Modulating Frequency of Clock Signal

[MarshallPlexi]

Hello All! This is my first time posting here but I've been a member for a while.

I'm working on a new project that needs a clock signal (24kHz - 400kHz total range) that will vary +25% / -25% with an applied sine wave. I would use a CD4046 since I can set the clock frequency with the RC combinations and then modulate that clock frequency but I'd prefer to send the clock signal with a Si5351 so my clock can be dead nuts on frequency.

It sounds like dead stock FM modulation to me.

I've spent the night on Google searching for an IC that will modulate a pre-existing clock frequency but all I can find are PLL examples using 555 timers and the like.

Does anyone have a direction I could start looking in for this?

Thanks so much for your time!

[TheMG]

Sounds like the sort of thing a DSP would be well suited for.

It's going to be quite hard to achieve with discrete circuitry if you need any kind of accuracy, especially over the frequency range you're looking at.