Electronics > Beginners
Easy-to-use higher frequency clock generator
coaxialgamer:
I'm working on a small project for which I need to generate a clock signal.
I'd typically use a 555 timer, but I need higher frequencies, approaching 10mhz. So that's not going to cut it.
I'm sure there are great options out there for this kind of circuit. However, I'm far from an expert in electronics, and I mostly need something that's easy to use ("programmed" externally, like a 555).
I'd really like to be able to adjust the output frequency, which is why I don't really want to use a simple crystal oscillator.
Jitter isn't too much of a concern, but I do need an LVCMOS output to work with the discrete 74 series chips I'll be using.
What options do I have here?
Again, I'm a noob here, so feel free to point out if I'm ignoring something obvious.
radiolistener:
you can use si5351 synthesizer module. It allows to make up to 3 output frequencies from 2 PLL's. You can setup it with some cheap microcontroller such as STM32F103 blue pill or some arduino. It allows to get any frequency from 5 kHz to 200 MHz
https://www.aliexpress.com/item/32817431908.html
If you needs just fixed 10 MHz, you can use Crystal Oscillator, jut put proper power supply and get 10 MHz output:
https://www.aliexpress.com/item/32949421823.html
coaxialgamer:
Will I need to incorporate this MCU into my actual design, or can I program it once and forget about it?
rdl:
You can make one from a couple of logic gates and a few other parts. Just search for "logic gate oscillator".
Gyro:
--- Quote from: coaxialgamer on August 23, 2019, 06:57:20 pm ---Will I need to incorporate this MCU into my actual design, or can I program it once and forget about it?
--- End quote ---
If you look on ebay, you can also find controllers - eg. pre-programmed Arduinos to to take the hassle out of the user interface.
eg: https://www.ebay.co.uk/itm/VFO-DIY-ARDUINO-PROGRAMMING-CODE-UPLOAD-SI5351-AD9850-AD9851-OTHERS-for-Hams/183786465985?hash=item2aca86eac1:g:pJQAAOSwEVlcBVnH
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