High_performance_isolation_amplifier

Published:2009/7/24 4:09:00 Author:Jessie | From:SeekIC

Fig. 14-21 This amplifier features inputs, which are galvanically isolated from the output and power connections, as required by many factory and process-control environments. The isolation allows this amplifier to ignore the effects of transducer ground loops, and operate at input common-mode voltages many times the power-supply voltage. The circuit has a 0.03% transfer accuracy, a 50-nV/℃ input drift, a gain of 1000, and will operate at 250-V input common-mode levels. To trim, tie the A1 input to floating common and adjust the zero trim for 0-V output. Next, connect the A1 input to +5-mV, and adjust the gain trim at A2 for +5.000-V output. Finally, connect the A1 input to -5 mV and select the 10-MΩvalue in the A2 feedback path for a -5.000-V output. Repeat as necessary. Linear Technology. Linear Applications Handbook, 1990.p. AN9-8.



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