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Part Number: TSW1406EVM
I plan to use the DAC3482 (2 channels, 1.25 GHz. DAC) for my project. I plan to evaluate it using the TSW1406 board which has 64K samples memory.
Before I purchase them, I got few questions:
1. Is there a DAC3482 or a DAC3484 chip in the DAC3482 evaluation board? The design files show DAC3484.
2. I would like to download 2 arbitrary signals into the 64K memory of the TSW1406 and output them periodically (after the buffer end, it returns to the first sample and so on). Is it possible?
3. I would like to get those 2 signals at 2 of the outputs without any mixing between them (or any other operation between those 2 signals) at X4 interpolation. Is it possible?
I checked the datasheet and I saw that the coarse mixer can be disabled. However, I'm not sure if when the mixer is disabled, I can still do X4 interpolation?
( I noticed that the coarde mixer (CMIX) can be disabled but I cannot see how FMIX can be disabled?)
4. Is it possible to disable the NCO (Numerically Controlled Oscillators)?
I would appreciate your fast response. I must make a decision within 2 days.
Hello Jim,
We are using those boards without extgernal clock. The jumper JP5 is with pins 2 and 3 shorted. We also selected it in the DAC3482 software.
We download a file with sine wave on one channel and DC on the other one. We connected the 2 outputs J6 and J3 directly to an oscilloscope.
We expect to see a sine wave on one channel and nothing on the other channel.
We operate the boards as follows:
1. Connect the DAC 3482 and the TSW1406 boards to USB. DAC board is connected to +6V supply as well.
2. In the DAC software we select DAC3482 on the top (black bar).
3. Then we do "Load regs" with the default file (DAC3482_FDAC_1228p8MHz_4xint_NCO_30MHz_QMCon - attached).
4. Now we change to external clock (Control -> Manual_PRI_IN we change to Manual_SEC_IN).
5. We do "Send All"
On hte TSW1406 software we do "DAC" and then select DAC3482 (on the left)
Then we download the attached CSV file. On "Data rate" we put 307.2 Mhz (we tried lower frequencies - nothing works)
and then we do SEND.
I attach all of the pictures of all screens + files + board picture (please check if jumpers are set correctly).
The CSV file was changed to TXT
Thanks for your help,
Avi
Hello,
I'm sorry fo rthe delay in my response, we were on Passover holiday + som urgent matters.
We tried your file with AD3482 software. Same file as you sent + followed your instructions. We got some weired combination of few sine waves:
However, if we do the same with DAC3484 software we get the sine waves:
As you may see nice sine waves of 50 MHz.
However, if we press this check box once again:
We get 2 sine combined waves:
So now we all understand that the hardware works but we also understand that we don't know how to operate it...
Why it does not work with DAC3482 software?
Why it is changing the waveform after we click this checkbox in DAC 3484 software?
We need to know the exact way of operating the DAC3482 boars + exact initialization because we cannot use the evaluation board fo rour project. We have to send exact parameters from FPGA.
I would appreciate your detailed answer.
