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Cirrus Logic
Cirrus Logic

CS6422 Datasheet Preview

CS6422 Datasheet

Enhanced Full-Duplex Speakerphone IC

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CS6422 pdf
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CS6422
CS6422
EEnnhhaanncceeddFFuulll--Dduupplleexx SSppeeaakkeerrpphhoonnee IICC
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
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 k
18
APO
Microcontroller Interface
(Mute, -12 to +30 dB)
(0, 6, 9.5, 12 dB)
Voltage
Reference
8765
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.
Pht.tOp:.//Bwowxw1.7c8ir4ru7s,.Acoumstin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
Copyright © CirrCuospLyorgigich,t IncC. i2rr0u0s5Logic, Inc. 2001
(All Rights Rese(rAvelldR)ights Reserved)
SJUEPL ‘0015
DSD2S9259P5PF41
1



Cirrus Logic
Cirrus Logic

CS6422 Datasheet Preview

CS6422 Datasheet

Enhanced Full-Duplex Speakerphone IC

No Preview Available !

CS6422 pdf
www.DataSheet4U.com
CS6422
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 5
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 5
RECOMMENDED OPERATING CONDITIONS ....................................................................... 5
POWER CONSUMPTION ........................................................................................................ 5
ANALOG CHARACTERISTICS ................................................................................................ 5
ANALOG TRANSMISSION CHARACTERISTICS.................................................................... 6
MICROPHONE AMPLIFIER ..................................................................................................... 6
DIGITAL CHARACTERISTICS ................................................................................................. 6
SWITCHING CHARACTERISTICS .......................................................................................... 7
2. OVERVIEW ............................................................................................................................... 9
3. FUNCTIONAL DESCRIPTION ................................................................................................. 9
3.1 Analog Interface ................................................................................................................. 9
3.1.1 Acoustic Interface ................................................................................................ 10
3.1.2 Network Interface ................................................................................................ 11
3.2 Microcontroller Interface .................................................................................................. 11
3.2.1 Description .......................................................................................................... 11
3.2.2 Register Definitions ............................................................................................. 12
3.3 Register 0 ......................................................................................................................... 13
3.3.1 Mic - Microphone Preamplifier Enable .................................................................... 14
3.3.2 HDD - Half-Duplex Disable...................................................................................... 14
3.3.3 GB - Graded Beta.................................................................................................... 14
3.3.4 RVol - Receive Volume Control............................................................................... 14
3.3.5 TSD - Transmit Suppression Disable ...................................................................... 14
3.3.6 ACC - Acoustic Coefficient Control ......................................................................... 15
3.3.7 TSMde - Transmit Suppression Mode..................................................................... 15
3.4 Register 1 ......................................................................................................................... 16
3.4.1 THDet - Transmit Half-Duplex Detection Threshold ................................................ 17
3.4.2 Taps - AEC/NEC Tap Allocation ............................................................................. 17
3.4.3 TVol - Transmit Volume Control .............................................................................. 17
3.4.4 RSD - Receive Suppression Disable....................................................................... 17
3.4.5 NCC - Network Coefficient Control.......................................................................... 17
3.4.6 AuNECD - Auto re-engage NEC Disable ................................................................ 17
3.5 Register 2 ......................................................................................................................... 18
3.5.1 RHDet - Receive Half-Duplex Detection Threshold ................................................ 19
3.5.2 RSThd - Receive Suppression Threshold ............................................................... 19
3.5.3 NseRmp - Noise estimator Ramp rate .................................................................... 19
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts/sales.cfm
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor-
mation describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information
contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided AS ISwithout warranty of any
kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third
parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publi-
cation may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise)
without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no part of the
printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photo-
graphic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for manufacture or
sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in
this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trade-
marks and service marks can be found at http://www.cirrus.com.
2 DS295F1


Part Number CS6422
Description Enhanced Full-Duplex Speakerphone IC
Maker Cirrus Logic
Total Page 30 Pages
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