AD532
APPLICATIONS CONSIDERATIONS
SQUARE
The performance and ease of use of the AD532 is achieved
through the laser trimming of thin-film resistors deposited
directly on the monolithic chip. This trimming-on-the-chip
technique provides a number of significant advantages in terms
of cost, reliability and flexibility over conventional in-package
trimming of off-the-chip resistors mounted or deposited on a
hybrid substrate.
X
Z
1
2
X
V
AD532
V
OUT
OUT
Y
Y
1
2
V
IN
10V
+V
+V
–V
S
2
S
OS
V
=
OUT
(OPTIONAL)
V
IN
20kꢂ
First and foremost, trimming on the chip eliminates the need for
a hybrid substrate and the additional bonding wires that are
required between the resistors and the multiplier chip. By trim-
ming more appropriate resistors on the AD532 chip itself, the
second input terminals that were once committed to external
trimming networks have been freed to allow fully differential
operation at both the X and Y inputs. Further, the requirement
for an input attenuator to adjust the gain at the Y input has been
eliminated, letting the user take full advantage of the high input
impedance properties of the input differential amplifiers. Thus, the
AD532 offers greater flexibility for both algebraic computation and
transducer instrumentation applications.
–V
S
S
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 response
to the input . . . a useful feature for control applications, as it
might eliminate the need for an additional inverter somewhere else.
DIVISION
Z
X
10VZ
X
V
=
OUT
Z
X
1
2
X
V
AD532
OUT
OUT
Finally, provision for fine trimming the output voltage offset has
been included. This connection is optional, however, as the
AD532 has been factory-trimmed for total performance as
described in the listed specifications.
Y
Y
1
+V
–V
S
2
S
1kꢂ
(SF)
47kꢂ
2.2kꢂ
10kꢂ
20kꢂ
(X )
REPLACING OTHER IC MULTIPLIERS
0
+V
–V
S
S
Existing designs using IC multipliers that require external
trimming networks can be simplified using the pin-for-pin
replaceability of the AD532 by merely grounding the X2, Y2 and
VOS terminals. (The VOS terminal should always be grounded
when unused.)
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.
APPLICATIONS
MULTIPLICATION
Z
X
X
1
2
V
AD532
OUT
OUT
Y
1
2
V
Y
OS
(X – X ) (Y – Y )
1
2
10V
1
2
V
=
OUT
(OPTIONAL)
20kꢂ
+V
–V
S
S
Figure 11. Multiplier Connection
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.
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
polarity 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.
Table I. Adjust Procedure (Divider or Square Rooter)
DIVIDER
SQUARE ROOTER
Adjust
Adjust
for:
With:
With:
for:
Adjust
X
Z
VOUT
Z
VOUT
–10 V
–1 V
Scale Factor –10 V +10 V –10 V
X0 (Offset)
+10 V
+0.1 V
–1 V
+0.1 V –1 V
Repeat if required.
REV. C
–6–
5秒后页面跳转
NTC热敏电阻与PTC热敏电阻的应用原理及应用范围
GTO与普通晶闸管相比为什么可以自关断？为什么普通晶闸管不能呢？从GTO原理、应用范围带你了解原因及推荐型号
LF353数据手册解读：特性、应用、封装、引脚说明、电气参数及替换型号推荐
A4950资料手册解读：特性、应用、封装、引脚功能、电气参数及代换型号
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
技术参数
数据手册
如果您发现信息不准确，
