AD532

Data Sheet

Rev. E | Page 12 of 14

Table 5. Adjustment Procedure (Divider or Square Rooter)

Divider

Square Rooter

With:

Adjust for:

With:

Adjust for:

Adjust

X

Z

VOUT

Z

VOUT

Scale

Factor

−10 V

+10 V

−10 V

+10 V

−10 V

X0 (Offset)

−1 V

+0.1 V

−1 V

+0.1 V

−1 V

The optional scale factor and offset adjustments listed in Table 5

may be interactive. Repeat until satisfactory results are obtained.

SQUARE ROOT

AD532

20kΩ

(X0)

47kΩ

2.2kΩ

10kΩ

1kΩ

(SF)

+VS

–VS

+VS

–VS

VOUT = 10VZ

Z

OUT

Z

VOUT

X1

X2

Y1

Y2

Figure 17. Square Rooter Connection

The connections for square root mode are shown in Figure 17.

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

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

both the X and Y inputs. The diode D1 is connected as shown to

prevent latch-up as ZIN approaches 0 V. In this case, the VOS

adjustment is made with ZIN = +0.1 V dc, adjusting VOS to obtain

−1.0 V dc in the output, VOUT =

Z

V

10



. For optimum

performance, gain (SF) and offset (X0) adjustments are

recommended as shown and explained in Table 5.

DIFFERENCE OF SQUARES

AD532

20kΩ

+VS

–VS

+VS

–VS

VOS

VOUT

X1

X2

Y1

Y2

Z

OUT

20kΩ

20kΩ

10kΩ

–Y

X

Y

(OPTIONAL)

VOUT =

X2 – Y2

10V

AD741KH

Figure 18. Differential of Squares Connection

The differential input capability of the AD532 allows for the

algebraic solution of several interesting functions, such as the

difference of squares, X2 − Y2/10 V. As shown in Figure 18, the

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

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

and one of the inverting input terminals (−YIN) of the multiplier.

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

trimmed for unity gain for best accuracy.

ADDITIONAL INFORMATION

For additional information about the applications for the AD532,

refer to the Multiplier Application Guide.