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21
ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
3.9
Analog I/O
3.9.1
Analog Reference
The SAM4C features a LM4040 precision micropower curvature-corrected bandgap shunt voltage reference with a
several fixed reverse breakdown voltages. The device voltage reference on the board is 3.0V.
Figure 3-19.
Analog Reference Schematic
3.9.2
Analog Input
One potentiometer VR1 multi-turn 10K
Ω
is connected to the jumper JP4. If JP4 is closed, this analog reference is
available on analog input PA4.
Figure 3-20.
Analog Input Schematic
+3V3
+3V
ADVREF
VDDIN
VDDREF
5V
R8
.
2.2
Ω
D1
C25
22µF
R7
C22
2.2µF
C27
10nF
+
C26
10µF
TP3
L1
56µH
C23
100nF
C28
100nF
TP2
JP5
1
2
3
RC0603JR-073K3L
LM4040AIM3X-3.0/NOPB
(Analog input)
PA4
VDDIN
C21
10nF
JP4
VR1
10K
3
1
2
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