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Explorer
Explorer
1,521 Views
Registered: ‎09-05-2015

ZCU111 DAC/ADC how to use?

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Hi, 

 

I am interested in purchasing Zynq UltraScale+ RFSoC ZCU111 Evaluation Kit (https://www.xilinx.com/products/boards-and-kits/zcu111.html#overview) and I have few questions.

 

xm500.PNG

 

The figure above is from UG1271's appendix 4. Somehow four DACs and ADCs are differentials while four DACs and ADCs are single-ended. Can anyone tell me what the difference is?

UG1271 says "Two channels ADC Low frequency baluns with -3dB attenuators to SMAs." I don't understand what this means. What should I be worried about using these channels compared to other four normal differential ADC channels?

 

Thanks,

DJ

 

 

 

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1 Solution

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Moderator
Moderator
1,315 Views
Registered: ‎08-08-2017

Re: ZCU111 DAC/ADC how to use?

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Hi @moon5756 

Yes. for x8 you need to make your own custom  daughter card similar to XM500

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9 Replies
Observer sulemanzp
Observer
1,500 Views
Registered: ‎03-12-2017

Re: ZCU111 DAC/ADC how to use?

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As per my understanding.

Two ADCs of Tile 0 are single ended and contains 0-1 GHz Balun.

You can apply signal between DC to 1GHz frequency for ADC testing on those channels. Single ended means you can directly connect RF Signal Source with these ADC via SMA to SMA cable. Also there is no termination on board, so if your source output 50 Ohm terminated signal then you should apply 50 Ohm termination before applying signal.

Two ADCs of Tile 1 are single ended and contains 1-4 GHz Balun.

You can apply signal between 1 to 4GHz frequency for ADC testing on those channels. These channels apply same configuration as above Tile 0.

Four ADCs of Tile 2 and Tile 3 are differential. 

These channels are directly connected to the ADC pins of FPGA. This gives freedom of testing with custom hardware e.g. 400Mhz - 3 Ghz balun in my case. No attenuation. 

Four DACs of Tile 1 are single ended.

Similarly single ended ADCs, two DACs should be used to generate frequency between 0-1 Ghz and two DACs for 1-4 GHz.

Four DACs of Tile 0 are differential. 

These channels are directly connected to the DAC pins of FPGA. You can attatch any hardware which requires differential input. Similar to differential ADC. 

Explorer
Explorer
1,491 Views
Registered: ‎09-05-2015

Re: ZCU111 DAC/ADC how to use?

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Thanks for the reply @sulemanzp 

I want to create 8x8 system with  to ZCU111. But based on what you stated, is it not possible to create 8 DAC system with the same bandwidth(let's say 2GHz)? because those two single ended DACs cover only 0-1Ghz.

I have a least understanding in analog, so let me know if I understand something totally wrong.

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Observer sulemanzp
Observer
1,483 Views
Registered: ‎03-12-2017

Re: ZCU111 DAC/ADC how to use?

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@moon5756 I am also not good in analog. If you ask my opinion then yes its not possible with XM500 board. I think you need custom board or mod for that two DACs.

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Moderator
Moderator
1,415 Views
Registered: ‎09-15-2016

Re: ZCU111 DAC/ADC how to use?

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Hi @moon5756 

>> Somehow four DACs and ADCs are differentials while four DACs and ADCs are single-ended. Can anyone tell me what the difference is?

I am not sure about your statement but please see the screenshot below which shows RFOSC device' s ADC DAC banks mapping to ADC DAC tiles. 

RFSOC.JPG

Regards
Rohit
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Explorer
Explorer
1,357 Views
Registered: ‎09-05-2015

Re: ZCU111 DAC/ADC how to use?

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@thakurr 

Thanks for the reply. Is it possible to create 8x8 system with two ZCU111 (let's say 2GHz bandwidth), or do I need something else to take into account?

I don't fully understand what below statement in ug1271 means, but it seems like four DACs/ADCs need some special treatment?

 

• Two DACs and two ADCs routed to HF baluns with –1dB Pi pad attenuators and then to SMAs

• Two DACs and two ADCs routed to LF baluns with –3dB Pi pad attenuators and then to SMAs

• Four DACs and four ADCs routed to SMAs for use with external custom baluns and filters

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Moderator
Moderator
1,341 Views
Registered: ‎08-08-2017

Re: ZCU111 DAC/ADC how to use?

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Hi @moon5756 

To evaluate the full bandwidth performace , some ADCs and DACs as mentioned in UG1271 are routed to

SMA connector via HF (High frequency ) baluns and Low frequency baluns respectively .

ADCs and DACs routed through Low frequency baluns paths are intended for signal upto 1 Ghz and High frequency baluns paths are intended from 1Ghz to 4 Ghz.

 

 

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Explorer
Explorer
1,325 Views
Registered: ‎09-05-2015

Re: ZCU111 DAC/ADC how to use?

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@pthakare 

I see, thanks a lot. One last question. So if I want to construct 2GHz MIMO system, is the maximum the number of channels I can get 6? because two low frequency baluns are bounded up to 1 GHz?

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Moderator
Moderator
1,316 Views
Registered: ‎08-08-2017

Re: ZCU111 DAC/ADC how to use?

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Hi @moon5756 

Yes. for x8 you need to make your own custom  daughter card similar to XM500

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Visitor sungh
Visitor
724 Views
Registered: ‎07-05-2019

Re: ZCU111 DAC/ADC how to use?

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• Two DACs and two ADCs routed to HF baluns with –1dB Pi pad attenuators and then to SMAs

• Two DACs and two ADCs routed to LF baluns with –3dB Pi pad attenuators and then to SMAs

• Four DACs and four ADCs routed to SMAs for use with external custom baluns and filters

i want to use 4x4, that is 4 ADCs, 4 DACs. 2GHz. According to what you have said, i can use " Four DACs and four ADCs routed to SMAs for use with external custom baluns and filters", right? But i need to have my own baluns and filters?

 

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