This document describes the features and characteristics of the STA309A multi-channel digital audio processor, including 8 channels of 24-bit DDX (direct digital amplification), >100 dB of SNR and dynamic range, selectable 32 kHz - 192 kHz input sample rates, etc.
The STMicroelectronics STA309A is a multi-channel digital audio processor designed for applications requiring direct digital amplification (DDx). It integrates eight channels of 24-bit processing, supporting input sample rates from 32 kHz to 192 kHz and accepting DSD/SACD inputs. The device works in conjunction with external DDX power devices to provide high-quality, all-digital audio output.
The device provides a selectable digital gain and attenuation range from +58 dB to -100 dB in 0.5-dB steps.
In speaker mode with 8 channel outputs in parallel, the device can deliver more than 1 W.