Hello everyone,
My name is Jimmy. I’m new here. Nice to meet you all.
Here is a question for you:
I need to produce a Square wave 12 MHz - 15 MHz, with adjustable duty cycle.
Can the AD9850 be forced to produce a square wave in this range?
The AD9850 chip generates a DDS-sinewave. Which is a approximated analog sinewave but contains high frequency noise due to the digital creation proces. Most of those cheap AD9850 boards [(No suggestion to buy. Just an example) contain a filter to clean that up and result in a reasonable pure sinewave. Those can also output a square wave but that is actually generated by a comparator with the sinewave as input. And it doesn’t support the full bandwith range as the analog output bandwith. The specs I’ve seen suggest it is limited to 1 MHz.
So no, not a square wave 12-15 Mhz. And certainly not adjustable duty-cycle, which is the same as PWM.
If you need 12 to 15 MHz square-waves (fixed duty-cycle) then there are crystal oscillator or resonator cans made for that. See an older thread for similarity and suggestions:
https://forum.sparkfun.com/viewtopic.php?f=14&t=27767](http://www.ebay.com/itm/1pcs-IC-AD9850-DDS-Signal-Generator-Module-0-40MHz-Test-Equipment-TE439-/371866797343?_trksid=p2349526.m2548.l4275)
Thank you Valen for your informative reply.
Do you know of, or can you suggest a ready made device that can be controlled with an Arduino (or a small stand alone device that is not Arduino controlled), that will produce 12 MHz - 15 MHz square wave? – regardless of duty cycle capabilities.
Jimmy
No, I do not. You’ll have to search for examples yourself.