September 2007 Rev 1 1/67
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STA309A
Multi-channel digital audio processor with DDX®
Features
! 8 channels of 24-bit DDX
®
! >100 dB 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 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 invalid input detect mute
! Advanced PopFree operation
! Advanced AM interference frequency
switching and noise suppression modes
! I
2
S 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
®
o
utput 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
®
(direct digital amplification). In conjunction
with a DDX
®
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. In 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 STA309A can
deliver more than 1 W.
Table 1. Device summary
Order code Package
STA309A TQFP64
TQFP64
HKTS200SUB harman/kardon
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