3.4.1 DAC Output

Clarifications of the block diagram and the DAC Output sub-section of the DAC peripheral has been made:
  1. The block diagram is updated with clarifications to the output signal routing (buffered/unbuffered) and will replace the original block diagram.
  2. Sections 34.3.2.3 (DAC as Source For Internal Peripherals) and 34.3.2.4 (DAC Output on Pin) are replaced by section 34.3.2.3 DAC Output.

Figure 34-1. DAC Block Diagram

34.3.2.3 DAC Output

The DAC can be used as an output to a pin and as an input to the peripherals in the table below.
DAC Output Peripheral Input Notes
Unbuffered
  • Analog Comparator (AC)
  • Analog to Digital Converter (ADC)
 The peripheral is connected to the unbuffered DAC output. See section 34.3.2.3.1. Unbuffered Output as Source For Internal Peripherals.
Buffered
  • Analog Signal Conditioning (OPAMP)
 The peripheral is connected to the DAC Output pin. See section 34.3.2.3.2. Buffered Output.

34.3.2.3.1 Unbuffered Output as Source For Internal Peripherals

The unbuffered analog output of the DAC can be internally connected to other peripherals when the ENABLE bit in the Control A (DACn.CTRLA) register is written to ‘1’. When only the DAC unbuffered analog output is used, the Output Buffer Enable (OUTEN) bit in DACn.CTRLA can be ‘0’, freeing the pin to be used by other peripherals.

34.3.2.3.2 Buffered Output

The buffered analog output of the DAC can be enabled by writing a ‘1’ to the Output Buffer Enable (OUTEN) bit in the Control A (DACn.CTRLA) register. The pin used by the DAC must have the input disabled from the Port peripheral. Refer to the Electrical Characteristics section for information about the drive capabilities of the DAC output buffer.