CS6422 Datasheet | Cirrus Logic

Features l Single-chip, 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 stability because the acoustic coupling between the speaker and microphone is much higher in speakerphones than in handsets where the coupling is mechanically suppressed. The CS6422 enables full-duplex conversation using echo cancellation and suppression in a single-chip solution. 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 85o C 20-pin SOIC CDB6422 Evaluation Board full-duplex, hands-free operation l Optional Tx Noise Guard l Programmable attenuation during double-talk l Optional 34 d B microphone preamplifier l Dual channel AGC’ed volume controls with mute l Dual integrated 80 d B 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 NC1 9 RGain NI 17 (0, 6, 9.5, 12 d B) ADC NC2 10 + + NC3 11 NC4 12 RVol DVDD 16 Rx Suppression Pre-emphasis Filter AVDD 1 DAC Clock Generation Acoustic ASdt Sidetone (none, -24, -18, -12 d B) Mic 3 14 13 AO CLKI CLKO Σ - (Mute, -12 to +30 d B) Network Echo Canceller Network Sidetone (none, -24, NSdt -18, -12 d B) Pre-emphasis Filter NO 4 DAC Tx Suppression TVol Acoustic Echo Canceller Σ (Mute, -12 to +30 d B) + + 34 d B 1 kΩ TGain ADC (0, 6, 9.5, 12 d B) Voltage Reference 18 APO Microcontroller Interface 8 7 6 5 15 2 Preliminary Product Information P.O. Box 17847, Austin, Texas 78760 http://.cirrus. (512) 445 7222 FAX: (512) 445 7581 http://.cirrus. This document contains information for a new product. Cirrus Logic reserves the right to modify this product without...