Datasheet

Figure 42-2. External Analog Reference Schematic With Two References
GND
AREFA
EXTERNAL
REFERENCE 1
4.7µF 100nF
GND
AREFB
EXTERNAL
REFERENCE 2
4.7µF 100nF
Close to device
(for every pin)
Figure 42-3. External Analog Reference Schematic With One Reference
GND
AREFA
EXTERNAL
REFERENCE
4.7µF 100nF
GND
AREFB
100nF
Close to device
(for every pin)
Table 42-2. 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
(1)(2)
and 4.7μF
(1)
External reference from AREFx pin on
the analog port
GND Ground
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.
SAM D21 Family
Schematic Checklist
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 1165