AD534

Rev. C | Page 15 of 20

APPLICATIONS INFORMATION

The versatility of the AD534 allows the creative designer to implement a variety of circuits such as wattmeters, frequency doublers, and

automatic gain controls.

AD534

SF

OUT

+15V

30kΩ

10kΩ

–15V

OUTPUT =

10V

A + B

2

A – B

2

A

B

Figure 20. Difference of Squares

AD534

SF

OUT

+15V

2kΩ

39kΩ

1kΩ

SET GAIN

1kΩ

–15V

NOTES

2. WIDEBAND (10Hz TO 30kHz) OUTPUT NOISE IS 3mV rms,

TYP CORRESPONDING TO A.F.S. SNR OF 70dB.

60µV rms, TYP.

4. BANDWIDTH IS DC TO 20kHz, –3dB, INDEPENDENT OF GAIN.

CONTROL INPUT,

SIGNAL INPUT,

0.005µF

OUTPUT, ±12V PK =

0.1V

Figure 21. Voltage-Controlled Amplifier

USING CLOSE TOLERANCE RESISTORS AND AD543L,

ACCURACY OF FIT IS WITHIN ±0.5% AT ALL POINTS.

θ IS IN RADIANS.

AD534

SF

OUT

+15V

18kΩ

3kΩ

10kΩ

4.7kΩ

4.3kΩ

0V TO +10V

–15V

WHERE θ =

×

π

2

10V

OUTPUT = (10V) sin θ

Figure 22. Sine Function Generator

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

SIGNAL AMPLIFICATION. OPERATION FROM A SINGLE SUPPLY POSSIBLE;

AD534

SF

OUT

+15V

MODULATION

CARRIER INPUT

–15V

10V

OUTPUT = 1 ±

Figure 23. Linear AM Modulator

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

CAN BE OBTAINED BY ALTERING THE FEEDBACK RATIO.

AD534

SF

OUT

+15V

9kΩ

1kΩ

B INPUT,

–15V

A – B

B

OUTPUT = (100V)

(1% PER VOLT)

A INPUT (±)

Figure 24. Percentage Computer

AD534

SF

OUT

+15V

INPUT, Y ±10V FS

–15V

y

1 + y

Y

(10V)

OUTPUT, ±5V/PK =

(10V)

WHERE y =

Figure 25. Bridge Linearization Function