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PB/REC PRE AMP FOR 2 DECK
S1A0291X01
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. 24-SDIP-300
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 S1A0291X01-A0B0
Package 24-SDlP-300
Operating Temperature -25C -- +75C
1
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
BLOCK DIAGRAM
PB NF(2)
PB iN(2)
REC MUTE MUTE IN(2) ALC OUT(2) R/P SW SW
ALC TIME CONSTANT
23
100K
22
B-IN
21
R/P SW A-IN
8
20
19
18
15
100K N.F PRE INPUT
14 REC NF(2) 13
REC IN(2)
PB OUT(2)
24
PRE INPUT
VCC 16 VCC 17 REC GND
RECORE I.REF
REC.BIAS MODE CONTROL /BIAS CIRCUIT
PLAYBACK PB.BIAS I.REF
ALC DET
A/B SELECT SW
9
INPUT
PB OUT(1)
1
PRE 100K
PRE 100K
INPUT N.F
12 11
REC IN(1) REC NF(1)
N.F B-IN A-IN
2
PB NF(1)
3
4
5
A/B SW
7
PB GND
6
MUTE IN(1)
10
REC OUT(1)
PBiN(1)
ABSOLUTE MAXIMUM RATINGS ( Ta = 25C)
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 12 1000 -25 -- +75 -55 -- + 125 Unit V mW C C
2
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
ELECTRICAL CHARACTERISTICS
(Ta = 25C, VCC = 9V, f = 1kHz, unless otherwise specified) Characteristic Circuit Current Open Loop Voltage Gain Output Voltage PLAYBACK Total Harmonic Distortion CH to CH Cross Talk Ain to Bin Equivalent Input Noise Voltage Close Loop Voltage Gain Output Voltage Total Harmonic Distortion RECORD ALC Output Voltage ALC THD ALC Range Cross Talk (ALC) Record TO Playback Cross Talk Muting Range CT2 VNI GVC VO2 THD2 VO(ALC) THDALC RALC
(ALCR)
Symbol ICCQ GVO VO1 THD1 CT1
Test Conditions VI = 0, REC MODE VI = -80dBm THD = 1%, NAB VO = 0.2V, NAB VO = 0.5V, NAB VO = 0.5V, NAB Fiter: 20Hz - 20kHz RG = 2.2k, VI = 0 VI = 68dBm, ALC off THD = 1%, ALC off VI = 0dBm, ALC off VI = -20dBm VI = -20dBm VI = -60dBm, +3dB UP VI = -50dBm REC input = GND PLAY output = 0.5V VI = -20dBm
Min. 10 60 0.75 - - - - 58 1.2 - 0.75 - 40 - - -
Typ. 18 90 1.2 0.05 -55 -55 1.2 60 1.6 0.2 0.95 0.2 50 -55 -60 -55
Max. 26 - - 0.3 - 45 - 45 2.2 62 - 1 1.35 1.0 - -40 -40 -40
Unit mA dB V % dB dB V dB V % V % dB dB dB dB
CT3 CT4 MR
3
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
TEST CIRCUIT
PB OUT OPEN = CLOSE LOOP SHORT = OPEN LOOP SW4-1
PB B-IN
PB A-IN
MUTE OUT
MUTE IN
Vcc = 9V
REC OUT
REC IN
150
10k
10k
10k
100
2.2k
10k 47F 6.2k 10F
0.027F
2.2k
2.2k
22F
SW3
10 F
1M
10 F 47 F 10 F
SHORT= MUTE NO
24
23
22
21
20
19
18
17
16
15
14
13
S1A0291X01
1 2 3 4
GND SHORT 0.027F 2.2k = A-IN = B-IN 2.2k SW1 10 F
5
6
7
8
GND SHORT
9
= PLAY = REC SW2
10
11
12
47 F 10 F 10 F
10 F 6.2k
10k 10k SW4-2 150
47F
10k
100
2.2k
PB OUT
OPEN = CLOSE LOOP SHORT = OPEN LOOP
PB B-IN
PB A-IN
MUTE IN
MUTE OUT
REC OUT
REC IN
NOTE: These specifications are subject to change without notice.
4
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
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
P
R R/P SW
VCC A/B SELECT SW
8
5
CONTROL
CONTROL
REC BIAS ON
A/B SELECT DISABLE
A-INPUT AVAILABLE PLAYBACK BIAS
A-INPUT BIAS
B-INPUT BIAS
5
S1A0291X01
PB/REC PRE AMP FOR 2 DECK
B. Playback Mode Schematic
VCC P R R/P SW A/B SELECT SW
8
5
CONTROL
CONTROL
REC BIAS OFF
A/B SELECT VALID
PLAYBACK BIAS
A-INPUT BIAS B-INPUT BIAS
NOTE: These specification are object to change without notice.
2. PLAYBACK A/B INPUT SELECT SWITCH(only playback mode)
A
B
VCC
A/B SELECT SW
5
CONTROL
PLAY BACK BIAS
A-INPUT BIAS B-INPUT BIAS
6
PB/REC PRE AMP FOR 2 DECK
S1A0291X01
3. MUTE SWITCH
VCC SHORT=MUTE ON 10K
20 19
6
NOTES: 1. THIS CIRCUIT IS OPERATED ON REVERSE SATURATION MODE 2. These specifications are subject to change without notice.
7
S1A0291X01
APPLICATION CIRCUIT
BIAS OSC 10k VR1 R67 47k D11 1N4148 R72 220k D3 1N4148 R31 220 D9 1N4148 R59 10k Q7 C1008 R70 2.2k D4 1N4148 Q15 A733 D8 1N4148
R34 2.2k C33 1000pF VR2 47k VR1 47k R62 4.7k 2.2k R54 3.3k Q17 C945 R51 2.2k R55 39k VR3 5k Q16 A733 HI - SPEED D10 1N4148 Q19 C945 Q11 C945 R42 2.2k R48 2.2k R46 2.2k Q12 C945 R44 2.2k D5 IN4148 R45 3.3k Q14 C945 R57 4.7k Q13 C945 R43 3.3k C41 0.01F D7 1N4148 R41 2.2k Q18 C1008 R61 Q10 A733
R35 2.2k
C39 0.022F
R39 10k
R60 22k
R32 2.2k
R33 2.2k
C34 220pF
220pF
REC
A B M-B M-B
C42 100F/16V R56 10
R26 10k R26 1k 1F/50V R17 82 C23 47F/10V C29 100pF C30 0.018F C31 1000pF D6 1N4148 C20 100pF R20 100 R22 R23 10k C30 100F/10V C27 1F/50V C28 100pF R28 100 R24 2.7k R66 2.2k R43 10k Q9 C945
C32
R27 47U
R37 4.7k
.
C18 470pF
D2 1N4148 C25 100 1F/50V C17 100pF R16 10k C22 R18 47F/10V 5.6k 560k R21
85K
ERASE HEAD R14 2.2k 100pF C19 R15 2.2k
C24 100F/10V
C19 0.022F
Q2 C1008
GND VCC
POWER SW
R/P DECK
24
23
22
21
20
19
18
17
16
15
14
13
L
R13 2.2k
S1A0291X01
1
C1 R2 2.2k 100pF 100pF R1 2.2k C8 C7 0.022F
R12 2.2k
R
2
3
4
5
6
7
8
9
10
11
12
R50 220k C44 1F/50V R65 33k R64 33k C43 0.01F C45 1F/50V R49
R
PB DECK C13 1F/50V C14 100F/10V R38 10k C15 1F/50V C2 100pF R3 5.6k C3 100pF C11 47F/10V C5 0.022F R4 82 C9 R7 R8 0.018F 100 2.7k R5 4.7k R6 10k C10 0.022F
L
220k
L
85K
R C4 470pF
100k C23 1F/50V
C49 1000pF R69 1k
L GND
R71 1k C47 1F/50V
1F/50V 1k IN4148 R9 R11 10k 47k
PB/REC PRE AMP FOR 2 DECK
R
OUT PUT
C21 1000pF
REC IN
GND
Q1 C1008
PB
Q6 C1008
Q4 C1008
B - PLAY
R/P
8
C40 100F/10V C37 0.015pF R68 22k R30 33 C38 0.022F Q8 A733
Q5 C1008
Q3 C1008
A - PLAY

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