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Part Number: ADS9224R
How to understand the following sentence mentioned in application report "SLAA013"?
"The limit of a 1/2 LSB differential linearity error is a missing code condition which is equivalent to a reduction of 1 bit of resolutionand hence a reduction of 6 dB in the SNR"
Why 1/2 LSB DNL equals to a reduction of 1bit resolution rather than 1LSB DNL?
Thanks and best regards, Charles Chen Applications Engineer | LED Drivers
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Thank you for your post. I've edited the title as this question can apply to all data converters in general.
Of course, data converters have a finite number of codes in their transfer function, so there is a possible range of input voltages that could produce the same code in an ADC. The ideal voltage is at the center of the code "step." Each step is 1/2 LSB away from transitioning to the previous or next code (hence +/- 1/2 LSB from the ideal input voltage). If your non-linear error is greater than 1/2 LSB, this is enough to cause the ADC code to transition to the previous or next code, depending on the sign of the error.
Applications Engineer | Precision ADCs
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In reply to Ryan Andrews:
Thanks for your answer.
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