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MT9123AP
CMOS MT9123 Dual Voice Echo Canceller Data Sheet Features • • • • • • • • • • • • November 2005 Dual channel 64 ms or single channel 128 ms echo cancellation Conforms to ITU-T G.165 requirements Narrow-band signal detection Programmable double-talk detection threshold Non-linear processor 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 Ordering Information MT9123AP 28 Pin PLCC Tubes MT9123AE 28 Pin PDIP Tubes MT9123APR 28 Pin PLCC Tape & Reel MT9123AP1 28 Pin PLCC* Tubes MT9123APR1 28 Pin PLCC* Tape & Reel *Pb Free Matte Tin -40°C to +85°C Description The MT9123 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation conforming to ITU-T G.165 requirements. The MT9123 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 MT9123 operates in two major modes: Controller or Controllerless. Controller mode allows access to an array of features for customizing the MT9123 operation. Controllerless mode is for applications where default register settings are sufficient. Applications Wireless Telephony • Trunk echo cancellers Linear/ µ/A-Law Offset Null + Adaptive Filter Sin Programmable Bypass Linear/ µ/A-Law Sout Microprocessor Interface Double-Talk Detector Narrow-Band Detector Offset Null 12dB Attenuator Linear/ µ/A-Law Rout ENA2 ENB2 Non-Linear Processor Control • Linear/ µ/A-Law Rin ENA1 ENB1 CONFIG1 CONFIG2 S1/DATA1 S2/DATA2 S3/CS S4/SCLK Echo Canceller A NLP LAW FORMAT Echo Canceller B IC3 IC4 IC1 IC2 VDD VSS PWRDN F0od F0i BCLK/C4i 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. MCLK
MICRON
Micron Technology
U.S.A
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