Overview
The STA321 is a single chip solution for digital audio processing applications of up to 4.0 channels.
The STA321 is part of the Sound Terminal™ family that together with the digital power stage provides full digital audio streaming to the speaker, offering cost effectiveness, low energy dissipation and sound enrichment.

Features
■ High efficiency FFX™ class-D modulator
■ 100-dB dynamic range
■ Two stereo channels with I2S input/output data interface
■ 16-bit stereo ADC input with PGA and microphone biasing
■ Analog and digital muxing/mixing capability
■ 4-channel input sample rate converter (8 kHz to 192 kHz)
■ Four channels of 24-bit audio processing
■ Flexible channel mapping and routing
■ Output configurations:
   – 2.0
   – 2.1
   – 4.0
   – Mono
■ Embedded CMOS bridge: up to 0.5 W/channel
■ pfStart™ for pop-free single-ended operations
■ Play and record simultaneous operation
■ Pre and post mix stages
■ Individual channel and master gain/attenuation
■ Digital gain/attenuation -105 dB to +36 dB in 0.5-dB steps
■ Soft volume update and muting
■ DC-blocking selectable high-pass filter
■ Selectable de-emphasis filter
■ Up to 13 28-bit user programmable biquads (EQ) per channel
■ Bass/treble tone control
■ Ternary, binary or phase shift modulation
■ PWM output
■ Headphone output with jack detector
■ I2C control.