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參數(shù)資料
| 型號(hào)： | 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(yùn)放) |
| 中文描述： | 雙低偏置電流高精度運(yùn)算放大器（低偏置電流精密雙運(yùn)放） |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 193K |
| 代理商： | OP297 |
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8/21/97 4:00 PM
OP297
–11–
REV. D
In these circuits, I
REF
is a function of the negative power supply.
To maintain accuracy, the negative supply should be well regu-
lated. For applications where very high accuracy is required, a
voltage reference may be used to set I
REF
. An important consid-
eration for the squaring circuit is that a sufficiently large input
voltage can force the output beyond the operating range of the
output op amp. Resistor R4 can be changed to scale I
REF
, or R1,
and R2 can be varied to keep the output voltage within the
usable range.
Unadjusted accuracy of the square-root circuit is better than
0.1% over an input voltage range of 100 mV to 10 V. For a
similar input voltage range, the accuracy of the squaring circuit
is better than 0.5%.
Figure 35. Square-Root Amplifier
V
IN
33k
1/2
OP-297
+
2
3
8
1
4
V–
V+
C
1
100pF
C
2
100pF
R
2
33k
R
1
I
O
I
IN
I
REF
V
OUT
1/2
OP-297
+
6
5
7
MAT-04E
Q
1
1
3
2
Q
4
12
14
13
Q
2
7
5
6
Q
3
10
8
9
2k
R
5
50k
R
3
50k
R
4
–15V
–
–
OP297 SPICE MACRO-MODEL
Figures 36 and 37 show the node end net list for a SPICE
macro model of the OP297. The model is a simplified version of
the actual device and simulates important dc parameters such as
V
OS
, I
OS
, I
B
, A
VO
, CMR, V
O
and I
SY
. AC parameters such as
slew rate, gain and phase response and CMR change with fre-
quency are also simulated by the model.
The model uses typical parameters for the OP297. The poles
and zeros in the model were determined from the actual open
and closed-loop gain and phase response of the OP297. In this
way, the model presents an accurate ac representation of the
actual device. The model assumes an ambient temperature
of 25
°
C.
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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(zhǎng):880 nm 射束角:+/- 25 輻射強(qiáng)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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