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MT9122

MITEL

Dual Voice Echo Canceller

MT9122 Dual Voice Echo Canceller with Tone Detection Data Sheet Features • Dual channel 64 ms or single channel 128 ms ...


MT9122

MITEL


Octopart Stock #: O-1496769

Findchips Stock #: 1496769-F

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Description
MT9122 Dual Voice Echo Canceller with Tone Detection Data Sheet Features • Dual channel 64 ms or single channel 128 ms echo cancellation • Conforms to ITU-T G.165 requirements • ITU-T G.165/G.164 disable tone detection supported on all audio paths • Narrow-band signal detection • Programmable double-talk detection threshold • Non-linear processor
More View with adaptive suppression threshold and comfort noise insertion • Offset nulling of all PCM channels • Controllerless mode or Controller mode with serial interface • ST-BUS or variable-rate SSI PCM interfaces • Selectable µ/A-Law ITU-T G.711; µ/A-Law Sign Mag; linear 2’s complement • Per channel selectable 12 dB attenuator • Transparent data transfer and mute option • 19.2 MHz master clock operation September 2005 Ordering Information MT9122AE MT9122AP MT9122APR MT9122AP1 MT9122APR1 28 Pin PDIP 28 Pin PLCC 28 Pin PLCC 28 Pin PLCC* 28 Pin PLCC* Tubes Tubes Tape & Reel Tubes Tape & Reel *Pb Free Matte Tin -40°C to +85°C Applications • Wireless Telephony • Trunk echo cancellers Description The MT9122 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation conforming to ITU-T G.165 requirements. The MT9122 architecture contains two echo cancellers which can be configured to provide dual channel 64 millisecond echo cancellation or single channel 128 millisecond echo cancellation. The MT9122 supports ITU-T G.165 or G.164 tone disable requirements. Sin Rout ENA2 ENB2 NLP REV LAW FORMAT TD1 TD2 Linear/ µ/A-Law Offset Null + - Non-Linear Processor Linear/ µ/A-Law Disable Tone Detector Programmable Bypass Adaptive Filter Control Microprocessor Interface Double-Talk Detector Narrow-Band Detector Disable Tone Detector Linear/ µ/A-Law 12dB Attenuator Offset Null Linear/ µ/A-Law Echo Canceller A Echo Canceller B VDD VSS PWRDN IC F0od F0i BCLK/C4i MCLK Figure 1 - Functional Block Diagram 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 1996-2005, Zarlink Semiconductor Inc. All Rights Reserved. Sout Rin ENA1 ENB1 CONFIG1 CONFIG2 S1/DATA1 S2/DATA2 S3/CS S4/SCLK MT9122 Data Sheet The MT9122 operates in two major modes: Controller or Controllerless. Controller mode allows access to an array of features for customizing the MT9122 operation. Controllerless mode is for applications where default register settings are sufficient. 4 ENB2 3 ENA2 2 ENB1 1 ENA1 28 CONFIG2 27 CONFIG1 26 BCLK/C4i ENA1 1 28 ENB1 2 27 ENA2 3 26 ENB2 Rin Sin 4 25 5 24 6 PDIP 23 VSS 7 22 MCLK 8 21 IC 9 20 NLP 10 19 REV 11 18 LAW 12 17 FORMAT 13 16 PWRDN 14 15 CONFIG2 CONFIG1 BCLK/C4i F0i Rout Sout VDD F0od S1/DATA1 S2/DATA2 S3/CS S4/SCLK TD1 TD2 Rin 5 Sin 6 VSS 7 MCLK 8 IC 9 NLP 10 REV 11 • PLCC 25 F0i 24 Rou






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