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Multi-channel digital audio processor with DDX®

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Product overview


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.

  • All 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
    • I2S 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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - STA309A

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LQFP 64 10x10x1.4 mm Industrial Ecopack2



LQFP 64 10x10x1.4 mm

Material Declaration**:


Marketing Status



LQFP 64 10x10x1.4 mm



RoHS Compliance Grade


(**) 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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