OVERVIEW

The SM6453AB is a stereo headphone amplifier IC with built-in electronic volume controlled by 3-wire serial data. Two switchable input systems are supported. It features bass boost function, automatic gain control (AGC) function, power-down function, and beep sound input/output function, making it ideal for use in portable electronic products.

FEATURES

■ 2 stereo system inputs, selectable 1 output system

■ Headphone amplifier function

• +12dB to -68dB output voltage gain range (GCNT)

• +12dB headphone amplifier gain (GHPA)

■ Attenuation function

• 1.0dB step width, 81 steps, 0 to –80dB range (GEVR)

■ Mute function

■ Bass boost function (2 boost characteristics controlled by external RC network)

■ Auto gain control function (AGC)

■ Beep sound input/output circuit

■ 26mW+26mW maximum output power (1kHz, THD + N = 10, 16Ω load, 2.0V supply voltage)

■ Power-down function

■ 1.8 to 3.6V operating supply voltage range

■ Low current consumption (2.3mA total, 2.4V supply voltage)

■ Silicon-gate CMOS process

■ 32-pin QFN package