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OPA860 Output Inverted

Other Parts Discussed in Thread: OPA860

Hello E2E Team,

I have a customer that is trying to implement and simulate the OPA860.  They are currently using the device as a current source to test a trans-impedance amplifier(TIA) circuit.

The setup is simply Function Generator àOPA860 circuit -> TIA input. The OPA860 schematic is attached.

Where the function generator would be V3, with an output similar to that spice model, essentially just some pulses with about 10us width and about a volt high.

The issue I am having is that the signal I am getting at the TIA is always inverted. I have been dealing with this just by inverting the function generator output but was hoping you might have some insight.

 

Any idea what is causing the signal to get inverted?

Thanks!