46.4 External Analog Reference Connections

The following schematic checklist is only necessary if the application is using the external analog reference. If the internal reference is used instead, the following circuits are not necessary.

Figure 46-3. External Analog Reference Schematic With Two References
Figure 46-4. External Analog Reference Schematic With One Reference
Table 46-2. External Analog Reference Connections
Signal Name Recommended Pin Connection Description
VREFx 2.4V to VDDANA - 0.6V for ADC (2)

2.4V to VDDANA - 0.6V for DAC (2)

Decoupling/filtering capacitors: 100nF(1,2,3) and 4.7µF(1)

 External reference from VREFx pin on the analog port.
GND Ground
Note:
  1. Refer to Power Supply Electrical Specifications from the Electrical Characteristics chapter.
  2. Refer to the Electrical Characteristics chapter for the intended peripheral to be used with VREFx to determine suggested operational conditions. These peripherals include ADC, DAC, AC, and SDADC.
  3. Decoupling capacitor must be placed close to the device for each supply pin pair in the signal group.