MPY634AM BURR-BROWN [Burr-Brown Corporation], MPY634AM Datasheet - Page 5

• Manufacturer Part Number: MPY634AM
• Description: Wide Bandwidth PRECISION ANALOG MULTIPLIER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

TYPICAL PERFORMANCE CURVES
T
THEORY OF OPERATION
The transfer function for the MPY634 is:
where:
An intuitive understanding of transfer function can be gained
by analogy to the op amp. By assuming that the open-loop
gain, A, of the output operational amplifier is infinite,
A
= +25 C, V
A = open-loop gain of the output amplifier (typically
SF = Scale Factor. Laser-trimmed to 10V but adjustable
X, Y, Z are input voltages. Full-scale input voltage
is equal to the selected SF. (Max input voltage =
1.25 SF).
V
14
12
10
8
6
4
OUT
85dB at DC).
over a 3V to 10V range using external resistors.
8
S
= 15VDC, unless otherwise noted.
= A
Output, R
10
(X
INPUT/OUTPUT SIGNAL RANGE
Positive or Negative Supply (V)
1
L
– X
vs SUPPLY VOLTAGES
2k
12
2
SF
) (Y
All inputs, SF = 10V
1
14
– Y
2
800
700
600
500
400
300
200
100
)
0
16
–60
– (Z
–40
1
– Z
18
–20
BIAS CURRENTS vs TEMPERATURE
2
)
Scaling Voltage = 3V
0
20
Temperature (°C)
(X,Y or Z Inputs)
20
Scaling Voltage = 10V
5
40
inspection of the transfer function reveals that any V
be created with an infinitesimally small quantity within the
brackets. Then, an application circuit can be analyzed by
assigning circuit voltages for all X, Y and Z inputs and
setting the bracketed quantity equal to zero. For example,
the basic multiplier connection in Figure 1, Z
Z
This approach leads to a simple relationship which can be
solved for V
The scale factor is accurately factory adjusted to 10V and is
typically accurate to within 0.1% or less. The scale factor
may be adjusted by connecting a resistor or potentiometer
between pin SF and the –V
external resistor can be approximated by:
2
(CONT)
60
= 0. The quantity within the brackets then reduces to:
80
–12
(X
100
Functional
Derated Accuracy
OUT
1
–10
– X
120
to provide the closed-loop transfer function.
INPUT DIFFERENTIAL-MODE/
2
COMMON-MODE VOLTAGE
) (Y
140
SF
–5
1
– Y
–10
S
10
–5
power supply. The value of the
5
2
)
V
MPY634
– (V
CM
V
Specified
Accuracy
S
= ±15V
OUT
5
– 0) = 0
10
1
= V
12
V
DIFF
OUT
OUT
and
can
®