AD9850 DDS code

[iw2fvo]

Hi Henrik,
I will like to understand what are OUTPUT_1 and OUTPUT_2 : any help? Sine or square ?
What about the other two outputs ?
What is the purpose of R_13 Trim ?

I do not have any schematics for this board nor manual to read ! My board is exactly the one shown in your photo.

Thanks again for the great help .
Bye
Ambrogio
IW2FVO

[HenrikOlsson]

Hi,
Not sure, I don't know much about the hardware I'm afraid. I wrote the code and put the board on the shelf.... I'd look at the AD9850 datasheet for details.
I think both outputs are Sine outputs, the phase relationship between the two outputs is what you set with CONTROL word.

/Henrik.

[mark_s]

Here's a schematic for the above module

As I recall the pot will change the duty cycle on the square wave
and will skew the sine wave

[iw2fvo]

Henrik and Mark_s,
thanks for the assistance.
regards,
Ambrogio
IW2FVO

[sean-h]

I will like to understand what are OUTPUT_1 and OUTPUT_2 : any help? Sine or square ?
What about the other two outputs ?
What is the purpose of R_13 Trim ?

The module has two outputs for Sine Wave and two outputs for Square wave.

In Henriks handy pin-out picture he shows the two sine waves outputs, the next two pins above are the square wave outputs.

Played with a module today and the code examples Henrik supplied work great and thank you Henrik.

The Pic Chips tend to max out at 25khz when pulsing stepper drivers which retricts the speed when running them at say 2000 pulses per revolution. It limits you to a max of around 500 RPM.

Now with the DDS boards + Pic Chip combination, I had some stepper motors here today hitting over 5000 RPM no problems at all.

Great little modules and good prices.

Cheers

Sean.

[iw2fvo]

Sean,
could I have the circuit diagram for your stepper motor implementation ?
Thanks
Ambrogio