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Invert the negative signal need two resistor and opamp. I think it will lost some precision.laktronics said:Hi,
Either you need to invert the negative signal and apply, or, you can level shift the signal around half Vcc, apply it to IN+ and connect IN- to half Vcc. Vref in the second case should be Vcc and the shifted signal range to be adjusted to be within 0 to 5V.
Normally, if the signal is floating, you should ground the -ve lead and connect the positive lead directly to IN+ without any problem.
Regards,
Laktronics