ANALOG DEVICES ADF41020 Service Manual

CLK

DATA

LE

REF

IN

RF

IN

24-BIT INPUT

REGISTER

AVDDDV

DD

CEAGND DGND

R COUNTER

R COUNTER

LATCH

FUNCTION

LATCH

A, B COUNTER

LATCH

P/P+ 1

N = 4.(BP + A)

A AND B

M3 M2 M1

MUX

SD

OUT

AV

DD

HIGH Z

MUXOUT

CPGND

R

SET

V

P

CP

PHASE

FREQUENCY

DETECTOR

LOCK

DETECT

REFERENCE

CHARGE

PUMP

CURRENT

SETTING 1

ADF41020

CPI3 CPI2 CPI1

CPI6 CPI5 CPI4

CURRENT

SETTING 2

50Ω

3pF

COUNTERS

DIVIDE

BY 4

10304-001

CLK

DB22

DB2

DATA

LE

t

1

LE

DB23 (MSB)

t

2

DB1 (CONTROL

BIT C2)

DB0 (LSB)

(CONTROL BIT C1)

t

3

t

4

t

6

t

5

10304-002