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ADS7253: how to design anti-alias filter for INA240+ADS7253?

Yuan Tan63
Expert 3280 points
Part Number: ADS7253

Hi,

Here is a customer design using INA240+ADS7253 as below. The sampling frequency is 10ksps, working common voltage is 48~72V. They found anti-alias filter(R30,R31,C17) influence the sampling performance a lot, sampling vibration appears. Do you have any suggestion on anti-alias filter design? thanks!

and from the pictures below, the RFTL is really different for with amps and without, does that mean ADS7253 must need a amps?

  • 0
    TI__Mastermind 24940 points

    Hello,

    Part of our growing online tutorials, Precision Labs, there is a section on AC specifications for an ADC

    Within this topic there is a video that speaks to antialiasing, and designing an antialiasing filter, using Filter Pro.

    Called Aliasing and Ant-aliasing Filters

    This software will  design the component values and use the desired filter topology.

    I suggest watching this video and using this software to help.

    Also, you can build a SPICE simulation for the circuit you are using to verify performance before physically building it. this is also covered in Precision Labs ADC

    Depending on the sampling rate and the input source to the ADC, an op amp might not be needed.

    for very slow moving inputs, and more low sampling rates, an input driving op amp is usually not needed. This is why the component values are different. Each circuit is optimized for its specific use case.

    Regards

    Cynthia