High_input_voltage_IC_filter

Published:2009/7/24 13:27:00 Author:Jessie | From:SeekIC

This circuit shows how an LTC1062 can be connected to accommodate high input voltages outside the normal input common-mode range. The dc gain of the low-pass filter is: R2/(R1 + R2). For maximum passband flatness, the paralleled combination of R1/R2 should be chosen as: R1/R2≥ 5 kΩ. Notice that there is no need for an external op amp to buffer the divided-down input voltage. The internal buffer input (pin 7) performs this function. Linear Technology Corporation, Linear Applications Handbook, 1992, p. AN24-7.



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