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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!
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_Sync_:
The DAC they are using is an Analog Devices TXDAC AD9747BCPZ.

They did not rub the numbers off mine well enough ;)

Edit: Just had some look around it with my thermal camera, the Vreg for the CPU circuitry needs rework, it runs blazingly hot as shown in the pictures.
I guess it will be a bit better with the case on and the airflow actually working but that is not a good design right there.
fremen67:
As my MSO i running again, I took some pictures of a 2V sine waveform from 5 to 100Mhz and of a 2V square waveform from 10 to 40Mhz. The AWG is directly connected to my MSO with coax.

You will see that the amp of the sine is decreasing after 30Mhz
The results of the square are logical with a constant rise time / fall time of about 7ns
idpromnut:
Fantastic fremen67!  I grabbed a few screen captures as well after seeing yours. I was a little worried that I had screwed up the fall off, but I think you may have been running into a limitation of your scope for at least the sine wave past 30MHz or so.

All measurements were made at 2Vpp, vertical scale @ 500mV/div. I adjusted the sweep speed to get a good image of the waveform so you can see distortion (if any). I also used my Rb standard as the external clock source for the HDG2002.

One thing of note is the "noisy" sine as one approaches 100MHz. Actually, I was seeing glitches and noise in the sine signal after about 30-40MHz, so perhaps there is something to do with the filtering that is removing this below that frequency range. I didn't notice this behavior with the other function types.
_Sync_:
Yeah I also noticed the glitching with fast sines, I wonder what that is about...

Did you also look at the noise mode? From what I have measured it does not look that random at all...
idpromnut:

--- Quote from: _Sync_ on May 18, 2014, 09:30:46 am ---Yeah I also noticed the glitching with fast sines, I wonder what that is about...

Did you also look at the noise mode? From what I have measured it does not look that random at all...

--- End quote ---

I didn't look at the noise too closely yet.

I also wonder if some of the answers are in the datasheet for the dac. Will have a look at that later today.
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