ICs for Cassette, Cassette Deck AN7351K, AN7351SC Dual Pre-Amplifier ICs for Hi-Fi Cassette Deck ■ Overview AN7351K 1. Available for playback amp. tape speed switching 2. Available for rec. amp. mute function 3. Available for playback amp. input and output switching function • Rec. amp. current and voltage both drive output is possible. • Line amp. + mute circuit built-in • Playback equalizer switching built-in • Available for microcomputer direct drive of switching control pin 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 0.5±0.1 0.9±0.25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 36.8±0.3 ■ Features • Available for double deck Unit : mm 1.778 The AN7351K and the AN7351SC are the single chip ICs designed for pre-amp. for stereo cassette (double deck especially) incorporating 2-ch rec./playback/line amp. and muting/switching circuits. 13.7±0.3 0.96±0.25 4.76±0.25 3.3±0.25 + 0.1 5 .0 3 ~ 15˚ 0.3 – 0 15.3±0.25 42-Lead SDIP Package (SDIP042-P-0600A) AN7351SC 0.15 0.3 9.5±0.3 11.5±0.3 21.25±0.3 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 2.0±0.2 0.1±0.1 1.0 0.35±0.1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 0.9 0.45 Unit : mm 42-Lead SOP Package (SSOP042-P-0450) ■ Block Diagram GND 42 41 40 39 38 37 36 35 34 33 32 31 ×1 ×2 SW 30 29 28 27 26 REC. Mute REC. 24 23 22 REC. Ch.2 Ch.2 25 Ch.1 Ch.2 Ch.1 Ch.1 P– B 1 –VCC 2 3 4 5 120/70 SW 6 7 8 9 10 11 T1 Line T2 P– B SW Mute 12 13 CUE Rev. Mute 14 15 16 NC 17 18 19 +VCC 20 21 ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Absolute Maximum Ratings (Ta=25˚C) Symbol Rating Supply Voltage Parameter VCC ±7.2 Supply Current ICC 39 mA PD 1014 * 787 * mW Power Dissipation AN7351K AN7351SC Topr Operating Ambient Temperature Storage Temperature AN7351K V –20 ~ + 75 ˚C –50 ~ + 150 Tstg AN7351SC Unit ˚C –55 ~ + 125 * AN7351K : Rth (j–a)=123.3˚C/W, AN7351SC : Rth (j–a)=127˚C/W ■ Recommended Operating Range (Ta= 25˚C) Parameter Symbol Range Operating Supply Voltage Range VCC ±4.5V ~ ±7V ■ Electrical Characteristics (VCC= ±6V, f=1kHz, Ta=25˚C) Parameter Symbol Condition min. typ. max. Unit <Playback Amp.> RL=20kΩ Total Harmonic Distortion (1) Tape 1 THD (P1) Total Harmonic Distortion (2) Tape 1 THD (P2) Total Harmonic Distortion (3) Tape 2 THD (P3) Total Harmonic Distortion (4) Tape 2 THD (P4) Vi =3.6mV Speed × 1 Feedback Time Constant 120µs Vi =3.6mV Speed × 1 Feedback Time Constant 70µs Vi =3.6mV Speed × 2 Feedback Time Constant 120µs Vi =3.6mV Speed × 2 Feedback Time Constant 70µs Rg =2.2kΩ, DIN/AUDIO, Speed × 1 Feedback Time Constant 120µs Rg =2.2kΩ, DIN/AUDIO, Speed × 1 Feedback Time Constant 120µs Rg =2.2kΩ, DIN/AUDIO, Speed × 1 Feedback Time Constant 120µs Rg =2.2kΩ, DIN/AUDIO, Speed × 1 Feedback Time Constant 120µs 0.04 0.1 % 0.04 0.1 % 0.04 0.1 % 0.04 0.1 % 0.7 1.5 mV 0.7 1.5 mV – 0.9 9 mVP– O – 0.9 9 mVP– O Output Noise Voltage Tape 1 VN (T1) Output Noise Voltage Tape 2 VN (T2) Pulse Noise Voltage Tape 1 VPN (T1) Pulse Noise Voltage Tape 2 VPN (T2) Muting Attenuation Tape 1 RM (T1) Vi =3.6mV 60 dB Muting Attenuation Tape 2 RM (T2) Vi =3.6mV 60 dB Max. Output Voltage Tape 1 VO (T1) THD =3% 3 3.4 Max. Output Voltage Tape 2 VO (T2) THD =3% 3 3.4 Output Offset Voltage Tape 1 VDC (T1) Rg =220Ω –70 70 mV Output Offset Voltage Tape 2 VDC (T2) Rg =220Ω –70 70 mV Crosstalk Tape 1→Tape 2 CT (T1) Vi =3.6mV 60 dB Crosstalk Tape 2→Tape 1 CT (T2) Vi =3.6mV 60 dB Total Harmonic Distortion VOL THD (RV) Vi =200mV 0.03 0.1 % Total Harmonic Distortion CUR THD (RC) Vi =30mV 0.03 0.2 % V V <Rec. Amp> Max. Output Voltage VOL VO (RV) THD =3%, RL =10Ω Max. Output Voltage CUR VO (RC) THD =3%, RL =1Ω Muting Attenuation VOL RM (RV) Vi =200mV Output Noise Voltage CUR VN (RC) Rg =2.2kΩ, DIN/AUDIO Pulse Noise Voltage CUR VPN (RC) Rg =2.2KΩ Output Offset Current CUR IDC (RC) Rg =5KΩ 2.2 3.2 1 1.5 V V dB 75 1 mV –9 9 mVP– O –25 25 µA 0.03 ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Electrical Characteristics (Cont.) (VCC= ±6V, f=1kHz, Ta=25˚C) Parameter Symbol Condition min. typ. max. Unit <Line Amp.> THD (L) Total Harmonic Distortion 3 THD =3% RM (L) Vi =1V, RL =5.1kΩ 80 CUE/REV Distortion RM (C/R) Vi =1V, RL =5.1kΩ 34 Output Noise Voltage VN (L) Muting Attenuation VPN (L) Rg =5kΩ –9 Output Offset Voltage VDC (L) Rg =10kΩ –20 G (L) dB 37 40 dB 0.01 0.03 mV 9 mVP – O 20 mV 0.8 dB 0 1.5 V 0 1.5 V 0 1.45 V 0 1.6 V 0 1.6 V 0 1.6 V 0 1.2 V 34 mA – 0.8 Vi =1V % V 3.6 Rg =5kΩ, DIN/AUDIO Pulse Noise Voltage Voltage Gain 0.07 0.02 Vi =1V VO (L) Max. Output Voltage 0 <Logic> Time Constant Switching Pin Voltage Vt (T1) Time Constant Switching Pin Voltage Vt (T2) Tape Switching Pin Voltage VT1/T2 L/P Mute Pin Voltage VM (L/P) C/R Mute Pin Voltage VM (C/R) Recording Mute Pin Voltage VM (R) Speed Switching Pin Voltage VS (H/L) Pin11 Voltage at 120µs, VCC = 4.5V Pin10 Voltage at 120µs, VCC = 4.5V Pin12 Voltage at T2 Mode, VCC = 4.5V Pin13 Voltage at Mute OFF, VCC = 4.5V Pin15 Voltage at Mute OFF, VCC = 4.5V Pin27 Voltage at Mute OFF, VCC = 4.5V Pin33 Voltage at Double Speed Mode, VCC = 4.5V 8 Itot Current Consumption 18 ■ Application Circuit 20kΩVR 82Ω 20kΩVR To Head 100µF/6V 0.0056µF Tape – 2 L 680 pF 4.7µF 4.7µF G 10 27 22 kΩ kΩ kΩ 560kΩ 2.2 kΩ 2.7kΩ 18kΩ 100kΩ 680pF REC. EQ ×1% × 2– cont. To Head 10µF/16V 2.7kΩ LINE IN 2.2kΩ 18kΩ F 100kΩ 10kΩ VR 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 ×1 ×2 SW R/P Cont.– ,1 R/R Head R REC. REC. Mute Ch.2 Ch.2 Ch.2 T1 Line 120/70 T2 P – B SW SW Mute P– B R/P Cont.– ,1 4 5 6 7 22kΩ 27kΩ 10kΩ 560kΩ 8 Ch.1 CUE Rev Mute 9 10 11 12 13 14 15 16 17 18 19 20 21 NC. 0.47µF 3 4.7µF 2 4.7µF 1 R/R Head R 82Ω 4.7µF 10kΩ 10kΩ 10kΩ 680pF 680 pF BIAS 10kΩ VR Ch.1 Ch.1 Tape –1 L DOLBY REC. 4.7µF 4.7µF 0.0056µF 100µF/6V 20kΩVR 20kΩ VR 4.7µF FG µcom To Amp. ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Pin Descriptions Equivalent Circuit Description Pin No. Pin Name Typ. Waveform 1 Negative Supply Pin DC– 6V 2 Playback Amp. T1 IN (Ch.1) 41 Playback Amp. T1 IN (Ch.2) 2 Playback Amp. T2 IN (Ch.1) 40 DC 0V 3 Playback Amp. T2 IN (Ch.2) 4 Playback Amp. NF IN (Ch.1) Playback amp. Tape1 input 100Ω 3 AC 3.6mV 40 Main circuit –VCC Playback amp. Tape2 input 100kΩ 41 100Ω 4 39 DC 0V 39 Playback Amp. NF IN (Ch.2) 5 120µs/70µs ( × 2) NF switch (Ch.1) Playback amp. negative feedback input DC 0V Output Playback amp. Double-speed equalizer switching 38 120µs/70µs ( × 2) NF switch (Ch.2) 6 120µs/70µs ( × 1) NF switch (Ch.1) 37 120µs/70µs ( × 1) NF switch (Ch.2) 7 Playback Amp. NF OUT (Ch.1) 5 18kΩ 38 AC 1V DC 0V Output Playback amp. Normal speed equalizer switching AC 1V 6 37 – DC 0V 47Ω Amp. Playback amp. negative feedback output 36 Playback Amp. NF OUT (Ch.2) 47Ω 47kΩ 7 AC 1V 36 8 Playback Amp. T1 OUT (Ch.1) +VCC DC 0V Playback amp. Tape 1 output 9 34 35 Playback Amp. T1 OUT (Ch.2) 47Ω 100Ω 35 47Ω 47kΩ 9 Playback Amp. T2 OUT (Ch.1) 34 Playback Amp. T2 OUT (Ch.2) AC 1V Playback amp. Tape 2 output –VCC 8 ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Pin Descriptions (Cont.) Pin Name Pin No. 10 Typ. Waveform Description Equivalent Circuit VCC Tape 2 equalizer switching 70µs – Open 120µs – Low (less than 1.5V ) T2 (120µs/70µs) LOGIC 10 11 11 Tape 1 equalizer switching 70µs – Open 120µs – Low (less than 1.5V ) T1 (120µs/70µs) LOGIC 12 100kΩ VCC Tape 1 and Tape 2 switching T1 – Open T2 – Low (less than 1.5V) T1/T2 LOGIC 12 60kΩ VCC 13 Line amp., PB amp. mute switching Mute ON – Open Mute OFF – Low (less than 1.6V) LINE/PB Amp. Mute LOGIC 27kΩ 13 1kΩ 14 14 LINE Mute TIMING Line mute soft switching 11kΩ 47kΩ VCC 15 15 CUE/REV Mute LOGIC 16 NC Mute ON – Open Mute OFF – Low (less than 1.6V) VCC 17 LINE Mute Amp. OUT (Ch.2) DC 0V 47Ω Line amp. output 17 47Ω 21 LINE Mute Amp. OUT (Ch.1) 100Ω 47kΩ AC 1V –VCC 21 ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Pin Descriptions (Cont.) Pin No. Pin Name Typ. Waveform 18 LINE Mute Amp. IN (Ch.2) DC 0V Equivalent Circuit Description 18 20 Line amp. input 20 LINE Mute Amp. IN (Ch.1) 19 Supply Pin DC 6V 22 REC. Amp. Current Out (Ch.1) DC 0V 32 REC. Amp. Current Out (Ch.2) 23 REC. Amp. Voltage Out (Ch.1) AC 1V Main circuit + VCC Rec. amp. current output 200mV output at input 30mV, load 100kΩ 22 32 DC 0V 47Ω Rec. amp. voltage output 1.45V output at input 200mV 24 REC. Amp. NF OUT (Ch.1) 23 47Ω DC 0V 47Ω Rec. amp. feedback output 47Ω 30 REC. Amp. NF OUT (Ch.2) 25 REC. Amp. NF IN (Ch.1) 29 26 REC. Amp. IN (Ch.1) 30 25 Rec. amp. negative feedback input REC. Amp. IN (Ch.2) 100Ω 29 DC 0V 100Ω Rec. amp. input 28 47Ω 24 DC 0V REC. Amp. NF IN (Ch.2) 31 100Ω 31 REC. Amp. Voltage Out (Ch.2) 26 28 47Ω ICs for Cassette, Cassette Deck AN7351K, AN7351SC ■ Pin Descriptions (Cont.) Pin No. Pin Name Typ. Waveform Description Equivalent Circuit 27 VCC 47Ω 27 47Ω Rec. amp. mute switching Mute ON – Open Mute OFF – Low (less than 1.6V) REC. Mute LOGIC 47Ω VCC 20Ω 5kΩ 33 Speed H/L switching × 1– Open × 2 – Low (less than 1.2V ) SPEED H/L LOGIC 33 15kΩ 47kΩ 42 GND DC 0V Main Circuit GND