RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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12.3.3 Tone Transmit Mode .................................................................................................................... 12-3
12.3.4 Handset Mode .............................................................................................................................. 12-3
12.3.5 Microphone Volume Control.......................................................................................................... 12-4
12.3.6 Speaker Volume Control............................................................................................................... 12-4
12.3.7 Microphone and Speaker Muting .................................................................................................. 12-5
12.3.8 Microphone and Speaker AGC ..................................................................................................... 12-5
12.3.9 Speech Detectors ......................................................................................................................... 12-5
12.3.10 Scaling of Transmit Output to Line .............................................................................................. 12-6
12.3.11 Speakerphone Modes and Active Bits ......................................................................................... 12-6
13. PERFORMANCE......................................................................................................................................... 13-1
13.1 TYPICAL BIT ERROR RATES................................................................................................................ 13-1
13.2 TYPICAL PHASE JITTER....................................................................................................................... 13-1
13.3 DTMF PERFORMANCE ......................................................................................................................... 13-1
14. MODEM INTERFACE CIRCUIT................................................................................................................... 14-1
14.1 CIRCUIT AND COMPONENTS .............................................................................................................. 14-1
14.1.1 Crystal/Oscillator Specifications .................................................................................................... 14-1
14.1.2 Transmit Level and Receive Threshold Trimmers.......................................................................... 14-1
14.1.3 Echo Canceller Working Condition ................................................................................................ 14-1
14.1.4 Room Acoustic Echo Canceller Working Condition........................................................................ 14-1
14.2 PC BOARD LAYOUT CONSIDERATIONS.............................................................................................. 14-8
14.2.1 General Board Layout Guidelines ................................................................................................. 14-8
14.2.2 Electromagnetic Interference (EMI) Considerations....................................................................... 14-9
14.2.3 Crystal Oscillator EMI Considerations ........................................................................................... 14-9
15. PACKAGE DIMENSIONS............................................................................................................................ 15-1
Содержание RFX144V24-S23
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