Hi,
I tried to simulate INA849 with the following spec.
- Vin+ : 3.5V
- Vin- : 3.4V
- Gain: 9
- Vdiff: 100mV
- VCM: 3.45V
- Vout observed: 1.0V
- Vout expected: 0.9V
Any clue?
TINA simulation model attached
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Hi,
I tried to simulate INA849 with the following spec.
Any clue?
TINA simulation model attached
Hi Sadashiva,
Thanks for your post, I can help you. This appears to be a model issue. Based on your input parameters, the output should be 900mV. The INA VCM v VOUT calculator tool confirms that your input and output are within linear operating range.
What's interesting is if I change IN+ to 3.6V and IN- to 3.5V, the model seems to "work" as we expect. Looks like a simulation / calculation quirk. I have sent this issue over to our model expert to further investigate.
We don't expect the actual INA849 silicon to behave this way. Your circuit is within linear operating range.
Thanks this helps, I did simulation in PSpice also. Same error is observed. It should be model related error