Analog-to-Digital Converter (ADC)
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
28-38
V
REFH
is as noise-free as possible. Any noise residing on the V
REFH
voltage is directly transferred to the
digital result.
illustrates the internal workings of the ADC voltage reference circuit. V
REFH
must be noise
filtered; a minimum configuration is shown in the figure.
28.5.11 Supply Pins V
DDA
and V
SSA
Dedicated power supply pins are provided for the purposes of reducing noise coupling and to improve
accuracy. The power provided to these pins is suggested to come from a low noise filtered source.
Uncoupling capacitors ought to be connected between V
DDA
and V
SSA
.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
