Audio ICs Low power consumption headphone driver for digital audio BA3576FS The BA3576FS is a headphone driver developed for use in 3.0V portable digital audio equipment. Applications Portable CD and MD players. Features 1) Low power consumption (when Po = 0.5mW per channel, the power supply current is 4.7mA, and the B current is 6.8mA (Typ.)). 2) High S / N ratio (96dB). Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 884 3) AVC circuit. 4) Beep output function 5) Mute circuit. Audio ICs BA3576FS Block diagram 885 Audio ICs BA3576FS Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 3.0V, B = 2.4V, f = 1kHz, RL = 16Ω, DIN AUDIO PWSTB = 3.0V, MUTE = 0V, ATT = OFF and AVC = OFF) 886 Audio ICs BA3576FS Measurement circuit 887 Audio ICs Measurement conditions 888 BA3576FS Audio ICs BA3576FS Application example 889 Audio ICs BA3576FS Operation notes (1) By operating the BA3576FS according to the timing chart shown in Fig.3, it is possible to suppress generation of “pop” noise in the headphone output. (2) The BA3576FS ripple filter pins (1 and 2) and the bias amp pins (3 and 4) cannot be used as external power supplies or reference voltages. (3) The BEEP signal is only output when PWSTB (pin 7) and MUTE (pin 9) are high level. Also, input a rectangular wave of between 500Hz and 5kHz and with an amplitude of VCC (with respect to ground) to BEEP IN (pin 11). Electrical characteristics curves 890 Audio ICs BA3576FS External dimensions (Units: mm) 891