Analog to Digital Converters

Notes

1. All devices have tristate or open-drain data outputs to enable multiple devices to share a single data bus. 
2. Vlow and high refer to the minimum and maximum input voltages that the A/D converter can accept.  V1 and V2 refer to a variable upper limit that the designer can specify.
3. SE/DE: single-ended input or differential input refers to whether you are measuring voltage at a point with respect to a shared ground (most common) or you are measuring the difference in voltages between two points?  In the latter case, the voltages still must be referenced in some manner to ground; unlike the single-ended case however, one does not need to be equal to ground.  Differential inputs are used to measure small-signals along high-impedance wires that are susceptible to coupled noise; any noise that gets coupled to a differential signal is added to both lines and does not show as a difference.