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| ICs for Cassette, Cassette Deck AN7352S Playback Pre-amplifier for Stereo Cassette Deck s Overview 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. 0.40.25 0.45 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 Unit : mm 0.10.1 s Features * Variable volume 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 7.20.3 9.40.3 28-Lead SOP Package (SOP028-P-0375A) s Pin Name Pin No. 1 2 3 4 5 6 7 8 9 10 -VCC PB T1 Input (R Ch.) PB T2 Input (R Ch.) PB NF Input (R Ch.) 120/ 70 ( x 2) NF SW 120/ 70 ( x 1) NF SW PB Monitor Output T1/ T2 LOGIC 120/ 70 LOGIC PB Output (R Ch.) Pin Name Pin No. 11 12 13 14 15 16 17 18 19 20 MS Input +VCC MS NF Input MS Output MS De-coupling MS GND Volume Control (L Ch.) PB Output (L Ch.) x 1/ x 2 LOGIC Pin Name Volume Control (R Ch.) Pin No. 21 22 23 24 25 26 27 28 Pin Name P/R LOGIC PB Monitor Output 120/ 70 ( x 2) NF SW 120/ 70 ( x 1) NF SW PB NF Input (L Ch.) PB T2 Input (L Ch.) PB T1 Input (L Ch.) GND s Block Diagram GND 28 27 26 25 24 23 22 21 20 19 18 17 16 15 P/ R x 1/ x2 CTL 22k - + 1k + - 82k +- CTL 47pF T1/ T2 120/ 70 1 -VCC 2 3 4 5 6 7 8 9 10 11 12 13 +VCC 0.925 47k 14 0.15 2.00.2 17.810.3 1.27 AN7352S s Absolute Maximum Ratings (Ta=25C) Parameter Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC ICC (+) ICC (-) PD Topr Tstg ICs for Cassette, Cassette Deck Rating 6.7 22 20 702 -25 ~ + 75 -55 ~ + 150 Unit V mA mA mW C C s Recommended Operating Range (Ta= 25C) Parameter Operating Supply Voltage Range Symbol VCC Range 4.5V ~ 6.5V s Electrical Characteristics (VCC= 6V, Ta=25C) Parameter Consumption Current Reference Output Level (0dB) Reference Output Level (+ 6dB) Reference Output Level (- 6dB) Level Difference Between Channels Level Difference Between Tapes Total Harmonics Distortion (0dB) Output Noise Voltage Maximum Output Level (0dB) Crosstalk Between Channels Output Offset Voltage (0dB) Muting Attenuation Muting Attenuation (T1) Muting Attenuation (T2) MS Amp. Section 4kHz Gain (Input Voltage) High-Frequency Band Gain (Input Voltage) Logic - L Time Constant Switching Pin Voltage Tape Switching Pin Voltage Speed Switching Pin Voltage R - P Switching Pin Voltage Logic - H Time Constant Switching Pin Voltage Tape Switching Pin Voltage Speed Switching Pin Voltage R - P Switching Pin Voltage Mute Mute ON Voltage Mute OFF Voltage Vmute1 Vmute2 V9H V8H V20H V21H V9L V8L V20L V21L GMS1 GMS2 Symbol Itot V1 GH GL DGLR DGT12 THD11 Vno VOMX CT VOFF GM0 GM1 GM2 Condition VCC = 6V, At no signals Vin = -50dBv, f = 1kHz 30kHz LPF ON, VCNT = 2.5V VCNT = 5V, GH = DATA (2)- DATA (1) VCNT = 1.25V, GL = DATA (3) - DATA (1) VCNT = 2.5V, DGLR = V1L- V1R VCNT = 2.5V, DGT1T2 = V1T1 -V1T2 VCNT = 2.5V, V9/V20 = 0V, V8/V21= 5V VCNT = 2.5V, DIN AUDIO, Rg = 2.2k VCNT = 2.5V, THD = 3% VCNT = 2.5V, Rg = 220 VCNT = 2.5V, Rg = 220 VCNT = 0V VCNT = 2.5V VCNT = 2.5V VCC = 6V, V15 = 0.3V f = 4kHz f = 50kHz VCC = 4.5V 120s mode T2 mode Double speed ( x 2) mode R mode VCC = 6.5V 70s mode T1 mode Double speed ( x 1) mode P mode VCC = 6V 0 1.25 0.7 5 V V 2.6 3.1 3.1 2.6 5 5 5 5 V V V V 0 0 0 0 1.5 1.2 1.2 1.5 V V V V -51 -44 dBv dBv 2 60 -230 60 60 60 min. 9 45.4 +5 -7 typ. 11 47.4 +6 -6 0 0 0.1 -69 3.6 +130 max. 22 49.4 +7 -5 1 1 0.3 -62 Unit mA dB dB dB dB dB % dBv dBv dB mV dB dB dB ICs for Cassette, Cassette Deck s Application Circuit 82 AN7352S 100k 100k 100F + 0.0056F 10k 27k 22k 680pF 680pF 47k MS GND PB OUT 20 x 1/ x2 19 18 CTL 22k 17 + 5V 10k 15 47k 1k 82k 14 100 + 28 GND 27 26 560k 25 24 23 22 21 P/ R 16 - + + - 1F T1/ T2 -VCC 1 2 680pF 120/ 70 9 10 PB OUT +- CTL 11 12 2.2k 13 3 680pF 4 27k 10k 22k 47k 5 560k 6 7 8 100k 100k 100F + 0.0056F 82 10F 47pF |
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