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AFE0064: Full Scale Range

May
Genius 9880 points
Part Number: AFE0064
Other Parts Discussed in Thread: DDC112

Hi,

In the datasheet it mention Eight Adjustable Full Scale Ranges (0.13 pC min to 9.5 pC max).

Does that mean that the largest input charge that can be tolerated is only 9.5pC?

If the application needs 150nC of charge is there a workaround to do regarding this or is there other IC that can meet this requirement?

Thank you in advance.

Regards,
Maynard

  • 0
    TI__Prodigy 630 points

    Hi Maynard,

    the AFE0064 has max. charge range = 9.6pC. 

    1) what is charge integration time? The AFE0064 can operate at faster speed. With faster speed charge acquired per scan will reduce. there are some tradeoffs to be consider in this method.

    2) you can also check TI's CT family products.  Most of latest devices support hundreds of pC. Some DDC family devices with less channel count (DDC112) can support 1nC charge with external capacitor.

    https://www.ti.com/data-converters/integrated-special-function/medical-afes/computer-tomography-afes/products.html

    There are some more possible options. To suggest optimal solution, we need to understand application requirements like noise, speed, number of channels etc. This may include some NDA restricted information. So, if you are ok, can we have further discussion over email?