OVERVIEW

The SM6452AM/BM are serial-control electronic variable volume ICs for audio applications. They provide electronic volume control for 6 channels, with independent channel gain, attenuation and muting. They feature enhanced digital zip noise suppression. The serial control options are 3-wire interface (SM6452AM) and I2C bus (SM6452BM). The SM6452AM/BM are available in 24-pin SSOP packages.

FEATURES

■ 6-channel input/output (positive-phase-sequence output)

■ Attenuation function

• 6-channel independent control

• +16 to 0 to −79dB variable range

• 1.0 dB/step adjustment

• Mute function

■ Microcontroller interface

• 3-wire serial data interface (SM6452AM)

• I2C bus format 2-wire control (SM6452BM)*1

• I2C address = 1000000

■ Low noise

• ≤ 0.002 THD + noise

• ≤ 10µVrms residual noise

■ 0.5AVDD analog reference voltage source built-in

■ Power supply

• 7 to 13V analog supply

• 2.7 to 5.5V digital supply

■ Molybdenum-gate CMOS process

■ 24-pin SSOP