SigmaDSP Low-noise Stereo Audio Codec for Portable Applications

The ADAU1781 is a low power, 24-bit stereo audio codec. The low noise DAC and ADC support sample rates from 8 kHz to 96 kHz. Low current draw and power saving modes make the ADAU1781 ideal for battery-powered audio applications.

A programmable SigmaDSP® core provides enhanced record and playback processing to improve overall audio quality.

The record path includes two digital stereo microphone inputs and an analog stereo input path. The analog inputs can be configured for either a pseudo differential or a single-ended stereo source. A dedicated analog beep input signal can be mixed into any output path. The ADAU1781 includes a stereo line output and speaker driver, which makes the device capable of supporting dynamic speakers.

The serial control bus supports the I2C® or SPI protocols, and the serial audio bus is programmable for I2S, left-justified, right-justified, or TDM mode. A programmable PLL supports flexible clock generation for all standard rates and available master clocks from 11 MHz to 20 MHz.

Applications

* Digital still cameras

* Digital video cameras

* Programmable SigmaDSP core for audio processing

* 24-bit stereo audio ADC and DAC

* 400 mW speaker amplifier (into 8 Ω load)

* Optional stereo digital microphone input pulse-density modulation (PDM)

* PLL supporting a range of input clock rates