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| ICs for Audio Common Use AN7118S Low Voltage Dual 35mW Audio Power Amplifier Circuits (BTL 300mW) s Overview The AN7118S is the ICs designed for power amplifier of low voltage operated compact radio and stereo tape recorder. Stereo operation is enabled due to incorporating two amplifiers on one chip. Miniaturization of cassette and high integration is realized due to SOP package. 1.3 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 Unit : mm 0.40.25 0.10.1 s Features * Low voltage operation : VCC = 1.8V to 4.5V * Reduced voltage operation is available. * Low pop noise when supply voltage is switched 0.3 5.40.3 7.70.3 18-Lead SOP Package (SOP018-P-0300) s Block Diagram VCC 18 N.C 3 Input Amp. Input (1) Input (2) 11 N.C 16 Input Amp. Driver Driver SEPP Output Amp. Output (1) Output (2) SEPP Output Amp. 17 2 7 6 5 4 9 8 10 12 13 14 15 1 GND (Output) GND (Input) 0.15 0.65 ON and OFF * Stereo drive of 4 (speaker) to 32 (headphone) load is possible. 1.27 1.50.2 12.60.3 AN7118S s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 Pin Name GND (Output) Output Ch.1 NC Bootstrap Phase Compensation Phase Compensation N.F.B Input Ch.1 VCC Pin No. 10 11 12 13 14 15 16 17 18 Pin Name GND (Input) Input Ch.2 N.F.B Phase Compensation Phase Compensation Bootstrap NC Output Ch.2 Ripple Filter ICs for Audio Common Use s Absolute Maximum Ratings (Ta= 25C) Parameter Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC ICC PD Topr Tstg Rating 4.5 1 400 - 20 ~ + 75 - 50 ~ + 125 Unit V A mW C C s Electrical Characteristics (VCC = 3V, Ta = 25C) Parameter Quiescent Circuit Current Symbol ICQ GV PO THD Vno Ri RR VCC= 3V 200mV, f= 100Hz Vi= 0mV Vi= 1.5mV, RL= 32 THD = 10%, RL= 32 x 2ch. Vi= 1.5mV, RL= 32 x 2ch. Rg= 10k, DIN Audio Filter 45 Condition min. typ. 13 47 33 0.3 0.5 20 35 1 1 max. 18 49 Unit mA dB mW % mW k dB Voltage Gain Maximum Output Total Harmonic Distortion Output Noise Voltage Input Resistance Ripple Rejection Ratio ICs for Audio Common Use s Application Circuit AN7118S Dual Circuit VCC AN7118S - N.C + Ch.1 Input 3 8 10 7 22F 68pF 5 9 4 47F - + 220F + 6 - 470F 2 + 4.7 - SP 0.01F Ch.2 Input 11 16 12 13 14 18 15 AN7118S 1 470F 17 0.01F + 4.7 - SP N.C + + 22F 68pF + 220F - 47F - - s Characteristics Curve PD - Ta 1200 1000 Input Power Dissipation PD (mV) 800 600 400 200 0 0 20 40 60 80 Ambient Temperature Ta (C) s Supplementary Explanation of IC Characteristics * Not necessary for input coupling capacitor. Input electric potential is about 0 bias, using PNP Tr for input stage. * One chip dual amp. (Stereo operation) * Battery operation is possible at 1.8V to 4.5V * Decreased voltage operation is available, and suitable for a long battery operation. * Load impedance can be driven from 4, which makes it possible to use for both speaker and headphone. * Small shock noise at power ON and OFF. |
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