PB/REC PRE AMP FOR 2 DECK
S1A0291X01
1
INTRODUTION
The S1A0291X01 is a monolithic integrated circuit consisting of
a dual input playback amplifier and a dual input record amplifier
for double-deck or auto-reverse operation.
It is suitable for 6V -- 9V double-deck or auto-reverse cassette
applications.
FEATURES
Dual input two-channel playback amplifier
Two-channel record amplifier
Built-in ALC and Muting circuit
PB/REC and playback input select switch included
Power ON ALC discharge circuit included
Operating supply voltage: Vcc = 4V -- 12V
REC/PB power on quick start circuit
Few external part required
ORDERING INFORMATION
Device
Package
Operating Temperature
S1A0291X01-A0B0
24
-
SDlP
-
300
-
25
C -- +75
C
24
-
SDIP
-
300
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
2
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS ( Ta = 25
C)
Characteristic
Symbol
Value
Unit
Supply Voltage
V
CC
12
V
Power Dissipation
P
D
1000
mW
Operating Temperature
T
OPR
-
25 -- +75
C
Storage Temperature
T
STG
-
55 -- + 125
C
14
13
12
11
23
22
21
8
20
19
18
15
24
16
9
1
17
10
2
3
4
5
7
6
PB OUT(2)
V
CC
V
CC
REC GND
PB OUT(1)
PB NF(1)
PBiN(1)
A/B
PB
MUTE
SW
GND
IN(1)
REC
OUT(1)
PB NF(2)
PB iN(2)
R/P SW
MUTE
ALC
SW
MUTE
IN(2)
REC
OUT(2)
REC IN(2)
REC IN(1)
REC NF(1)
PRE
100K
INPUT
REC.BIAS
RECORE
PLAYBACK
PB.BIAS
100K
INPUT
PRE
N.F
ALC
INPUT
N.F
100K
PRE
N.F
PRE
INPUT
100K
B
-
I
N
A
-
I
N
A
/
B
S
E
L
E
C
T
S
W
B
-
I
N
A
-
I
N
R
/
P
S
W
A
L
C
T
I
M
E
C
O
N
S
T
A
N
T
I.REF
I.REF
MODE CONTROL
/BIAS CIRCUIT
DET
REC NF(2)
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
3
ELECTRICAL CHARACTERISTICS
(Ta = 25
C, V
CC
= 9V, f = 1kHz, unless otherwise specified)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Circuit Current
I
CCQ
V
I
= 0, REC MODE
10
18
26
mA
P
L
A
Y
B
A
C
K
Open Loop Voltage Gain
G
VO
V
I
=
-
80dBm
60
90
-
dB
Output Voltage
V
O1
THD = 1%, NAB
0.75
1.2
-
V
Total Harmonic Distortion
THD1
V
O
= 0.2V, NAB
-
0.05
0.3
%
Cross Talk
CH to CH
CT1
V
O
= 0.5V, NAB
-
-
55
-
45
dB
Ain to Bin
CT2
V
O
= 0.5V, NAB
-
-
55
-
45
dB
Equivalent Input Noise Voltage
V
NI
Fiter: 20Hz
-
20kHz
RG = 2.2k
, V
I
= 0
-
1.2
2.2
V
R
E
C
O
R
D
Close Loop Voltage Gain
G
VC
V
I
= 68dBm, ALC off
58
60
62
dB
Output Voltage
V
O2
THD = 1%, ALC off
1.2
1.6
-
V
Total Harmonic Distortion
THD2
V
I
= 0dBm, ALC off
-
0.2
1
%
ALC Output Voltage
V
O(ALC)
V
I
=
-
20dBm
0.75
0.95
1.35
V
ALC THD
THD
ALC
V
I
=
-
20dBm
-
0.2
1.0
%
ALC Range
R
ALC
(ALCR)
V
I
=
-
60dBm, +3dB UP
40
50
-
dB
Cross Talk (ALC)
CT3
V
I
=
-
50dBm
-
-
55
-
40
dB
Record TO Playback Cross Talk
CT4
REC input = GND
PLAY output = 0.5V
-
-
60
-
40
dB
Muting Range
MR
V
I
=
-
20dBm
-
-
55
-
40
dB
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
4
TEST CIRCUIT
NOTE: These specifications are subject to change without notice.
S1A0291X01
1
2
3
4
7
20
8
5
6
22
21
24
23
11
10
9
14
16
15
18
17
19
12
13
REC
IN
MUTE
OUT
MUTE
IN
PB
A-IN
PB
OUT
OPEN = CLOSE
LOOP
SHORT = OPEN
LOOP
PB
B-IN
10k
10
F
150
6.2k
0.027
F
47
F
2.2k
2.2k
10
F
10k
SW2
SW1
10
F
10k
10
F
2.2k
47
F
100
SW4-2
GND = A-IN
SHORT = B-IN
GND = PLAY
SHORT = REC
PB
A-IN
PB
OUT
OPEN = CLOSE LOOP
SHORT = OPEN LOOP
PB
B-IN
10k
10
F
150
6.2k
0.027
F
47
F
2.2k
2.2k
SW4-1
10k
MUTE
OUT
MUTE
IN
10
F
10k
REC
OUT
REC
IN
10
F
10k
10
F
2.2k
47
F
100
REC
OUT
Vcc = 9V
22
F
1M
SW3
SHORT=
MUTE NO
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
5
APPLICATION INFORMATION
1. R/P SWITCH
Apply R/P input voltage at PIN 8.
PLAY: 0V (GND)
REC: 4.5V
-
12V (Do not apply above 13V).
Only valid A/B input select in playback mode.
In record mode, the playback A-input is available and the ALC is turned on by record bias.
A. Record Mode Schematic
8
5
CONTROL
CONTROL
REC BIAS ON
PLAYBACK
BIAS
A/B SELECT SW
R/P SW
R
V
CC
B-INPUT BIAS
A-INPUT AVAILABLE
A/B SELECT
A-INPUT
BIAS
DISABLE
P
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
6
B. Playback Mode Schematic
NOTE: These specification are object to change without notice.
2. PLAYBACK A/B INPUT SELECT SWITCH(only playback mode)
8
5
CONTROL
CONTROL
REC BIAS OFF
PLAYBACK
BIAS
A/B SELECT SW
R/P SW
R
V
CC
B-INPUT BIAS
A/B SELECT
A-INPUT
BIAS
VALID
P
5
V
CC
B
A
A/B SELECT SW
PLAY BACK
BIAS
A-INPUT BIAS
B-INPUT BIAS
CONTROL
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
7
3. MUTE SWITCH
NOTES:
1.
THIS CIRCUIT IS OPERATED ON REVERSE SATURATION MODE
2.
These specifications are subject to change without notice.
19
6
20
SHORT=MUTE ON
V
CC
10K
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
8
APPLICATION CIRCUIT
L
R
R/P DECK
100pF
.
C1008
1N4148
470pF
ERASE -
HEAD
1
F/50V
85K
220
pF
220pF
2.2k
C1008
1000pF
BIAS OSC
220
0.022
F
C1008
C945
47
C945
C945
C945
C945
A733
1N4148
1N4148
1N4148
C1008
1N4148
M - B
M - B
GND
VCC
GND
R
L
GND
L
R
REC IN
OUT PUT
A - PLAY
B - PLAY
REC
A733
HI - SPEED
A
B
POWER
SW
1N4148
1N4148
1N4148
1000pF
A733
R/P
PB
1N4148
A733
C945
IN4148
C945
C34
Q5
R34
VR2
VR1
R26
C32
C33
C38
VR1
Q7
R30
C39
R31
C37
C40
R26
C19
R17
C20
C22
R18
R16
D6
R20
C23
C24
R21
C29
R22
C25
R23
R27
C30
R28
R24
C30
C31
C27
C28
R15
C17
R14
C18
Q2
R11
C2
R3
C5
R4
C11
C3
R5
R1
C1
R2
R38
C7
R6
C9
R7
R8
C13
C14
C15
C10
C8
D5
R9
C47
C23
C45
C49
C21
C44
R57
C43
R45
Q14
R46
R48
Q13
R43
Q11
Q12
R42
C41
Q19
R66
Q9
D7
D10
R41
Q16
R55
VR3
R51
Q18
R61
R54
R62
Q10
R50
R49
R64
R65
R56
R69
R71
C42
D4
D3
D8
R60
Q8
R39
D9
D11
R70
R68
R72
Q15
R67
R59
R43
R37
R13
R12
D2
S1A0291X01
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
16
10
15
11
14
12
13
9
R
L
PB DECK
C1008
Q6
C1008
Q3
C1008
Q4
2.2k
R35
2.2k
R32
2.2k
R33
47k
47k
10k
1k
100
F/10V
0.015pF
10k
33
0.022
F
47k
22k
10k
2.2k
220k
10k
22k
85K
100pF
0.022
F
82
5.6k
47
F/10V
100pF
10k
2.2k
2.2k
100pF
C19
2.2k
2.2k
C1008
Q1
2.2k
100pF
560k
47
F/10V
100
F/10V
100
100pF
100
10k
0.018
F
1
F/50V
100
F/10V
1
F/50V
100pF
100
2.7k
1000pF
100pF
470pF
C4
0.022
F
5.6k
82
47
F/10V
100pF
2.2k
4.7k
10k
0.022
F
1
F/50V
100
F/10V
1
F/50V
10k
0.018
F
100
2.7k
0.022
F
IN4148
47k
100k
1
F/50V
10k
1k
4.7k
2.2k
Q17
2.2k
10k
2.2k
R44
2.2k
0.01
F
3.3k
2.2k
2.2k
3.3k
0.01
F
1
F/50V
1
F/50V
2.2k
39k
4.7k
5k
2.2k
3.3k
100
F/16V
10
220k
4.7k
33k
33k
220k
1
F/50V
1
F/50V
1000pF
1k
1k
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