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25 ADC - Analog to Digital Converter
Quick Facts
What?
The ADC is used to convert analog signals
into a digital representation and features 8
external input channels
0 1 2 3
4
Why?
In many applications there is a need to
measure analog signals and record them in
a digital representation, without exhausting
your energy source.
+
ADC
-
...0101110...
How?
A low power Successive Approximation
Register ADC samples up to 8 input channels
in a programmable sequence. With the help
of PRS and DMA, the ADC can operate
without CPU intervention, minimizing the
number of powered up resources. The ADC
can further be duty-cycled to reduce the
energy consumption.
25.1 Introduction
The ADC is a Successive Approximation Register (SAR) architecture, with a resolution of up to 12 bits
at up to one million samples per second. The integrated input mux can select inputs from 8 external
pins and 6 internal signals.
25.2 Features
? Programmable resolution (6/8/12-bit)
? 13 prescaled clock (ADC_CLK) cycles per conversion
? Maximum 1 MSPS @ 12-bit
? Maximum 1.86 MSPS @ 6-bit
? Configurable acquisition time
? Integrated prescaler
? Selectable clock division factor from 1 to 128
? 13 MHz to 32 kHz allowed for ADC_CLK
? 18 input channels
? 8 external single ended channels
? 6 internal single ended channels
? Including temperature sensor
? 4 external differential channels
? Integrated input filter
? Low pass RC filter
? Decoupling capacitor
? Left or right adjusted results
? Results in 2’s complement representation
? Differential results sign extended to 32-bit results
2011-04-12 - d0001_Rev1.10
341
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