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

[Ashlyn Black]

I imagine that high frequency content outside the audible range would 
chew up the bandwidth of the device and its processing/generation of 
frequencies inside the audible range?

On 7/11/22 19:52, Neil Johnson via Synth-diy wrote:
> Hi all,
>
> Genuinely curious question: since you're driving a low-pass filter
> anyway, why not dispense with filtering the PWM and, assuming the PWM
> clock is way above audio, just drive the frequency control pin
> directly?  You'll be driving the transistor ladder directly from PWM
> so it would behave more as a switched-capacitor filter rather than in
> linear mode, but it might work.
> For the SSI2144 that would be, say, +/- 90mV pulse waveform.
>
> Neil
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