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ZL38001 Datasheet(PDF) 1 Page - Zarlink Semiconductor Inc |
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ZL38001 Datasheet(HTML) 1 Page - Zarlink Semiconductor Inc |
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1 / 47 page  1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2004, Zarlink Semiconductor Inc. All Rights Reserved. Features • Contains two echo cancellers: 112 ms acoustic echo canceller • Works with low cost voice codec. ITU-T G.711 or signed mag µ/A-Law, or linear 2’s comp • Each port may operate in different format • Advanced NLP design - full duplex speech with no switched loss on audio paths • Fast re-convergence time: tracks changing echo environment quickly • Adaptation algorithm converges even during Double-Talk • Designed for exceptional performance in high background noise environments • Provides protection against narrow-band signal divergence • Howling prevention stops uncontrolled oscillation in high loop gain conditions • Offset nulling of all PCM channels • Serial micro-controller interface • ST-BUS, GCI, or variable-rate SSI PCM interfaces • User gain control provided for speaker path (-24dB to +48dB in 3dB steps) • 18 dB gain at Sout to compensate for high ERL environments • AGC on speaker path • Handles up to 0 dB acoustic echo return loss • Transparent data transfer and mute options • 20 MHz master clock operation • Low power mode during PCM Bypass • Bootloadable for future factory software upgrades • 2.7 V to 3.6 V supply voltage; 5 V-tolerant inputs June 2004 Ordering Information ZL38001DGA 36 Pin QSOP ZL38001QDC 48 Pin TQFP -40 °C to +85°C ZL38001 Low-Voltage Acoustic Echo Canceller with Low ERL Compensation Data Sheet Figure 1 - Functional Block Diagram Rout MD1 MD2 Sin Micro Interface Program RAM Program ROM Howling Controller NBSD Linear/ µ/A-Law 18dB Gain R1 R3 R2 S1 S2 S3 FORMAT Linear/ µ/A-Law Offset Null Linear µ/A-Law/ Adaptive Filter Offset Null VDD VSS RESET F0i BCLK/C4i MCLK Sout Rin DATA1 DATA2 CS SCLK ENA2 LAW AGC User Gain + - -24 -> +48dB ADV NLP Linear µ/A-Law/ + UNIT CONTROL Detector Talk Double NBSD ENA1 Limiter Limiter |
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