mt9122-datasheet - Zarlink Semiconductor - #1

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ZARLINK S EM ICON DUCTO R MT9122 Dual Voice Echo Canceller with Tone Détection 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 détection supported on ail audio paths Narrow-band signal détection Programmable double-talk détection threshold Non-linear processor with adaptive suppression threshold and comfort noise insertion Offset nulling of ail PCM channels Controllerless mode or Controller mode with sériai interface ST-BUS or variable-rate SSI PCM interfaces Selectable |i/A-Law ITU-T Q711 ; (i/A-Law Sign Mag; linear 2's complément Per channel selectable 12 dB attenuator Transparent data transfer and mute option 19.2 MHz master clock opération Scptcmbrr Ordering Information MT9122AE 28 Pin PDIP Tubes MT9122AP 28 Pin PLCC Tubes MT9122APR 28 Pin PLCC Tape & Réel MT9122AP1 28 Pin PLCC" Tubes MT9122APR1 28 Pin PLCC" Tape & Réel 'Pb Free Matte Tin -40 Cto +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. 5'n li if llj JOffsell iiM-lawrj*| Nul! [ Non-Lincar Proce | ^| ^l'ALawP"^ Sout Jisable lone Detectof Micropf«essor Interface Double laik Dctodor Narrow-Band Détecter Disable Tone Dotoctor Roui < ena? - ENB2- NLP — REV — LAW-FORMAT — TD1 < 102 < u/A-l_aw 12dB ri Allenuator Rin ENA1 ENB1 CONFIG1 CONFIG2 SI/DATAI s? data: es S4/SCLK Echo Canceller A Echo Canceller B îTr BCLK'C4i MCLK vss P'A'RDN FÛOd -0i vn:: Figure 1 - Functional Block Diagram Zariink Semtconductof Inc Zariink. ZL and the Zariink Semtconductoi logo are trademarks of Zariink Semiconduclor Inc Copynghl 1996?«to, /atlit* Semicondiiclot Inc AIRtghts Reservod