AD534–Applications Section

–8–

The versatility of the AD534 allows the creative designer to

implement a variety of circuits such as wattmeters, frequency

doublers and automatic gain controls to name but a few.

AD534

OUTPUT =

10V

OUT

SF

+15V

–15V

A – B

2

A

B

A + B

2

30k

10k

Figure 8. Difference-of-Squares

AD534

OUTPUT,

12V PK

=

0.1V

OUT

SF

+15V

–15V

SIGNAL INPUT,

39k

1k

0.005 F

CONTROL INPUT,

SET

GAIN

1k

2k

NOTES:

2) WIDEBAND (10Hz – 30kHz) OUTPUT NOISE IS 3mV RMS, TYP

CORRESPONDING TO A.F.S. S/N RATIO OF 70dB

4) BANDWITH IS DC TO 20kHz, –3dB, INDEPENDENT OF GAIN

Figure 9. Voltage-Controlled Amplifier

AD534

OUTPUT = (10V) sin

OUT

SF

+15V

–15V

4.7k

4.3k

18k

10k

USING CLOSE TOLERANCE RESISTORS AND AD534L, ACCURACY

OF FIT IS WITHIN

0.5% AT ALL POINTS.

IS IN RADIANS.

INPUT, E

0 TO +10V

WHERE

=

E

2

10V

3k

Figure 10. Sine-Function Generator

OUTPUT = 1

10V

OUT

SF

+15V

–15V

THE SF PIN OR A Z-ATTENUATOR CAN BE USED TO PROVIDE OVERALL

SIGNAL AMPLIFICATION, OPERATION FROM A SINGLE SUPPLY POSSIBLE;

CARRIER

INPUT

MODULATION

INPUT,

AD534

Figure 11. Linear AM Modulator

9k

1k

AD534

OUTPUT = (100V)

B

A – B

(1% PER VOLT)

OUT

SF

+15V

–15V

OTHER SCALES, FROM 10% PER VOLT TO 0.1% PER VOLT

CAN BE OBTAINED BY ALTERING THE FEEDBACK RATIO.

B INPUT

A INPUT

( )

Figure 12. Percentage Computer

OUTPUT,

5V/PK

= (10V)

1 + y

y

(10V)

Y

WHERE y =

OUT

SF

+15V

–15V

INPUT, Y

10V FS

AD534

Figure 13. Bridge-Linearization Function