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Theory of Operation
2 - 22
68P02963C70-O
becoming , which goes via the main FET and provides power to the
GCAP III IC.
Figure 10 MTH500 DC Distribution
Ba
tt
er
y
F
ilt
er
3.6VDC
RF PA Tetra
Filter
Filter
Filter
PWM2(Boost)
5.6V @ 100mA
V3
2.775V @ 150mA
PWM1(Buck)
1.86V @ 100mA
EXT_VSIM1
3.0V @ 50mA
CurrentLimit
800mA
VREF1
2.775V @ 5 mA
V2
2.775V @ 200mA
V1
1.875V @ 150mA
VREF2
2.775V @ 100mA
V4
2.775V @ 250mA
V
DSC
5V @ 60mA
V
TS
2.3V @ 5mA
V
VIB
1.3V @ 200mA
V
USB
3.3V @ 40mA
ON
ON
ON
OFF
OFF
OFF
ON
0.9V OFF
0.95V OFF
1.875V ON
ON
ON
V4_2.775V_RF
V4_2.775V_RF
VREF2_2.775V_RF
WPICSFOUT:
2.5V, 40mA
MainVCO&
Buffer
OffsetVCO
: 10mA
:
7mA
VCO&
Buffer
2ndLOVCO
: 10mA
:
7mA
5V_RF
TETRATX
TETRATX
WPICCP
5
Driver&mixer
45
TETRARX
WPIC: 20
LNODCT: 130
Mixer:2.5
AntSW: 8
LO_DRV: 40
TETRA_TX:202
TCXO: 2
WPIC: 30
Mixer:2.7
LNA:7.5
TETRA_RX:62
Dedicated: 2.5
VBLIN:3
ODCT CP: 1
PA Bias: <1
REDCAP
AVDD-AddressBus
DVDD-Data Bus
CVDD-Bus Control
BVDD-SIM
EVDD-AudioESSI
HVDD-SPIA/B,BBESSL,L1T
LVDD-DSPAddress Bus Visibility
MVDD-DSPData Bus Visibility
FVDD-ClockOutputDriver
KVDD-EMULPort
OVCCH-I/Opre driversvoltage
OVCC-Internalcore
GVDD-GPIO,JTAG, Debug
STO, DATA, Bottom
FLASHVCC
SRAM
AUDIO PA
Vibrator
Accessory VCC
Audio Circuits
USB Drivers
BL_SNKGCAP III
V3
SWB+ EN
UV_SEL
USBDETECT
ThermBatt,RF_PA Term,
HW_ID
Keypad/Display
Backlight
Display
R_G_LED
MA
IN
-BO
ARD
KE
Y
PAD
LEDR/LEDG
GCAP III
LNODCT:
Upmixer40mA
TCXO: 2mA
NotUsed
Содержание MTH500
Страница 10: ...Contents x 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 14: ...Foreword xiv 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 18: ...Overview 1 4 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 50: ...Theory of Operation 2 32 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 76: ...Troubleshooting 3 26 68P02963C70 O Offset VCO Test ...
Страница 78: ...Troubleshooting 3 28 68P02963C70 O This page left blank intentionally ...
Страница 82: ...Programming the Radio 4 4 68P02963C70 O This page left blank intentionally ...
Страница 100: ...Maintenance 5 18 68P02963C70 O Figure 23 Exploded View 1 2 3 4 5 7 6 X6 8 ...
Страница 101: ...Maintenance 68P02963C70 O 5 19 Figure 24 Exploded View of Chassis Assembly 9 12 13 10 11 14 ...
Страница 102: ...Maintenance 5 20 68P02963C70 O ...
Страница 103: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 68P02963C70 O 6 1 Component Board Layouts ...
Страница 104: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 6 2 68P02963C70 O This page intentionally left blank ...
Страница 109: ...MTH500 Detailed Service Manual Schematic Diagrams and Parts Lists 68P02963C70 O 6 7 Schematic Diagrams and Parts Lists ...
Страница 134: ...SCHEMATIC DIAGRAMS MTH500 Flex CD 6 32 68P02963C70 O This page left blank intentionally ...
Страница 140: ...Replacement Parts and Kits 6 68P02963C70 O ...
Страница 141: ...Replacement Parts and Kits 68P02963C70 O 7 ...
Страница 142: ...Replacement Parts and Kits 8 68P02963C70 O ...
Страница 144: ...Test Equipment Service Aids Tools A2 2 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...