[sdiy] Driving SSI2144 freq control with PWM from a microcontroller

[René Schmitz]

On 05.11.2022 16:04, Eric Brombaugh via Synth-diy wrote:
> There's a way to mitigate that - ensure that you always have a high 
> and low transition in every cycle. Basically you create a very high 
> frequency PWM signal that's either 33% or 67% depending on the state 
> of your PDM bit, so the speed of the high & low transitions are always 
> part of your output and don't vary with the data value. Downside is 
> that your PDM bitrate has to be 1/3 of that you'd get without doing 
> this approach.

If I understand correctly, you also loose 2/3 of the output range. And 
assumes the t_on and t_off are the same.

-- 

synth at schmitzbits.de
http://schmitzbits.de