ADS9224R: FSR of ADS9224R

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,