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STA309B：Multi-channel digital audio processor with FFX

The STA309B 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 and PDM for MEMS microphone inputs. In the 5.1 application, the additional 2 channels can be used for audio line-out or headphone drive. In speaker mode, with 8 channel outputs in parallel, the STA309B can deliver 1 W (maximum).

Key Features

• 8 channels of 24-bit FFX®
• >100 dB SNR and dynamic range
• Selectable 32 kH-192 kHz input sampling rates
• 6 channels of DSD/SACD and PDM input
• 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
• I2 S 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

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