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參數(shù)資料
| 型號(hào)： | LBMM |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Precision, 100UA Gain Selectable Amplifier |
| 中文描述： | 精密，100uA的可選增益放大器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 311K |
| 代理商： | LBMM |
LT1991
14
1991fb
Table 3. Configuring the M Pins for Simple Inverting Gains
M9, M3, M1 Connection
Gain
M9
–0.077
Output
–0.1
Output
–0.25
Float
–0.273
Output
–0.3
Output
–0.4
Output
–1
Float
–1.5
Float
–1.8
Drive
–2.25
Drive
–2.5
Drive
–3
Float
–4
Float
–4.5
Drive
–6
Drive
–9
Drive
–10
Drive
–12
Drive
–13
Drive
M3
M1
Drive
Drive
Drive
Output
Float
Drive
Drive
Output
Output
Float
Drive
Float
Drive
Output
Output
Float
Drive
Float
Drive
Output
Float
Output
Drive
Drive
Drive
Float
Drive
Output
Output
Output
Drive
Drive
Float
Drive
Float
Float
Drive
Drive
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
IN
and GND have been swapped. The list of available
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.
Figure 8. The LT1991 as a Classical Inverting Op Amp.
Note the Circuit Is Identical to the Noninverting Amplifier,
Except that V
IN
and Ground Have Been Swapped
APPLICATIOU
W
U
U
–
+
R
F
R
G
V
IN
V
IN
(DRIVE)
V
OUT
V
OUT
V
= GAIN V
IN
GAIN = – R
F
/R
G
–
+
1991 F08
50k
150k
450k
50k
150k
450k
450k
450k
8
6
5
9
10
1
2
3
LT1991
CLASSICAL INVERTING OP AMP CONFIGURATION.
YOU PROVIDE THE RESISTORS.
CLASSICAL INVERTING OP AMP CONFIGURATION IMPLEMENTED
WITH LT1991. R
F
= 225k, R
G
= 50k, GAIN = –4.5.
GAIN IS ACHIEVED BY GROUNDING, FLOATING OR FEEDING BACK
THE AVAILABLE RESISTORS TO ARRIVE AT DESIRED R
F
AND R
G
.
WE PROVIDE YOU WITH <0.1% RESISTORS.
4pF
4pF
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