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参数资料
| 型号： | AN-242 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | LJT 18C 18#20 SKT RECP |
| 中文描述： | 应用新的精密运算放大器 |
| 文件页数： | 11/16页 |
| 文件大小： | 267K |
| 代理商： | AN-242 |
3
V1
e
0
@
I
IN
e
100 nA
V1
e b
0.24V
@
I
IN
e
10 pA
M1
e
0
@
I
IN
e
10 pA
**
M1
e
f.s.
@
I
IN
e
1 mA
2
*
TL/H/7479–20
Figure 18. Light meter has eight-decade range. Bias current compensation can give input current resolution of better
than
g
2 pA over 15
§
C to 55
§
C.
Figure 19 shows the classic op amp differential amplifier
connection. It is not widely used because the input resist-
ance is much lower than alternate methods. But when the
input common-mode voltage exceeds the supply voltage for
the op amp, this cannot be avoided. At least with the LM11,
large feedback resistors can be used to reduce loading
without affecting DC accuracy. The impedances looking into
the two inputs are not always the same. The values given
equalize them for common-mode signals because they are
usually larger. With single-ended inputs, the input resistance
on the inverting input is R1, while that on the non-inverting
input is the sum of R2, R4 and R5.
Provision is made to trim the circuit for maximum DC and AC
common-mode rejection. This is advised because well
matched high-value resistors are hard to come by and be-
cause unbalanced stray capacitances can cause severe de-
terioration of AC rejection with such large values. Particular
attention should be paid to resistor tracking over tempera-
ture as this is more of a problem with high-value resistors. If
higher gain or gain trim is required, R6 and R7 can be add-
ed.
V
S
e
g
15V
V
CM(MAX)
e
R1
OUT(MAX)
A
V
e
R3
R1
#
R6
a
R7
R6
J
2
trim for DC CMRR
3
trim for AC CMRR
TL/H/7479–21
Figure 19. This differential amplifier handles high input
voltages. Resistor mismatches and stray ca-
pacitances should be balanced out for best
common-mode rejection.
11
相关PDF资料 |
PDF描述 |
|---|---|
| AN-40 | Application Note 40 |
| AN-5002 | LJT 18C 18#20 SKT WALL RECP |
| AN-5025 | Applications Using the GTLP10B320 |
| AN-5026 | Circular Connector; No. of Contacts:19; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:15-19 RoHS Compliant: No |
| AN-5031 | GTLP Power Configuration |
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