AD532

Rev. D | Page 12 of 16

APPLICATIONS

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.

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 trimming

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. Therefore, the

AD532 offers greater flexibility for both algebraic computation

and transducer instrumentation applications.

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.

REPLACING OTHER IC MULTIPLIERS

Existing designs using IC multipliers that require external

trimming networks can be simplified using the pin-for-pin

when unused.

Multiplication

Z

OUT

AD532

20kΩ

10V

(OPTIONAL)

Figure 15. Multiplier Connection

For operation as a multiplier, the AD532 should be connected

as shown in Figure 15. 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

are zero volts to obtain zero out, or to buck out other system

offsets.

Squaring

AD532

20kΩ

10V

(OPTIONAL)

Z

OUT

Figure 16. Squarer Connection

The squaring circuit in Figure 16 is a simple variation of the

multiplier. The differential input capability of the AD532,

however, 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

AD532

20kΩ

47kΩ

2.2kΩ

10kΩ

1kΩ

(SF)

10VZ

X

Z

OUT

Z

X

Figure 17. 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 17. It should be noted, however, that the output error is

error specification for the multiply mode; and bandwidth by

Further, to avoid positive feedback, the X input is restricted to

negative values. Thus, for single-ended negative inputs (0 V to

single-ended positive inputs (0 V to +10 V), connect the input

and explained in Table 6.

For practical reasons, the useful range in denominator input is

full scale.