Analog to digital conversion
Two reference voltage
- mark bottom and top end of range of analog values that can be converted ( VL and VH )
- voltage to convert must be within these bounds ( VX )
Successive approximation
- most approaches to A/D conversion are based on this
- 8 to 16 bits of accuracy
Approach
- sample value
- hold it so it doesn’t change
- successively approximate
- report closest match