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OPA379: What is the EMI performance in respect to the LMV831?

Part Number: OPA379
Other Parts Discussed in Thread: LMV831, , LPV801


We have the LMV831 in our current design to measure low voltage signals. Our design also contains a 2G/3G modem. When the modem is communicating through 2G/3G, the signal from the OPAMP must remain stable/clean. This works fine with the current LMV831.

To reduce power-use we are looking into the OPA379, which seems to work for us according to the specifications. But there is not much information about the EMI behavior.

Is there information about the EMI performance of the OPA379 in respect to the LMV831?

Best regards,


  • Sander
    The LMV831 was one of our first amplifiers with EMI hardening built in and that is why you see all the extensive test results in the datasheet. I am performing a search for any details that could support such a claim for the OPA379 but at this point I have not found anything. How low in bandwidth can you support and what is your operating voltage. I am asking because our LPV801 family does have EMI hardening built in but the bw is 8kHz. I will update with another post if I am able to find any details to support an EMI hardened claim for the OPA379.
  • Hello Check,
    Thanks for your reply. The LPV801 does look good (my needed bw is 1kHz @ 3V power-supply). The LPV801 is only not pin compatible with the LMV831. I am making a PCB update, so I have the option to change the pinning. But then I need to make sure that the LPV801 performs the same (or better) then the LMV831 (we previously did a lot of testing on the LMV831 in the design phase).
    Can you give me any information about the LPV801 in comparison with the LMV831?
  • Sander
    we actually have an EMIRR plot in the typical performance curves of the datasheet (page 11, figure 36)
    in addition, I can tell you that we did some bench mark comparisons with competitive devices in our low power amplifier market and found that our device outperformed competition when tested and configured in identical manner. the specifica application that we tested was a gas sensor application. I also wanted to tell you that I found some information on the OPA379. this product family also has many of our EMI hardened techniques includes such as low pass filtering on the input pins in addition to other things that we do inside the chip. Unfortunately I was unable to find any test data to help ease your decision.
  • Sander
    I am going to close this thread, but if you need any further assistance feel free to re-open or start a new one.