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Documents ADUC834: What's the difference between the INL spec and the noise spec on the ADC?
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    • The ADuC834 has separate pins for analog and digital power supplies. Can I run from a split supply, for example a 3.3V DVDD and a 5V AVDD?
    • ADUC834: Can I convert a single-ended input voltage by grounding one of primary ADC diff inputs?
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    • ADUC834: Impact of fast logic edges on analog performance
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    • ADUC834: Is it possible to accidently write to security bits and prevent part entering download mode?
    • ADUC834: Is it possible to switch OFF the internal buffer of primary ADC?
    • ADUC834: Minimum and maximum external voltage references allowed by the ADuC834.
    • ADUC834: Overwriting the ADC factory calibration coefficients
    • ADuC834: pinout decriptions missing for CSP pins 28and 29
    • ADUC834: Should I use the internal voltage reference or an external voltage reference?
    • ADUC834: The reference input is differential. Can I use a single ended reference?
    • ADUC834: Use of PSEN pin on Microcontroller v 8051
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    • ADUC834: What is lowest power consumption configuration for 10 hour sample conversion intervals?
    • ADUC834: What is the minimum time (or ADC cycles) to get a reading if the input is a step?
    • ADUC834: What's the difference between the INL spec and the noise spec on the ADC?
    • ADUC834: Why does ADC effective resolution depend on range and update rate
    • ADUC834: Why is there a different result when using internal voltage ref compared to external 2.5V ref?
    • Why does it take the ADuC834 so long to power on?
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ADUC834: What's the difference between the INL spec and the noise spec on the ADC?

Q 

What's the difference between the INL spec and the noise spec on the ADC?

 

A 

Any given ADC conversion result has both an INL error and a noise error. The
INL specification is
15ppm of FSR max (i.e. the INL error at any given code is accurate to at least
16 bits). Depending
on the range and the update rate this ADC conversion result will have a varying
amount of noise
on it.
The noise which exists on this ADC conversion result is random and is equally
as likely to be
positive as negative. Hence by doing more averaging this noise error can be
reduced. Since the
INL will stay constant for every ADC conversion (given the same DC input) then
software
averaging will not remove the INL error.

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