Other Parts Discussed in Thread: OPA1692, OPA1641
Hi,
I'm having some problem with the OPA207 PSpice model in LTSpice (sorry, I can't use TINA as I only have a Mac). The model is giving me what looks like incorrect noise figures.
In the case of an isolated amp, non-inverting, unity gain, +ve terminal grounded, LTSpice is giving me 8.47nV/rtHz vs 7.5nV/rtHz in the datasheet
In the case of the above but with a 64k source impedance, LTSpice is giving me 59.86nV/rtHz versus a calculated value of 35.24nV/rtHz
If I change the opamp to an OPA1692, LTSPice and a calculated value strongly agree - 40.3nV/rtHz for LTSpice vs 40.39nV/rtHz calculated
I know it is not your responsibility to respond to LTSpice issues but I'm wondering if there is an issue in the model. I can't cross-check on TINA unfortunately.
Andy advice would be welcome.
REgards,
ac