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 V
OUT
Z V
OUT
Scale
Factor
−10 V +10 V −10 V +10 V −10 V
X
0
(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
(X
0
)
47kΩ
2.2kΩ
10kΩ
1kΩ
(SF)
+V
S
–V
S
+V
S
–V
S
V
OUT
= 10VZ
Z
OUT
Z
V
OUT
X
1
X
2
Y
1
Y
2
00502-016
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 D
1
is connected as shown to
prevent latch-up as Z
IN
approaches 0 V. In this case, the V
OS
adjustment is made with Z
IN
= +0.1 V dc, adjusting V
OS
to obtain
−1.0 V dc in the output, V
OUT
=
ZV10
. For optimum
performance, gain (SF) and offset (X
0
) adjustments are
recommended as shown and explained in Table 5.
DIFFERENCE OF SQUARES
AD532
20kΩ
+V
S
–V
S
+V
S
–V
S
V
OS
V
OUT
X
1
X
2
Y
1
Y
2
Z
OUT
20kΩ20kΩ
10kΩ
–Y
X
Y
(OPTIONAL)
V
OUT
=
X
2
– Y
2
10V
AD741KH
00502-017
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, X
2
− Y
2
/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 (−Y
IN
) 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.
