Description
The CXA1646Q/CXA1767Q is a serial control
electronic volume IC for car stereos.
Features
Loudness
Volume control
(1dB-step from 0dB to 87dB,
dB)
Balance
Tone control
(2dB-step 2 band from 14dB to +14dB)
Fader
(2dB-step to 20dB, 25dB, 35dB, 45dB, 60dB,
dB)
Input selector (4 channels)
Serial data control (DATA, CLK, CE)
Single 8V power supply
Zero-cross detection circuit
Structure
Bipolar IC
Absolute Maximum Ratings (Ta = 25C)
Supply voltage
V
CC
13
V
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
350
mW (Ta = 85C, 1646Q)
240
mW (Ta = 85C, 1767Q)
Recommended Operating Condition
Supply voltage
V
CC
6 to 12
V
1
CXA1646Q/CXA1767Q
E92759D7Y
Electronic Volume
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.
CXA1646Q
48 pin QFP (Plastic)
CXA1767Q
40 pin QFP (Plastic)
2
CXA1646Q/CXA1767Q
Block Diagram and Pin Configuration
CXA1646Q
N
C
L
D
L
C
1
L
D
H
C
1
I
N
A
O
1
V
R
I
N
1
T
C
H
C
1
T
C
L
C
1
1
T
C
L
C
1
2
T
C
O
1
F
D
I
N
1
F
N
T
O
1
N
C
N
C
L
D
L
C
2
L
D
H
C
2
I
N
A
O
2
V
R
I
N
2
T
C
H
C
2
T
C
L
C
2
1
T
C
L
C
2
2
T
C
O
2
F
D
I
N
2
F
N
T
O
2
N
C
GAIN1
IN14
IN13
IN12
IN11
NC
NC
IN21
IN22
IN23
IN24
GAIN2
REO1
CE
TEST
CLK
GND
NC
NC
V
CC
VCT
DATA
INIT
REO2
VCTBUFF
VCTBUFF
SHIFT REGISTER
LATCH
LATCH CONTROL
VOLUME
8dB STEP
VOLUME
1dB STEP
TONE
I
N
P
U
T
S
W
FADER
VCTBUFF
VCTBUFF
LOUD
ZCDET
I
N
P
U
T
S
W
LOUD
8dB STEP
VOLUME
1dB STEP
VOLUME
TONE
FADER
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
36
35
34
31
32
33
40
39
38
37
41
42
43
44
45
46
47
48
2
3
4
5
6
7
8
9
10
11
12
1
3
CXA1646Q/CXA1767Q
CXA1767Q
L
D
L
C
1
L
D
H
C
1
I
N
A
O
1
V
R
I
N
1
T
C
H
C
1
T
C
L
C
1
1
T
C
L
C
1
2
T
C
O
1
F
D
I
N
1
F
N
T
O
1
L
D
L
C
2
L
D
H
C
2
I
N
A
O
2
V
R
I
N
2
T
C
H
C
2
T
C
L
C
2
1
T
C
L
C
2
2
T
C
O
2
F
D
I
N
2
F
N
T
O
2
GAIN1
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
GAIN2
REO1
CE
TEST
CLK
GND
V
CC
VCT
DATA
INIT
REO2
VCTBUFF
VCTBUFF
SHIFT REGISTER
LATCH
LATCH CONTROL
VOLUME
8dB STEP
VOLUME
1dB STEP
TONE
I
N
P
U
T
S
W
FADER
VCTBUFF
VCTBUFF
LOUD
ZCDET
I
N
P
U
T
S
W
LOUD
8dB STEP
VOLUME
1dB STEP
VOLUME
TONE
FADER
21
22
23
24
25
26
27
28
29
30
36
35
34
31
32
33
40
39
38
37
13
14
15
16
17
18
19
20
11
12
2
3
4
5
6
7
8
9
10
1
4
CXA1646Q/CXA1767Q
Pin Description (Pin No. in the parenthesis is for CXA1767Q.)
Pin No.
2 (1)
35 (30)
LDLC2
LDLC1
5.28k
VCT
Symbol
Sets loudness low
cut-off frequency.
I/O resistance
Pin voltage
Equivalent circuit
Description
Vcc
GND
3 (2)
34 (29)
LDHC2
LDHC1
7.97k
VCT
Sets loudness high
cut-off frequency.
Vcc
GND
4 (3)
33 (28)
INAO2
INAO1
--
VCT
Input selector output
Vcc
GND
5 (4)
32 (27)
VRIN2
VRIN1
50k
VCT
Volume input
Vcc
GND
5
CXA1646Q/CXA1767Q
Pin No.
6 (5)
31 (26)
TCHC2
TCHC1
5k
VCT
Symbol
Sets tone high
frequency.
I/O resistance
Pin voltage
Equivalent circuit
Description
Vcc
GND
7 (6)
30 (25)
TCLC21
TCLC11
8k
VCT
Sets tone low
frequency.
Vcc
GND
8 (7)
29 (24)
TCLC22
TCLC12
8k
VCT
Sets tone low
frequency.
Vcc
GND
9 (8)
28 (23)
TCO2
TCO1
--
VCT
Tone control output
Vcc
GND
6
CXA1646Q/CXA1767Q
Pin No.
10 (9)
27 (22)
FDIN2
FDIN1
24k
VCT
Symbol
Fader input
I/O resistance
Pin voltage
Equivalent circuit
Description
Vcc
GND
11 (10)
26 (21)
FNTO2
FNTO1
--
VCT
Front output
Vcc
GND
13 (11)
24 (20)
REO2
REO1
--
VCT
Rear output
Vcc
GND
14 (12)
INIT
--
--
System reset
Vcc
GND
7
CXA1646Q/CXA1767Q
Pin No.
15 (13)
DATA
--
Symbol
Serial data input
16 (14)
VCT
--
VCT
1
2
V
CC
17 (15)
V
CC
V
CC
+power supply
20 (16)
GND
GND
GND
I/O resistance
Pin voltage
Equivalent circuit
Description
Vcc
GND
21 (17)
CLK
Serial clock
Vcc
GND
23 (19)
CE
Latch enable
Vcc
GND
22 (18)
TEST
--
--
Test. Leave open.
--
--
~
~
~
8
CXA1646Q/CXA1767Q
Pin No.
37 (31)
48 (40)
GAIN1
GAIN2
10k
VCT
Symbol
Sets input amplifier
gain to 6dB by
connecting to VCT.
0dB at open.
I/O resistance
Pin voltage
Equivalent circuit
Description
Vcc
GND
10k
10k
38 (32)
39 (33)
40 (34)
41 (35)
44 (36)
45 (37)
46 (38)
47 (39)
Mode
Set value
INPUT
VRC1
VRF1
VRC2
VRF2
LOUD
TONE BASS
TONE TREBLE
FADER
1
7dB
7dB
OFF
0dB
0dB
0dB, REAR
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
50k
VCT
Signal input
Vcc
GND
Reset
Reset is performed by lowering the INIT pin below 1V when CLK is High. Reset is disabled when CLK is Low.
The following table shows the reset status.
9
CXA1646Q/CXA1767Q
Data Format
(a) Data allocation
FAST BIT
MSB
LAST BIT
LSB
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
D32
NOP
ISW
LOUD
VRC1
VRF1
VRC2
VRF2
TONE BASS
TONE TREBLE
FADER
FADER SELECT
10
CXA1646Q/CXA1767Q
(b) Set table
NOP
Set value
--
0
D1
0
D2
ISW
Set value
IN14/IN24
IN13/IN23
IN12/IN22
IN11/IN21
1
1
0
0
D1
1
0
1
0
D2
LOUD
Set value
ON
OFF
1
0
D5
VRC1/VRC2
Set value
O
8
16
24
32
40
48
56
64
72
80
1
1
1
1
1
1
1
1
0
0
0
0
0
D6/D13
1
1
1
1
0
0
0
0
1
1
1
1
0
D7/D14
1
1
0
0
1
1
0
0
1
1
0
0
0
D8/D15
1
0
1
0
1
0
1
0
1
0
1
0
0
D9/D16
VRF1/VRF2
Set value
O
1
2
3
4
5
6
7
1
1
1
1
0
0
0
0
D10/D17
1
1
0
0
1
1
0
0
D11/D18
1
0
1
0
1
0
1
0
D12/D19
11
CXA1646Q/CXA1767Q
TONE BASS/TREBLE
Set value
14
12
10
8
6
4
2
0
1
1
1
1
0
0
0
0
D20/D24
1
1
0
0
1
1
0
0
D21/D25
1
0
1
0
1
0
1
0
D22/D26
BOOST/CUT
Set value
BOOST
CUT
1
0
D23/D27
FADER SELECT
Set value
Attenuation of front signal
Attenuation of rear signal
1
0
D32
FADER
Set value
60
45
35
25
20
18
16
14
12
10
8
6
4
2
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D28
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D29
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D30
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
D31
12
CXA1646Q/CXA1767Q
DATA TIMING
min 0.5s
max 1MHz
min 0.5s
CE
DATA
CLK
CE
min 4s
D1
D2
D3
D31
D32
13
CXA1646Q/CXA1767Q
Electrical Characteristics
(V
CC
= 8V, Ta = 25C unless otherwise specified)
Circuit current
Total harmonic distortion factor
Output noise voltage
Maximum output voltage
Separation
Maximum attenuation factor
Loudness
Bass max. boost gain
Bass max. cut gain
Treble max. boost gain
Treble max. cut gain
Gain switching
Input voltage
Input voltage range
I
CC
THD
Vn
Vom
CS
ATTm
Glb
Glh
Gbb
Gbc
Gtb
Gtc
Gh
Vsh
Vsl
Vin
No signal
1kHz, 5dBm
Shortcircuit at input, Aweight
1kHz
1kHz
100Hz, VRC = 16dB
10kHz, VRC = 16dB
GAIN = VCT
DATA, INIT
CLK, CE
IN11 to 14
IN21 to 24
VRIN1, 2
FDIN1, 2
--
--
--
8
72
85
7
7
12
12
12
12
5
3
0
1
17
0.005
7
--
90
90
8
8
14
14
14
14
6
--
--
--
21
0.01
10
--
--
--
9
9
16
16
16
16
7
6
1.5
V
CC
1
mA
%
Vrms
dBm
dB
dB
dB
dB
dB
dB
dB
dB
dB
V
V
V
LOW
HIGH
H
L
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
14
CXA1646Q/CXA1767Q
Electrical Characteristic Test Circuit
R
E
O
1
C
E
T
E
S
T
C
L
K
G
N
D
N
C
N
C
V
C
C
V
C
T
D
A
T
A
I
N
I
T
R
E
O
2
IN
AO
1
NC
FN
TO
1
FD
IN
1
TC
O1
TC
LC
12
TC
LC
11
TC
HC
1
VR
IN
1
LD
HC
1
LD
LC
1
NC
NC
FN
TO
2
FD
IN
2
TC
O2
TC
LC
22
TC
LC
21
TC
HC
2
VR
IN
2
IN
AO
2
LD
HC
2
LD
LC
2
NC
G
A
I
N
1
I
N
1
4
I
N
1
3
I
N
1
2
I
N
1
1
N
C
N
C
I
N
2
1
I
N
2
2
I
N
2
3
I
N
2
4
G
A
I
N
2
C1
2
0.0
47
A
C
V
1
4
C
1
4
1
0
C
2
1
0
.
0
4
7
V
4
R
7
1
k
A
C
V
5
S
1
O
P
A
M
P
C
1
1
0
.
0
4
7
C
1
3
C
1
5
0
.
2
2
C
1
7
1
0
R
1
1
1
0
k
2
5
2
6
2
7
2
8
2
9
3
0
3
6
3
5
3
4
3
1
3
2
3
3
S
2
S
1
4
S
1
3
S
1
2
A
C
V
1
3
A
C
V
1
2
A
C
V
1
1
S
1
1
A
C
V
2
1
S
2
1
S
2
2
S
2
3
A
C
V
2
2
A
C
V
2
3
A
C
V
2
4
S
2
4
S
1
5
S
2
5
4
0
3
9
3
8
3
7
4
1
4
2
4
3
4
4
4
5
4
6
4
7
4
8
C
2
2
0
.
0
0
4
7
C
2
3
C
2
4
C
2
5
0
.
2
2
C
2
7
R
2
1
1
0
k
1
2
2
3
4
5
6
7
8
9
1
0
1
1
1
R
1
2
R
V
1
R
3
1
k
R
5
1
k
R
1
C
1
2
2
0
p
V
5
R
6
1
k
V
2
O
P
A
M
P
C
2
1
0
V
1
C
1
0
.
0
0
1
R
2
2
1
0
k
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
5
V
0
V
5
V
0
V
5
V
0
V
C
E
C
L
K
D
A
T
A
C
X
A
1
6
4
6
Q
15
CXA1646Q/CXA1767Q
Application Circuit
R
E
O
1
C
E
T
E
S
T
C
L
K
G
N
D
N
C
N
C
V
C
C
V
C
T
D
A
T
A
I
N
I
T
R
E
O
2
IN
AO
1
NC
FN
TO
1
FD
IN
1
TC
O1
TC
LC
12
TC
LC
11
TC
HC
1
VR
IN
1
LD
HC
1
LD
LC
1
NC
NC
FN
TO
2
FD
IN
2
TC
O2
TC
LC
22
TC
LC
21
TC
HC
2
VR
IN
2
IN
AO
2
LD
HC
2
LD
LC
2
NC
G
A
I
N
1
I
N
1
4
I
N
1
3
I
N
1
2
I
N
1
1
N
C
N
C
I
N
2
1
I
N
2
2
I
N
2
3
I
N
2
4
G
A
I
N
2
C1
2
0.0
04
7
C
1
5
1
0
C
1
7
1
0
C
2
3
1
0
C
2
5
1
0
C
2
6
0
.
2
2
C
2
7
1
0
1
2
2
3
4
5
6
7
8
9
1
0
1
1
1
C
2
1
0
C
X
A
1
6
4
6
Q
C1
4
0.0
06
8
C1
6
0.2
2
C
1
3
1
0
C
1
1
0
.
0
4
7
O
N
6
D
B
O
F
F
0
D
B
C
2
4
0
.
0
0
6
8
C
2
2
0
.
0
0
4
7
C
2
1
0
.
0
4
7
O
N
6
D
B
O
F
F
0
D
B
C
3
3
3
C
1
0
.
0
0
1
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
4
0
3
9
3
8
3
7
4
1
4
2
4
3
4
4
4
5
4
6
4
7
4
8
2
5
2
6
2
7
2
8
2
9
3
0
3
6
3
5
3
4
3
1
3
2
3
3
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility fo
r
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same
.
16
CXA1646Q/CXA1767Q
+14dB
+12dB
+10dB
+8dB
+6dB
+4dB
+2dB
0dB
2dB
4dB
6dB
8dB
10dB
12dB
14dB
CXA1646Q/CXA1767Q Tone control characteristics
R
e
s
p
o
n
s
e
[
d
B
]
Frequency [Hz]
10
100k
10k
1k
100
10
10
0
CXA1646Q/CXA1767Q Loud characteristics
R
e
s
p
o
n
s
e
[
d
B
]
Frequency [Hz]
10
10k
1k
100
20
0
10
VRC = 24dB
VRC = 16dB
VRC = 8dB
VRC = 0dB
17
CXA1646Q/CXA1767Q
Setting Constants
LOUD
The loudness function achieves the necessary frequency characteristics by passing through filter shown below.
The resistor is built in the IC so that f
L
and f
H
are set by selecting C
LDLC
and C
LDHC
.
I/f
L
= 2
C
LDLC
R
1
I/f
H
= 2
C
LDHC
R
2
C
LDLC
R1
5.28k
R2
7.97k
28k
13.2k
AGND
AGND
C
LDHC
f
H
f
L
18
CXA1646Q/CXA1767Q
TONE CONTROL
The tone control function achieves the necessary frequency characteristics by passing through LPF and HPF
shown below.
The resistor is built in the IC so that f
L
and f
H
are set by selecting C
TLC12
and C
TCHC
.
I/f
L
= 2
C
TCLC12
(R
3
//R
4
)
I/f
H
= 2
C
TCHC
R
3
LPF
HPF
R4
8k
AGND
8k
8k
AGND
AGND
R3
8k
C
TCLC12
10k
f
H
f
L
10k
10k
AGND
AGND
C
TCHC
R3
5k
10k
19
CXA1646Q/CXA1767Q
VCT pin
The internal circuit of VCT pin has the following structure.
Insert a buffer when using it as a reference voltage for an external circuit.
GND
V
CC
45k
45k
VCT
20
CXA1646Q/CXA1767Q
Package Outline
Unit: mm
CXA1646Q
SONY CODE
EIAJ CODE
JEDEC CODE
M
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY RESIN
SOLDER / PALLADIUM
PLATING
COPPER / 42 ALLOY
48PIN QFP (PLASTIC)
15.3 0.4
12.0 0.1
+ 0.4
0.8
0.3 0.1
+ 0.15
0.12
13
24
25
36
37
48
1
12
2.2 0.15
+ 0.35
0
.
9
0
.
2
0.1 0.1
+ 0.2
1
3
.
5
0.15
0.15 0.05
+ 0.1
QFP-48P-L04
QFP048-P-1212-B
0.7g
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
21
CXA1646Q/CXA1767Q
CXA1767Q
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY RESIN
SOLDER / PALLADIUM
COPPER / 42 ALLOY
PACKAGE STRUCTURE
PLATING
0.2g
QFP-40P-L01
QFP040-P-0707
40PIN QFP (PLASTIC)
9.0 0.4
+ 0.4
0.3 0.1
0.65
1
10
11
20
21
30
31
40
1.5 0.15
+ 0.35
0.127 0.05
+ 0.1
(
8
.
0
)
A
A
DETAIL
0.1 0.1
+ 0.15
+ 0.15
7.0 0.1
0
.
5
0
.
2
0.1
M
0.12
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