Multi-channel digital audio processor with DDX®

The STA309A is a single chip solution for digital audio processing and control in multi-channel applications. It provides output capabilities for DDX®. In conjunction with a DDX® power device, the STA309A provides high-quality, high-efficiency, all digital amplification. The device is extremely versatile, allowing inputs of most digital formats including 6.1/7.1-channel and 192 kHz, 24-bit DVD-audio, DSD/SACD. In 5.1 applications the additional 2 channels can be used for audio line-out or headphone drive. In speaker mode, with 8 channel outputs in parallel, the STA309A can deliver more than 1 W.

Key Features

  • Pre and post EQ full 8-channel input mix on all 8 channels
  • Bass/treble tone control
  • Dynamic range compression
  • Dual independent limiters/compressors
  • Individual channel and master soft/hard mute
  • Automode™:5-band graphic EQ32 preset EQ curves (rock, jazz, pop, etc.)Automatic volume controlled loudness5.1 to 2-channel downmixSimultaneous 5.1- and 2-channel downmix outputs3 preset volume curves2 preset anti-clipping modesPreset movie nighttime listening modePreset TV channel/commercial AGC mode5.1, 2.1 bass management configurations8 preset crossover filters
  • Automatic invalid input detect mute
  • Automatic zero-detect and invalid input mute
  • Advanced PopFree operation
  • I2 S output channel mapping function
  • Advanced AM interference frequency switching and noise suppression modes
  • Channel mapping of any input to any processing/DDX® channel
  • Independent channel volume and DSP bypass
  • Selectable per-channel DDX® damped ternary or binary PWM output
  • DC blocking selectable high-pass filter
  • Variable per channel DDX® output delay control
  • Max power correction for lower full-power THD
  • 192 kHz internal processing sample rate, 24-bit to 36-bit precision
  • Individual channel and master gain/attenuation plus channel trim (-10 dB to +10 dB)
  • Soft volume update
  • 8 channels of 24-bit DDX® (direct digital amplification)
  • Selectable 32 kHz - 192 kHz input sample rates
  • >100 dB of SNR and dynamic range
  • Digital gain/attenuation +58 dB to -100 dB in 0.5-dB steps
  • Up to 10 independent 32-bit user programmable biquads (EQ) per channel
  • 6 channels of DSD/SACD input

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS5443 DS5443: Multi-channel digital audio processor with DDX® 4.1 592 KB
Application Notes
Description Version Size
AN4118 AN4118: APWLink USB interface board for Sound Terminal® demonstration boards 2.0 1 MB
AN2874 AN2874: BQD filter design equations 1.1 65 KB
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
STA309A13TR LQFP 64 10x10x1.4 Tape And Reel - - Active 3 1000 NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) 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**
STA309A13TR ActiveLQFP 64 10x10x1.4IndustrialEcopack1 0 0

(**) 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.