47.3 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 following two circuits are not necessary.

Figure 47-4. External Analog Reference Schematic With Two References

Figure 47-5. External Analog Reference Schematic With One Reference

Table 47-2. External Analog Reference Connections
Signal Name	Recommended Pin Connection	Description
V_REFA/V_REFB	1.0V to (V_DDANA - 0.6V) for ADC   Decoupling capacitors  100nF⁽¹⁾⁽²⁾ and 4.7µF⁽¹⁾	External reference V_REFA/V_REFBfor 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.