Description
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.

Features
■ 8 channels of 24-bit DDX® (direct digital amplification)
■ >100 dB of SNR and dynamic range
■ Selectable 32 kHz - 192 kHz input sample rates
■ 6 channels of DSD/SACD input
■ Digital gain/attenuation +58 dB to -100 dB in 0.5-dB steps
■ 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
■ Automode™:
   – 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
   – 8 preset crossover filters
■ Individual channel and master soft/hard mute
■ Automatic zero-detect and invalid input mute
■ Automatic invalid input detect mute
■ Advanced PopFree operation
■ 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/DDX® channel
■ DC blocking selectable high-pass filter
■ Selectable per-channel DDX® damped ternary or binary PWM output
■ Max power correction for lower full-power THD
■ Variable per channel DDX® output delay control
■ 192 kHz internal processing sample rate, 24-bit to 36-bit precision