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OP90GSZ Datasheet(PDF) 11 Page - Analog Devices |
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OP90GSZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 13 page 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 µA 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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