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MC1495BP Fiches technique(PDF) 8 Page - ON Semiconductor

No de pièce MC1495BP
Description  LINEAR FOUR-QUADRANT MULTIPLIER
Download  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC1495BP Fiches technique(HTML) 8 Page - ON Semiconductor

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8
Maximum Output Voltage Swing
The maximum output voltage swing is dependent upon
the factors mentioned below and upon the particular circuit
being considered.
For Figure 20 the maximum output swing is dependent
upon V+ for positive swing and upon the voltage at Pin 1 for
negative swing. The potential at Pin 1 determines the
quiescent level for transistors Q5, Q6, Q7 and Q8. This
potential should be related so that negative swing at Pins 2
or 14 does not saturate those transistors. See General Design
Procedure for further information regarding selection of
these potentials.
RX RY I3
56
10
RX
RY
11
RI
RL
RL
2
1
14
VO
9
12
4
8
3
I3
13
7
R13
R3
V-
V+
VX
VY
VO = K VX VY
K =
2RL
MC1495
+
+
+
-
-
-
Figure 20. Basic Multiplier
If an operational amplifier is used for level shift, as shown
in Figure 21, the output swing (of the multiplier) is greatly
reduced. See Section 3 for further details.
GENERAL DESIGN PROCEDURE
Selection of component values is best demonstrated by the
following example. Assume resistive dividers are used at the
X and Y-inputs to limit the maximum multiplier input to
±
5.0 V [VX = VY(max)] for a ± 10 V input [VX′ = VY′(max)]
(see Figure 21). If an overall scale factor of 1/10 is desired,
VO =
VX′ VY′
10
=
(2VX) (2VY)
10
= 4/10 VX VY
then,
Therefore, K = 4/10 for the multiplier (excluding the divider
network).
Step 1. The fist step is to select current I3 and current I13.
There are no restrictions on the selection of either of these
currents except the power dissipation of the device. I3 and
I13 will normally be 1.0 mA or 2.0 mA. Further, I3 does not
have to be equal to I13, and there is normally no need to make
them different. For this example, let
I3 = I13 = 1.0 mA.
5
RX
10 k
RY
10 k
11
10
RL
18 k
5.0 k
P4
Output
Offset
Adjust
10 k
R13
12 k
I3
4
9
13
8
12
14
2
+
-
+
+
10 k
VY′
VY
VX
MC1495
MC1741C
P1
P2
10 k
2.0 k
-15 V
+15 V
5.1 V
2
3
7
4
6
5
1
+
-
20 k
RL
0.1 µF
+15 V
R0
3.0 k
R0
3.0 k
R1
3.0 k
1
7
- 15 V
- 15 V
3
I13
10 k
10 k
10 k
6
0.1 µF
2.0 k
Y Offset
Adjust
Scale
Factor
Adjust
R3
-10V ≤ VX ≤ +10V
-10V ≤ VY ≤ +10V
12 k
5.0 k
P3
X Offset
Adjust
VO =
-VX VY
10
VX′
Figure 21. Multiplier with Operational Amplifier Level Shift
5.1 V


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