
Analog Toolbox 11
This chapter contains some miscellaneous topics and topics that pull together
multiple concepts from preceding chapters.
Microcontroller Supply and Reference
Chapter 2 mentioned the effect that supply voltage can have when used as a
reference for microcontroller-based analog inputs. In many cases, you can
minimize these effects by referencing your analog inputs to the supply voltage.
Figure 11.1A shows a thermistor connected to an analog input and using a
pull-up to a precision reference voltage. At first glance, it might appear that
this is a very accurate design because the precision reference gives a repeatable
voltage versus temperature ...