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OPA2134: EMIRR DATA for OPA2134 and RC4580

Part Number: OPA2134
Other Parts Discussed in Thread: RC4580, , OPA2180


   Our current sensor is easy to be influenced by EM waves in some frequency points, and its OPAMP is RC4580. But I tested out that its EMIRR is above 50dB in 10MHz-1GHz, so it shouldn't come out Dozens of millivolt in the output port.  So I want to ask if TI can share the EMIRR test report of RC4580 and OPA2134?  and to make a study of EMIRR, I also want to know which OPAMP is not EMI robustness because I want to know magnitude  of the offset shift caused by EM waves. 

  • Hello user5239812,

    Unfortunately, TI will not be able to do specific EMIRR testing for the RC4580, or OPA2134. They are both legacy devices, designed before EMIRR was being characterized for op amps. EMIRR testing of such devices must be justified based on business opportunity because it costs money, time and resources for us to do the work.

    I suggest you consider a more modern precision op amp that includes the EMIRR performance information in its datasheet. It would seem for your current sensor application that an audio op amp such as the RC4580, or OPA2134, might not be the optimum choice because of their loser dc specifications. A zero-drift op amp such as the OPA2180, that has a published EMIRR graph (datasheet Fig. 24) should provide higher precision in that application.

    You might want to have a look at the OPA2180 datasheet and see the high level of dc performance that can be achieved with this op amp:

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • Thanks, Thomas. You have transmitted enough information to me, I will accept your advise and think about the OPA2180.