1 Description

The PWM DAC subsystem example demonstrates how to use an MSPM0 timer, and a simple RC filter to create a PWM DAC. The example software creates a 10-bit DAC with a PWM frequency of 31250Hz. The duty cycle of the PWM signal updates continuously to create a sinusoidal waveform at the filter output. While the MSPM0Gx50x devices include a 12-bit DAC, and the internal comparators include 8-bit reference DACs that can buffered through the OPA, a PWM DAC allows for the generation of analog output voltages on devices lacking these peripherals, or just for additional DAC outputs whenever needed. Figure 1-1 shows the block diagram for a single PWM DAC.

Figure 1-1 Subsystem Functional Block Diagram