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CS6420-CS Datasheet(PDF) 2 Page - Cirrus Logic

Part No. CS6420-CS
Description  FULL DUPLEX SPEAKERPHONE CHIP
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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 2 page
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CS6420
2
DS205PP2
TABLE OF CONTENTS
Absolute Maximum Ratings ..............................................................................................4
Recommended Operating Conditions..............................................................................4
Power Consumption ..........................................................................................................4
Analog Characteristics ........................................................................................................4
Analog Transmission Characteristics..............................................................................5
Microphone Amplifier ........................................................................................................5
Digital Characteristics .......................................................................................................5
Overview ............................................................................................................................8
Functional Description .....................................................................................................8
Analog Interface .......................................................................................................8
Acoustic Interface ..............................................................................................9
Network Interface ............................................................................................10
Microcontroller Interface .........................................................................................10
Description ......................................................................................................10
Register Definitions .........................................................................................11
Register 0..................................................................................................12
Mic - Microphone Preamplifier Enable ...............................................12
TSD - Transmit Suppression Disable.................................................12
GB - Graded Beta ..............................................................................12
ACC - Acoustic Coefficient Control ....................................................13
RVol - Receive Volume Control .........................................................13
TGain - Transmit Analog Gain ...........................................................13
Register 1..................................................................................................14
HD - Half-Duplex Disable...................................................................14
RSD - Receive Suppression Disable .................................................14
Taps - AEC/NEC Tap Allocation ........................................................15
NCC - Network Coefficient Control ....................................................15
TVol - Transmit Volume Control.........................................................15
RGain - Receive Analog Gain............................................................15
Register 2..................................................................................................16
NErle - Network ERLE Threshold ......................................................16
NFNse - Network Full-Duplex Noise Threshold .................................16
RHDet - Receive Half-Duplex Detection Threshold ...........................17
HDly - Half-Duplex Holdover Delay....................................................17
NseRmp - Background Noise Power Estimator Ramp Rate..............17
RSThd - Receive Suppression Threshold..........................................17
PCSen- Path Change Sensitivity .......................................................17
Register 3..................................................................................................18
AErle - Acoustic ERLE Threshold ......................................................18
AFNse - Acoustic Full-Duplex Noise Threshold.................................18
THDet - Transmit Half-Duplex Detection Threshold ..........................18
TSAtt - Transmit Suppression Attenuation.........................................19
TSBias - Transmit Suppression Bias .................................................19
TSThd - Transmit Suppression Threshold .........................................19
HHold - Hold in Half-Duplex on Howl.................................................19
Reset ...............................................................................................................19
Clocking ..................................................................................................................19
Power Supply .........................................................................................................20
Power Down Mode ..........................................................................................20
Noise and Grounding ......................................................................................21
Design Considerations ...................................................................................................22
Algorithmic Considerations .....................................................................................22
Full-Duplex Mode ............................................................................................22
Theory of Operation ..................................................................................22
Adaptive Filter ...........................................................................................23
Pre-Emphasis ....................................................................................23
Graded Beta.......................................................................................23
Update Control ..........................................................................................24




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