AD534JD datasheet(15/21 Pages) AD

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AD534

Rev. C | Page 14 of 20

As with the multiplier connection, overall gain can be introduced

by inserting a simple attenuator between the output and Y2

terminal. This option and the differential ratio capability of the

AD534 are used in the percentage computer application shown

in Figure 24. This configuration generates an output propor-

tional to the percentage deviation of one variable (A) with

respect to a reference variable (B), with a scale of 1% per volt.

In contrast to earlier devices, which were intolerant of capacitive

loads in the square root modes, the AD534 is stable with all

loads up to at least 1000 pF. For critical applications, a small

adjustment to the Z input offset (see Figure 3) improves

accuracy for inputs below 1 V.

UNPRECEDENTED FLEXIBILITY

The precise calibration and differential Z input provide a degree

of flexibility found in no other currently available multiplier.

Standard multiplication, division, squaring, square-rooting

(MDSSR) functions are easily implemented while the restriction

to particular input/output polarities imposed by earlier designs

has been eliminated. Signals can be summed into the output,

with or without gain and with either a positive or negative

sense. Many new modes based on implicit function synthesis

have been made possible, usually requiring only external

passive components. The output can be in the form of a current,

if desired, facilitating such operations as integration.

OPERATION AS A SQUARE ROOTER

The operation of the AD534 in the square root mode is shown

in Figure 19. The diode prevents a latching condition, which

may occur if the input momentarily changes polarity. As shown,

the output is always positive; it can be changed to a negative

output by reversing the diode direction and interchanging the X

inputs. Because the signal input is differential, all combinations

of input and output polarities can be realized, but operation is

restricted to the one quadrant associated with each combination

of inputs.

AD534

+VS

OUT

–VS

+15V

–15V

Z INPUT

±10V FS

±12V PK

REVERSE THIS

AND X INPUTS

FOR NEGATIVE

OUTPUTS

(MUST BE

PROVIDED)

OPTIONAL

SUMMING

INPUT

X, ±10V PK

–

OUTPUT, ±12V PK =

10V (Z2 – Z1) + X2

Figure 19. Square-Rooter Connection

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