AD632

–4–

REV. A

Typical Performance Curves

(typical @ +25 C with

Figure 1. AC Feedthrough vs. Frequency

Figure 2. Frequency Response as a Multiplier

Figure 3. Frequency Response vs. Divider Denominator

Input Voltage

Figure 4. AD632 Functional Block Diagram

OPERATION AS A MULTIPLIER

Figure 5 shows the basic connection for multiplication. Note

that the circuit will meet all specifications without trimming.

Figure 5. Basic Multiplier Connection

In some cases the user may wish to reduce ac feedthrough to a

minimum (as in a suppressed carrier modulator) by applying an

external trim voltage (

±30 mV range required) to the X or Y

input. Curve 1 shows the typical ac feedthrough with this ad-

justment mode. Note that the feedthrough of the Y input is a

factor of 10 lower than that of the X input and should be used

in applications where null suppression is critical.

tional signal into the output. In this mode the output amplifier

behaves as a voltage follower with a 1 MHz small signal band-

width and a 20 V/

µs slew rate. This terminal should always be

referenced to the ground point of the driven system, particularly

if this is remote. Likewise the differential inputs should be refer-

enced to their respective signal common potentials to realize the

full accuracy of the AD632.

A much lower scaling voltage can be achieved without any re-

duction of input signal range using a feedback attenuator as

shown in Figure 6. In this example, the scale is such that

10. This connection results in a reduction of bandwidth to

output offset voltage is increased by a factor of 10 making exter-

nal adjustments necessary in some applications.