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Measuring negative voltage

Other Parts Discussed in Thread: ADS8671, ADS8685, ADS8689

My design receives a -38V to -60V voltage input over a long cable (100 ft - 300 ft). This board will have an MCU with/without ADC on it. I want to measure incoming negative voltage and communicate it over the long cable to the system at the other end of the cable.

The board will convert -38V to -60V power to 3.3V and 12V/5V for the local digital circuits. I am unsure how negative voltage ground will impact if I use OpAmp/ADC. Does TI have any solution to deal with such a scenario?