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ADS1261: How to get the lowest Noise

Alex Chen9
Expert 1075 points
Part Number: ADS1261

HI Sir

Data Sheet shows the : 30 nVRMS (20 SPS, Gain = 128)

if I want to get lowest Noise,Can I reduce the SPS to 2.5?

if SPS 2.5 Can get the lowest Noise, why data sheet feature show the 30 nVRMS (20 SPS, Gain = 128)

please advise it,thanks

  • 0
    TI__Guru* 97465 points
    Alex,


    In general, yes for these delta-sigma (oversampling) type ADCs, the lowest noise is often found at the lowest data rate. However, it's not very common for people to use the ADC at very low data rates. It is far more common to use the device at 20SPS than at 2.5SPS and that is why it is listed that way on the front page. If you want the lowest noise, then use the 2.5SPS data rate.

    Note that the noise is a function of many things, including the type of digital filtering, the noise of the reference, layout, power supply rejection. It's often difficult to get noise performance with the type of resolution that the ADS1261 has. Before starting a circuit design and layout, I would certainly look at the ADS1261EVM. This board should give performance similar to that in the datasheet. Look over the layout and schematic of the board to see how it is put together. If you can, get one of these boards to test out the application.

    After you are done with the design, put up another post. We would be happy to review it and help you get the performance you need.


    Joseph Wu