AD632(RevA) 데이터 시트보기 (PDF) - Analog Devices
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AD632 Datasheet PDF : 6 Pages
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AD632
Typical Performance Curves
(typical @ +25؇C with ؎VS = 15 V)
Figure 1. AC Feedthrough vs. Frequency
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 2. Frequency Response as a Multiplier
Figure 3. Frequency Response vs. Divider Denominator
Input Voltage
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.
The Z2 terminal of the AD632 may be used to sum an addi-
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
VOUT = XY, so that the circuit can exhibit a maximum gain of
10. This connection results in a reduction of bandwidth to
about 80 kHz without the peaking capacitor CF. In addition, the
output offset voltage is increased by a factor of 10 making exter-
nal adjustments necessary in some applications.
–4–
REV. A
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