3 Phase PDM generators

One of my customers has used in the past the ADSP BF538 that has a 3 phase PDM generator.

In an effort to reduce cost for a lighter version, they are looking at the BF512 and need to generate two modulated PDM singanls.

He is thinking to use the timer outputs. Here is the question:

As the BF512 has a 3 phase PWM, I was wondering if each PDM channel, in the #3phase unit, could be run and modulated separately?


  • 0
    •  Analog Employees 
    on Jun 19, 2012 11:15 PM


    Yes in BF51x PWM module the three PWM channel pairs can be modulated separately. There are three duty-cycle control registers (PWM_CHA, PWM_CHB, and PWM_CHC) that directly control the duty cycles of the three pairs of PWM signals. Also each of the six PWM output signals can be enabled or disabled via separate output enable bits of the PWM_SEG register.