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ADS1261: Will this device work with at least 300SPS and 0.076uV sensitivity?

Genius 13859 points
Part Number: ADS1261

Hi Experts,

We would like to consider the ADS1261 product.

Cx want to use sinc5 filter and 400sps data rate. In this case, (Q1) how many bits would the resolution be? Data sensitivity is 0.076uv. Want to send it digitally with the help of adc within 3ms. Data rate should be at least 300sps. They will send data with a sensitivity of 0.076uv.

(Q2) Given those requirements, does ADS1261 applicable?

Regards,
Archie A.

  • Hi ArTzy,

    A couple of points about the ADS1261:

    • The sinc5 filter is only available for data rates >7200 SPS. So if you want a data rate that is ~300 SPS, you can choose from a sinc1 - sinc4 filter
    • The actual ADC conversion latency is given in Table 8 in the datasheet (section 9.4.1.3). This table shows the first conversion latency, which is applicable if you are multiplexing through the input channels and taking one sample on each channel
    • Refer to Table 1 for the ADC noise performance. This shows the noise performance as a function of data rate, filter type, and gain. I am not sure what gain you can use because your input signal range was not given. However, the only settings that come close to meeting your requirements are 400 SPS, sinc4 filter, gain = 64 or 128. Also note that the noise given in these tables is with the inputs shorted, and therefore represents the ADC noise under best-case conditions. Once you actually measure a signal you will add more noise from the reference, input source, etc., that will likely drive up the noise beyond the level shown in Table 1. In other words, I am not sure the ADC will be the limiting factor as it relates to noise

    Let me know if you have additional questions

    -Bryan