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CS6422 Datasheet(PDF) 1 Page - Cirrus Logic |
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CS6422 Datasheet(HTML) 1 Page - Cirrus Logic |
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1 / 48 page  Preliminary Product Information This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice. 1 Copyright Cirrus Logic, Inc. 2001 (All Rights Reserved) P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.cirrus.com CS6422 Enhanced Full-Duplex Speakerphone IC Features l Single-chip, full-duplex, hands-free operation l Optional Tx Noise Guard l Programmable attenuation during double-talk l Optional 34 dB microphone preamplifier l Dual channel AGC’ed volume controls with mute l Dual integrated 80 dB IDR codecs l Speech-trained Network and Acoustic Echo Cancellers l Rx and Tx supplementary echo suppression l Configurable half-duplex training mode l Powerdown mode l Microcontroller Interface General Description Most modern speakerphones use half-duplex operation, which alternates transmission between the far-end talker and the speakerphone user. This is done to ensure sta- bility because the acoustic coupling between the speaker and microphone is much higher in speaker- phones than in handsets where the coupling is mechanically suppressed. The CS6422 enables full-duplex conversation using echo cancellation and suppression in a single-chip solu- tion. The CS6422 can easily replace existing half-duplex speakerphone ICs with a huge increase in conversation quality. The CS6422 consists of telephone & audio interfaces, two codecs and an echo-cancelling DSP. ORDERING INFORMATION See page 48. CS6422-IS -40o to 85oC 20-pin SOIC CDB6422 Evaluation Board TGain TVol Σ + - Acoustic Echo Canceller ADC Pre-emphasis Filter + ASdt DAC Σ + - Network Echo Canceller Pre-emphasis Filter + NSdt DAC ADC Clock Generation Voltage Reference Microcontroller Interface RGain RVol (0, 6, 9.5, 12 dB) Network Sidetone (none, -24, -18, -12 dB) Acoustic Sidetone (none, -24, -18, -12 dB) 1 k Ω Mic 34 dB (0, 6, 9.5, 12 dB) NI NO 17 4 8 76 5 15 2 19 18 APO API 20 CLKO 13 14 CLKI AO 3 AVDD DVDD NC1 NC2 NC3 NC4 910 11 12 16 1 (Mute, -12 to +30 dB) (Mute, -12 to +30 dB) Rx Suppression Tx Suppression JUL ‘01 DS295PP4 Copyright © Cirrus Logic, Inc. 2005 (All Rights Reserved) http://www.cirrus.com CS6422 Enhanced Full-duplex Speakerphone IC SEP ‘05 DS295F1 |
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