Re: AD9850/51 module pc boards

K5ESS
 

Does anyone have a reliable Ebay (or otherwise) source of AD9850 and/or AD9851 chips? Ebay has some advertised as low as $9.50 for 9850 chips but I have no experience with any of the suppliers listed. New chips from Mouser are almost expensive as the complete modules from China.
Mike
K5ESS

-----Original Message-----
From: PHSNA@groups.io [mailto:PHSNA@groups.io] On Behalf Of Terry VK5TM
Sent: Friday, September 28, 2018 9:10 PM
To: PHSNA@groups.io
Subject: Re: [PHSNA] AD9850/51 module pc boards

Here is a preliminary 3 pics of the pcb, combined top and bottom layers, top only and bottom only.
Nothing is set in concrete, so changes can be made. The other style module version could also be done.

Couple of points to note:
Obvious one is there is no on-board filter.
The output is through a 1:1 transformer (Coilcraft), this can be changed, but the transformer gives a better output signal both level wise and harmonic suppression wise.
There are some either/or components depending on whether the square wave output is required, these will be explained fully if this goes any further than just an idea.
Most smd components are 0805 sized rather than the smaller size on the current modules.

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