ICs for Cassette, Cassette Deck
s
Overview
The AN7352S is a bipolar IC developed as a playback
pre-amplifier of analogue cassette deck. Particularly in
order to support the automatic adjustment, it incorporates
various volume filter circuits and control functions. Also, it
has realized great reduction of external parts required.
s
Features
Variable volume circuits for playback gain adjustment
built-in
Various equalizer switching circuit built-in
Series mute circuit built-in
MS (head locating) amp. comparator circuit built-in
AN7352S
Playback Pre-amplifier for Stereo Cassette Deck
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
0.4
0.25
0.45
1.27
0.1
0.1
0.3
9.4
0.3
0.15
0.925
2.0
0.2
17.81
0.3
Unit : mm
7.2
0.3
28-Lead SOP Package (SOP028-P-0375A)
Pin No.
Pin Name
21
22
23
24
25
26
27
28
P/R LOGIC
PB Monitor Output
120
/ 70
(
2) NF SW
120
/ 70
(
1) NF SW
PB NF Input (L Ch.)
PB T2 Input (L Ch.)
PB T1 Input (L Ch.)
GND
Pin No.
Pin Name
1
2
3
4
5
6
7
8
9
10
V
CC
PB T1 Input (R Ch.)
PB T2 Input (R Ch.)
PB NF Input (R Ch.)
120
/ 70
(
2) NF SW
120
/ 70
(
1) NF SW
PB Monitor Output
T1/ T2 LOGIC
120
/ 70
LOGIC
PB Output (R Ch.)
s
Pin Name
Pin No.
Pin Name
11
12
13
14
15
16
17
18
19
20
Volume Control (R Ch.)
MS Input
+V
CC
MS NF Input
MS Output
MS De-coupling
MS GND
Volume Control (L Ch.)
PB Output (L Ch.)
1/
2 LOGIC
28
1
3
10
13
14
11
12
4
5
7
8
9
26
25
24
23
22
21
20
19
18
17
16
15
27
2
6
CTL
120
/
70
T1/
T2
P/
R
1/
2
CTL
1k
47k
22k
82k
47pF
+
+
+
GND
+V
CC
V
CC
s
Block Diagram
ICs for Cassette, Cassette Deck
AN7352S
V
CC
I
CC
(+)
I
CC
()
P
D
T
opr
T
stg
Supply Voltage
Supply Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
V
mA
mA
mW
C
C
Parameter
Symbol
Rating
Unit
6.7
22
20
702
25 ~ + 75
55 ~ + 150
s
Absolute Maximum Ratings
(Ta=25C)
4.5V ~
6.5V
s
Recommended Operating Range
(Ta= 25C)
Parameter
Symbol
Range
Operating Supply Voltage Range
V
CC
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Consumption Current
9
I
tot
22
mA
V
CC
=
6V, At no signals
11
Reference Output Level (0dB)
45.4
V
1
49.4
dB
47.4
V
in
= 50dBv, f
= 1kHz
30kHz LPF ON, V
CNT
= 2.5V
G
H
Reference Output Level (+ 6dB)
V
CNT
= 5V, G
H
= DATA
(2)
DATA
(1)
+5
+6
+7
dB
G
L
Reference Output Level ( 6dB)
V
CNT
= 1.25V, G
L
= DATA
(3)
DATA
(1)
7
6
5
dB
DG
LR
Level Difference Between Channels
V
CNT
= 2.5V, DG
LR
= V
1L
V
1R
0
1
dB
DG
T12
Level Difference Between Tapes
V
CNT
= 2.5V, DG
T1T2
= V
1T1
V
1T2
0
1
dB
THD
11
Total Harmonics Distortion (0dB)
V
CNT
= 2.5V, V
9
/V
20
= 0V, V
8
/V
21
= 5V
0.1
0.3
%
V
no
Output Noise Voltage
V
CNT
= 2.5V, DIN AUDIO, R
g
= 2.2k
69
62
dBv
V
OMX
Maximum Output Level (0dB)
V
CNT
= 2.5V, THD
= 3%
2
3.6
dBv
V
OFF
Output Offset Voltage (0dB)
V
CNT
= 2.5V, R
g
= 220
230
+130
mV
Muting Attenuation
60
G
M0
dB
V
CNT
= 0V
Muting Attenuation (T1)
60
G
M1
dB
V
CNT
= 2.5V
Muting Attenuation (T2)
60
G
M2
dB
V
CNT
= 2.5V
MS Amp. Section
V
CC
=
6V, V
15
= 0.3V
4kHz Gain (Input Voltage)
G
MS1
51
dBv
f
= 4kHz
High-Frequency Band Gain (Input Voltage)
G
MS2
44
dBv
f
= 50kHz
Logic L
V
CC
=
4.5V
Time Constant Switching Pin Voltage
0
V
9L
1.5
V
120
s mode
Tape Switching Pin Voltage
0
V
8L
1.2
V
T2 mode
Speed Switching Pin Voltage
0
V
20L
1.2
V
Double speed (
2) mode
R P Switching Pin Voltage
0
V
21L
1.5
V
R mode
Logic H
V
CC
=
6.5V
Time Constant Switching Pin Voltage
2.6
V
9H
5
V
70
s mode
Tape Switching Pin Voltage
3.1
V
8H
5
V
CT
Crosstalk Between Channels
V
CNT
= 2.5V, R
g
= 220
60
dB
Speed Switching Pin Voltage
3.1
V
20H
5
V
Double speed (
1) mode
R P Switching Pin Voltage
2.6
V
21H
5
V
P mode
Mute
V
CC
=
6V
Mute ON Voltage
0
V
mute1
0.7
V
Mute OFF Voltage
1.25
V
mute2
5
V
T1 mode
s
Electrical Characteristics
(V
CC
=
6V, Ta=25C)
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