OVERVIEW
The SM6453AB is a 3-wire serial data volume control for headphone amplifiers with built-in electronic volume control. Two switchable input systems are supported. It features bass boost function, auto gain control function (AGC), power-down function, and beep input, making it ideal for use in portable electronic products.

FEATURES
■ 2 stereo system inputs, 1 output system
■ 12mW + 12mW output (standard, 16Ω load, 2.0V supply voltage)
■ Attenuation function
    • 1.0dB step width
    • 80-step
    • + 12 to – 68dB variable range
■ Mute function
■ Low current consumption (2.3mA total, 2.4V supply voltage)
■ 12dB voltage gain
■ Bass boost function (2 boost characteristics controlled by external RC network)
■ Auto gain control function (AGC)
■ Beep sound input/output circuit
■ Power-down function
■ 1.9 to 3.6V operating supply voltage range
■ Silicon-gate CMOS process