LT1996 Linear Technology, LT1996 Datasheet - Page 14

• Manufacturer Part Number: LT1996
• Description: 100uA Gain Selectable Amplifier
• Manufacturer: Linear Technology

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LT1996
APPLICATIO S I FOR ATIO
Inverting Configuration
The inverting amplifier, shown in Figure 8, is another
classical op amp configuration. The circuit is actually
identical to the noninverting amplifier of Figure 4, except
that V
gains is shown in Table 3, and some of the circuits are
shown in Figure 9. Noise gain is 1+|Gain|, as is the usual
case for inverting amplifiers. Again, for the best DC perfor-
mance, match the source impedance seen by the op amp
inputs.
14
Figure 8. The LT1996 as a Classical Inverting Op Amp. Note the
Circuit Is Identical to the Noninverting Amplifier, Except that V
and Ground Have Been Swapped
(DRIVE)
4
V
IN
IN
and GND have been swapped. The list of available
CLASSICAL INVERTING OP AMP CONFIGURATION IMPLEMENTED
WITH LT1991. R
GAIN IS ACHIEVED BY GROUNDING, FLOATING OR FEEDING BACK
THE AVAILABLE RESISTORS TO ARRIVE AT DESIRED R
WE PROVIDE YOU WITH <0.1% RESISTORS.
V
IN
10
8
9
1
2
3
CLASSICAL INVERTING OP AMP CONFIGURATION.
YOU PROVIDE THE RESISTORS.
450k/81
450k/27
450k/27
450k/81
450k/9
450k/9
R
G
U
F
= 45k, R
–
+
U
G
= 5.55k, GAIN = –8.1.
450k
R
–
+
F
V
GAIN = – R
450k
4pF
4pF
4pF
4pF
OUT
W
= GAIN • V
5
LT1996
F
/R
V
G
OUT
IN
F
6
AND R
U
1996 F08
G
V
.
OUT
IN
Table 3. Configuring the M Pins for Simple Inverting Gains
–0.083
–0.110
–0.297
–0.321
–0.329
–0.439
–2.19
–2.89
–3.21
–10.8
–108
–117
Gain
–2.7
–8.1
–27
–36
–81
–90
–9
Output
Output
Output
Output
Output
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
M81
Float
Float
Float
Float
Float
M81, M27, M9 Connection
Output
Output
Output
Output
Output
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Float
Float
Float
Float
Float
M27
Output
Output
Output
Output
Output
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Float
Float
Float
Float
Float
M9
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