Amp for low-level sensor telemetry data in communication satellites

Intersil’s ISL70617SEH is a high-performance, differential input, differential output instrumentation amplifier aimed at precision -to-digital applications. It can operate over a supply range of 8 volts (±4) to 36 volts (±18) and features a differential input voltage range up to ±30 volts. The output stage has rail-to-rail output drive capability optimized for differential analog-to-digital converter () driver applications. Separate supplies power the output stage, enabling the output to be driven by the same low-voltage supplies powering the ADC; this configuration provides protection from high-voltage signals and the low-voltage digital circuits.

The gain of the ISL70617SEH can be programmed from 0.1 to 10,000 via two external resistors, RIN and RFB; gain accuracy is determined by the matching of RIN and RFB. The gain resistors have Kelvin sensing, which removes gain error due to PC trace resistance. The input and output stages have individual power-supply pins, which enable input signals riding on a high common-mode voltage to be level shifted to a low voltage device, such as an ADC. The ISL70617SEH is offered in a 24-lead ceramic flatpack package with an operating temperature range of -55 °C to +125 °C.

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