AD532

–6–

REV. B

APPLICATIONS

MULTIPLICATION

Z

OUT

AD532

20k

(OPTIONAL)

10V

Figure 11. Multiplier Connection

For operation as a multiplier, the AD532 should be connected

as shown in Figure 11. The inputs can be fed differentially to

the X and Y inputs, or single-ended by simply grounding the

unused input. Connect the inputs according to the desired po-

larity in the output. The Z terminal is tied to the output to close

the feedback loop around the op amp (see Figure 1). The offset

volts to obtain zero out, or to buck out other system offsets.

SQUARE

Z

OUT

AD532

20k

(OPTIONAL)

10V

Figure 12. Squarer Connection

The squaring circuit in Figure 12 is a simple variation of the

multiplier. The differential input capability of the AD532, how-

ever, can be used to obtain a positive or negative output re-

sponse to the input . . . a useful feature for control applications,

as it might eliminate the need for an additional inverter somewhere

else.

DIVISION

Z

OUT

AD532

Z

20k

10VZ

X

X

1k

(SF)

10k

47k

2.2k

Figure 13. Divider Connection

The AD532 can be configured as a two-quadrant divider by

connecting the multiplier cell in the feedback loop of the op

amp and using the Z terminal as a signal input, as shown in

Figure 13. It should be noted, however, that the output error is

error specification for the multiply mode; and bandwidth by

Further, to avoid positive feedback, the X input is restricted to

negative values. Thus for single-ended negative inputs (0 V to

single-ended positive inputs (0 V to +10 V), connect the input

and explained in Table I.

For practical reasons, the useful range in denominator input is

approximately 500 mV

≤ |(X

≤ 10 V. The voltage offset

full scale.

Table I.

Adjust Procedure (Divider or Square Rooter)

DIVIDER

SQUARE ROOTER

Adjust

Adjust

With:

for:

With:

for:

Adjust

X

Z

Scale Factor

–10 V

+10 V

–10 V

+10 V

–10 V

–1 V

+0.1 V –1 V

+0.1 V

–1 V

Repeat if required.

SQUARE ROOT

Z

OUT

AD532

Z

20k

1k

(SF)

10k

47k

2.2k

Figure 14. Square Rooter Connection

The connections for square root mode are shown in Figure 14.

Similar to the divide mode, the multiplier cell is connected in

the feedback of the op amp by connecting the output back to

√10 V Z. For optimum

mended as shown and explained in Table I.

DIFFERENCE OF SQUARES

Z

OUT

AD532

20k

(OPTIONAL)

10V

20k

10k

AD741KH

20k

–Y

X

Y

Figure 15. Differential of Squares Connection

The differential input capability of the AD532 allows for the

algebraic solution of several interesting functions, such as the

AD532 is configured in the square mode, with a simple unity

gain inverter connected between one of the signal inputs (Y)

The inverter should use precision (0.1%) resistors or be other-

wise trimmed for unity gain for best accuracy.