AD652AQ2 datasheet(17/28 Pages) AD

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AD652

Rev. C | Page 17 of 28

+15V

200pF

–15V

ONE

SHOT

AND

"D"

FLOP

QCK

1mA

20k

Ω

AD652

SYNCHRONOUS

VOLTAGE-TO-

FREQUENCY

CONVERTER

REFERENCE

+5V

0.02

µF

–

0V–10V

fOUT

+15V

–15V

ONE

SHOT

AND

"D"

FLOP

QCK

1mA

20k

Ω

AD652

SYNCHRONOUS

VOLTAGE-TO-

FREQUENCY

CONVERTER

REFERENCE

400pF

VOUT

Ω

+5V

1MHz

CLOCK

INPUT

OSC/DRIVER

74LS86

200pF

500pF

Ω

RPU

2.87k

Ω

8.06k

Ω

0V–10V

+5V

AD654

Figure 23. Frequency Output Multiplier

FREQUENCY OUTPUT MULTIPLIER

The AD652 can serve as a frequency output multiplier when

used in conjunction with a standard voltage-to-frequency

converter. Figure 23 shows the low cost AD654 VFC being used

as the clock input to the AD652. Also shown is a second AD652

in the F/V mode. The AD654 is set up to produce an output

frequency of 0 kHz to 500 kHz for an input voltage (V1) range

of 0 V to 10 V. The use of R4, C1, and the XOR gate doubles this

output frequency from 0 kHz–500 kHz to 0 MHz–1 MHz.

This 1 MHz full-scale frequency is then used as the clock input

to the AD652 SVFC. Because the AD652 full-scale output

frequency is one-half the clock frequency, the 1 MHz FS clock

frequency establishes a 500 kHz maximum output frequency for

the AD652 when its input voltage (V2) is 10 V. The user there-

fore has an output frequency range from 0 kHz to 500 kHz,

which is proportional to the product of V1 and V2.

AD652AQ2 Datasheet(PDF) 17 Page - Analog Devices

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