PB/REC EQ ST PRE AMP
S1A0292A01
1
INTRODUCTION
The S1A0292A01 is a monolithic integrated circuit consisting of
a playback and record processing stereo amplifier, which is
suitable for an audio system.
FEATURES
2CH Double input playback amplifier
2CH Recording Amplifier
Bulit-in Recording Equalizer
Tape selector
ALC circuit
Mute circuit
Operating voltage (V
CC
= 6V
-
12V)
ORDERING INFORMATION
Device
Package
Operating Temperature
Pitch
S1A0292A01-Q1R0
48
-
QFP
-
1010E
-
20
C
-
+70
C
0.8mm
-
20
C
-
+70
C
0.75mm
48
-
QFP
-
1010E
S1A0292A01
PB/REC EQ ST PRE AMP
2
BLOCK DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
EQ & REC AMP
-
+
1.1V
I
EQ CONTROL
ALC DETECTOR
ALC DRIVER
CONTROL
LOGIC
EQ & REC AMP
+
-
+
-
Cro2
300K
6K
10K
Cro2
300K
LINE OUT
REC NF
LINE IN
ALC NF1
REC R/R
V/2 PR
ALC R/R
MUTE IN
Vcc
HEAD SW
MIXER OUT
FILCAP
P
B
O
U
T
2
C
R
O
U
T
P
B
O
U
T
N
F
P
L
A
Y
A
i
N
B
i
N
A
G
N
D
1
A
I
N
B
I
N
N
F
P
L
A
Y
P
B
O
U
T
C
R
O
U
T
LINE OUT
REC NF
LINE IN
ALC NF2
DUB SW
IREF
Cro2A SW
Cro2B SW
R/P SW
A/B SW
FIL CAP
PB OUT2
R
E
C
I
N
L
O
W
C
A
P
G
L
G
M
R
E
C
O
U
T
A
G
N
D
2
F
E
C
O
U
T
F
/
Q
F
Q
G
P
L
O
W
C
A
P
R
E
C
I
N
VOLTAGE
REGULATOR
PB/REC EQ ST PRE AMP
S1A0292A01
3
PIN DESCRIPTION
Pin Description
Pin No
Symbol
I/O
Description
1
LINE OUT(R)
OUTPUT
CCA (ALC Output) pin
2
NF REC
INPUT
Record amp feedback pin
3
LINE IN(R)
INPUT
Line input pin
4
ALC NF1
INPUT
ALC Amp feedback pin
5
REC R/R
-
Record ripple reject pin
6
VCC/2 R/R
-
Voltage reference ripple filter
7
ALC R/R
-
ALC time constant
8
MUTE IN
INPUT
Mute Signal ( High Active (Input))
9
V
CC
V
CC
V
CC
10
HEAD SW
OUTPUT
Head switching DC output pin
11
MIXER OUT
OUTPUT
Playback mixer out
12
FILCAP(R)
-
HI-Speed filter capacitor
13
PB OUT-2(R)
OUTPUT
Playback output (for copy)
14
CROUT(R)
OUTPUT
Playback Cro2 feedback output
15
PB OUT-1(R)
OUTPUT
Playback tape out
16
NF PLAY
INPUT
Playback feedback input pin
17
A-IN(R)
INPUT
Playback A-Deck input pin
18
B-IN(R)
INPUT
Playback B-Deck input pin
19
AGND 1
GND
Play GND
20
A-IN(L)
INPUT
Playback A-Deck input pin
21
B-IN(L)
INPUT
Playback B-Deck input pin
22
NF PLAY(L)
INPUT
Playback feedback input pin
23
PB OUT-1 (L)
OUTPUT
Playback tape out
24
CROUT-2 (L)
OUTPUT
Playback Cro2 feedback output
25
PB OUT-2 (L)
OUTPUT
Playback output (for copy)
26
FILC AP (L)
-
HI-Speed filter capacitor
27
A.B-SW
INPUT
A-Deck (High Active) switch
28
R/P-SW
INPUT
Record (High Active) switch
29
Cro2B-SW
INPUT
Cro2-B-Deck (high active) switch
30
Cro2B-SW
INPUT
Cro2-A-Deck (high active) switch
31
IREF
-
EQ-BPF-IREF adjust
S1A0292A01
PB/REC EQ ST PRE AMP
4
32
DUB-SW
INPUT
Normal (open) hi-speed (short)
33
ALC IN(L)
INPUT
ALC amp feedback pin
34
LINE IN(L)
INPUT
Line input pin
35
NF REC
INPUT
Record amp feedback pin
36
LIN OUT(L)
OUTPUT
CCA out
37
REC IN(L)
INPUT
Record input pin
38
LOWCAP(L)
-
REC equalizer low point capacitor
39
GP
-
REC equalizer gain control pin
40
FQ
-
REC equalizer q point control pin
41
F/Q
-
REC equalizer q & bw control pin
42
REC OUT(L)
OUTPUT
Record output pin
43
AGND2
-
REC gnd
44
REC OUT(R)
OUTPUT
Record output pin
45
GM
-
REC equalizer mid-gain control pin
46
GL
-
REC equalizer low-gain control pin
47
LOWCAP(R)
-
REC equalizer low point capacitor
48
REC IN(R)
INPUT
Record input pin
Pin Description (Continued)
Pin No
Symbol
I/O
Description
PB/REC EQ ST PRE AMP
S1A0292A01
5
ABSOLUTE MAXIMUM RATING (Ta = 25
C)
ELECTRICAL CHARACTERISTICS
(V
CC
= 9V, f = 1kHz, unless otherwise specified)
Characteristic
Symbol
Value
Unit
Supply voltage
V
CCQ
12
V
Power dissipation
P
D
500
mW
Operating temperature
T
OPR
-
20
-
+70
C
Storage temperature
T
STG
-
50
-
+125
C
Characteristic
Symbol
Test conditions
Min.
Typ.
Max.
Unit
Quiescent circuit curent
I
CC
REC MODE, V
I
= 0
25
30
40
mA
P
L
A
Y
B
A
C
K
Closed Loop Voltage Gain
G
VC
-
37
40
43
dB
Maximum Output Voltage
V
OI
THD = 1% 0.71Vrms
0.7
1
-
Vrms
Total Harmonic Distortion
THD1
V
O
= 0dBm
-
0.1
0.5
%
Cross Talk
CT1
V
SG
=
-
40dBm
40
55
-
dB
Muting Attenuation
ATT
MUTE1
V
SG
=
-
40dBm
55
70
-
dB
A
L
C
ALC Voltage
V
OCALCY
V
SG
=
-
20dB
28
35
45
mVrms
ALC Distortion
THD
ALC
V
SG
=
-
20dB
-
0.3
1
%
ALC Range
V
ALC
THD = 1% point up
25
32
-
dB
R
E
C
O
R
D
EQ Low frequency Gain
E
GH
f = 50Hz/
-
40dB
29
33
37
dB
EQ Mid Frequency Gain
E
GM
f = 500Hz/
-
40dB
21
25
29
dB
EQ Peak Frequency Gain
E
QP
f = variable/
-
40dB
35
41
46
dB
Maximum, Output Voltage
V
O2
THD = 1%
1
2
-
Vrms
Record Switch Voltage
REC MODE
2.4
3.5
-
V
Total Harmonic Distortion
THD
2
V
O
= 0dBm
-
0.5
1
%
Cross Talk
CT
2
V
SG
=
-
40dBm
40
50
-
dB
Muting Attenuation
ATT
MUTE2
V
SG
=
-
40dB
55
70
-
dB
S1A0292A01
PB/REC EQ ST PRE AMP
6
TEST CIRCUIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
EQ & REC AMP
-
+
1.1V
I
EQ CONTROL
ALC DETECTOR
ALC DRIVER
CONTROL
LOGIC
EQ & REC AMP
VOLTAGE
REGULATOR
+
-
+
-
Cro2
300K
6K
10K
Cro2
300K
+
+
-
+
+
+
+
Vcc
DVM
+
10K
10K
10K
6K
N
N
+
+
-
+
+
+
+
-
+
+
-
+
+
+
+
+
-
+
-
+
+
-
TA1
10/16
1K
10/16
10/16
2K
VSG9
10/16
10/16
10/16
22/16
2MEG
SW7
MUTE =HIGH
ACTIVE
5V
Vcc
CURRENT METER
TA11
10/16
0.01
10/16
TA13
10K
10K
10K
1/16
10/16
+
TA15
10K
100
+
10/16
100
2K
VSG1
10/16
10/16
2K
+
-
VSG2
10/16
2K
VSG3
2K
VSG4
10/16
100
10/16
100
10/16
TA23
10K
1/16
10K
10K
10K
TA25
10/16
0.01UF
SW1
5V
A=SHORT
B=OPEN
SW2
5V
REC=SHORT
PB=OPEN
SW3
SW4
B-DECK
Cro2=SHORT
A-DECK
Cro2=SHORT
20K/SVR
for ADJUST
SW6
NORMAL SPEED-OPEN
HI-SPEED=SHORT
VSGS
2K
10/16
+
+
10/16
10/16
+
10/16
1K
TA36
VSG6
2K
10/16
CL
0.01
RGF
11K
RFQ
33K
RF/Q
127K
TA42
10/16
+
2K
TA43
10/16
+
2K
RGM
20.6K
RGL
1.3K
CL
0.01
10/16
VSG7
2K
+
+
PB/REC EQ ST PRE AMP
S1A0292A01
7
APPLICATION INFORMATION
1. FUNCTION SWITCH
-- A/B SWITCH : A-DECK MODE = HIGH (5 V)
B-DECK MODE = OPEN (HIGH IMPEDANCE)
*** On record mode, A-DECK is work only
NOTE: The voltage of pin 27 is forced by a switch controller. If the voltage varies very fast from low to high, or high to low, then
tape output makes a large pop noise.
To avoid this, we recommend slow switching.
-- R/P SWITCH : REC MODE = HIGH (5 V)
PLAY MODE = OPEN (HIGH INPEDANCE) OR GND
-- Cro2B SWITCH : (B-DECK ONLY)
Cro2B PLAY = GND (0 V)
Cro2B OFF = OPEN (HIGH INPEDANCE ) OR V
CC
-- Cro2A SWITCH : (A-DECK ONLY)
Cro2A PLAY = GND (0 V)
Cro2A OFF = OPEN (HIGH INPEDANCE ) OR V
CC
-- DUBBING SWITCH : NORMAL SPEED TAPE EQUALIZING = OPEN (HIGH IMPEDANCE) OR V
CC
HIGH SPEED TAPE EQUALIZING = GND (0 V)
-- MUTE SWITCH : MUTE ON = HIGH (5 V)
MUTE OFF = OPEN (HIGH IMPEDANCE) OR GND
A-on
B-on
A/B
function
B-off
A-off
2.5V
1.5V
Voltage of pin 27
S1A0292A01
PB/REC EQ ST PRE AMP
8
2. RECORD EQUALIZER SETTING
This device has a frequency compensator, record equalizer circuit for boost, cut and a peak frequency that is used
for tape recording.
Low and mid (about 30-3 kHz) frequency is fixed by the external capacitor CL, and the gain is adjusted by two
resistors that connect the RGM and RGL pins to the ground.
Internal part R
M3
and external C
L
are fixed and R
GM
is adjustable by means of the external. Hence, gain of mid and
low frequency are controlled.
High frequency peaking function consisting of a 2nd order band pass filter, can adjust the band width, gain and
peak frequency using the external resistor R
GP
, R
FQ
and R
F/Q.
We have shown that R
IREF
is a semi-fixed resistor, which compensates internal capacitors for variations of the fab-
ric process.
Constant K is a gain to be fixed but K
5
is variable. Only K
5
can be used to adjust the final record gain.
GEQ = K
5
(K
3
G
BPF
+ A
HPF
)
K
3
= 0.5, K
4
= 0.5
22000
S
R
GM
A
HPF
=
S +
R
M3
* C
L
1
A
LPF
=
S +
R
M3
* C
L
1
1
R
M3
* C
L
R
GL
8800
RM3 = 10 K, fp =
2*
RM3 * C
L
1
, CL = external constant
Gain
f
A
BPF
=
K
1
G
1
G
F/Q
S
C
F/Q
S
2
+
C
F/Q
C
F/Q
S +
K
2
G
F/Q
G
FQ
C
F/Q
C
FQ
O =
C
F/Q
C
FQ
C
F/Q
C
FQ
Q = C
F/G
C
F/Q
C
FQ
C
F/Q
G
PF
= K
1
G
1
G1 =
4.4
R
GP
, G
F/Q
=
1
15K *
2R
IREF
R
F/Q
, G
FQ
=
1
15K *
R
IREF
R
F/Q
,
K
1
= 40e4
K
2
= 1
G
F/Q
= 160pF
,
,
,
,
,
,
,
C
F/Q
= 70pF
PB/REC EQ ST PRE AMP
S1A0292A01
9
If K
5
is 10, the record maximum output level is 1 Vrms and the output noise is 0.8 mVrms. We recommend that you
keep it between 10 and 20 if possible.
Point A is pin 2 and pin 35, B is pin 44 and pin 42.
K
5
, close loop gain, is R/Rrr.
We must connect R
GP
, R
F/Q
, R
GL
and RGM to the ground.
R
GP
= PIN39
FQ
= PIN40
R
F/Q
= PIN41
R
GM
= PIN45
R
GL
= PIN46
R
IREF
= PIN31
C
L
= PIN38, PIN47
AHPF
+
ALPF
K1
BPF
K4
K3
+
K5
INPUT
OUTPUT
(Record equalizer block)
+
-
B
R = 20K
Rrr
A
S1A0292A01
PB/REC EQ ST PRE AMP
10
3. CONNECTION FOR PARAMETERS
For varying the record frequency responce, we must connect the external resistor.
In the following figure, current flows from transistor through resistor. As we know, the current is defined as (1.2 V-1
VBE)/R, amount of this current influence for Gm (transconductance amplifier trensfer ratio).
Method of connection: connect the control pins to ground.
4. ALC LEVEL ADJUSTMENT
This device is built so that the automatic level control circuit has a fixed level, but the user can adjust it to be larger
VOLTAGE REFERENCE
1.2 V generator
PIN 45, PIN 44 .... PIN 31, etc.
R
GM
.... etc....
+
-
NN
NC
NM
HN
HM
45
44
41
40
39
31
DECODER (OPEN DRAIN OR
OPEN COLLECTOR)
An enabled resistor must be
ground connected but others
maintain high impedance state.
PB/REC EQ ST PRE AMP
S1A0292A01
11
than the fixed level. The design is fixed to 35 mVrms, but adding an external part will change that to a higher level
of 1 Vrms, level and range is shown in the following figure. The user may align it to his/her own needs.
The ALC out level, LINE OUT level is defined as
To change GV, add a resistor that means at pin 4 or pin 33 as shown.
CCA
AMP
Level DETECTOR
LINE IN
+
-
LINE OUT
1V PEAK DETECT
R1=20K
R2=1K
GV=R1/R2
PIN4 or PIN33
R2
R1
ALC OUT =
GV
1
2
2
2
1
= 35 mV
rms
S1A0292A01
PB/REC EQ ST PRE AMP
12
5. PERIPHERAL OF PLAYBACK AMP
1) NAB elements
H
NAB
(S) =
S + R
Z
C
1
1
S + (R
1
+R
Z
)C
1
1
RZ = R2/R3: Cro MODE
RZ : NORMAL MODE
GPB(S) = HNAB(S) *
(R
1
+R
Z
)R
4
R
1
R
Z
R
4
1
HNB(S) *
R4
RZ
+
A=90dB
-
A OR B IN
R
1
300K
C1
N.F
47uF
R
4
R
2
R
3
CBOUT
-1
CROUT
X1
10K
R
5
R
6
6K
FILCAP
C
2
PB OUT-2
REC DUBING
fp =
2*
*(R
1
+ R
Z
)*C
1
1
fz =
2*
*R
Z
C
1
1
G
Freq.
fz
fp
PB/REC EQ ST PRE AMP
S1A0292A01
13
2) High speed dubbings cutting function is defined R5, R6, C2
HI(S) =
R
6
R
5
+ R
6
X
S +
1
C
2
R
6
S +
1
C
2
(R
5
+ R
6
)
t2
frequency
t1
gain
S1A0292A01
PB/REC EQ ST PRE AMP
14
APPLICATION CIRCUIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
EQ & REC AMP
-
+
1.1V
I
EQ CONTROL
ALC DETECTOR
ALC DRIVER
CONTROL
LOGIC
EQ & REC AMP
VOLTAGE
REGULATOR
+
-
+
-
Cro2
300K
6K
10K
Cro2
300K
Vcc
10K
10K
10K
6K
N
N
+
MPX
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
REC OUT
REC IN
4.7K
10/16
LINE OUT
3.3K
3.3K
10/16
Brr
47/16
LINE IN
10/16
0.35mVrms
1K-70mVrms
10/16
10/16
GND
4.7/16
MUTE IN From u-COM
VCC
3V (5mA) HEAD SW
MIXER OUT
10/16
10/16
TAPE OUT
FOR RECORDING
TAPE OUT
FOR PLAY OUT
A-IN-1
B-IN-1
A-IN-2
B-IN-2
3.3K
12K
10K
10/16
0.012
47/16
82
10/16
10/16
10/16
10/16
0.012
47/16
82
10K
12K
10/16
FOR PLAY OUT
TAPE OUT
+
10/16
3.3K
60K
47/16
:HIGH>3V
:LOW<1V
HIGH=A/OPEN OR GND=B
:HIGH>3V, :LOW<1V
HIGH=REC/OPEN OR
from u-COM
A/B SW
from u-COM
R/P SW
GND-PB
LOW=Cro2B/OPEN OR
HIGH OFF
from u-COM
Cro2B SW
LOW=Cro2A/OPEN OR
HIGH OFF
from u-COM
Cro2A SW
20K/SVR
to ADJUST
OPEN OR HIGH=NORMAL SPEED/SHORT/GND
HIGH SPEED
REC MODE ONLY
10/16
0.35mVrms
1K-70mVrms
10/16
10/16
+
3.3K
3.3K
MPX
LINE OUT
10/16
4.7K
CL
10/16
10/16
CL
REC IN
HIGH-METAL
HIGH-Cro2
HIGH-NORMAL
NORMAL-METAL
NORMAL-Cro2
NORMAL-NORMAL
HIGH IMPEDENCE-INACTIVE
LOW (GND)-ACTIVE
from u-COM
TAPE OUT
FOR RECORDING
LINE IN
REC OUT
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