PCIe-6321 and PXIe-6321 devices that support analog output have either two or four AO channels. AO channels are controlled by a single clock and are capable of waveform generation.

The following figure shows the analog output circuitry of PCIe-6321 and PXIe-6321 devices.

Figure 19. X Series Analog Output Circuitry for PCIe-6321 and PXIe-6321 Devices


The main blocks featured in the PCIe-6321 and PXIe-6321 analog output circuitry are as follows:

  • DACs—Digital-to-analog converters (DACs) convert digital codes to analog voltages.
  • AO FIFO—The AO FIFO enables analog output waveform generation. It is a first-in-first-out (FIFO) memory buffer between the computer and the DACs. It allows you to download the points of a waveform to your X Series device without host computer interaction.
  • AO Sample Clock—The AO Sample Clock signal reads a sample from the DAC FIFO and generates the AO voltage.
  • AO Reference Selection—The AO reference selection signal allows you to change the range of the analog outputs.