AD633JR Analog Devices Inc, AD633JR Datasheet - Page 10

• Manufacturer Part Number: AD633JR
• Description: IC ANALOG MULTIPLIER 8-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD633JR

• Rohs Status: RoHS non-compliant
• Function: Analog Multiplier
• Number Of Bits/stages: 4-Quadrant
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Frequency Max: 1MHz
• Ic Function: Analog Multiplier IC
• Accuracy: 2 %
• Accuracy %: 2%
• Output Voltage: 11V
• Supply Voltage Max: 18V
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD633
For example, if R = 8 kΩ and C = 0.002 µF, then Output A has a
pole at frequencies from 100 Hz to 10 kHz for E
100 mV to 10 V. Output B has an additional 0 at 10 kHz (and
can be loaded because it is the low impedance output of the
multiplier). The circuit can be changed to a high-pass filter Z
interchanging the resistor and capacitor as shown in Figure 20.
VOLTAGE-CONTROLLED QUADRATURE OSCILLATOR
Figure 21 shows two multipliers being used to form integrators
with controllable time constants in second-order differential
equation feedback loop. R2 and R5 provide controlled current
output operation. The currents are integrated in capacitors C1
and C2, and the resulting voltages at high impedance are applied
to the X inputs of the next AD633. The frequency control input,
CONTROL
INPUT E
INPUT E
SIGNAL
C
S
Figure 20. Voltage-Controlled, High-Pass Filter
1
2
3
4
1kΩ
X1
X2
Y1
Y2
R1
AD633JN
E
C
1N914
1N914
D1
+V
–V
D2
W
1N5236
S
Z
S
D5
8
7
6
5
+15V
–15V
1
2
3
4
0.1µF
0.1µF
X1
X2
Y1
Y2
AD633JN
D3
1N914
D4
1N914
0
dB
+V
–V
f
1
OUTPUT A
W
S
Z
S
R
C
f
2
OUTPUT B
OUTPUT A
8
7
6
5
Figure 21. Voltage-Controlled Quadrature Oscillator
C
+6dB/OCTAVE
+15V
–15V
ranging from
OUTPUT B
0.1µF
0.1µF
f
Rev. H | Page 10 of 16
R2
16kΩ
C1
0.1µF
E
calibration of 100 Hz/V. The accuracy is limited by the Y input
offsets. The practical tuning range of this circuit is 100:1. C2
(proportional to C1 and C3), R3, and R4 provide regenerative
feedback to start and maintain oscillation. The diode bridge, D1
through D4 (1N914s), and Zener diode D5 provide economical
temperature stabilization and amplitude stabilization at ±8.5 V
by degenerative damping. The output from the second integrator
(10 V sin ωt) has the lowest distortion.
AUTOMATIC GAIN CONTROL (AGC) AMPLIFIERS
Figure 22 shows an AGC circuit that uses an rms-to-dc
converter to measure the amplitude of the output waveform.
The AD633 and A1, ½ of an AD712 dual op amp, form a
voltage-controlled amplifier. The rms-to-dc converter, an
AD736, measures the rms value of the output signal. Its output
drives A2, an integrator/comparator whose output controls the
gain of the voltage-controlled amplifier. The 1N4148 diode
prevents the output of A2 from going negative. R8, a 50 kΩ
variable resistor, sets the output level of the circuit. Feedback
around the loop forces the voltages at the inverting and
noninverting inputs of A2 to be equal, thus the AGC.
1
2
3
4
C
, connected to the Y inputs, varies the integrator gains with a
X1
X2
Y1
Y2
AD633JN
+V
–V
W
Z
S
S
8
7
6
5
+15V
–15V
0.1µF
0.1µF
R3
330kΩ
f =
R5
16kΩ
C3
0.1µF
10V
E
C2
0.1µF
C
(10V) sin ωt
(10V) cos ωt
= kHz
R4
16kΩ