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CD6420 Scheda tecnica(PDF) 2 Page - Cirrus Logic |
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CD6420 Scheda tecnica(HTML) 2 Page - Cirrus Logic |
2 / 52 page 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 |
Codice articolo simile - CD6420 |
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Descrizione simile - CD6420 |
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