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ADS1298 Internal Reference to power 7 100uA sensors each

Matias Hochman
Prodigy 10 points
Other Parts Discussed in Thread: ADS1298

I am planning to use the ADS1298 to measure 7 thermistors (10K) each with. I create a voltage divider with a 112k resistor therefore the max current for each sensor is 10uA. Can I connect these sensors to the output of the voltage reference in order to have a ratiometric reading. The max current I will be taking is going to be 100uA.

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    TI__Mastermind 43915 points

    Hi Matias,

    Do you mind showing me a block diagram or something of exactly what you mean. I imagine you plan to run these in series and use the internal reference as the excitation source. The reference can source greater than 100uA (I think up to 10mA) but I have never tried the device in a ratiometic configuration so I am not sure exactly how it would perform. In theory, I do not see a big problem but do need to think about it a little.

    Regards,

    Tony Calabria