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ADS9224R: FSR of ADS9224R

Genius 9465 points

Replies: 2

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Part Number: ADS9224R

Hi team,

Why the FSR is different between fIN=2kHz and fIN=100kHz according to the datasheet?

Thanks and best regards,
 Charles Chen
 Applications Engineer | LED Drivers


Check out these helpful resources

LED Drivers ICs | LED Drivers Reference designs | LED Driver Basics Training series 

  • Hi Charles,

    Thank you for your post.

    What you're referring to is the amplitude of the input test signal. The full-scale range of the ADC is not dependent on the input frequency and is always equal to +/- 4.096V when VREF = 2.5 V.

    For testing purposes, we often limit the input amplitude to -0.5 dBFS. This is commonly done as an industry standard to avoid unwanted non-linearities that come from operating at or above the ADC supplies. At higher frequencies, these non-linearities can be more exaggerated even when the amplitude is less than the supply. As expected, there is a noticeable drop-off in noise and linearity performance between 100 kHz and 1 MHz.

    Best regards,


    Ryan Andrews

    Applications Engineer | Precision ADCs 

    Are you working on a bio-potential application? Check out these helpful resources: ADS129x BIOFAQ | ECG Online Training

  • In reply to Ryan Andrews:

    Hi Ryan,

    Thanks for your answer.

    Thanks and best regards,
     Charles Chen
     Applications Engineer | LED Drivers


    Check out these helpful resources

    LED Drivers ICs | LED Drivers Reference designs | LED Driver Basics Training series 

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