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4-channel digital audio system with FFX driver
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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.

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Errata Sheet
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Key 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:
  • 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.

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6082: 4-channel digital audio system with FFX™ driver
3.1 2,127 KB

Application Notes

Description Version Size
AN3340: Loudspeaker characterization and compensation
1.3 3,944 KB
AN4118: APWLink USB interface board for Sound Terminal® demonstration boards
2.0 1,029 KB

User Manual

Description Version Size
UM1545: Using the Audio Processor Workbench (APWorkbench)
1.0 3,221 KB

Presentations & Training Material

Training Material

Description Version Size
Learn the basics about STSpeakerSafe technology
1.0 181 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STA321NRNDTQFP 64 10x10x1.4Tray_-3.199Distributor reported inventory date: 2015-11-25
Distributor NameRegionStockMin. order
STA321TRActiveTQFP 64 10x10x1.4Tape And Reel_-3.199No availability reported, please contact our Sales officeEcopack2-

(*) 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
(**) The Material Declaration forms available on 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.
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