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| Audio ICs Low power consumption headphone driver for digital audio BA3577FS The BA3577FS is a headphone driver developed for portable digital audio equipment that supports a voltage of 1.5V. FApplications Portable MD players and others FFeatures 1) 1.5V supported. 2) Low current consumption (At PO = 0.5mW / ch, VCC inflow current = 3.3mA, and )B inflow current = 6.8mA (Typ.)). 3) Output coupling capacitor of 100F produces fC = 45Hz (RL = 16). 4) Internal muting switch. 5) Internal ripple filter. 6) Internal BEEP circuit. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 818 Audio ICs FBlock diagram BA3577FS 819 Audio ICs FPin descriptions BA3577FS 820 Audio ICs BA3577FS 821 Audio ICs BA3577FS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 2.8V, )B = 1.2V, PWSTB = 2.8V, MUTE = 0V, RL = 16, f = 1kHz, DIN AUDIO) 822 Audio ICs FMeasurement circuit BA3577FS 823 Audio ICs Measurement conditions BA3577FS 824 Audio ICs BA3577FS FCircuit operation (1) The BA3577FS operates at the timing chart shown below, which prevents popping noises in the headphone output. (2) The ripple filters (pins 1 and 2) and bias amplifiers (pins 3 and 4) of the BA3577FS cannot be used as external power supplies or reference voltages. (3) The BA3577FS outputs a BEEP signal only when the PWSTB pin (pin 7) and the MUTE pin (pin 9) are HIGH. Also, input a rectangular waveform of 500Hz to 5kHz with an amplitude from the GND to VCC to the BEEP IN pin (pin 11). 825 Audio ICs FApplication example BA3577FS FElectrical characteristic curves 826 Audio ICs FExternal dimensions (Units: mm) BA3577FS 827 |
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