AD532KD+ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'AD532KD+' PDF : 7 Pages View PDF
AD532
APPLICATIONS
MULTIPLICATION
X1
X2
Y1
Y2
(OPTIONAL)
Z
AD532 OUT
VOUT
VOS
20k⍀
VOUT
=
(X1
–
X2) (Y1
10V
–
Y2)
+VS
–VS
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
adjust VOS is optional and is adjusted when both inputs are zero
volts to obtain zero out, or to buck out other system offsets.
SQUARE
X1
Z
X2
AD532 OUT
Y1
Y2 +VS VOS –VS
VOUT
VOUT
=
VIN2
10V
VIN
(OPTIONAL)
20k⍀
+VS
–VS
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
VOUT =
10VZ
X
X
X1
Z
X2
AD532
Y1
OUT
VOUT
Y2 +VS
–VS
1k⍀
(SF)
2.2k⍀
47k⍀
20k⍀
(X0)
+VS
–VS
10k⍀
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
given approximately by 10 V ⑀m/(X1 – X2), where ⑀m is the total
error specification for the multiply mode; and bandwidth by
fm × (X1 – X2)/10 V, where fm is the bandwidth of the multiplier.
Further, to avoid positive feedback, the X input is restricted to
negative values. Thus for single-ended negative inputs (0 V to
–10 V), connect the input to X and the offset null to X2; for
single-ended positive inputs (0 V to +10 V), connect the input
to X2 and the offset null to X1. For optimum performance, gain
(S.F.) and offset (X0) adjustments are recommended as shown
and explained in Table I.
For practical reasons, the useful range in denominator input is
approximately 500 mV ≤ |(X1 – X2)| ≤ 10 V. The voltage offset
adjust (VOS), if used, is trimmed with Z at zero and (X1 – X2) at
full scale.
Table I. Adjust Procedure (Divider or Square Rooter)
DIVIDER
SQUARE ROOTER
Adjust
Adjust
With:
for:
With: for:
Adjust
X
Z
VOUT
Scale Factor –10 V +10 V –10 V
X0 (Offset) –1 V +0.1 V –1 V
Z
+10 V
+0.1 V
VOUT
–10 V
–1 V
Repeat if required.
SQUARE ROOT
Z
VOUT = 10VZ
X1
Z
X2
AD532
Y1
OUT
VOUT
Y2 +VS
–VS
1k⍀
(SF)
2.2k⍀
47k⍀
20k⍀
(X0)
+VS
–VS
10k⍀
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
both the X and Y inputs. The diode D1 is connected as shown
to prevent latch-up as ZIN approaches 0 volts. 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 = – √10 V Z. For optimum
performance, gain (S.F.) and offset (X0) adjustments are recom-
mended as shown and explained in Table I.
DIFFERENCE OF SQUARES
X
X1
Z
X2
AD532 OUT
VOUT
Y
20k⍀
20k⍀
Y1
–Y Y2 +VS VOS –VS
VOUT =
X2 – Y2
10V
10k⍀
AD741KH
(OPTIONAL)
20k⍀
+VS
–VS
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
difference of squares, X2 – Y2/10 V. As shown in Figure 15, 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 other-
wise trimmed for unity gain for best accuracy.
–6–
REV. B
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