Many customers have asked how to add input filtering to theINA117. Since the INA117 is rated for ±200V input voltage(±500V without damage), it is commonly used in environmentswith very high input noise or with high-voltage inputtransients. This bulletin shows how to connect input filters,discusses the errors they can add, and shows how to eliminatethe errors.Figure 1 shows the connection of a differential input filter.A pole is formed by C1 and the two external input resistors.f–3dB = 1/(4 • p • RI • C1). Differential input filtering ispreferred because mismatches in filter components do notdegrade CMR.
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