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INA821: INA821 noise than AD8221

Chen Alex1
Genius 3765 points
Part Number: INA821

Tool/software:

HI Sir

I use the INA821 to replace ADI/AD8221,

But the reading ad8221 is 60UV, but the INA821 is 100UV

maybe is the BW ,result in the noise

did you have any advise? or others solution, i don't want to adjust others R/C

Thanks

  • 0
    TI__Mastermind 32951 points

    Hello,

    If there is not any external filtering, the INA821 will have more noise than the AD8221. Even though INA821 has 7nV/rtHz and AD8221 has 8nV/rtHz, the INA821 will integrate this noise over a wider bandwidth, just like you suggested.

    If the external filtering sets the bandwidth of the INA821 circuit to the same bandwidth as the AD8221, the INA821 will have superior noise performance.

    Otherwise, if looking for a different device, there have to be other trade-offs. What key specs are important (other than noise), and what specs can be adjusted?

    Best,
    Gerasimos