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ADuCM360 24-bit Delta Sigma INL Spec

Question asked by mwiggins on Jun 13, 2012
Latest reply on Jun 22, 2012 by MikeL

In the preliminary datasheet for the ADuCM360, it says the ADC's Integral Nonlinearity (INL) at Gain=1 is +/-15 ppm of FSR (same as in the ADuC7060). If I do the math for the number of accurate bits in this worst-case nonlinearity scenario, it comes to log2(1/15E-6) = 16 bits. This means at some voltage, the ADC is not better than a 16 bit converter?

 

For example, the LTC2449 has 18.6 bits and the ADS1258 has 18.25 using this same calculation.

 

Is there a plot available showing the INL? Have I made a mistake in my calculation?  Are there different test methods being applied?

 

Your help is appreciated!

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