參數(shù)資料
型號(hào): OP90GSZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 3/13頁(yè)
文件大?。?/td> 0K
描述: IC OPAMP GP PREC 8SOIC
標(biāo)準(zhǔn)包裝: 98
放大器類型: 通用
電路數(shù): 1
轉(zhuǎn)換速率: 0.012 V/µs
電流 - 輸入偏壓: 4nA
電壓 - 輸入偏移: 125µV
電流 - 電源: 14µA
電流 - 輸出 / 通道: 5mA
電壓 - 電源,單路/雙路(±): 1.6 V ~ 36 V,±0.8 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 管件
產(chǎn)品目錄頁(yè)面: 773 (CN2011-ZH PDF)
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
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
ITEST
VOUT = 100mV/mA (ITEST)
TO CIRCUIT
UNDER TEST
+
OP90
Figure 12. Single-Supply Current Monitor
REV. C
+
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