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PB/REC EQ ST PRE AMP
S1A0292A01
INTRODUCTION
The S1A0292A01 is a monolithic integrated circuit consisting of a playback and record processing stereo amplifier, which is suitable for an audio system. 48-QFP-1010E
FEATURES
* * * * * * * 2CH Double input playback amplifier 2CH Recording Amplifier Bulit-in Recording Equalizer Tape selector ALC circuit Mute circuit Operating voltage (VCC = 6V - 12V)
ORDERING INFORMATION
Device S1A0292A01-Q1R0
Package 48-QFP-1010E
Operating Temperature -20C - +70C -20C - +70C
Pitch 0.8mm 0.75mm
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S1A0292A01
PB/REC EQ ST PRE AMP
BLOCK DIAGRAM
LOW CAP
LOW CAP
REC OUT
FEC OUT
AGND 2
REC IN
48
47
46
45
44
43
42
41
40
39
38
37
LINE OUT REC NF LINE IN ALC NF1 REC R/R V/2 PR ALC R/R MUTE IN Vcc
1 2 3 4 5 6 7 8 9
EQ & REC AMP
- +
EQ & REC AMP 36 35 1.1V
I
REC IN
F/Q
GM
GP
FQ
GL
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
34 33 32 31 30
EQ CONTROL VOLTAGE REGULATOR ALC DETECTOR ALC DRIVER
CONTROL * LOGIC
29 28 27 10K 6K 26
HEAD SW 10 MIXER OUT 11 FILCAP 12 Cro2
+ -
25
+ -
300K
300K Cro2 23 PB OUT 24 CR OUT
13 PBOUT2
14 CROUT
15 PBOUT
16 NF PLAY
17 AiN
18 BiN
19 AGND1
20 AIN
21 BIN
22 NF PLAY
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PB/REC EQ ST PRE AMP
S1A0292A01
PIN DESCRIPTION
Pin Description Pin No 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 29 30 31 Symbol LINE OUT(R) NF REC LINE IN(R) ALC NF1 REC R/R VCC/2 R/R ALC R/R MUTE IN VCC HEAD SW MIXER OUT FILCAP(R) PB OUT-2(R) CROUT(R) PB OUT-1(R) NF PLAY A-IN(R) B-IN(R) AGND 1 A-IN(L) B-IN(L) NF PLAY(L) PB OUT-1 (L) CROUT-2 (L) PB OUT-2 (L) FILC AP (L) A.B-SW R/P-SW Cro2B-SW Cro2B-SW IREF I/O OUTPUT INPUT INPUT INPUT - - - INPUT VCC OUTPUT OUTPUT - OUTPUT OUTPUT OUTPUT INPUT INPUT INPUT GND INPUT INPUT INPUT OUTPUT OUTPUT OUTPUT - INPUT INPUT INPUT INPUT - Description CCA (ALC Output) pin Record amp feedback pin Line input pin ALC Amp feedback pin Record ripple reject pin Voltage reference ripple filter ALC time constant Mute Signal ( High Active (Input)) VCC Head switching DC output pin Playback mixer out HI-Speed filter capacitor Playback output (for copy) Playback Cro2 feedback output Playback tape out Playback feedback input pin Playback A-Deck input pin Playback B-Deck input pin Play GND Playback A-Deck input pin Playback B-Deck input pin Playback feedback input pin Playback tape out Playback Cro2 feedback output Playback output (for copy) HI-Speed filter capacitor A-Deck (High Active) switch Record (High Active) switch Cro2-B-Deck (high active) switch Cro2-A-Deck (high active) switch EQ-BPF-IREF adjust
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S1A0292A01
PB/REC EQ ST PRE AMP
Pin Description (Continued) Pin No 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol DUB-SW ALC IN(L) LINE IN(L) NF REC LIN OUT(L) REC IN(L) LOWCAP(L) GP FQ F/Q REC OUT(L) AGND2 REC OUT(R) GM GL LOWCAP(R) REC IN(R) I/O INPUT INPUT INPUT INPUT OUTPUT INPUT - - - - OUTPUT - OUTPUT - - - INPUT Description Normal (open) hi-speed (short) ALC amp feedback pin Line input pin Record amp feedback pin CCA out Record input pin REC equalizer low point capacitor REC equalizer gain control pin REC equalizer q point control pin REC equalizer q & bw control pin Record output pin REC gnd Record output pin REC equalizer mid-gain control pin REC equalizer low-gain control pin REC equalizer low point capacitor Record input pin
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PB/REC EQ ST PRE AMP
S1A0292A01
ABSOLUTE MAXIMUM RATING (Ta = 25C)
Characteristic Supply voltage Power dissipation Operating temperature Storage temperature Symbol VCCQ PD TOPR TSTG Value 12 500 -20 - +70 -50 - +125 Unit V mW C C
ELECTRICAL CHARACTERISTICS
(VCC = 9V, f = 1kHz, unless otherwise specified) Characteristic Quiescent circuit curent Closed Loop Voltage Gain PLAYBACK Maximum Output Voltage Total Harmonic Distortion Cross Talk Muting Attenuation ALC Voltage ALC ALC Distortion ALC Range EQ Low frequency Gain EQ Mid Frequency Gain EQ Peak Frequency Gain RECORD Maximum, Output Voltage Record Switch Voltage Total Harmonic Distortion Cross Talk Muting Attenuation Symbol ICC GVC VOI THD1 CT1 ATTMUTE1 VOCALCY THDALC VALC EGH EGM EQP VO2 - THD2 CT2 ATTMUTE2 Test conditions REC MODE, VI = 0 - THD = 1% 0.71Vrms VO = 0dBm VSG = -40dBm VSG = -40dBm VSG = -20dB VSG = -20dB THD = 1% point up f = 50Hz/ - 40dB f = 500Hz/ - 40dB f = variable/ - 40dB THD = 1% REC MODE VO = 0dBm VSG = -40dBm VSG = -40dB Min. 25 37 0.7 - 40 55 28 - 25 29 21 35 1 2.4 - 40 55 Typ. 30 40 1 0.1 55 70 35 0.3 32 33 25 41 2 3.5 0.5 50 70 Max. 40 43 - 0.5 - - 45 1 - 37 29 46 - - 1 - - Unit mA dB Vrms % dB dB mVrms % dB dB dB dB Vrms V % dB dB
5
S1A0292A01
PB/REC EQ ST PRE AMP
TEST CIRCUIT
CL 0.01 10/16 + VSG7
+ -
RGL 1.3K
RGM 20.6K 2K TA43 + 10/16 2K +TA42 10/16
RF/Q 127K
RFQ 33K
RGF 11K
CL 0.01 10/16
+
2K
+ -
VSG6
2K 48 47 46 45 44 43 42 41 40 39 38 37
EQ & REC AMP TA1 10/16 1K + 10/16 10/16 VSG9 + 10/16 + 10/16 + 10/16 + 22/16 2MEG SW7
MUTE =HIGH ACTIVE
+ -
EQ & REC AMP 1 2 3 4 EQ CONTROL 5 6 7 8 9 CONTROL * LOGIC
VOLTAGE REGULATOR
36 - + 1.1V I 34 33 32 ALC DETECTOR ALC DRIVER 31 30 29 28 Vcc 27 10K 10K 10K 10K Cro2 NN + - 300K 6K 26 25 + - 300K 13 + 14 10K 15 10K 1/16 + 10/16 TA15 10K 10/16 100 100 + 16 17 10/16
+
+ 10/16 + 10/16 + 10/16 2K
TA36 1K
35
2K
+ -
VSGS
10/16 SW6
NORMAL SPEED-OPEN HI-SPEED=SHORT for ADJUST 20K/SVR
SW4 SW3 SW2 SW1
A-DECK Cro2=SHORT B-DECK Cro2=SHORT REC=SHORT PB=OPEN A=SHORT B=OPEN
5V
Vcc
CURRENT METER
5V 5V
DVM TA11 + 10/16 + 0.01
10 11 12
0.01UF
6K
Cro2 23 10K 24 10K
18 10/16
+
19
20 10/16
+
21 10/16
+
22 1/16
10/16
TA13 2K
+ -
10K
2K 2K VSG1
+ - + -
2K
+ -
+
+
10/16 TA25 10K
100 VSG4
VSG2
VSG3
10/16 10/16 +TA23 100 10K
+
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PB/REC EQ ST PRE AMP
S1A0292A01
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
B-on
A-on
A/B function A-off B-off
1.5V
2.5V
Voltage of pin 27
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 VCC -- Cro2A SWITCH : (A-DECK ONLY) Cro2A PLAY = GND (0 V) Cro2A OFF = OPEN (HIGH INPEDANCE ) OR VCC -- DUBBING SWITCH : NORMAL SPEED TAPE EQUALIZING = OPEN (HIGH IMPEDANCE) OR VCC HIGH SPEED TAPE EQUALIZING = GND (0 V) -- MUTE SWITCH : MUTE ON = HIGH (5 V) MUTE OFF = OPEN (HIGH IMPEDANCE) OR GND
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S1A0292A01
PB/REC EQ ST PRE AMP
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. 22000 S RGM AHPF = S+ 1 RM3 * CL Gain
1 ALPF = RM3 * CL S+ 1 RM3 * CL 1 2*RM3 * CL , CL = external constant 8800 RGL
f
RM3 = 10 K, fp =
Internal part RM3 and external CL are fixed and RGM 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 RGP, RFQ and RF/Q.
K1G1GF/Q ABPF = CF/Q
2
S ,
CF/Q K2GF/QGFQ S+ CF/Q S + C F/QCFQ
O =
CF/QCFQ CF/QCFQ
,
Q = CF/G
CF/Q CF/QCFQ
,
GPF = K1G1
G1 =
2RIREF 4.4 1 , , GF/Q = RGP 15K * RF/Q , GFQ = K2 = 1 ,
RIREF 1 , 15K * RF/Q GF/Q = 160pF , CF/Q = 70pF
K1 = 40e4 ,
We have shown that RIREF is a semi-fixed resistor, which compensates internal capacitors for variations of the fabric process. Constant K is a gain to be fixed but K 5 is variable. Only K5 can be used to adjust the final record gain. GEQ = K5 (K3GBPF + AHPF) K3 = 0.5, K4 = 0.5
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PB/REC EQ ST PRE AMP
S1A0292A01
INPUT
AHPF
ALPF
+
K4
+
K5
OUTPUT
K1
BPF
K3 (Record equalizer block)
If K5 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. K5, close loop gain, is R/Rrr.
+ -
B
A R = 20K
Rrr
We must connect RGP, RF/Q, RGL and RGM to the ground. RGP = PIN39 FQ = PIN40 RF/Q = PIN41 RGM = PIN45 RGL = PIN46 RIREF = PIN31 CL = PIN38, PIN47
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S1A0292A01
PB/REC EQ ST PRE AMP
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).
VOLTAGE REFERENCE 1.2 V generator
+ PIN 45, PIN 44 .... PIN 31, etc.
RGM .... etc....
Method of connection: connect the control pins to ground.
45
44
41
40
39
31
An enabled resistor must be ground connected but others maintain high impedance state.
DECODER (OPEN DRAIN OR OPEN COLLECTOR)
NN
NC
NM
HN
HM
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
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PB/REC EQ ST PRE AMP
S1A0292A01
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.
LINE OUT
LINE IN CCA
+ AMP 1V PEAK DETECT R2 R1 PIN4 or PIN33 R1=20K R2=1K GV=R1/R2 Level DETECTOR
The ALC out level, LINE OUT level is defined as 1 *2* GV 1 2 2
ALC OUT =
= 35 mVrms
To change GV, add a resistor that means at pin 4 or pin 33 as shown.
11
S1A0292A01
PB/REC EQ ST PRE AMP
5. PERIPHERAL OF PLAYBACK AMP 1) NAB elements
A OR B IN
+ A=90dB 300K N.F C1 47uF R4 R3 R1 R2
X1 10K R5 CBOUT -1 CROUT
PB OUT-2 R6 6K REC DUBING FILCAP C2
HNAB(S) =
1 S + RZC1 1 S + (R 1+RZ)C1
R1 RZ (R1+RZ )R4
RZ = R2/R3: Cro MODE RZ : NORMAL MODE 1 R4 HNB(S) * RZ R4
GPB(S) = HNAB(S) *
G
fp
fz
Freq.
fp =
1 2**(R1 + RZ)*C1
fz =
1 2**RZ C 1
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PB/REC EQ ST PRE AMP
S1A0292A01
2) High speed dubbings cutting function is defined R5, R6, C2
gain
t1 HI(S) = t2 frequency R6 R5 + R 6 S+
X 1
C2 R6
1
S+
C2(R5 + R 6)
13
S1A0292A01
PB/REC EQ ST PRE AMP
APPLICATION CIRCUIT
from u-COM NORMAL-NORMAL NORMAL-Cro2 NORMAL-METAL HIGH-NORMAL HIGH-Cro2 HIGH-METAL
REC OUT REC IN 4.7K 10/16 LINE OUT MPX 3.3K + 1 2 3 + 4 EQ CONTROL + 5 + GND 10/16 6 10/16 + 7 MUTE IN From u-COM VCC 9 3V (5mA) HEAD SW 10 + MIXER OUT 10K 11 10K 12 6K Cro2 NN 10/16 10K + - 300K 10K Vcc 4.7/16 8 CONTROL * LOGIC
VOLTAGE REGULATOR
REC OUT
HIGH IMPEDENCE-INACTIVE LOW (GND)-ACTIVE
REC IN
4.7K CL + 48 47 46 45 + 10/16 44 43 + 10/16 42 41 40 39 CL 38 + 37 3.3K MPX EQ & REC AMP 36 - + 1.1V I 34
LINE IN
10/16 LINE OUT 3.3K 10/16 +
3.3K
10/16 + Brr LINE IN 0.35mVrms 1K-70mVrms 47/16
35
+
EQ & REC AMP
10/16
0.35mVrms 1K-70mVrms
33
10/16
10/16 32 REC MODE ONLY 31 30 29 28 27 6K 26 25 + - 300K 10/16 Cro2 23 24 3.3K TAPE OUT FOR RECORDING
20K/SVR to ADJUST LOW=Cro2A/OPEN OR HIGH OFF LOW=Cro2B/OPEN OR HIGH OFF HIGH=REC/OPEN OR GND-PB :HIGH>3V, :LOW<1V from u-COM Cro2A SW from u-COM Cro2B SW from u-COM R/P SW HIGH SPEED
OPEN OR HIGH=NORMAL SPEED/SHORT/GND
ALC DETECTOR ALC DRIVER
from u-COM HIGH=A/OPEN OR GND=B A/B SW + :HIGH>3V 60K :LOW<1V
+
13 TAPE OUT
FOR RECORDING
14
15
16
17
18
19
20
21
22
+ 10/16 3.3K 12K
10K + 0.012 10/16 + 47/16 82
+ 10/16
+ 10/16
+ 10/16
+ 10/16
10K + 0.012 47/16 82
12K TAPE OUT
10/16
A-IN-1 B-IN-1 A-IN-2 B-IN-2
14
+
TAPE OUT
FOR PLAY OUT
+
47/16
FOR PLAY OUT

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