CS6422 Datasheet, PDF (1/48 Pages) Cirrus Logic – Enhanced Full-Duplex Speakerphone IC

CS6422
CS6422
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Features
General Description
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
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 -40^o to 85^oC 20-pin SOIC
CDB6422 Evaluation Board
NC1 NC2 NC3 NC4
DVDD
AVDD
NI ¹⁷
RGain
9
ADC
(0, 6, 9.5, 12 dB)
Network
Sidetone
(none, -24, _NSdt
-18, -12 dB)
NO ⁴
DAC
10 11 12
16
RVol
+
Σ
+-
Rx
Suppression
(Mute, -12 to +30 dB)
Pre-emphasis
Network
Filter
Echo
Canceller
Pre-emphasis
Filter
Tx
Suppression
Acoustic
Echo
Canceller
TVol
-+
Σ⁺
1
DAC
Acoustic
ASdt _Sidetone
(none, -24,
-18, -12 dB)
ADC
TGain
3
AO
Clock
Generation
14
CLKI
13
CLKO
Mic
20
API
34 dB
1 kΩ
18
APO
Microcontroller Interface
(Mute, -12 to +30 dB)
(0, 6, 9.5, 12 dB)
Voltage
Reference
8
7
6
5
15
2
19
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
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[phone] FAX: [phone]
http://www.cirrus.com
Copyright © CirrCuospLyorgigich,t IncC. i2rr0u0s5Logic, Inc. 2001
(All Rights Rese(rAvelldR)ights Reserved)
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