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| Audio ICs Headphone driver for digital audio BA3578FS / BA3579FS The BA3578FS and BA3579FS are headphone drivers with internal an LPF and fixed bass boost circuit for multi-bit D / A converters. FApplications Portable CD players FFeatures 1) Suitable for use in digital audio equipment (line-out output noise voltage: 18Vrms, S / N = 95dB Typ.). 2) Internal LPF for multi-bit D / A converters (fc = 34kHz, *12dB / oct. Typ.). 3) Headphone mute function. 4) 5) 6) 7) Internal BB (bass boost) circuit. Internal supply current for line-mute transistor. No need for output oscillation preventive measures. Internal standby switch. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions FRecommended operating range 450 Audio ICs FBlock diagram BA3578FS / BA3579FS 451 Audio ICs BA3578FS / BA3579FS 452 Audio ICs BA3578FS / BA3579FS FElectrical characteristics (Unless otherwise noted, Ta = 25_C, PVCC = AVDD = 3.6V, f = 1kHz, PwSw = ON, MUTE = OFF, BB = OFF, Line RL1 = 47k, headphone RL2 = 32, filter = DIN AUDIO, line-out measurements are with VIN3 and 4 = 0V) 453 Audio ICs FMeasurement circuits BA3578FS / BA3579FS 454 Audio ICs BA3578FS / BA3579FS 455 Audio ICs Measurement conditions BA3578FS / BA3579FS 456 Audio ICs FApplication examples BA3578FS / BA3579FS 457 Audio ICs BA3578FS / BA3579FS 458 Audio ICs BA3578FS / BA3579FS FCircuit operation (1) By operating the BA3578FS and BA3579FS according to the timing chart shown in Fig. 5, it is possible to suppress generation of "pop" noise in the headphone output. (2) The voltage of the BIAS pin (pin 11) for the BA3578FS and BA3579FS is the voltage divided from the AVDD pin (pin 1). There is no current carrying capacity, so do not use it as an operating point for external circuits. 459 Audio ICs FElectrical characteristic curves BA3578FS / BA3579FS FExternal dimensions (Unit: mm) 460 |
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