EVAL-ADF4007EBZ1 datasheet(13/17 Pages) AD

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ADF4007

Data Sheet

Rev. B | 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

4.7k

Ω

RSET

VTUNE

RFOUTA

1nF

CPGND

AGND

DGND

AVDD

DVDD

VVCO

10mF

VVCO

REFIN

FREFIN

1nF

MUXOUT

LOCK

DETECT

RFINB

AVDD

100pF

VVCO

CMOS OUTPUT

Ω

2.2nH

MUXOUT

REFIN

PHASE

FREQUENCY

DETECTOR

MUX

CHARGE

PUMP

R COUNTER

÷ 2

RSET

N COUNTER

÷ 8, ÷ 16

÷ 32, ÷ 64

CPGND GND

4.7k

Ω

VDD

RFOUTB

2.2nH

1nF

VDD

RFINA

Ω

DVDD

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

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