Maximum PWM frequency for MP6551 to achieve 12-Bits


I wish to use the maximum switching frequency I can with the MP6551. My application requires 12-Bit resolution. How can I determine this frequency?

The minimum pulse the MP6551 can support is about 1us. If you want to achieve 12-bit accuracy (4096 distinct PWM duty cycles) you will need at least a 4096us PWM period. I would round that up to 4200us to cover offset and gain errors. So with a required PWM period of 4200us the maximum frequency the MP6551 can support and achieve 12-bit resolution is 1/4200us or 238Hz.

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