ADF4007

Rev. 0 | Page 12 of 16

USING THE ADF4007 AS A DIVIDER

In addition to its use as a standard PLL synthesizer, the

ADF4007 can also be used as a high frequency counter/divider

with a value of 8, 16, 32, or 64.This can prove useful in a wide

variety of applications where a higher frequency signal is readily

available. Figure 14 shows the ADF4007 used in this manner

with the ADF4360-7.

This part is an integrated synthesizer and VCO, in this case

operating over a range of 1200 MHz to 1500 MHz. With divide-

by-8 chosen in the ADF4007 (N2 = 0, N1 = 0), the output range

is 150 MHz to 187.50 MHz.

ADF4360-7

ADF4007

470pF

6.8nF

6.2k

Ω

13k

Ω

220pF

CLK

DATA

LE

4.7k

Ω

CP

17

18

1nF

CPGND

AGND

DGND

10

µF

CE

1nF

MUXOUT

LOCK

DETECT

100pF

100pF

CMOS OUTPUT

51

Ω

19

12

13

1

3

10

8

11

22

15

5

4

7

24

20

23

2

21

6

14

16

9

L2

51

Ω

2.2nH

MUXOUT

PHASE

FREQUENCY

DETECTOR

MUX

CHARGE

PUMP

CP

R COUNTER

÷2

NCOUNTER

÷8, ÷16

÷32, ÷64

N1

N2

CPGND GND

M2

M1

4.7k

Ω

2.2nH

L1

1nF

51

Ω

Figure 14. Using the ADF4007 to Divide-Down the Output of the ADF4360-7