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ADS131A02: Using device to measure DC

ajayt
Genius 9555 points

Part Number: ADS131A02

HI Team, I am using this device to measure a DC signal,

            At 4Mhz data sheet says device has differential impedance of approx 100 ohms from fig 28. Does this impedance still stand if measuring dc. A 100 ohm differential impedance requires a signal source of 0.1 ohm for 0.1% accuracy?

            Does the device reset the sampling capacitor before charging to next sample, or will the sampling capacitor in the case of dc be close between samples.

 

  • 0
    TI__Guru 68916 points
    Hello Ajayt,

    Thanks for your post.

    The input impedance vs. modulator clock in Figure 28 is plotted in "kOhms." At 4.096 MHz, the typical input impedance is about 130k ohms.

    Yes, the sampling capacitor is shorted out between samples.

    Best Regards,