Peter, ADCLO is an input voltage as you said. It is used as the base (or "Low") voltage against which ADC input channel voltages are converted. If you look at section 4.7 of the datasheet, SPRS439m, you can see that the ADC conversion equation incorporates ADCLO: ADCLO is nominally supposed to be at ground potential (0 volts). Table 6-50 is saying that it needs to be within 5 mv of ground for the device (e.g, ADC) to perform according to the datasheet performance specifications. Regards, David
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