General Description

The DS4420 is a fully differential, programmable-gain amplifier for audio applications. It features a -35dB to +25dB gain range controlled by an I2C interface and it is optimized to drive loads as low as 50Ω. The gain is adjustable in 3dB increments across the entire range. Three address inputs, used to select the I2C slave address, enable up to eight devices on a common bus.

The product operates from a single 5V supply over a -20°C to +70°C temperature range. It is offered in a 3mm x 3mm TDFN package.

Features

♦ Differential Inputs and Outputs

♦ -35dB to +25dB Adjustable Gain

♦ Low Output Noise

♦ Low-Distortion Driving into a 50Ω Load

♦ 3dB Gain Steps Programmed through I2C Interface

♦ 5V Single Supply

♦ 20kHz Bandwidth for All Gain Settings

♦ Small 3mm x 3mm x 0.8mm TDFN Package

♦ Up to Eight DS4420s can be Placed on the Same I2C Bus

Applications

  Telephone Headsets

  Audio Volume Control

  Microphone Gain Control