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| MC68HC708MP16 Datasheet, PDF (358/398 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Analog-to-Digital Converter (ADC)
19.7 I/O Signals
The ADC module has 10 I/O signals that are shared with port B and
port C.
19.7.1 ADC Analog Power Pin (VDDAD)
The ADC analog portion uses VDDAD as its power pin. Connect the
VDDAD pin to the same voltage potential as VDD. External filtering may be
necessary to ensure clean VDDAD for good results.
NOTE: Route VDDAD carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
19.7.2 ADC Analog Ground Pin (VSSAD)
The ADC analog portion uses VSSAD as its ground pin. Connect the
VSSAD pin to the same voltage potential as VSS.
19.7.3 ADC Voltage Reference Pin (VDDAREF)
VDDAREF is the power supply for setting the reference voltage VREFH.
Connect the VDDAREF pin to the same voltage potential as VDDA.
19.7.4 ADC Voltage Decoupling Capacitor Pin (VADCAP)
VADCAP is one of two reference supplies and is generated from VDDAREF
with a value (VDDAREF)/2. Place a bypass capacitor on this pin to
decouple noise. VADCAP pin can also be used to drive an upper
reference value of (VDDAREF)/2 with an external voltage reference.
Technical Data
358
Analog-to-Digital Converter (ADC)
MC68HC708MP16 â Rev. 3.1
Freescale Semiconductor
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