CS4922

DSP Optimized for Audio Decode, 24-bit
Fixed Point w/48-bit Accumulator
On-Chip Functional Blocks Include:
   - DSP with RAM and ROM Memories
   - CD Quality Stereo DAC with Output Filtering
   - Mono Output & Digital Volume Control
   - S/PDIF Transmitter, Bidirectional PCM Audio Port
   - Internal Phase Locked Loop for Clocking
   - Dedicated Compressed Serial Input Interface
MPEG-1 & MPEG-2 Layers 1 & 2 With All
Sample/Bit Rates and Ancillary Data Support.
MPEG-1 & MPEG-2 Packetized Audio
Stream and Elementary Stream Input
G.729A Audio Decode
PCM Synthesis for Auxiliary Audio
Pin Compatibility with CS4920A and Primary
Feature/Firmware Compatible
+5 Volt Only CMOS, 44 pin PLCC

The CS4922 is a complete audio decompression subsystem implemented in a single high integration mixed signal CMOS chip. The CS4922 has been widely used in direct broadcast system set-top boxes and proprietary embedded systems which pull compressed audio from local system memory.

The CS4922 is tailored to include the necessary hardware and firmware to ensure proper audio/video synchronization for MPEG-2 audio decompression. In addition to audio decoding this programmable DSP solution provides robust error concealment and feature implementations like ancillary data support and PCM synthesis.

The CS4922 can also support the decode of other compression standards such as G.729A with a separate
download image. The flexible architecture of the CS4922 provides the ability to mix compressed audio with data from the auxiliary PCM port.