STA309B Datasheet - STMicroelectronics

Multichannel digital audio processor with FFX®

Description
The STA309B is a single-chip solution for digital audio processing and control in multichannel
applications and providesoutput 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).

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
■ I2S 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