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MT9126
Quad ADPCM (G.726) Transcoder
Product Status - Production
The Quad ADPCM Transcoder is a low power, CMOS device capable of four encode and four decode
functions per frame. Four 64 kbit/s PCM octets are compressed into four 32, 24 or 16 kbit/s ADPCM
words, and four 32, 24 or 16 kbit/s ADPCM words are expanded into four 64 kbit/s PCM octets. The
32, 24 and 16 kbit/s ADPCM transcoding algorithms utilized conform to ITU-T Recommendation G.726
(excluding 40 kbit/s), and ANSI T1.303 - 1989. Switching, on-the-fly, between 32 kbit/s and 24 kbit/s
ADPCM, is possible by controlling the appropriate mode select (MS1 - MS6) control pins. All optional
functions of the device are pin selectable allowing a simple interface to industry standard codecs,
digital phone devices and Layer 1 transceivers. Linear coded PCM is provided to facilitate external
DSP functions.
Related Resources
User Functions
Features
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Full duplex transcoder with four encode channels and four decode channels
32 kb/s, 24 kb/s and 16 kb/s ADPCM coding complying with ITU-T (previously CCITT) G.726
(without 40 kb/s), and ANSI T1.303-1989
Low power operation, 25 mW typical
Asynchronous 4.096 MHz master clock operation
SSI and ST-BUS interface options
Transparent PCM bypass
Transparent ADPCM bypass
Linear PCM code
No microprocessor control required
Simple interface to Codec devices
Pin selectable uLaw or A-Law operation
Pin selectable ITU-T or signed magnitude PCM coding
Single 5 volt power supply
Typical Applications
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Pair gain
Voice mail systems
Wireless telephony systems
Product Information
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Data sheet
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10-APR-02
01-JAN-01
PDF - 240.3K
JPEG - 45.5K
http://download.siliconexpert.com/pdfs/adpcm_voice_compression/zar/mt9126asr.html (1 of 2)6/27/2005 7:02:30 PM
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