4-channel digital audio system with FFX driver

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.

The STA321 input section consists of two multiplexed stereo analog inputs, a 16-bit ADC and two independent digital input interfaces. The serial audio data input interface accepts all possible formats, including the popular I2S format. There is also a digital output interface fed by the ADC or by the digitally processed signals.

Key Features

  • Embedded CMOS bridge: up to 0.5 W/channel
  • Output configurations:
  • Play and record simultaneous operation
  • pfStart™ for pop-free single-ended operations
  • Individual channel and master gain/attenuation
  • Pre and post mix stages
  • Soft volume update and muting
  • Digital gain/attenuation -105 dB to +36 dB in 0.5-dB steps
  • DC-blocking selectable high-pass filter
  • Up to 13 28-bit user programmable biquads (EQ) per channel
  • Selectable de-emphasis filter
  • Ternary, binary or phase shift modulation
  • Bass/treble tone control
  • Headphone output with jack detector
  • PWM output
  • I2 C control.
  • Four channels of 24-bit audio processing
  • 4-channel input sample rate converter (8 kHz to 192 kHz)
  • High efficiency FFX™ class-D modulator
  • Two stereo channels with I2S input/output data interface
  • 100-dB dynamic range
  • Analog and digital muxing/mixing capability
  • Flexible channel mapping and routing
  • 16-bit stereo ADC input with PGA and microphone biasing

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS6082 DS6082: 4-channel digital audio system with FFX™ driver 3.1 2 MB
Application Notes
Description Version Size
AN4118 AN4118: APWLink USB interface board for Sound Terminal® demonstration boards 2.0 1 MB
AN3340 AN3340: Loudspeaker characterization and compensation 1.3 3 MB
User Manuals
Description Version Size
UM1545 UM1545: Using the Audio Processor Workbench (APWorkbench) 1.0 3 MB

Publications and Collaterals

Description Version Size
ST’s solutions for mobile devices 3.2 3 MB
Support & Community

Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STA321TR TQFP 64 10x10x1.4 Tape And Reel - - Active 3.199 1000 NEC EAR99 MALAYSIA MORE INFO

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STA321TR ActiveTQFP 64 10x10x1.4IndustrialEcopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.