INA849: CMRR - Simulation vs datasheet graph

Michael Daimer

Intellectual 1645 points

Part Number: INA849

Tool/software:

Hello TI expert,

the simulation model of INA849 with TINA TI for 1Meg is ~75 dB with Gain = 1:

The datasheet shows a graph of CMRR vs frequency as follows:

What value could be considered as more realistic?

Thanks and best regards,

Michael

5 months ago

+1 Gerasimos Madalvanos 5 months ago

TI__Mastermind 31676 points

Hey Michael,

I would follow the datasheet typical characteristics graph. Typically the measurements for low frequency AC characteristics may be more accurate in the model, as it is hard to measure very accurately at low frequency. However, for higher frequency measurements I would follow the datasheet.

Best,
Jerry

0 Michael Daimer 5 months ago in reply to Gerasimos Madalvanos

TI__Intellectual 1645 points

Hi Jerry,

thanks for the quick response and clarification.

Best regards,

Michael

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INA849: CMRR - Simulation vs datasheet graph