參數(shù)資料
型號(hào)： CD6420
廠商： Cirrus Logic, Inc.
英文描述： FULL DUPLEX SPEAKERPHONE CHIP
中文描述： 的全雙工免提通話芯片
文件頁數(shù)： 2/52頁
文件大?。?/td> 815K
代理商： CD6420
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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