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ADS131E08S or ADS131E08

Paulo Farina1
Prodigy 20 points
Other Parts Discussed in Thread: ADS1299, ADS131E08, ADS131E08S, ADS1298

Hi,

We are choosing an ADC for a new biosignal aquisition prduct (we are using the ADS1299 in some projects and it works fine, but 16k Hz is not enough for that application).

The ADS131E0? are candidates, but as much as I could see the ADS131E08S is better than the ADS131E08 in some aspects and the later is not better in any aspect, despite both have the same price.

I am afraid I ve missed some characteristic that could be important for us.

Does anyone knows a reason to use the ADS131E08 instead of the ADS131E08S in a new project?

Thanks,

Paulo

  • 0
    TI__Mastermind 38745 points
    Hello Paulo,

    I would advise against using the ADS131E08 as an ECG front end. Note that in the ADS1299 datasheet, the input bias current is listed as a maximum of 300 pA making it a great device to serve as the front end for biopotential measurement. The ADS131E08 front end, however, has no maximum listed for input bias current and the typical number is significantly higher. Indeed the front end of the ADS131E08 is configured differently than the ADS1299 on the IC. If you were to use the ADS131E08, I'd recommend using another stage in front of that chip with a maximum listed for input bias current.

    Otherwise, the ADS1298 also has a maximum low input bias current and can sample at up to 32 kSPS, but has slightly higher noise than the ADS1299.

    The ADS131E08 was developed for power grid infrastructure applications. The ADS131E08S is a version of that device that features a faster startup time that is useful in circuit breaker systems that are powered from the line they are breaking. That is the main functional difference between the devices, though they may be some slight performance differences. For example there are slight differences in the DC and AC performance data in the respective Electrical Characteristics tables.

    Regards,
    Brian Pisani