Datasheet

Analog-to-Digital Converter (ADC)
Technical Data MC68HC908GR8 — Rev 4.0
84 Analog-to-Digital Converter (ADC) MOTOROLA
5.7.1 ADC Analog Power Pin (V
DDAD
)/ADC Voltage Reference High Pin (V
REFH
)
The ADC analog portion uses V
DDAD
as its power pin. Connect the
V
DDAD
pin to the same voltage potential as V
DD
. External filtering may be
necessary to ensure clean V
DDAD
for good results.
NOTE: For maximum noise immunity, route V
DDAD
carefully and place bypass
capacitors as close as possible to the package.
5.7.2 ADC Analog Ground Pin (V
SSAD
)/ADC Voltage Reference Low Pin (V
REFL
)
The ADC analog portion uses V
SSAD
as its ground pin. Connect the
V
SSAD
pin to the same voltage potential as V
SS
.
NOTE: Route V
SSAD
cleanly to avoid any offset errors.
5.7.3 ADC Voltage In (V
ADIN
)
V
ADIN
is the input voltage signal from one of the six ADC channels to the
ADC module.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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