STA308
MULTICHANNEL DIGITAL AUDIO PROCESSOR WITH DDX™
PRODUCT PREVIEW
■ 8 DDXTM Channels Capability (24 bit)
■ From 32kHz to 192kHz Input Sample Rates
Supported
■ Volume Control from 0 to -100dB (0.5 dB steps)
■ Variable Digital Gain from 0 to 24dB (0.5dB
TQFP64
steps) with Digital Limiter Functionality and
Variable Attack and Release Time
ORDERING NUMBER: STA308
■ I2S Inputs and Outputs
■ Individual Channel and Master Gain/
Attenuation
■ Individual Channel Mute and Zero Input Detect
DESCRIPTION
Auto-Mute
The STA308 is a single chip solution for digital audio
processing and control in multi-channel applications.
It provides output capabilities for DDXTM (Direct Digi-
tal Amplification). In conjunction with a DDXTM 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
channel and 192kHz, 24-bit DVD-Audio.
■ Selectable Serial Audio Data Interface
■ Bass/Treble Controls
■ Channel Mapping of any Input to any
Processing/DDXTM Channel
■ Active Crossover Capability
■ DC Blocking Selectable High-Pass Filter
■ Selectable Bass Management on Channel 6
■ Selectable Adjacent Channel Mixing Capability
The internal 24-bit DSP allows for high resolution
processing at all standard input sample frequencies.
Processing includes volume control, filtering, bass
management, gain compression/limiting and PCM
and DDXTM outputs. Filtering includes five user-pro-
grammable 28-bit biquads for EQ per channel, as
well as bass, treble and DC blocking. External clock-
ing can be provided at 4 different ratios of the input
sample frequency. All sample frequencies are up-
sampled for processing. Each internal processing
channel can receive any input channel, allowing flex-
ibility and the ability to perform active digital cross-
over for powered loudspeaker systems.
■ Selectable DDXTM Headphone Output on
Channels 7 & 8
■ Selectable Clock Input Ratio
■ Selectable De-emphasis
■ Selectable DDXTM Ternary, or Binary PWM
output
■ AM Interference Reduction Mode
■ I2C Control
The serial audio data interface accepts many differ-
ent formats, including the popular I2S format. Eight
channels of DDX processing are performed.
December 2002
1/33
This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.