Motorola ColdFire MCF5281 - Manual (Page 602)

Queued Analog-to-Digital Converter (QADC)
28-64 Freescale Semiconductor
28.9.6 Analog Input Considerations
The source impedance of the analog signal to be measured and any intermediate filtering should be
considered whether external multiplexing is used or not.
Figure 28-52 shows the connection of eight
typical analog signal sources to one QADC analog input signal through a separate multiplexer chip. Also,
an example of an analog signal source connected directly to a QADC analog input channel is displayed.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3