[quote user="Ahmed Kamel"]I need to know the effect of reducing the supply voltage on the controller internal reference voltage.[/quote] As long as "reduced supply voltage" is within recommended range, ADC performance will conform to specification stated in tables 5-28 and 5-30 (table 5-28 shown): Also there are PSRR (power supply rejection ratio) specified for reference alone (table 5-34) which is typical 120uV/V, max 400uV/V.
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