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參數(shù)資料
| 型號： | op297 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Low Bias Current Precision Operational Amplifier(低偏置電流精密雙運放) |
| 中文描述： | 雙低偏置電流高精度運算放大器（低偏置電流精密雙運放） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 193K |
| 代理商： | OP297 |
8/21/97 4:00 PM
OP297
–8–
REV. D
a humidity barrier. Even a clean PC board can have 100 pA of
leakage currents between adjacent traces, so guard rings should
be used around the inputs. Guard traces are operated at a volt-
age close to that on the inputs, as shown in Figure 28, so that
leakage currents become minimal. In noninverting applications,
the guard ring should be connected to the common-mode volt-
age at the inverting input. In inverting applications, both inputs
remain at ground, so the guard trace should be grounded. Guard
OPEN-LOOP GAIN LINEARITY
The OP297 has both an extremely high gain of 2000 V/mV
minimum and constant gain linearity. This enhances the preci-
sion of the OP297 and provides for very high accuracy in high
closed loop gain applications. Figure 29 illustrates the typical
open-loop gain linearity of the OP297 over the military tempera-
ture range.
T
A
= +125
°
C
T
A
= –55
°
C
T
A
= +25
°
C
R
L
= 10k
V
S
=
±
15V
V
CM
= 0V
OUTPUT VOLTAGE (VOLTS)
D
μ
V
–15
–10
–5
0
5
10
15
Figure 29. Open-Loop Linearity of the OP297
APPLICATIONS
PRECISION ABSOLUTE VALUE AMPLIFIER
The circuit of Figure 30 is a precision absolute value amplifier
with an input impedance of 30 M
. The high gain and low
TCV
OS
of the OP297 insure accurate operation with microvolt
input signals. In this circuit, the input always appears as a
common-mode signal to the op amps. The CMR of the OP297
exceeds 120 dB, yielding an error of less than 2 ppm.
+
–
1/2
OP-297
0V < V
OUT
< 10V
7
6
5
R
3
1k
R
2
2k
R
1
1k
D
1N4148
D
2
1N4148
+
–
1/2
C
30pF
–15V
C
3
0.1
μ
F
4
1
8
2
3
V
IN
C
2
0.1
μ
F
+15V
Figure 30. Precision Absolute Value Amplifier
PRECISION CURRENT PUMP
Maximum output current of the precision current pump shown
in Figure 31 is
±
10 mA. Voltage compliance is
±
10 V with
±
15 V supplies. Output impedance of the current transmitter
exceeds 3 M
with linearity better than 16 bits.
–
1/2
OP-297
+
UNITY-GAIN FOLLOWER
INVERTING AMPLIFIER
NONINVERTING AMPLIFIER
1/2
OP-297
+
–
MINI-DIP
BOTTOM VIEW
1/2
OP-297
+
–
1
8
B
A
Figure 28. Guard Ring Layout and Connections
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-297 | 制造商:AD 制造商全稱:Analog Devices 功能描述:DUAL LOW BIAS CURRENT PRECISION OPERATIONAL AMPLIFIER |
| OP297_03 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Low Bias Current Precision Operational Amplifier |
| OP297_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Low Bias Current Precision Operational Amplifier |
| OP2970012Z | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP297A | 功能描述:紅外發(fā)射源 Infrared 890nm RoHS:否 制造商:Fairchild Semiconductor 波長:880 nm 射束角:+/- 25 輻射強度: 最大工作溫度:+ 100 C 最小工作溫度:- 40 C 封裝 / 箱體:Side Looker 封裝:Bulk |
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