51.3 External Analog Reference Connections

The following schematic checklist is only necessary if the application is using one or more of the external analog references. If the internal references are used instead, the circuits in the following two figures are not necessary.

Figure 51-3. External Analog Reference Schematic With Two References

Figure 51-4. External Analog Reference Schematic With One Reference

Table 51-2. External Analog Reference Connections
Signal Name	Recommended Pin Connection	Description
VREFx	1.0V to (V_DDANA - 0.6V) for ADC  1.0V to (V_DDANA - 0.15V) for DAC Decoupling/filtering capacitors 100nF⁽¹⁾⁽²⁾ and 4.7µF⁽¹⁾	External reference VREFx for the analog port
GND		Ground

1. These values are only given as a typical example.

2. Decoupling capacitor should be placed close to the device for each supply pin pair in the signal group.