Interfacing PIC Microcontrollers

Amplifier Interfaces

Having developed the analogue input conversion and display process, we can

move on to the interfacing hardware itself. Input signals often need condition-

ing before being fed to the MCU analogue inputs. This can involve amplifiers

to increase the signal amplitude, attenuators to reduce it, and filters to change

the frequency response. For now, we will limit ourselves to DC signals and

amplifiers, as these are most frequently used in MCU applications and are more

straightforward. For processing of AC signals, standard references should be

consulted.

Figure 7.6 shows a range of different amplifiers connected to the PIC MCU.

They are ...