AD777x:What is the input voltage range of the ADC?

Question

Accepted Answer

The input voltage range of the ADC depends on the analog voltage supplies (AVDDx and AVSSx), the reference used (Vref), the configured PGA gain and the type of signal connected to the input (single ended, differential, and pseudo-differential). 
 The figures shown below summarizes all the possible configurations and the maximum dynamic range as a function of the parameters mention before. 
 
 Examples of different input range configurations:

Input signal type 
 AVDD from GND 
 AVSS FROM GND 
 Vref from GND 
 VCM from GND 
 Pgain 
 AINx+ max without limitation 
 AIN+ min without limitation 
 AINx- max without limitation 
 AIN- min without limitation 
 Absolute maximum Voltage Rail 
 Absolute Minimum voltage Rail 
 AIN+ max 
 AIN+ min 
 AIN- max 
 AIN- min 
 max{(AINx+)-(AINx-)} 
 min{(AINx+)-(AINx-)}

True differential 
 1.65 
 -1.65 
 2.5 
 0 
 1 
 1.25 
 -1.25 
 1.25 
 -1.25 
 1.55 
 -1.55 
 1.25 
 -1.25 
 1.25 
 -1.25 
 2.5 
 -2.5

Pseudo Differential 
 1.65 
 -1.65 
 2.5 
 1 
 1 
 3.5 
 -1.5 
 1 
 1 
 1.55 
 -1.55 
 1.55 
 -1.5 
 1 
 1 
 0.55 
 -2.5

Single ended 
 1.65 
 -1.65 
 2.5 
 - 
 1 
 0.95 
 -1.55 
 -1.55 
 -1.55 
 1.55 
 -1.55 
 0.95 
 -1.55 
 -1.55 
 -1.55 
 2.5 
 0

True differential 
 3.3 
 0 
 2.5 
 1.65 
 1 
 2.9 
 0.4 
 2.9 
 0.4 
 3.2 
 0.1 
 2.9 
 0.4 
 2.9 
 0.4 
 2.5 
 -2.5

Pseudo Differential 
 3.3 
 0 
 2.5 
 1.65 
 1 
 4.15 
 -0.85 
 1.65 
 1.65 
 3.2 
 0.1 
 3.2 
 0.1 
 1.65 
 1.65 
 1.55 
 -1.55

Single ended 
 3.3 
 0 
 2.5 
 - 
 1 
 2.6 
 0.1 
 0.1 
 0.1 
 3.2 
 0.1 
 2.6 
 0.1 
 0.1 
 0.1 
 2.5 
 0

True differential 
 1.65 
 -1.65 
 2.5 
 0 
 2 
 0.625 
 -0.625 
 0.625 
 -0.625 
 1.55 
 -1.55 
 0.63 
 -0.63 
 0.625 
 -0.625 
 1.25 
 -1.25

Pseudo Differential 
 1.65 
 -1.65 
 2.5 
 0 
 2 
 1.25 
 -1.25 
 0 
 0 
 1.55 
 -1.55 
 1.25 
 -1.25 
 0 
 0 
 1.25 
 -1.25

Single ended 
 1.65 
 -1.65 
 2.5 
 - 
 2 
 -0.3 
 -1.55 
 -1.55 
 -1.55 
 1.55 
 -1.55 
 -0.3 
 -1.55 
 -1.55 
 -1.55 
 1.25 
 0

True differential 
 3.3 
 0 
 2.5 
 1.65 
 2 
 2.275 
 1.025 
 2.275 
 1.025 
 3.2 
 0.1 
 2.28 
 1.025 
 2.275 
 1.025 
 1.25 
 -1.25

Pseudo Differential 
 3.3 
 0 
 2.5 
 1.65 
 2 
 2.9 
 0.4 
 1.65 
 1.65 
 3.2 
 0.1 
 2.9 
 0.4 
 1.65 
 1.65 
 1.25 
 -1.25

Single ended 
 3.3 
 0 
 2.5 
 - 
 2 
 1.35 
 0.1 
 0.1 
 0.1 
 3.2 
 0.1 
 1.35 
 0.1 
 0.1 
 0.1 
 1.25 
 0

Tool which used to calculate the allowed input voltage range as a function of the input parameters: 
 XLS