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

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.