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LBPC Datasheet(PDF) 16 Page - Linear Technology

Part # LBPC
Description  Precision, 100uA Gain Selectable Amplifier
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LBPC Datasheet(HTML) 16 Page - Linear Technology

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LT1996
16
1996f
Figure 10. Difference Amplifier Using the LT1996. Gain Is Set
Simply by Connecting the Correct Resistors or Combinations of
Resistors. Gain of 27 Is Shown, with Dashed Lines Modifying It
to Gain of 2.7. Noise Gain Is Optimal
Difference Amplifiers
The resistors in the LT1996 allow it to easily make differ-
ence amplifiers also. Figure 10 shows the basic 4-resistor
difference amplifier and the LT1996. A difference gain of
27 is shown, but notice the effect of the additional dashed
connections. By connecting the 50k resistors in parallel,
the gain is reduced by a factor of 10. Of course, with so
many resistors, there are many possible gains. Table 4
shows the difference gains and how they are achieved.
Note that, as for inverting amplifiers, the noise gain is 1
more than the signal gain.
Table 4. Connections Giving Difference Gains for the LT1996
Gain
VIN+
VIN–
Output
GND (REF)
0.083
P9
M9
M27, M81
P27, P81
0.110
P9
M9
M81
P81
0.297
P27
M27
M9, M81
P9, P81
0.321
P9
M9
M27
P27
0.329
P27
M27
M81
P81
0.439
P9, P27
M9, M27
M81
P81
2.189
P81
M81
M9, M27
P9, P27
2.700
P27
M27
M9
P9
2.893
P81
M81
M27
P27
3.214
P9, P81
M9, M81
M27
P27
8.1
P81
M81
M9
P9
9
P9
M9
10.8
P27, P81
M27, M81
M9
P9
27
P27
M27
36
P9, P27
M9, M27
81
P81
M81
90
P9, P81
M9, M81
108
P27, P81
M27, M81
117
P9, P27, P81 M9, M27, M81
APPLICATIO S I FOR ATIO
4pF
4pF
–
+
RF
RG
RG
VIN
+
VIN
+
VIN
–
VIN
–
VOUT
VOUT
VOUT = GAIN • (VIN
+ – VIN–)
GAIN = RF/RG
–
+
1996 F10
450k
450k
8
6
5
9
10
1
2
3
LT1996
CLASSICAL DIFFERENCE AMPLIFIER USING THE LT1991
CLASSICAL DIFFERENCE AMPLIFIER IMPLEMENTED
WITH LT1991. RF = 450k, RG = 16.7k, GAIN = 3.
ADDING THE DASHED CONNECTIONS CONNECTS THE
TWO 450k RESISTOR IN PARALLEL, SO RF IS REDUCED
TO 45k. GAIN BECOMES 45k/16.7k = 2.7.
RF
PARALLEL
TO CHANGE
RF, RG
450k/81
450k/27
450k/9
450k/81
450k/27
450k/9
4pF
4pF



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