Hi Mitchell, The figure 38 is showing the normalized gain with respect to internal reference 2.4V. This can be used for systems that require the analog signal gain to be adjusted or calibrated, this can be performed by using an external reference. So going from 2.4V reference to 2.7V reference will change your gain by ~1dB. So you can use External reference to change the effective gain instead of change the input signal level. The negative value means if input signal same amplitude is applied to the ADC's input with 2.4V reference versus 2.7V external reference the ADC will read the input signal as 1 dB lower when using higher external reference(2.7V). Regards, Neeraj
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