Service Manual

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CIRCUIT DESCRIPTION

4-4

Part No. 001-3474-002

Figure 4-2 U801 SYNTHESIZER BLOCK DIAGRAM

CLOCK

DATA

STROBE

Vss

RF

IN

RF

IN

64/65/72

PRESCALER

MAIN DIVIDERS

EM

FB

2 2 12 8

PR NM1 NM3

NM2

FRACTIONAL

ACCUMULATOR

PRESCALER

MODULUS

CONTROL

3FMOD

NF

FB

SERIAL INPUT + PROGRAM LATCHES V

DD

TEST

IN

REF

EM+EA

REFERENCE DIVIDER +2 +2 +2

MAIN

MAIN

PHASE

DETECTOR

REFERENCE

SELECT

2

SM

EM

REFERENCE

SELECT

2

SA

SECONDARY

PHASE

DETECTOR

EA

AUXILIARY

IN

EA

AUX

12

NR

12

NAPA

AUXILIARY DIVIDER

PRESCALER

1/4

NORMAL

OUTPUT

CHARGE

PUMP

OUTPUT

CHARGE

PUMP

SPEED-UP

OUTPUT

CHARGE

PUMP

INTEGRAL

OUTPUT

CHARGE

PUMP

AUXILIARY

CN

8

CL

2

CK

4

2

V

SSA

V

DDA

LOCK

PHA

RA

PHI

PHP

RN

RF