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 Package S1A0292A01-Q1R0 48−QFP−1010E Operating Temperature Pitch −20°C − +70°C 0.8mm −20°C − +70°C 0.75mm 1 S1A0292A01 PB/REC EQ ST PRE AMP LINE OUT REC NF REC IN LOW CAP GL GM REC OUT AGND 2 FEC OUT F/Q FQ GP LOW CAP REC IN BLOCK DIAGRAM 48 47 46 45 44 43 42 41 40 39 38 37 EQ & REC AMP EQ & REC AMP 1 − + 2 36 LINE OUT 35 REC NF 34 LINE IN 33 ALC NF2 32 DUB SW 31 IREF 30 Cro2A SW 29 Cro2B SW 28 R/P SW 27 A/B SW 26 FIL CAP 25 PB OUT2 1.1V LINE IN 3 ALC NF1 4 REC R/R 5 V/2 PR 6 ALC R/R 7 MUTE IN 8 Vcc 9 I EQ CONTROL VOLTAGE REGULATOR ALC DETECTOR ALC DRIVER CONTROL • LOGIC HEAD SW 10 10K 6K MIXER OUT 11 + − FILCAP 12 Cro2 + − 300K 2 13 14 15 16 17 18 19 20 21 22 23 24 PBOUT2 CROUT PBOUT NF PLAY AiN BiN AGND1 AIN BIN NF PLAY PB OUT CR OUT 300K Cro2 PB/REC EQ ST PRE AMP S1A0292A01 PIN DESCRIPTION Pin Description Pin No Symbol I/O Description 1 LINE OUT(R) OUTPUT 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 9 VCC VCC 10 HEAD SW OUTPUT Head switching DC output pin 11 MIXER OUT OUTPUT Playback mixer out 12 FILCAP(R) − 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 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) − 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 − CCA (ALC Output) pin Mute Signal ( High Active (Input)) VCC HI-Speed filter capacitor Play GND HI-Speed filter capacitor EQ-BPF-IREF adjust 3 S1A0292A01 PB/REC EQ ST PRE AMP Pin Description (Continued) 4 Pin No Symbol I/O Description 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 37 REC IN(L) INPUT 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 43 AGND2 − 44 REC OUT(R) OUTPUT 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 CCA out Record input pin Record output pin REC gnd Record output pin Record input pin PB/REC EQ ST PRE AMP S1A0292A01 ABSOLUTE MAXIMUM RATING (Ta = 25°C) Characteristic Symbol Value Unit VCCQ 12 V PD 500 mW Operating temperature TOPR −20 − +70 °C Storage temperature TSTG −50 − +125 °C Supply voltage Power dissipation ELECTRICAL CHARACTERISTICS (VCC = 9V, f = 1kHz, unless otherwise specified) Characteristic PLAYBACK Quiescent circuit curent ALC Min. Typ. Max. Unit 25 30 40 mA 37 40 43 dB 0.7 1 − Vrms VO = 0dBm − 0.1 0.5 % CT1 VSG = −40dBm 40 55 − dB ATTMUTE1 VSG = −40dBm 55 70 − dB ICC Closed Loop Voltage Gain GVC Maximum Output Voltage VOI Total Harmonic Distortion THD1 Cross Talk Muting Attenuation RECORD Symbol Test conditions REC MODE, VI = 0 − THD = 1% 0.71Vrms ALC Voltage VOCALCY VSG = −20dB 28 35 45 mVrms ALC Distortion THDALC VSG = −20dB − 0.3 1 % ALC Range VALC THD = 1% point up 25 32 − dB EQ Low frequency Gain EGH f = 50Hz/ − 40dB 29 33 37 dB EQ Mid Frequency Gain EGM f = 500Hz/ − 40dB 21 25 29 dB EQ Peak Frequency Gain EQP f = variable/ − 40dB 35 41 46 dB Maximum, Output Voltage VO2 THD = 1% 1 2 − Vrms Record Switch Voltage Total Harmonic Distortion Cross Talk Muting Attenuation – REC MODE 2.4 3.5 − V THD2 VO = 0dBm − 0.5 1 % VSG = −40dBm 40 50 − dB VSG = −40dB 55 70 − dB CT2 ATTMUTE2 5 S1A0292A01 PB/REC EQ ST PRE AMP TEST CIRCUIT RGM 20.6K 10/16 + VSG7 RF/Q 127K 2K +TA42 10/16 2K TA43 +10/16 RFQ 33K CL 0.01µ RGF 11K + RGL 1.3K CL 0.01µ 10/16 2K + − VSG6 2K + − 48 47 46 45 44 43 42 41 40 39 38 37 EQ & REC AMP EQ & REC AMP TA1 10/16 1K + 10/16 1 2 1.1V VSG9 2K + 34 4 10/16 + + 10/16 2K 33 10/16 32 VOLTAGE ALC DETECTOR ALC DRIVER REGULATOR + 10/16 6 + 22/16 7 30 SW7 MUTE =HIGH ACTIVE CONTROL • LOGIC 8 29 5V 9 Vcc CURRENT METER DVM 28 Vcc 10 27 10K TA11 + 10/16 + 0.01µ 10K 11 10K 10K 12 6K 6K + − 300K Cro2 N N SW6 for ADJUST 20K/SVR SW4 A-DECK Cro2=SHORT SW3 B-DECK Cro2=SHORT SW2 SW1 5V REC=SHORT PB=OPEN 5V A=SHORT B=OPEN 26 0.01UF 25 + − Cro2 300K 13 14 + 16 10K 17 10/16 18 + 10/16 19 + 20 10/16 + 21 10/16 22 + 1/16 23 10K 2K 1/16 10K TA15 10K 10K 2K 2K 100 + 10/16 10/16 100 + − VSG1 + − + − VSG2 VSG3 2K VSG4 10/16 + 100 + − + + 10/16 10/16 +TA23 100 10K 6 24 TA13 + 10/16 15 10K VSGS NORMAL SPEED-OPEN HI-SPEED=SHORT 31 2MEG + − 10/16 EQ CONTROL 5 1K + 10/16 35 I 3 TA36 10/16 − + 10/16 + − + 36 TA25 10K 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 1.5V B-off 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 7 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 Gain RM3 * CL 1 ALPF = f RM3 * CL S+ 8800 RGL 1 RM3 * CL RM3 = 10 K, fp = 1 2*πRM3 * CL , CL = external constant 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 S , CF/Q K2GF/QGFQ S + CF/Q S + C F/QCFQ ωO = 2 G1 = 2RIREF 4.4 1 , , GF/Q = RGP 15K * RF/Q , GFQ = K1 = 40e4 , K2 = 1 , CF/QCFQ CF/QCFQ , Q = CF/G CF/Q CF/QCFQ , GPF = K1G1 RIREF 1 , 15K * RF/Q GF/Q = 160pF , CF/Q = 70pF 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 8 PB/REC EQ ST PRE AMP INPUT S1A0292A01 AHPF ALPF K1 BPF + K4 + K5 OUTPUT 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. + B Point A is pin 2 and pin 35, B is pin 44 and pin 42. K5, close loop gain, is R/Rrr. - 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 9 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 10 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 Level DETECTOR 1V PEAK DETECT R2 R1 R1=20K R2=1K GV=R1/R2 PIN4 or PIN33 The ALC out level, LINE OUT level is defined as ALC OUT = 1 •2• GV 1 2 2 = 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 R1 N.F X1 10K R5 R2 C1 CBOUT -1 PB OUT-2 R6 6K REC DUBING FILCAP C2 CROUT 47uF R4 R3 HNAB(S) = 1 S + RZC1 1 S + (R 1+RZ)C1 GPB(S) = HNAB(S) * R1 RZ (R1+RZ )R4 RZ = R2/R3: Cro MODE RZ : NORMAL MODE 1 R4 ≅ HNB(S) * G fp fp = 12 1 2*π*(R1 + RZ)*C1 fz Freq. fz = 1 2*π*RZ C 1 RZ R4 PB/REC EQ ST PRE AMP S1A0292A01 2) High speed dubbings cutting function is defined R5, R6, C2 gain t1 HI(S) = t2 R6 R5 + R 6 S+ X S+ 1 C2 R6 1 C2(R5 + R 6) frequency 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 HIGH IMPEDENCE-INACTIVE LOW (GND)-ACTIVE REC OUT REC IN REC IN 4.7K 10/16 LINE OUT 4.7K CL 48 3.3K + 10/16 + 10/16 + 47 46 45 44 43 42 CL 41 40 39 38 + 10/16 37 LINE OUT 3.3K MPX MPX EQ & REC AMP 3.3K + Brr − + 2 LINE IN I 34 + 33 EQ CONTROL 10/16 + OPEN OR HIGH=NORMAL SPEED/SHORT/GND HIGH SPEED 5 VOLTAGE 10/16 ALC DETECTOR ALC DRIVER REGULATOR + GND 32 REC MODE ONLY 6 + 10/16 7 MUTE IN From u-COM 20K/SVR to ADJUST 31 30 4.7/16 CONTROL • LOGIC 8 LOW=Cro2B/OPEN OR HIGH OFF 29 HIGH=REC/OPEN OR GND-PB :HIGH>3V, :LOW<1V VCC 9 28 Vcc 3V (5mA) HEAD SW 10 27 + 10K 11 10K 10K 12 6K 10K 10/16 6K + − 300K Cro2 N N from u-COM Cro2A SW LOW=Cro2A/OPEN OR HIGH OFF from u-COM Cro2B SW from u-COM R/P SW from u-COM HIGH=A/OPEN OR GND=B A/B SW + :HIGH>3V 60K :LOW<1V 26 47/16 + + LINE IN 4 10/16 MIXER OUT 0.35mVrms 1K-70mVrms 10/16 1.1V 3 0.35mVrms 1K-70mVrms 10/16 35 47/16 3.3K + 36 + + EQ & REC AMP 1 10/16 25 10/16 + − Cro2 3.3K TAPE OUT FOR RECORDING 300K TAPE OUT TAPE OUT FOR RECORDING FOR PLAY OUT 14 + 10/16 3.3K 12K 15 16 10K + 0.012 10/16 + 47/16 82 A-IN-1 B-IN-1 A-IN-2 B-IN-2 14 17 18 + 10/16 19 20 21 + + + 10/16 10/16 10/16 22 23 10K + 0.012 47/16 82 24 12K + 13 10/16 FOR PLAY OUT TAPE OUT