
C20
100p
GND (A)
VGS
(C)
6dBv
R52
20k
R51
20k
VGS
(C)
C19
100p
VGS
(C)
+6dBv
6dBv
Gm4
Gm3
1
1
BPF
GND
(A)
GND (A)
R53
8k
R56
24k
CALIBRATION
GND
DVcc
R67
50k
REC CAL
GP CAL
R65
50k
BIAS-N
BIAS-C
BIAS-M
AMS OUT
DVcc
R64
100k
to AMS Control
4dBv
to METER IC
GND
R61
56k
GND
C21
3.3
R36
1MEG
C15
0.1
DVcc
6dBv
C16
4.7
GND
C18
1.0
R50
4.7k
GND
R55
220
GND
for R-ch
HEADPHONES
R66
12k
C24
75p
GND
GND
C23
150p
C22
3.3
L1
27mH
PB
REC
REC/PB
REC/PB HEAD
[DECK-B]
Bias
OSC
PB Amp
BIAS
CONTROL
GND
47k
MPX
Filter
Dolby B/C-NR
ANTS
SSK
HLS VF
LLS VF
11dBv
AMS/BS
BS
AMS
V
EE
V
EE
V
EE
DVcc
V
EE
V
EE
R49
10k
GND
GND
for R-ch
R-ch
L-ch
LINE IN
R4
15k
R3
180k
R7
50k
GND
Description of Operation
The CXA1878Q is a Dolby B-C type NR system with a built-in recording/playback equalizer amplifier,
electronic volume, AMS, BIAS SW, and meter circuit. In addition, this chip also contains an S type
(CXA1417S/Q) select switch, enabling the construction of a 2-channel Dolby B-C-S type NR system by using
the CXA1878Q together with two CXA1417S/Q encoder units.
The CXA1878Q has the circuit configuration shown in Fig. 1.
Fig. 1. Functional block diagram
25
CXA1878Q
1. Reference levels
(1) Recording equalizer amplifier output level (315Hz, 3dBv)
[
when the recording equalizer amplifier input level is 24dBv]
(2) Playback equalizer amplifier output level (315Hz, 11dBv)
[
when the playback equalizer amplifier input level is 31dBv]
(3) Dolby
The Dolby level is measured at the recording output pin (REC OUT) at 6dBm (388mVrms) in the NR OFF
mode. Reference levels for the recording input pin (LINE IN), playback input pin (PB IN) and line output
pin (LINE OUT) are defined as the levels which apply the Dolby level to REC OUT in the NR OFF mode.
2. System control methods
(1) Mode settings table
The NR SW (Pin 34) operates only when the NR S SW (Pin 35) is set to medium.
(2) Mode setting pin control voltage
Pin No.
Symbol
Pin voltage
Low
Medium
High
Remarks
34
35
16
20
19
25
23
24
17
18
NR SW
NR S SW
AMS SW
MODE SW
SPEED
DECK A/B
A EQ
B EQ
PASS SW
METER SW
DOLBY NR OFF
DOLBY S
AMS OFF
PB
NORMAL SPEED
PB IN A
PB IN A EQ FLAT
PB IN B EQ FLAT
REC EQ NORMAL
BIAS SW
NORMAL
DOLBY NR
METER ON
DOLBY NR ON
B type
DOLBY B-C
AMS MODE
--
--
--
--
PB IN B EQ 70
REC EQ CrO
2
BIAS SW
CrO
2
MUTE
--
DOLBY NR ON
C type
CALIBRATION
BS MODE
REC
HIGH SPEED
PB IN B
PB IN A EQ 70
PB IN B EQ 70
REC EQ METAL
BIAS SW
METAL
PASS
METER OFF
3-state
3-state
3-state
2-state
2-state
2-state
2-state
3-state
3-state
2-state
Note: When 3-state input pins are open, the pin voltage is medium.
Control voltage
High level
Medium level
Low level
High level
Low level
4.2
2.2
0.0
3.5
0.0
V
CC
2.8
0.5
V
CC
0.5
3-state
2-state
Min.
Max.
26
CXA1878Q
3. Recording mute function
The CXA1878Q recording mute function is implemented by using a built-in recording mute circuit which varies the
recording equalizer amplifier gain according to the magnitude of the DC voltage applied to the REC MUTE pin
just like an electronic volume control. Also, any desired soft mute or fader can be freely set depending on
momentary changes in the DC voltage applied to the REC MUTE pin. Fig. 2 illustrates the recording mute
waveforms.
1
Although the above range of voltages can be input to the control pin, the controllable input voltage range is
as follows.
2.5V < Vup
5.0V
DGND
Vdown < 2.5V
2
Control voltages for this IC are referenced to the DGND pin (Pin 30).
Also note that when not using this recording level calibration function, simply leave the REC CAL pin (Pin 33)
open, so that the voltage of the REC CAL pin is matched to the internal reference voltage (2.5V), with the
recording level set for the standard gain.
Pin No.
Symbol
42
REC MUTE
Pin voltage (V)
Remarks
RECOUT attenuation (dB)
NORM Tape, Norm-Speed, f = 1kHz
Decrease <<<< Increase
0.0
0.5
2.5
4.5
5.0
Less
than 90
90
--
--
--
4. Recording level calibration
The CXA1878Q allows the recording level to be finely adjusted with a DC voltage.
Therefore, the recording level can be varied by approximately 6dB simply by applying DC voltages of 0 to 5V
(for dual power supply) to the REC CAL pin (Pin 33).
The table below shows the input range of control voltages with the power supplies used.
1
Output level
REC CAL pin voltage
Down (Vdown)
DGND to 2.5V
Typ.
2.5V
2
Up (Vup)
2.5V to V
CC
Fig. 2. Recording mute waveform
REC MUTE control voltage
27
CXA1878Q
5. High frequency calibration
The CXA1878Q allows the high frequency response of the recording equalizer to be finely adjusted with a DC
voltage.
Therefore, the recording level in high frequencies (peak) can be varied by approximately 4dB simply by
applying DC voltages of 0 to 5V (for dual power supply) to the GP CAL pin (Pin 32). The table below shows
the input range of control voltages with the power supplies used.
3
Gain
[dB]
REC CAL
REC CAL
REC CAL
REC CAL
REC CAL
REC CAL
GP CAL
GP CAL
GP CAL
Frequency [Hz]
Output level
GP CAL pin voltage
Down (Vdown)
DGND to 2.5V
Typ.
2.5V
4
Up (Vup)
2.5V to V
CC
3
Although the above range of voltages can be input to the control pin, the controllable input voltage range is
as follows.
2.5V < Vup
5.0V
DGND
Vdown < 2.5V
4
Control voltages for this IC are referenced to the DGND pin (Pin 30).
Also note that when not using this high frequency calibration function, simply leave the GP CAL pin (Pin 32)
open, so that the voltage of the GP CAL pin is matched to the internal reference voltage (2.5V), with the
high frequency equalizer amplifier characteristics set for the standard gain.
Fig. 3. Conceptual diagram of the recording level/high frequency calibration functions
6. Meter circuit
The CXA1878Q has a built-in full-wave rectifier circuit for the level meter. Therefore, a DC voltage can be
obtained by attaching time constants to the METER 1 and 2 output pins. The output voltage is set to 1.6V
(+1.1dBv) during reference input. (for an external time constant of 56k
, 33F)
The MT C pin detects only the AC component. The low frequency cut-off is determined with the capacitor
connected to this pin and the 14k
internal resistor. (Approximately 10Hz for 1F)
7. Recording volume control circuit
The CXA1878Q adjusts the size of the recording signal with a built-in control circuit. Therefore, the gain can be
controlled by applying the voltage between DV
CC
and DGND to the REC VOL pin (Pin 28).
(A 0dB signal is output when voltage of 2.0V is applied.)
28
CXA1878Q
8. Recording volume balance circuit
The CXA1878Q contains a circuit which controls the balance between channels 1 and 2 of the recording
volume.
Therefore, the balance between channels 1 and 2 can be controlled by applying the voltage between DV
CC
and DGND to the REC BAL pin (Pin 29).
(Signals which are not attenuated by the balance circuit are output from both channels when this control pin is
open or when a voltage of DV
CC
/2 is applied.)
REC VOL Control Voltage
Pin No.
Symbol
28
REC VOL
Pin voltage (V)
Remarks
VOLOUT1 and 2 attenuation (dB)
BALANCE = 2.5V, f = 1kHz
Decrease <<<< Increase
0.0
0.5
2.0
4.5
5.0
Less
than 96
96
0.0
--
9.0
Pin No.
Symbol
29
REC BAL
Pin voltage (V)
Remarks
VOLOUT2 attenuation (dB)
REC VOL = 5V, f = 1kHz
VOLOUT1 attenuation (dB)
REC VOL = 5V, f = 1kHz
Increase >>>> Decrease
0.0
0.5
2.5
4.5
5.0
0.0
0.0
0.0
93
Less
than 93
Decrease <<<< Increase
Less
than 93
93
0.0
0.0
0.0
BALANC control voltage
9. Bias OSC power supply control circuit
The CXA1878Q contains a switch circuit that selects the supply voltage for the bias oscillator.
The supply voltage can be controlled with the B EQ pin (Pin 24). The maximum output current is 2mA.
29
CXA1878Q
10. AMS circuit
The CXA1878Q has the music sensor circuit.
COMP
NR PBIN1
NR PBIN2
0dB
0dB
16kHz
LPF
WINDOW
COMP
OP AMP
100k
1k
AMS TC
AMS OUT
C3
R3
DV
CC
G1
R1
C1
G2
R2
C2
[
1]
[
1]
[
2]
[
2]
54
62
36
37
The broken line shows the case
detection level has changed.
WINDOW COMP
detection level
(sensitivity)
AMS OUT
AMS ON
AMS TC pin voltage after integration
COMP detection level
Fig. 4. AMS circuit block diagram
(1) AMS ON operation
The signal input from PB NR IN first passes through the LPF, then through the HPF/sensitivity setting
amplifier, and then through the WINDOW comparator where it is formed into a pulse wave. (See Fig. 5)
This signal which has been formed into a pulse wave is integrated by a capacitor connected to the AMS TC
pin (Pin 37) and then input to the comparator. (See Fig. 6)
AMS OUT turns ON when the AMS TC pin voltage falls below the comparator threshold value.
(When the sensitivity changes, the pulse width also changes.)
Fig. 5. Conceptual diagram of WINDOW comparator operation
Fig. 6. Conceptual diagram of AMS OUT operation
30
CXA1878Q
(2) AMS OFF operation
When the input signal disappears, the capacitance connected to the AMS TC pin (Pin 37) is discharged,
causing the TC pin voltage to rise above the threshold value and turn AMS OFF.
(3) AMS gain setting method
The AMS gain (G1/G2 mode gain) adjustment can be determined by external resistances R1 and R2.
In addition, AMS gain is expressed by the following equations.
G1 = 20 log
R1 + 100k
(internal resistance)
dB
R1
G2 = 20 log
R2 + 100k
(internal resistance)
dB
R2
dB
G1 NOR (BS)
G2 FF (AMS)
[
2]
[
2]
[
1]
[
1]
Frequency
(4) AMS low frequency cut-off setting method
The AMS low frequency cut-off adjustment can be determined by external resistances R1 and R2 and
capacitances C1 and C2.
(5) Relationship between response time and sensitivity
The AMS ON time is determined by the width of the pulse obtained by applying the input signal to the
WINDOW comparator. The pulse emitted from the WINDOW comparator becomes extremely small near
the detection level, and some time is required for this pulse to be integrated by the external capacitance,
thus lengthening the response time.
Response times can be adjusted to approximately the same value by adjusting the AMS sensitivity with
resistances R1 and R2 to match the various ICs. Also, the AMS OFF time is determined by the external
time constant (R3, C3).
Notes on Operation
Temperature characteristics and accuracy of the recording equalizer amplifier
The temperature characteristics of the built-in monolithic filter and the filter cut-off frequency depend on the
27k
external resistance connected to the IREF pin (Pin 10). Also, the recording equalizer amplifier
frequency response depends on unevenness in the absolute, as well as relative values of the internal
capacitance. Furthermore, the high frequency response indicates a high element sensitivity at the filter
because the band-pass filter Q is high. Compared to low frequency, although the unevenness inherent in
the IC is more likely to occur, this occurs relatively, and not individually for channels 1 and 2.
31
CXA1878Q
Example of Representative Characteristics
2.0
6
4
2
0
2
4
6
8
1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
315Hz
8kHz
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM
GP CAL pin = Open
0dB = REC CAL and
GP CAL pin = Open
20dB (at 315Hz,3dBv)
Output level vs. REC CAL pin voltage
Output level [dB]
REC CAL pin voltage [V]
10.0
100
1k
10k
100k
0.0
10.0
20.0
30.0
40.0
REC CAL = 5.0V
REC CAL = 2.5V
REC CAL = 0.0V
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
0dB = NORM - NORM, 315Hz, 23dBv (Output reference)
REC CAL and GP CAL = Open
GP = 5.0V
2.5V
0.0V
REC CAL and GP CAL frequency response
Output response [dB]
Frequency [Hz]
10.0
100
1k
10k
100k
0.0
10.0
20.0
30.0
V
CC
, V
EE
= 7.0V
0dB = NORM - NORM, 315Hz, 23dBv (Output reference)
(Tape) (Speed)
NORM - HIGH
CrO
2
- HIGH
METAL - HIGH
Recording equalizer amplifier frequency response
(HIGH SPEED)
Frequency [Hz]
Output response [dB]
2.0
6
4
2
0
2
4
6
8
1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
315Hz
3kHz
8kHz
12kHz
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM REC CAL pin = Open
0dB = REC CAL pin and GP CAL pin = Open
20dB (at 315Hz,3dBv)
Output level vs. GP CAL pin voltage
Output level [dB]
GP CAL pin voltage [V]
10.0
100
1k
10k
100k
0.0
10.0
20.0
30.0
Recording equalizer amplifier frequency response
(NORMAL SPEED)
Output response [dB]
Frequency [Hz]
V
CC
, V
EE
= 7.0V
0dB = NORM - NORM, 315Hz, 23dBv (Output reference)
(Tape) (Speed)
NORM - NORM
CrO
2
- NORM
METAL - NORM
32
CXA1878Q
80
60
40
20
0.2
0.5
1.0
2.0
0
5.0
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM,
0dB = 1kHz, +12dB
(at 315Hz, 3dBv)
f = 1kHz
Output level vs. REC MUTE pin voltage 2
Output level [dB]
REC MUTE pin voltage [V]
100
80
60
40
0.0 1.0 2.0 3.0
20
4.0 5.0 6.0
0
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM,
0dB = 1kHz, +12dB
(at 315Hz, 3dBv)
f = 1kHz
Output level vs. REC MUTE pin voltage 3
Output level [dB]
REC MUTE pin voltage [V]
80
60
40
20
0.2
0.5
1.0
2.0
0
5.0
70
50
30
10
V
CC
, V
EE
= 7.0V
DV
CC
= +5.0V
Input : VOLUME IN = 10dBv, f = 1kHz
REC BAL pin voltage = 2.5V
Recording volume characteristics
Volume output [dB]
REC LEVEL pin voltage [V]
Recording volume balance characteristics
100
80
60
40
0.0
1.0
2.0
3.0
20
4.0
5.0
0
90
70
50
30
10
V
CC
, V
EE
= 7.0V
DV
CC
= +5.0V
Input : VOLUME IN = 10dBv,
f = 1kHz
REC VOL pin voltage = +5.0V
1CH
2CH
Recording volume output level [dB]
Balance control pin voltage [V]
0
100
1k
10k
100k
5
10
15
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM,
0dB = 3dBv (REC OUT pin)
THD + N = 1%
315Hz
1kHz
Maximum output level (dB)
Load resistance R
L
[W]
Recording equalizer amplifier load characteristics
0
20
40
60
0.0 1.0 2.0
3.0
80
4.0 5.0
6.0
100
Output level vs. REC MUTE pin voltage 1
Output level [%]
REC MUTE pin voltage [V]
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE: NORM - NORM,
0dB = 1kHz, +12dB
(at 315Hz, 3dBv)
f = 1kHz
33
CXA1878Q
100
1k
10k
100k
0.0
2.0
4.0
6.0
8.0
10.0
V
CC
, V
EE
= 7.0V
0dB = 11dBv (NR PB IN)
PASS mode
10.0
1.0
0.1
0.01
16 12 8
4
0
4
8
12
16
V
CC
, V
EE
= 7.0V
MODE = PASS MODE
0dB = 4dBv (LINE OUT)
100Hz
1kHz
10kHz
25.0
21.0
17.0
13.0
9.0
5.0
100
1k
10k
100k
35s
60s
70s
120s
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
0dB = NORM - NORM, 315Hz, 31dBv
(input reference)
Playback equalizer amplifier frequency response
Output response [dB]
Frequency [Hz]
T.H.D + N [%]
10
1.0
0.1
0.01
40
30
20
10
V
CC
, V
EE
= 7.0V
(Tape) (Speed)
MODE = NORM - NORM
100Hz
1kHz
10kHz
Playback equalizer amplifier distortion
Input level [dBv]
Line amplifier frequency response (PASS mode)
Output response [dB]
Frequency [Hz]
Line amplifier THD + N
Output level [dB]
Meter rectification output characteristics
Rectification voltage [V]
Frequency [Hz]
100
1
0.1
20
1k
10k
+10dB
0dB
10dB
20dB
40dB
30dB
V
CC
, V
EE
= 7.0V
0dB = 7dBv (NR REC OUT)
+13dB
Level meter output characteristics (REC, PB mode)
Meter output voltage [V]
Input level [dB]
1.0
60
40
20
0
0.01
5.0
0.1
V
CC
, V
EE
= 7.0V
DV
CC
= +5.0V
PB mode:
0dB = 4dBv
(LINE OUT)
REC mode:
0dB = 7dBv
(NR REC OUT)
f = 1kHz
34
CXA1878Q
20
10
0
10
20
30
10k
100
1k
V
CC
, V
EE
= 7.0V
0dB = 11dBv
AMS mode
BS mode
34
35
36
37
38
5.0
6.0
7.0
8.0
0
0.5
1.0
1.5
2.0
7.0
6.9
6.8
6.7
6.6
6.5
6.4
BIAS N
BIAS C
BIAS M
V
CC
, V
EE
= 7.0V
A.M.S/B.S mode frequency response
Input level [dB]
Frequency [Hz]
BIAS SW load characteristics
Output voltage [V]
Output current [mA]
Supply voltage vs. Current consumption
Current consumption [mA]
Supply voltage [V]
35
CXA1878Q
Dolby B type NR encode boost
100
Frequency [Hz]
10
8
6
4
2
0
2
1k
10k
Encode Boost [dB]
V
CC
, V
EE
= 7V
Dolby Level 400Hz, 6dBm
40dB
35dB
30dB
25dB
20dB
15dB
10dB
Frequency [Hz]
12
8
4
0
4
100
1k
10k
Encode Boost [dB]
V
CC
, V
EE
= 7V
Dolby Level 400Hz, 6dBm
60dB
55dB
35dB
30dB
25dB
20dB
15dB
10dB
5dB
40dB
45dB
50dB
20
16
Dolby C type NR encode boost
0dB (Dolby Level)
5dB
0dB (Dolby Level)
T.H.D + N [%]
1
0.1
0.01
Output level [dB]
4
0
4
8
12
16
20
V
CC
, V
EE
= 7.0V
0dB = 6dBm (NR REC OUT, NR OFF)
Encode Mode
100Hz
1kHz
10kHz
Dolby NR OFF total harmonic distortion
4
0
4
8
12
16
20
0.01
0.1
1
Output level [dB]
T.H.D + N [%]
V
CC
, V
EE
= 7.0V
0dB = 6dBm (NR REC OUT, NR OFF)
Encode Mode
100Hz
1kHz
10kHz
Dolby B type NR total harmonic distortion
0.1
0.01
T.H.D + N [%]
1
4
0
4
8
12
16
20
Output level [dB]
V
CC
, V
EE
= 7.0V
0dB = 6dBm (NR REC OUT, NR OFF)
Encode Mode
Dolby C type NR total harmonic distortion
100Hz
1kHz
10kHz
36
CXA1878Q
Package Outline
Unit: mm
SONY CODE
EIAJ CODE
JEDEC CODE
23.9 0.4
20.0 0.1
0.4 0.1
+ 0.15
14.
0
0.
1
1
19
20
32
33
51
52
64
0.15 0.05
+ 0.1
2.75 0.15
16.
3
0.1 0.05
+ 0.2
0.
8
0.
2
M
0.12
0.15
+ 0.4
17.9
0.4
+
0.
4
+ 0.35
64PIN QFP(PLASTIC)
QFP64PL01
QFP064P1420
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER/PALLADIUM
42/COPPER ALLOY
PACKAGE STRUCTURE
PLATING
1.5g
1.0
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