CXA1498S/M Recording/Playback Equalizer Amplifier for Stereo Tape Recorder Description The CXA1498S/M is a bipolar IC designed as equalizer amplifier for tape redorder recording/ playback. This IC is particularly well-suited for double cassette deck applications. An on-chip filter serves to greatly reduce the number of external parts. CXA1498M 30 pin SOP (Plastic) CXA1498S 30 pin SDIP (Plastic) Features • Recording equalizer amplifier × 2 (Monolithic filter eliminates the need for external resonance circuit) • AGC (automatic gain control) × 2 • Playback equalizer amplifier × 2 (Variable resistor eliminates the need for external feedback resistor) • Electronic switch for playback head (Changes between A and B decks) • Electronic switch for tape equalization (120µs/70µs) (Independently for A and B decks) • Electronic switch for metal tapes • Electronic switch for normal/high speed dubbing (Effective for both REC EQ and PB EQ) • Recording mute function (Soft mute is possible through use of an external time constant circuit) • DC controllable for fade IN/OUT (Controls recording mute function) • Playback mixing output pin provided (For tune selection) • Use of this IC simplifies the construction of double cassette dubbing system Applications Recording/playback equalizer amplifier, playback mixing amplifier and AGC for analog stereo tape recorders Structure Bipolar silicon monolithic IC Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC 12 • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD SDIP 930 SOP 630 mW mW Recommended Operating Condition Supply voltage VCC 4.5 to 10.0 V V °C °C 25 RFS 20 VG PB EQ CONTROL DECK- B PB 17 VCC MUTE CONT VGS REC EQ AGC DET BIAS & I REF DECK- B PB REC EQ REC EQ CONTROL GND 9 METAL 10 AGC TC AGC 11 12 REC IN 13 GND 14 GND 8 REC IN (L) PB OUT (L) DECK -B EQ SPEED 7 AGC (L) PB FB2 (L) I REF AGC TC PB FB1 (L) 6 METAL PB IN2 (L) MS OUT DECK B EQ 5 SPEED 4 I REF 3 PB IN1 (L) PB OUT 2 MS OUT 100k PB FB2 PB FB1 1 REC OUT 15 REC OUT (L) 210k PB IN2 16 REC OUT VCC DECK- A PB IN1 REC OUT (R) VCC 18 REC IN 30k DECK- A DECK A/B 19 AGC 30k VG REC MUTE DECK A EQ DECK A/B RFC 23 21 22 24 RFC DECK DECK REC A/B -A EQ MUTE 210k DECK A/B REC IN (R) 26 PB OUT AGC (R) 27 30 28 29 PB IN1 PB IN2 PB FB1 PB FB2 100k RFS PB FB2 (R) PB FB1 (R) PB IN2 (R) PB IN1 (R) PB OUT (R) Block Diagram and Pin Configuration (Top View) Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E91860C49-ST CXA1498S/M Pin Description and Equivalent Circuit Pin No. Symbol (Ta = 25°C, VCC = 8V, no signal) DC I/O I/O voltage resistance Equivalent circuit VCC 1 2 29 30 PBIN1 L PBIN2 L PBIN2 R PBIN1 R RFS ×6 0V∗1 I 1 — Description 147 ×6 Playback equalizer amplifier input pins. ×2 2 29 30 GND VCC VCC 3 28 PBFB1 L PBFB1 R 0.8V∗1 — 10p 68kΩ RFS 7k ×3 10p 500 147 ×5 147 3 ×6 28 5 26 PBOUT L PBOUT R 2.5V∗1 O 500 ×6 ×6 147Ω — Playback equalizer amplifier output pins. 5 RFS ×5 Connection pins for the capacitor that determines the playback equalizer amplifier's time constant (120µs, 70µs, etc.) ×5 7k 4 — 26 10k To 26 147 2.5V∗1 10k 100k VCC PBFB2 L PBFB2 R 5 210k ×4 GND 4 27 Playback equalizer amplifier negative feedback pins. VCC 27 GND VCC VCC ×2 6 MS OUT 2.5V∗1 147 O 147Ω 6 500 ×4 GND –2– 500 5k Mixed output pin for the L and R outputs of the playback equalizer amplifier. CXA1498S/M Pin No. Symbol DC I/O I/O voltage resistance Equivalent circuit Description VCC VCC Recording/playback equalizer reference current setting pin. ×2 7 I REF 1.2V — — 7 147 5p GND GND 8 9 SPEED Tape speed switching pin. High: high speed Low: normal speed B EQ B deck equalizer switching pin. High: 70µs EQ Low: 120µs EQ VCC VCC 8 9 10 METAL — I B deck metal tape switching pin. High: metal tape Low: normal or CrO2 tape 147 10 — 22 23 22 23 A EQ A deck equalizer switching pin. High: 70µs EQ Low: 120µs EQ GND A deck/B deck playback switching pin. High: PBIN2 Low: PBIN1 DECK AB VCC VCC ×2 ×2 200 11 AGC TC 0V — — 500 ×2 11 147 ×4 500 100k GND –3– 200 Connection pin for the resistance and capacitor that determines the AGC attack recovery time constant. CXA1498S/M Pin No. Symbol DC I/O I/O voltage resistance Equivalent circuit Description VCC VCC AGC pins for varying the input resistance according to the input signal level over a range from 100kΩ to several 10Ω. 12 12 19 AGC_L AGC_R 19 4V I/O 100kΩ 200 VGS 100k 5k ×4 GND 200 VCC 10k VCC VGS 13 18 RECIN L RECIN R 1.8k 50k 4V I 13 50kΩ 5p 147 18 Recording equalizer amplifier input pins. 24k GND 14 GND 0V — GND 14 — VCC Ground pin. VCC 5p 40k ×3 15 16 RECOUT L RECOUT R 4V O 147Ω Recording equalizer amplifier output pins. 500 147 15 500 16 VG × 10 GND 17 VCC 8V — — VCC 4V — 15kΩ ×2 500 147 VG VCC 3p 30k 20 Power supply voltage pin. VCC 17 20 500 30k ×4 GND –4– To each VGS Connection pin for the capacitor that eliminates ripple at the signal reference voltage. CXA1498S/M Pin No. Symbol DC I/O I/O voltage resistance Equivalent circuit VCC VCC 147 21 MUTE — I — Description 20k 21 20k ×3 ×3 2V Recording mute control pin. Permits soft mute by connecting an external CR time constant circuit. GND VCC 24 RFC 8V∗2 — — VCC VCC 147 24 × 250 25 Connection pin for the resistance and capacitor used for generating stable voltage by eliminating ripple from the power supply voltage. To each RFS 25 RFS 7.2V∗2 O — GND Stable voltage output pin. ∗1 The values of DC voltage require connection of bias resistance between GND and Pins 1, 2, 29 and 30, respectively. ∗2 The values of DC voltage require connection of a resistance between Pin 24 and VCC, and a capacitor between Pin 24 and GND for eliminating ripple, respectively. –5– CXA1498S/M Electrical Characteristics Item Recording equalizer amplifier Symbol Conditions∗ Min. Typ. Max. Unit Operating voltage Vopr Single power supply 4.5 8.0 10.0 V Current consumption ICC NORM/120µs-NORM, No signal 7.0 11.5 15.5 mA Reference input level VIN NORM-NORM, 315Hz –34.5 –33.0 –31.5 dBm Reference output level VOUT NORM-NORM, 315Hz — –6.0 — dBm S/N ratio (NORM-NORM) SN (A-WTG) Rg = 5kΩ, “A”-WTG filter 60.0 63.5 — dB Signal handling SH RL = 2.7kΩ, 1kHz, THD = 1% 8.0 10.0 — dB Total harmonic distortion THD RL = 2.7kΩ, 1kHz, 0dB — 0.19 0.5 % Output offset voltage VOFF NORM-NORM 3.8 4.13 4.5 V FNN-1 3kHz, –20dB –1.6 –0.4 0.8 dB FNN-2 8kHz, –20dB 2.4 3.9 5.4 dB FNN-3 12kHz, –20dB 6.4 8.9 11.4 dB FCN-1 3kHz, –20dB 3.4 4.6 5.8 dB FCN-2 8kHz, –20dB 6.1 7.6 9.1 dB FCN-3 12kHz, –20dB 9.4 11.4 13.4 dB FMN-1 3kHz, –20dB 3.2 4.4 5.6 dB FMN-2 8kHz, –20dB 5.1 6.6 8.1 dB FMN-3 12kHz, –20dB 7.6 9.6 11.6 dB FNH-1 5kHz, –20dB –1.4 –0.2 1.0 dB FNH-2 15kHz, –20dB 3.9 5.7 7.5 dB FNH-3 20kHz, –20dB 7.0 9.5 12.0 dB FCH-1 5kHz, –20dB 3.1 4.3 5.5 dB FCH-2 15kHz, –20dB 7.6 9.4 11.2 dB FCH-3 20kHz, –20dB 10.3 12.8 15.3 dB FMH-1 5kHz, –20dB 3.7 4.9 6.1 dB FMH-2 15kHz, –20dB 7.7 9.2 10.7 dB FMH-3 20kHz, –20dB 9.8 12.3 14.8 dB Recording mute ratio MT-1 NORM-NORM, 1kHz, +8dB — –85.0 –80.0 dB Recording mute characteristics MT-2 NORM-NORM, 1kHz, 2.0V (pin voltage) –8.0 –6.0 –4.0 dB AGC level AGC-L RIN = 10kΩ, 1kHz, –25dBm –31.0 –29.0 –27.0 dBm Channel balance AGC-B RIN = 10kΩ, 1kHz, –15dBm –2.0 0.0 2.0 dB AGC distortion THD-A RIN = 10kΩ, 1kHz, 0.0dBm — 0.8 1.5 % NORM-NORM mode frequency characteristics CrO2-NORM mode frequency characteristics METAL-NORM mode frequency characteristics NORM-HIGH mode frequency characteristics CrO2-HIGH mode frequency characteristics METAL-HIGH mode frequency characteristics AGC (Ta = 25°C, VCC = 8.0V) –6– For NORMNORM at 315Hz –20dB For NORMNORM at 315Hz –20dB For NORMNORM at 315Hz –20dB For NORMNORM at 315Hz –20dB For NORMNORM at 315Hz –20dB For NORMNORM at 315Hz –20dB CXA1498S/M Item 120µs-NORM mode frequency characteristics Conditions∗ Symbol Min. Typ. Max. Unit PB-REF 315Hz, -70dBm, Frequency characteristics standard (0dB) –27.0 –25.0 –23.0 dBm F120-N For 2.7kHz, –58.5dBm, at 315Hz –1.5 0.0 1.5 dB For 4.5kHz, –53.8dBm, at 315Hz –1.2 0.3 1.8 dB 70µs-NORM frequency F70-N F120-H For 5.3kHz, –52.5dBm, at 315Hz 0.7 2.2 3.7 dB 70µs-HIGH frequency F70-H For 9.1kHz, –47.8dBm, at 315Hz 1.1 2.6 4.1 dB Signal handling SH RL = 2.7kΩ, 1kHz, THD = 1% –10.0 –3.0 — dBm Total harmonic distortion THD RL = 2.7kΩ, 1kHz, –52dBm — 0.19 0.5 % S/N ratio (120µs-NORM) SN (A-WTG) Rg = 2.2kΩ, “A”-WTG filter 55.0 60.0 — dB Output offset voltage VOFF 2.2 2.5 2.8 V DC feedback resistance RFB 150 210 270 kΩ Input bias resistance RIN — 0.3 1.0 µA MIX output voltage V-MIX –1.5 0.0 1.5 dB Ripple filter output current RFIO 10.0 — — mA Control voltage “High” level VCH Threshold voltage of mode control pin 2.5 — VCC V Control voltage “Low” level VCL Threshold voltage of mode control pin GND — 1.0 V Playback equalizer amplifier 120µs-HIGH frequency 120µs-NORM, Rg = 100kΩ 120µs-NORM, 2.7kHz, –52dBm ∗ NORM-NORM = NORMAL Tape, NORMAL Speed CrO2-NORM = CrO2 Tape, NORMAL Speed NORM-HIGH = NORMAL Tape, HIGH Speed CrO2-HIGH = CrO2 Tape, HIGH Speed METAL-HIGH = METAL Tape, HIGH Speed 120µs-HIGH = EQ: 120µs, HIGH Speed 70µs-HIGH = EQ: 70µs, HIGH Speed METAL-NORM = METAL Tape, NORMAL Speed 120µs-NORM = EQ: 120µs, NORMAL Speed 70µs-NORM = EQ: 70µs, NORMAL Speed –7– GND Power Supply S1 S3 1 S5 R10 680kR8 100k C1 4.7µ/25V 2 PB IN2 (L) C3 4.7µ/25V S7 C5 100µ 25V R14 180 C7 0.015µ C11 4.7µ 25V S9 S11 4 PB FB1 (L) C9 4.7µ 25V 6 5 PB FB2 (L) 3 I REF 7 CXA1498S/M SPEED R25 1k S13 TAPE SPEED 8 C13 1µ/25V S15 DECK B EQ 9 METAL 10 S17 METAL 11 12 S19 13 S21 C25 2.2µ 25V S35 S31 S30 S29 S28 S27 S25 R47 2.7k R51 100 S32 S33 R52 S34 100 R48 2.7k S26 R41 R49 R42 R50 10k 100 10k 100 S23 R43 10k C28 4.7µ 25V 15 14 16 17 18 19 20 21 22 C29 4.7µ 25V 23 C26 2.2µ 25V R44 10k 24 PB OUT (L) R12 2.2k PB IN1 (L) R6 680k MS OUT R17 2.7k GND S24 25 R27 1k DECK-B EQ C15 1µ/25V R1 620 S22 26 R30 1k Audio SG S20 27 C10 4.7µ 25V S12 C17 1µ/25V S39 S37 S36 R45 R53 R46 10k 100 10k S40 28 R15 180 C8 0.015µ S10 R32 1.1k 29 C6 100µ 25V S18 REC MUTE PB IN1 (R) S8 S16 DECK A EQ PB IN2 (R) R7 680k PB FB1 (R) 30 C2 4.7µ/25V PB FB2 (R) R34 300k DC A Ammeter C4 4.7µ/25V PB OUT (R) R13 2.2k RFS R9 100k R11 680k S6 R18 2.7k S4 R24 10k RFC R20 2.7k DECK A/B R35 10k C21 10µ/25V AGC TC C20 10µ/25V AGC (L) C23 4.7µ/25V REC IN (L) R37 62k S2 C12 100µ/25V DECK-A EQ R26 1k DC 5V Supply R21 470 S14 DECK A/B C14 1µ/25V REC MUTE R28 1k R19 R22 2.4k 2.4k C16 1µ/25V R16 5.6k C18 1µ/25V VG C19 47µ/25V AGC (R) R31 1k R33 6.2k R36 10k R29 3k C22 10µ/25V REC IN (R) R38 62k VCC R23 27k R3 2.2k R2 2.2k R40 5.1k REC OUT REC OUT (R) (L) GND –8– R39 5.1k R5 100k R4 100k C27 100µ/25V Electrical Characteristics Test Circuit 0dB or 30dB S45 Oscillo -scope Distortion Analyzer AC Voltmeter S41 Noise Filter 1kHz BPF DIN Audio "A" WTG GND R54 50k Amp DC Voltmeter S42 S43 S44 CXA1498S/M C4 0.015µ PB Only HEAD (DECK-A) 1 PB IN2 GND PB IN1 2 C1 100µ C3 0.015µ 100k PB FB2 GND R1 180 3 210k DECK- B PB DECK- A DECK- A DECK- B PB PB FB1 DECK A/B DECK A/B 210k 4 27 30 28 29 PB IN1 PB IN2 PB FB1 PB FB2 100k R2 180 C5 4.7µ PB OUT 5 26 PB OUT C7 4.7µ MS OUT RFS 6 25 7 SPEED 8 DECK -B EQ GND 9 GND AGC TC VGS MUTE CONT METAL 10 REC EQ CONTROL PB EQ CONTROL 20 11 30k VG C16 47µ GND AGC GND GND C19 10µ 13 R16 5.6k VCC 16 REC OUT GND C21 2.2µ GND 14 GND GND GND REC OUT 15 REC EQ REC EQ VCC 17 VCC C22 2.2µ R18 22k REC IN R14 22k 12 GND R19 22k R17 5.6k 18 REC IN AGC DET 19 AGC 30k C20 10µ R15 22k from Dolby NR IC Dolby NR IC (RECOUT) C26 2.2µ C27 2.2µ C30 150p L1 12mH C32 180p REC REC GND REC/PB GND PB R20 10k C28 820p Bias OSC L2 12mH C29 C33 820p 180p R21 10k C31 150p GND PB REC/PB GND REC/PB HEAD (DECK-B) REC/PB HEAD (DECK-B) Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. GND GND R3 27k I REF C8 100µ GND REC MUTE 23 21 22 REC DECK DECK MUTE A/B -A EQ BIAS & I REF 24 R4 10k RFC C10 4.7µ C9 4.7µ C6 4.7µ R5 10k C2 100µ C11 4.7µ PB Only HEAD (DECK-A) R6 10k GND C12 4.7µ GND DECK A/B SPEED VCC R8 10k R7 10k GND C14 4.7µ C13 4.7µ GND DECK-A EQ DECK-B EQ Filter OUT to AMS R10 10k R9 10k GND C17 4.7µ to Dolby NR IC Dolby NR IC (PB IN) to Dolby NR IC Dolby NR IC (PB IN) C15 47µ METAL (METAL/METAL) R11 1M C18 4.7µ to Dolby NR IC Dolby NR IC (REC IN) R13 10k LINE IN LINE IN R12 10k to Dolby NR IC Dolby NR IC (RECIN) C24 0.47µ C23 0.47µ –9– from Dolby NR IC Dolby NR IC (REC OUT) C25 100µ Application Circuit CXA1498S/M CXA1498S/M Notes on Operation (1) Operation mode control (each mode of recording and playback equalizers) 1: Playback equalizer switching (120µs/70µs) (Pins 9, 22 and 23) DECK B-EQ (Pin 9) DECK A-EQ (Pin 22) DECK A/B (Pin 23) L H L H 120µs (A-DECK) 70µs (A-DECK) Follows B-EQ control. L H Follows A-EQ control. 120µs (B-DECK) 70µs (B-DECK) 2: Normal/double speed switching (Pin 8) Both playback and recording equalizers are switched in normal/double speed switching. ∗ For double speed, both playback and L H SPEED Pin 8 recording systems are switched to Playback EQ Normal speed Double speed double speed characteristics of each Recording EQ Normal speed Double speed setting mode: (PB-EQ: 120µs, 70µs) (REC-EQ: NORMAL, CrO2, METAL) 3: Recording equalizer switching (NORMAL, CrO2, METAL) (Pins 9 and 10) METAL (Pin 10) DECK B-EQ (Pin 9) L H L NORMAL (Type-I) METAL (Type-IV) H CrO2 (Type-II) METAL (Type-IV) (2) Recording mute (REC MUTE: ON/OFF) (Pin 21) The recording mute function of the CXA1498S is controlled by a recording mute circuit to vary the electric volume for recording equalizer amplifier gain by applying the DC voltage to REC MUTE (Pin 21). REC MUTE Recording mute ON Attenuation –6dB Recording mute OFF Control voltage GND ≤ VCL ≤ 0.5V 2.0V 3.5V ≤ VCH ≤ VCC – 10 – CXA1498S/M Recording equalizer vs. Frequency characteristics (Normal speed) 25 0dB = NORM-NS mode 315Hz, –25dBm at Rec Out Response [dB] 20 15 10 METAL-NS 5 CrO2-NS 0 NORM-NS –5 0.125 1.0 10 50 FREQ [kHz] Recording equalizer vs. Frequency characteristics (Double speed) 25 0dB = NORM-NS mode 315Hz, –25dBm at Rec Out Response [dB] 20 15 10 METAL-HS 5 CrO2-HS 0 NORM-HS –5 0.125 1.0 10 50 FREQ [kHz] Playback equalizer vs. Frequency characteristics Gain [dB] 60 120µs-NS 120µs-HS 70µs-NS 70µs-HS 5 dB/ 20 0.050 0.1 1.0 FREQ [kHz] – 11 – 10 20 CXA1498S/M AGC output voltage characteristics –10 AGC OFF –20 –25 AGC ON –30 –35 –35 –30 –25 –20 –15 –10 –5 0 Input level [dBm] AGC total harmonic distortion 1.0 T. H. D + N [%] Output level [dBm] –15 0.1 0.01 –35 –30 –25 –20 –15 –10 –5 Input level [dBm] – 12 – 0 5 5 CXA1498S/M Package Outline Unit: mm CXA1498S + 0.1 05 0.25 – 0. 30PIN SDIP (PLASTIC) 400mil + 0.4 26.9 – 0.1 10.16 + 0.3 8.5 – 0.1 16 30 0° to 15° 15 1 + 0.4 3.7 – 0.1 3.0 MIN 0.5 MIN 1.778 0.5 ± 0.1 0.9 ± 0.15 PACKAGE STRUCTURE EPOXY / PHENOL RESIN MOLDING COMPOUND SONY CODE SDIP-30P-01 LEAD TREATMENT SOLDER PLATING EIAJ CODE SDIP030-P-0400-A LEAD MATERIAL COPPER ALLOY PACKAGE WEIGHT 1.8g JEDEC CODE CXA1498M 30PIN SOP (PLASTIC) 375mil + 0.4 18.8 – 0.1 30 + 0.4 2.3 – 0.05 16 1 0.1 ± 0.1 9.3 15 1.27 0.45 ± 0.1 A 0.5 ± 0.2 10.3 ± 0.4 + 0.3 7.6 – 0.1 0.10 + 0.1 0.2 – 0.05 0° to 10° DETAIL A ± 0.12 M PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SOP-30P-L03 LEAD TREATMENT SOLDER PLATING EIAJ CODE ∗SOP030-P-0375-C LEAD MATERIAL COPPER / 42 ALLOY PACKAGE WEIGHT 0.7g JEDEC CODE – 13 –