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Some applications may require greater accuracy, improved temperature performance, or gain adjustments which cannot be obtained using the internal reference. An external voltage may be applied to the VREF IN with VREF OUT disconnected for gain adjustment ofup to +10% (the VREF IN pin is internally tied directly to the AD C circuitry). ADC gain and offset will vary simultaneously with external reference adjustment with a 1:1 ratio (a 2% or 50 mV adjustment to the +2.5 V reference varies ADC gain by 2% and ADC input range center offset by 50 mV). Theoretical input voltage range versus reference input voltage may be calculated from the following equations:
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