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MPY600 Datasheet(PDF) 6 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part No. MPY600
Description  Wide Bandwidth SIGNAL MULTIPLIER
Download  12 Pages
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Maker  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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MPY600 Datasheet(HTML) 6 Page - Burr-Brown (TI)

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®
MPY600
6
APPLICATION INFORMATION
POWER SUPPLIES
The MPY600 may be operated from power supplies from
±4.75V to ±8V. Operation from ±5V supplies is recom-
mended. Since input and output levels are
±2V, larger
supply voltage is not required for full output voltage swing.
Furthermore, power dissipation can be minimized by using
lower power supply voltage. Power supplies should be
bypassed with good high-frequency capacitors such as ce-
ramic or solid tantalum.
TRANSFER FUNCTION
The open-loop transfer function of the MPY600 is:
where A = open-loop gain of the output amplifier (typically
70dB).
X, Y, Z are differential input voltages—
±2V max.
An intuitive understanding of the transfer function can be
gained by analogy to an op amp. Assuming that the open-
loop gain is infinite, any output voltage can be created by an
infinitesimally small quantity with the brackets. An applica-
tions circuit can be analyzed by assigning circuit voltages to
the X, Y and Z inputs and setting the bracketed quantity
equal to zero.
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, VS = ±5V unless otherwise noted.
For example, in the basic multiplier connection (Figure 1),
Z1 = VO and Z2 = 0. Setting this equal to zero:
Solving for VO yields the transfer function of the circuit.
The X input is specified for
±1V full-scale differential input.
X inputs up to
±2V provide useful operation with somewhat
reduced accuracy and distortion performance. The Y input is
rated for
±2V full-scale input. The Y input gain (and there-
fore its full-scale range) can be varied with an external
resistor connected to the RY terminals—see “Modulator/
Demodulator.” Full-scale inputs (X =
±1V, Y = ±2V) pro-
duce a
±1V output.
The differential inputs, X1, X2, and Y1, Y2, make it easy to
trim offset voltage. The trim voltage is applied to the X2 or
Y2 input, which is otherwise grounded (see X2 input, Figure
5). Polarity of the input signals can be reversed by inter-
changing the inputs (reversing the connections X1 and X2,
for instance). The unused current outputs (pins 15 and 16)
must be grounded (or loaded—see discussion on current
outputs).
The output amplifier is operated in unity gain. The output
voltage can be increased (for small input signals) by placing
the internal output op amp in higher gain (Figure 2). This
reduces bandwidth and increases output offset voltage
errors.
V
O = A
X
1 –X2
()•Y
1 –Y2
()
2V
–Z
1 –Z 2
()
X
1 –X2
()•Y
1 –Y2
()
2V
–V
O
 = 0
VOLTAGE OUTPUT SQUARER FREQUENCY RESPONSE
10k
100k
1M
10M
100M
Frequency (Hz)
5
0
–5
–10
–15
–20


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