AD633AN Analog Devices Inc, AD633AN Datasheet - Page 7

• Manufacturer Part Number: AD633AN
• Description: IC MULTIPLIER ANALOG 8-DIP
• Manufacturer: Analog Devices Inc

Specifications of AD633AN

• Rohs Status: RoHS non-compliant
• Function: Analog Multiplier
• Number Of Bits/stages: 4-Quadrant
• Package / Case: 8-DIP (0.300", 7.62mm)
• Number Of Elements: 1
• Output Type: Single
• Power Supply Requirement: Dual
• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (typ): ±15V
• Dual Supply Voltage (min): ±8V
• Dual Supply Voltage (max): ±18V
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 8
• Package Type: PDIP
• Lead Free Status / RoHS Status: Not Compliant

APPLICATIONS INFORMATION
The AD633 is well suited for such applications as modulation
and demodulation, automatic gain control, power measurement,
voltage-controlled amplifiers, and frequency doublers. These
applications show the pin connections for the AD633JN (8-lead
PDIP), which differs from the AD633JR (8-lead SOIC).
MULTIPLIER CONNECTIONS
Figure 11 shows the basic connections for multiplication. The X
and Y inputs normally have their negative nodes grounded, but
they are fully differential, and in many applications, the grounded
inputs may be reversed (to facilitate interfacing with signals of a
particular polarity while achieving some desired output polarity),
or both may be driven.
SQUARING AND FREQUENCY DOUBLING
As is shown in Figure 12, squaring of an input signal, E, is
achieved simply by connecting the X and Y inputs in parallel to
produce an output of E
but the output is positive. However, the output polarity can be
reversed by interchanging the X or Y inputs. The Z input can be
used to add a further signal to the output.
When the input is a sine wave E sin ωt, this squarer behaves as a
frequency doubler, because
Equation 2 shows a dc term at the output that varies strongly
with the amplitude of the input, E. This can be avoided using
the connections shown in Figure 13, where an RC network is
used to generate two signals whose product has no dc term. It
uses the identity
INPUT
INPUT
X
Y
cos
(
E
sin
10
+
–
+
–
θ
E
sin
V
ω
t
1
2
3
4
θ
)
2
Figure 11. Basic Multiplier Connections
=
X1
X2
Y1
Y2
AD633JN
Figure 12. Connections for Squaring
=
1
2
20
1
2
3
4
(
E
sin
2
X1
X2
Y1
Y2
2
V
/10 V. The input can have either polarity,
AD633JN
+V
–V
2
W
(
1
S
Z
S
θ
−
)
8
7
6
5
+15V
cos
+V
–15V
–V
W
Z
S
S
0.1µF
2
0.1µF
8
7
6
5
ω
–15V
OPTIONAL SUMMING
INPUT, Z
+15V
t
)
0.1µF
0.1µF
W =
(X1 – X2)(Y1 – Y2)
W =
10V
10V
E
2
+ Z
Rev. G | Page 7 of 12
(2)
(3)
At ω
attenuated by √2), and the Y input lags the X input by 45° (and
is also attenuated by √2). Becausee the X and Y inputs are 90° out
of phase, the response of the circuit is (satisfying Equation 3)
which has no dc component. Resistors R1 and R2 are included
to restore the output amplitude to 10 V for an input amplitude
of 10 V.
The amplitude of the output is only a weak function of frequency;
the output amplitude is 0.5% too low at ω = 0.9 ω
GENERATING INVERSE FUNCTIONS
Inverse functions of multiplication, such as division and square
rooting, can be implemented by placing a multiplier in the feedback
loop of an op amp. Figure 14 shows how to implement square
rooting with the transfer function for the condition E < 0.
E < 0V
o
W
W
= 1/CR, the X input leads the input signal by 45° (and is
=
=
=
10kΩ
E
(
40
(
10
E
−
C
R
1
2
V
(
V
10
Figure 14. Connections for Square Rooting
Figure 13. Bounceless Frequency Doubler
)
2
3
)
(
E
sin
AD711
E
)
V
2
+15V
–15V
2
1
2
3
4
(
7
4
sin
ω
X1
X2
Y1
Y2
AD633JN
0
t
ω
0.1µF
)
0.1µF
0
t
6
+
+V
–V
45
W
Z
S
S
10kΩ
°
8
7
6
5
) (
1
2
3
4
0.1µF
+15V
E
X1
X2
Y1
Y2
AD633JN
2
0.1µF
sin
–15V
1kΩ
R1
ω
+V
–V
0
W
R2
3kΩ
0
Z
S
S
t
W =
and ω
+
W =
8
7
6
5
+15V
45
1N4148
10V
E
10V)E
°
0.1µF
0
2
AD633
)
= 1.1 ω
–15V
0.1µF
(4)
0
(5)
.