In my application, I am using an ADS8345 16-bit, 8-channel ADC in single-ended measurements mode to measure a 1-5V signal from INA333. The conversion is set up using external clock from my Atmega325, which I interface to using the MCU's built-in spi.
My question stems from observing 2 figures in the ADS8345 datasheet - Figure 3 (Single-ended input-common voltage range vs Vref) and the data format table (Table VIII). Namely, in the Data format table, the full-scale range is described as 2xVref, ranging from +full-scale to -full-scale (0x7FFF - 0 - 0x8000), with midscale being 0V. However, at 2.5V, this would mean the full-scale is 5V. Could I get some clarification on the actual usable ranges, or is my application (1-5V measurements, with 0-1V range not being counted [essentially throwing away 20% of the measurement range] )
What am I missing here? Is it even possible to use this ADC for inputs that aren't +/- around some range (0V midscale in this case)?