Icom IC-720A Instruction Manual page 32

7-5 PLL UNIT
100KHz Step Loop VCO
Pre-Scaler (1С9 иРВ551)
Programmable Divider
(1С7 TC9123BP)
Reference frequency Crystal
PLL Output Filter
2nd LO Crystal
(10.24MHz) (5.12MHz)
| Programmable Divider
5 (ІС6 TC9123BP)
|
|
Main Loop | 100Hz Step Loop VCO
VCO Phase Detector
(СЗ TC5081P)
Main Loop
Mixer (uPC1037H)
7-6 LOGIC UNIT
peer er eee
РОЗЕ ЕН
... ..
CODE LATCH BUFFER'
(40175):
CODE CONVERTER (4028)
CODE CONVERTER
UP/DOWN CLOCK
(4028) | | | i DETECTOR (4001)
DC CONVERTER МО а. 2502 ШІП NE р: : we Е 15 CONTROLLER (4013)
(ОР-5)
а
Виа |
j
UP/DOWN COUNTER
(40193)
| Дари UP/DOWN CLOCK
туи (+ И | DETECTOR (4011)
FREQUENCY DISPLAY
CONTROLLER (иРО549С
UP/DOWN CLOCK SHAPER
FUNCTION DISPLAY (4069)
CONTROLLER (4081) 5
в DIAL LOCK CONTROLLER
(4013)
CPU (uPD650-70) INPUT CONTROLLER (4028)
7-7 КЕ UNIT
DMB 412E (ІС1)
Noise Blanker Circuit Band-Pass Filter
DBM 412E (1С2) Xtal Filter 39.7315MHz (FL29)
—29—