LM97937EVM: General questions on LM97937EVM

ahmed eltayeb ahmed elbushra

Prodigy 20 points

Part Number: LM97937EVM
Other Parts Discussed in Thread: ADC16DX370EVM, ADC16DX370, LMK04828, USB2ANY

hello I have a few questions about LM97937EVM board :

Is this board available
Can it work with KCU105
Can it work on Windows and Linux or there is restriction
How to change the SPS and what is the resolution

regards

ahmed

over 3 years ago

+1 Kang Hsia over 3 years ago

TI__Guru* 78404 points

Hi,

1. yes, the board is available for purchase on TI Estore

https://www.ti.com/tool/LM97937EVM

2. Yes it can. See reference design below

https://www.ti.com/tool/TSW14J10EVM

For 3 and 4, please refer to EVM user's guide

https://www.ti.com/lit/ug/slau542/slau542.pdf?ts=1635858399040&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FLM97937EVM

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

I found your board ADC16DX370EVM on Xilinx website referencing that is combatable with kcu105 and ZC706 is it possible to use it without the need for TSW14J10EVM Data Converter Evaluation Module board.

+1 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Hi Ahmed,

Yes, it is possible. You will need to utilize the KCU105/ZC706 EVM schematic + ADC16DX370EVM schematic and cross check FMC connection between the two boards

The schematic for the ADC16DX370 can be found:

https://www.ti.com/tool/ADC16DX370EVM

You can download the Xilinx FPGA EVM respectively on Xilinx website.

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

is there any guide on how to use kcu105+ADC16DX370EVM ?
is possible to use the LMK04828 as sampling frequency clock instead of any external clock source ?

0 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Hi,

1. We currently do not have any user's guide for the interconnect of the two boards.

2. yes, the user's guide on the ADC16DX370EVM talks about configuring the LMK04828 as clock source

-Kang

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

I looked in the user's guide then I can configure the board to use the LMK04828 as ADC sampling clock.
The guide provides only 'LMK04828_config2.cfg' file to set LMK04828 to 368.64 MSPS,

there is no guide on how to configure the sampling clock to less than that, even though I read LMK04828 datasheet I didn't know how to set up the sampling frequency to different sampling ranges. any advice.

-Ahmed

0 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Ahmed,

There are clock dividers to divide down the internal LMK04828 VCO to different rates. You can refer to the LMK04828 EVM and user's guide for guideline on the adjustments of the clock rate.

-Kang

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

Kang,

I have read the guide lines for LMK04828 EVM and found out that to configure our ADC16DX370EVM's LMK084828 we need to use USB2ANY Texas Instruments device + using code loader program, all I am trying to do is configure file 'LMK04828_config2.cfg' to a lower sampling frequency.

my questions are :

how can I generate a .cfg file from code loader program without the need to load to program directly to it ?

in .'LMK04828_config2.cfg' button it says hardware configurations required , do you mean these hardware configurations ?

Ahmed

+1 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Hi Ahmed,

The ADC EVM itself can program the LMK04828 directly. It does not need the additional USB2ANY programmer.

To generate your own .cfg file, you will need to go to LMK04828 page to understand the device, and the configure the device through the TICPRO software

https://www.ti.com/tool/TICSPRO-SW

-Kang

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

Hi kang,

I did read LMK04828 Datasheet to understand the registers and I have copied the registers value on 'LMK04828_config2.cfg' to TICPRO software raw register windows to see the effect on LMK04828 block diagram value on the software, it used the internal VCO 1 to generate 2949.12 MHz the divided it with clock divider value of 8 to get 368.64Mhz sampling frequency. my question is:

I tried to set the sampling frequency to the minimum possible value by dividing with 32 divider and I realized that the minimum I can get is 92.13MHz from VCO1 and 76.8 MHz from VCO0 ? how can I get a lower sampling frequency knowing that my ADC16DX370 can go to as low as 50MHZ?

Regards

Ahmed

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to ahmed eltayeb ahmed elbushra

Prodigy 20 points

I got one more question:

what kind of EVM Hardware modification required ?

Ahmed

0 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Hi Ahmed,

you will probably need additional divider (discrete, separate clocking divider circuit) to do the additional divide for you. The clocking team can help you best.

0 Kang Hsia over 3 years ago in reply to ahmed eltayeb ahmed elbushra

TI__Guru* 78404 points

Hi Ahmed,

This should be described in the user's guide. See the schematics of the EVM for different EVM modifications on the clocking path to install and remove resistor options for the clock path.

0 ahmed eltayeb ahmed elbushra over 3 years ago in reply to Kang Hsia

Prodigy 20 points

Hi kang

Isn't there suppose to be an another N-divider within the ADC16DX370, that divide the CLKIN that is received from LMK04828, in the ADC16DX370EVM.