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