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Replies: 2
Views: 35
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
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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
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In reply to Ryan Andrews:
Hi Ryan,
Thanks for your answer.