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Multichannel digital audio processor with FFX
  • active Active

The STA311B is a single-chip solution for digital audio processing and control in multichannel applications and provides output capabilities for FFX™ (full flexible amplification). In conjunction with an FFX™ power device, it provides high-quality, high-efficiency, all digital amplification. The device is extremely versatile, allowing for input of most digital formats including 6.1/7.1-channel and 192 kHz, 24-bit DVD-audio, DSD/SACD. In the 5.1 application the additional 2 channels can be used for audio line-out or headphone drive.

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Key Features

  • 8 channels of 24-bit FFX
  • >100 dB SNR and dynamic range
  • Selectable 32 kHz-192 kHz input sampling rates
  • 6 channels of DSD/SACD
  • Digital gain/attenuation +58 dB to -100 dB in 0.5 dB steps
  • Advanced “pop-free” operation
  • Digital “pop-free” operation for single-ended mode
  • Soft volume update
  • Individual channel and master gain/attenuation plus channel trim (-10 dB to +10 dB)
  • Up to 10 independent 32-bit user-programmable biquads (EQ) per channel
  • Bass/treble tone control
  • Pre- and post-EQ full 8-channel input mix on all 8 channels
  • Dual independent limiters/compressors
  • Dynamic range compression or anti-clipping modes
  • AutoModes
  • 5-band graphic EQ
  • 32 preset EQ curves (rock, jazz, pop, etc.)
  • Automatic volume-controlled loudness
  • 5.1 to 2-channel downmix
  • Simultaneous 5.1- and 2-channel downmix outputs
  • 3 preset volume curves
  • 2 preset anti-clipping modes
  • Preset movie nighttime listening mode
  • Preset TV channel/commercial AGC mode
  • 5.1, 2.1 bass management configurations
  • AM frequency automatic output PWM frequency shifting
  • 8 preset crossover filters
  • Individual channel and master soft/hard mute
  • Automatic zero-detect and invalid input mute
  • Automatic amplifier power-down on clock loss
  • Advanced AM interference frequency switching and noise suppression modes
  • I²S output channel mapping function
  • Independent channel volume and DSP bypass
  • Channel mapping of any input to any processing/FFX channel
  • Selectable per-channel FFX damped ternary or binary PWM output
  • Max power correction for lower full-power THD
  • Variable per-channel FFX output delay control
  • 192 kHz internal processing sampling rate, 24-bit to 36-bit precision

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS9521: Multichannel digital audio processor with FFX™
1.0 1,251 KB

Application Notes

Description Version Size
AN3340: Loudspeaker characterization and compensation
1.3 3,944 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**
STA311BActiveVFQFPN 59 8x8x0.9Tray-4090_-3No availability reported, please contact our Sales officeEcopack2PDF
STA311BTRActiveVFQFPN 59 8x8x0.9Tape And Reel-4090_Free Samples3Distributor reported inventory date: 2015-11-30
Distributor NameRegionStockMin. order

(*) 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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