Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
978
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
Figure 38-3. External Analog Reference Schematic With One Reference
Notes: 1. These values are given as a typical example.
2. Decoupling capacitor should be placed close to the device for each supply pin pair in the signal group.
Table 38-2. External Analog Reference Connections
Signal Name
Recommended Pin Connection
Description
AREFx
1.0V to V
DDANA
- 0.6V for ADC
1.0V to V
DDANA
- 0.6V for DAC
Decoupling/filtering capacitors
100nF
100nF
and 4.7µF
External reference from AREFx pin on
the analog port
the analog port
GND
Ground
GND
AREFA
EXTERNAL
REFERENCE
4.7µF
100nF
GND
AREFB
100nF
Close to device
(for every pin)