ICs for Cassette, Cassette Deck AN7352S Playback Pre-amplifier for Stereo Cassette Deck Unit : mm 0.1±0.1 circuits for playback gain adjustment built-in • Various equalizer switching circuit built-in • Series mute circuit built-in • MS (head locating) amp. comparator circuit built-in 0.3 7.2±0.3 9.4±0.3 17.81±0.3 2.0±0.2 ■ Features • Variable volume 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.15 1.27 The AN7352S is a bipolar IC developed as a playback pre-amplifier of analogue cassette deck. Particularly in order to support the automatic adjustment, it incorporates various volume filter circuits and control functions. Also, it has realized great reduction of external parts required. 0.925 0.4±0.25 0.45 ■ Overview 28-Lead SOP Package (SOP028-P-0375A) ■ Pin Name Pin No. Pin Name Pin No. Pin Name Pin No. Pin Name 1 –VCC 11 Volume Control (R Ch.) 21 P/R LOGIC 2 PB T1 Input (R Ch.) 12 MS Input 22 PB Monitor Output 3 PB T2 Input (R Ch.) 13 +VCC 23 120µ/ 70µ ( × 2) NF SW 4 PB NF Input (R Ch.) 14 MS NF Input 24 120µ/ 70µ ( × 1) NF SW 5 120µ/ 70µ ( × 2) NF SW 15 MS Output 25 PB NF Input (L Ch.) 6 120µ/ 70µ ( × 1) NF SW 16 MS De-coupling 26 PB T2 Input (L Ch.) 7 PB Monitor Output 17 MS GND 27 PB T1 Input (L Ch.) 8 T1/ T2 LOGIC 18 Volume Control (L Ch.) 28 GND 9 120µ/ 70µ LOGIC 19 PB Output (L Ch.) 10 PB Output (R Ch.) 20 × 1/ × 2 LOGIC 18 17 ■ Block Diagram GND 28 27 26 25 24 23 22 21 20 19 × 1/ ×2 P/ R 16 15 CTL 22kΩ 47kΩ – + 1kΩ 1 –VCC 2 3 4 5 6 7 8 + – 120µ/ 70µ 9 CTL 10 11 12 13 +VCC 14 47pF T1/ T2 82kΩ + – ICs for Cassette, Cassette Deck AN7352S ■ Absolute Maximum Ratings (Ta=25˚C) Parameter Symbol Rating VCC ±6.7 ICC (+) 22 ICC (–) 20 mA Power Dissipation PD 702 mW Operating Ambient Temperature Topr –25 ~ + 75 ˚C Storage Temperature Tstg –55 ~ + 150 ˚C Supply Voltage Supply Current Unit V mA ■ Recommended Operating Range (Ta= 25˚C) Parameter Symbol Range Operating Supply Voltage Range VCC ± 4.5V ~ ± 6.5V ■ Electrical Characteristics (VCC= ±6V, Ta=25˚C) Parameter Consumption Current Symbol Itot Condition VCC = ±6V, At no signals Vin = –50dBv, f = 1kHz 30kHz LPF ON, VCNT = 2.5V VCNT = 5V, GH = DATA (2)– DATA (1) Reference Output Level (0dB) V1 Reference Output Level (+ 6dB) GH Reference Output Level (– 6dB) GL Level Difference Between Channels Level Difference Between Tapes DGLR DGT12 Total Harmonics Distortion (0dB) THD11 VCNT = 2.5V, V9/V20 = 0V, V8/V21= 5V Vno VCNT = 2.5V, DIN AUDIO, Rg = 2.2kΩ Output Noise Voltage VCNT = 1.25V, GL = DATA (3) – DATA (1) VCNT = 2.5V, DGLR = V1L– V1R min. max. Unit 11 22 mA 45.4 47.4 49.4 dB +5 +6 +7 dB –7 –6 –5 dB 0 1 dB 0 0.1 1 0.3 dB % –69 –62 dBv dBv VCNT = 2.5V, DGT1T2 = V1T1 –V1T2 VCNT = 2.5V, THD = 3% typ. 9 Maximum Output Level (0dB) Crosstalk Between Channels VOMX CT VCNT = 2.5V, Rg = 220Ω 2 60 Output Offset Voltage (0dB) VOFF VCNT = 2.5V, Rg = 220Ω –230 Muting Attenuation GM0 VCNT = 0V 60 mV dB Muting Attenuation (T1) GM1 VCNT = 2.5V 60 dB Muting Attenuation (T2) GM2 VCNT = 2.5V 60 dB 3.6 dB +130 VCC = ±6V, V15 = 0.3V MS Amp. Section 4kHz Gain (Input Voltage) GMS1 High-Frequency Band Gain (Input Voltage) GMS2 f = 4kHz –51 dBv f = 50kHz –44 dBv VCC = ±4.5V Logic – L Time Constant Switching Pin Voltage V9L 120µs mode 0 1.5 V Tape Switching Pin Voltage V8L T2 mode 0 1.2 V Speed Switching Pin Voltage V20L Double speed ( × 2) mode 0 1.2 V R – P Switching Pin Voltage V21L R mode 0 1.5 V VCC = ±6.5V Logic – H Time Constant Switching Pin Voltage V9H 70µs mode 2.6 5 V Tape Switching Pin Voltage V8H T1 mode 3.1 5 V Speed Switching Pin Voltage V20H Double speed ( × 1) mode 3.1 5 V R – P Switching Pin Voltage V21H P mode 2.6 5 V VCC = ±6V Mute Mute ON Voltage Vmute1 0 0.7 V Mute OFF Voltage Vmute2 1.25 5 V ICs for Cassette, Cassette Deck AN7352S 28 82Ω 27 23 22 5V GND P/ R 20 19 × 1/ ×2 1µF PB OUT 21 + 18 17 10kΩ MS GND 47kΩ 22kΩ 10kΩ 560kΩ 25 24 26 27kΩ 0.0056µF + 680pF 100µF 100kΩ 680pF 100kΩ ■ Application Circuit 16 15 CTL 22kΩ 47kΩ – + 1kΩ + – 120µ/ 70µ 47pF T1/ T2 82kΩ + – CTL –VCC 0.0056µF 11 12 13 14 + 10µF 10 PB OUT 100Ω 9 2.2kΩ 8 47kΩ 7 22kΩ 10kΩ + 6 27kΩ 5 560kΩ 82Ω 100kΩ 100kΩ 4 680pF 3 100µF 2 680pF 1