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參數(shù)資料
| 型號： | OP90 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Low-Voltage Micropower Operational Amplifier |
| 中文描述： | 精密低電壓微功率運算放大器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 653K |
| 代理商： | OP90 |
REV. A
OP90
–11–
Single-Supply Current Monitor
Current monitoring essentially consists of amplifying the voltage
drop across a resistor placed in a series with the current to be
measured. The difficulty is that only small voltage drops can be
tolerated and with low precision op amps this greatly limits the
overall resolution. The single supply current monitor of Figure 12
has a resolution of 10
μ
A and is capable of monitoring 30 mA of
current. This range can be adjusted by changing the current
sense resistor R1. When measuring total system current, it may
be necessary to include the supply current of the current moni-
tor, which bypasses the current sense resistor, in the final result.
This current can be measured and calibrated (together with the
residual offset) by adjustment of the offset trim potentiometer,
R2. This produces a deliberate offset that is temperature
dependent. However, the supply current of the OP90 is also
proportional to temperature and the two effects tend to track.
Current in R4 and R5, which also bypasses R1, can be accounted
for by a gain trim.
R1
1
R4
9.9k
R2
100k
R3
100k
3
7
6
4
2
5
1
V+
R5
100
I
TEST
V
OUT
= 100mV/mA (I
TEST
)
TO CIRCUIT
UNDER TEST
–
+
OP90EZ
Figure 12. Single-Supply Current Monitor
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-90 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION, LOW VOLTAGE MICROPOWER OPERATIONAL AMPLIFIER |
| OP900SL | 功能描述:光電二極管 PN PHOTODIODE RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP905 | 功能描述:光電二極管 Photodiode RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP906 | 功能描述:光電二極管 Photodiode RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP90ARC/883 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION, LOW VOLTAGE MICROPOWER OPERATIONAL AMPLIFIER |
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