The BA3578FS and BA3579FS are headphone drivers with internal an LPF and fixed bass boost circuit for multi-bit D / A converters.

FEATUREs
1) Suitable for use in digital audio equipment (line-out output noise voltage: 18µVrms, S / N = 95dB Typ.).
2) Internal LPF for multi-bit D / A converters (fc = 34kHz,
12dB / oct. Typ.).
3) Headphone mute function.
4) Internal BB (bass boost) circuit.
5) Internal supply current for line-mute transistor.
6) No need for output oscillation preventive measures.
7) Internal standby switch.

APPLICATIONs
    Portable CD players