Table of Contents
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Table of Contents
Theory of Operation ..................................................................................................................................77
Antenna Circuit....................................................................................................................................... 77
RX Front End IC ..................................................................................................................................... 77
Custom IC ............................................................................................................................................... 77
VCO ......................................................................................................................................................... 78
TX Offset Oscillator ............................................................................................................................... 78
Merlin IC .................................................................................................................................................. 78
Amp Drivers ............................................................................................................................................ 79
PA Circuit................................................................................................................................................. 79
RF Detect Circuit ................................................................................................................................... 79
Analog / Digital Switch .........................................................................................................................80
DCI (U1800) ...........................................................................................................................................80
GCAP2 (U1500) ....................................................................................................................................80
Audio / Thermistor ................................................................................................................................81
Charger / Batt Select ............................................................................................................................81
DOUB Supply / Backlight ....................................................................................................................82
Reference Oscillator.............................................................................................................................82
Stuart IC (U1700) ..................................................................................................................................82
DSP (U1900) .........................................................................................................................................83
Call Processor (U1000) .......................................................................................................................84
Memory ...................................................................................................................................................84
Analog TX Audio Processing ..............................................................................................................84
Digital TX Audio Processing ...............................................................................................................85
Service Diagrams - Section A ................................................................................................................ A1
Antenna Circuit....................................................................................................................................... A2
RX Front End IC (U11) .......................................................................................................................... A4
Custom IC (U110) .................................................................................................................................. A6
VCO/Vibrator .......................................................................................................................................... A8
TX Offset Oscillator ............................................................................................................................ A 10
Merlin TX (U301) ................................................................................................................................ A 12
Amp Drivers ......................................................................................................................................... A 14
PA Circuit.............................................................................................................................................. A 16
RF Detect Circuit ................................................................................................................................ A 18
Analog/Digital Switch ......................................................................................................................... A 20
DCI (U1800) ......................................................................................................................................... A 22
GCAP2 (U1500) .................................................................................................................................. A 24
Audio/Thermistor................................................................................................................................. A 26
Charger/Batt Select ............................................................................................................................ A 28
DOUB Supply/Backlight..................................................................................................................... A 30
Reference Oscillator........................................................................................................................... A 32
STUART (U1700)................................................................................................................................ A 34
DSP (U1900) ....................................................................................................................................... A 36
x
© 2000 Motorola, Inc.
TDMA Timeport™ P8190
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