ICs for Audio Common Use AN7118S Low Voltage Dual 35mW Audio Power Amplifier Circuits (BTL 300mW) ■ Overview Unit : mm 0.4±0.25 1.27 ■ 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 5.4±0.3 7.7±0.3 0.15 0.65 1.5±0.2 0.1±0.1 ON and OFF • Stereo drive of 4Ω (speaker) to 32Ω (headphone) load is possible. 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 12.6±0.3 1.3 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. 18-Lead SOP Package (SOP018-P-0300) ■ Block Diagram VCC 18 N.C 7 6 5 4 9 3 Input Amp. 8 SEPP Output Amp. Driver 2 Input (1) Output (1) Input (2) Output (2) 11 Input Amp. SEPP Output Amp. Driver 17 N.C 16 10 12 GND (Input) 13 14 15 1 GND (Output) ICs for Audio Common Use AN7118S ■ Pin Descriptions Pin No. Pin Name Pin No. Pin Name 1 GND (Output) 10 GND (Input) 2 Output Ch.1 11 Input Ch.2 3 NC 12 N.F.B 4 Bootstrap 13 Phase Compensation 5 Phase Compensation 14 Phase Compensation 6 Phase Compensation 15 Bootstrap 7 N.F.B 16 NC 8 Input Ch.1 17 Output Ch.2 9 VCC 18 Ripple Filter ■ Absolute Maximum Ratings (Ta= 25˚C) Symbol Rating Supply Voltage Parameter VCC 4.5 Supply Current ICC 1 Power Dissipation PD 400 Operating Ambient Temperature Topr – 20 ~ + 75 ˚C Tstg – 50 ~ + 125 ˚C Storage Temperature Unit V A mW ■ Electrical Characteristics (VCC = 3V, Ta = 25˚C) Parameter Quiescent Circuit Current Symbol ICQ Condition min. Vi= 0mV typ. max. 13 18 47 49 Unit mA <DUAL (f=1kHz)> 45 Voltage Gain GV Vi= 1.5mV, RL= 32Ω Maximum Output PO THD = 10%, RL= 32Ω × 2ch. 33 dB mW THD Vi= 1.5mV, RL= 32Ω × 2ch. 0.3 1 % Output Noise Voltage Vno Rg= 10kΩ, DIN Audio Filter 0.5 1 mW Input Resistance Ri Ripple Rejection Ratio RR Total Harmonic Distortion VCC= 3V± 200mV, f= 100Hz 20 kΩ 35 dB ICs for Audio Common Use AN7118S ■ Application Circuit AN7118S Dual Circuit VCC 22µF – 47µF 68pF Ch.1 Input + 7 6 220µF + N.C + 3 – 5 9 – 4 470µF 2 8 + – 0.01µF AN7118S 10 Ch.2 Input 1 SP 4.7Ω 470µF 11 16 12 13 14 N.C + – 18 15 + – 22µF 68pF + 220µF – 0.01µF 17 + 4.7Ω – SP 47µF ■ Characteristics Curve PD – Ta 1200 Input Power Dissipation PD (mV) 1000 800 600 400 200 0 0 20 40 60 80 Ambient Temperature Ta (˚C) ■ 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 4Ω, which makes it possible to use for both speaker and headphone. • Small shock noise at power ON and OFF.