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OPA2991: Specific application requirement review

Tess Chen
Intellectual 2675 points
Part Number: OPA2991
Other Parts Discussed in Thread: OPA2156, TLV9152

Hi,

Please find the application for sensor resistance measurement circuit in the below. Rm is the resistance to measure and Rt is temperature compensation resistance. Rt=480~600ohm; Rm=220~270ohm, R1=1K, R2=620.  Could OPA2991 replace the TS922A  in this kind of application? Or does there any other suitable op amps can do this? Thanks.

  • 0
    Guru 242810 points

    The OPA2991 indeed has very similar characteristics. The search function also shows TLV9152 (slightly smaller output current) and OPA2156 (higher precision but higher power usage and minimum supply voltage).

  • 0
    TI__Genius 15410 points

    Hi Tess,

    I think the OPA2991 is a good replacement here. Another option, like Clemens mentioned, is the TLV9152. The main difference between these devices is the supply voltage, 40V vs 16V. But there are also a few other specification difference. In general, the OPA2991 will be higher performance than the TLV9152.

    Thank you,

    Tim Claycomb