AD534
OPERATION AS A DIVIDER
OPERATION AS A SQUARE ROOTER
The AD535, a pin for pin functional equivalent to the AD534,
has guaranteed performance in the divider and square-rooter
configurations and is recommended for such applications.
The operation of the AD534 in the square root mode is shown
in Figure 6. The diode prevents a latching condition which
could occur if the input momentarily changes polarity. As
shown, the output is always positive; it may be changed to a
negative output by reversing the diode direction and interchang-
ing the X inputs. Since the signal input is differential, all combi-
nations of input and output polarities can be realized, but
operation is restricted to the one quadrant associated with each
combination of inputs.
Figure 5 shows the connection required for division. Unlike ear-
lier products, the AD534 provides differential operation on both
numerator and denominator, allowing the ratio of two floating
variables to be generated. Further flexibility results from access
to a high impedance summing input to Y1. As with all dividers
based on the use of a multiplier in a feedback loop, the band-
width is proportional to the denominator magnitude, as shown
in curve 8.
OUTPUT, ±12V PK
=
10V (Z – Z ) +X
2
2
1
+
+V
X
+15V
OUTPUT, ±12V PK
S
1
2
X INPUT
(DENOMINATOR)
+10V FS
+V
X
X
+15V
S
1
REVERSE
10V (Z – Z )
2
1
THIS AND X
INPUTS FOR
NEGATIVE
OUTPUTS
+ Y
=
1
X
(X – X )
+12V PK
1
2
–
R
2
L
OUT
OPTIONAL
SUMMING
INPUT,
OUT
(MUST BE
PROVIDED)
Z
1
SF
Z INPUT
(NUMERATOR)
–
Z
1
Z INPUT
10V FS
12V PK
SF
X, ±10V PK
AD534
AD534
OPTIONAL
SUMMING INPUT
±10V PK
Z
±10V FS, ±12V PK
2
Z
2
+
Y
1
Y
1
–V
–15V
Y
S
2
–15V
–V
Y
S
2
Figure 6. Square-Rooter Connection
Figure 5. Basic Divider Connection
Without additional trimming, the accuracy of the AD534K
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 Optional Trimming Con-
figuration) will improve accuracy for inputs below 1 V.
and L is sufficient to maintain a 1% error over a 10 V to 1 V
denominator range. This range may be extended to 100:1 by
simply reducing the X offset with an externally generated trim
voltage (range required is ±3.5 mV max) applied to the unused
X input (see Optional Trimming Configuration). To trim, apply
a ramp of +100 mV to +V at 100 Hz to both X1 and Z1 (if X2 is
used for offset adjustment, otherwise reverse the signal polarity)
and adjust the trim voltage to minimize the variation in the
output.*
*See the AD535 Data Sheet for more details.
Since the output will be near +10 V, it should be ac-coupled for
this adjustment. The increase in noise level and reduction in
bandwidth preclude operation much beyond a ratio of 100 to 1.
As with the multiplier connection, overall gain can be intro-
duced by inserting a simple attenuator between the output and
Y2 terminal. This option, and the differential-ratio capability of
the AD534 are utilized in the percentage-computer application
shown in Figure 11. This configuration generates an output pro-
portional to the percentage deviation of one variable (A) with re-
spect to a reference variable (B), with a scale of one volt per
percent.
REV. A
–7–
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