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MT9126AS Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT9126AS Datasheet(HTML) 1 Page - Mitel Networks Corporation |
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1 / 22 page  8-33 ® Features • 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 µ−Law or A-Law operation • Pin selectable ITU-T or signed magnitude PCM coding • Single 5 volt power supply Applications • Pair gain • Voice mail systems • Wireless telephony systems Description 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 . Ordering Information MT9126AE 28 Pin Plastic DIP MT9126AS 28 Pin SOIC -40 °C to +85 °C ISSUE 2 May 1995 ADPCM I/O PCM I/O Control Decode VDD VSS PWRDN IC MS1 MS2 A/ µ FORMAT MS5 MS4 MS3 MS6 LINEAR SEL Timing ADPCMi ADPCMo ENB1 ENB2/F0od BCLK F0i MCLK C2o EN1 EN2 PCMo1 PCMi1 PCMo2 PCMi2 Full Duplex Quad Transcoder Figure 1 - Functional Block Diagram MT9126 Quad ADPCM Transcoder Preliminary Information CMOS |
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Similar Description - MT9126AS |
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