ADS9218: ADS9218 SNR difference between the datasheet and simulation

something need to be correct, the simulation SNR equals to 129

Hi Eric,

Thanks for your question! I will look into the model function and get back to you. In the mean time, could you please share what the purpose of this simulation is? If you have the ADS9218 device or EVM, the SNR measurements can be taken in real time. I can share some screenshots as well if you are unable to take the measurements. 

Best,

Samiha

Hi Eric,

Here are some AC performance screenshots from the ADS9219 (similar specs) device.

Best,

Samiha

Hi  Sharif,

I do such a simulation because of i'm  working in the SEM and I need to promote some reference design for our customer, and this devices was promoted by PADC team ,so i use this for simulation ,I need to ensure the datasheet& simulation & EVM test results the same, but in my simulation ,the ads9224 SNR had so big difference ,so I need work it out.

Hi ,

did this results com from the simulation in TINA or Pspice?

Hi Eric,

The result I shared comes from the actual EVM. So this is real-time data.

So, if I understand correctly, the PSPICE model for ADS9224R is working correctly but the TINA result is not? Could you please use the PSPICE model for now while I investigate the TINA model?

Could you also please share your TINA and PSPICE files? It will help me figure out what may be wrong with the model.

Best,

Samiha

Hi Samiha,

Thanks for your support 

Actually . you can see the former picture i uploaded, i used the Tina to simulate the ADS921X SNR snd then compared to the datasheet , the SNR got in Tina seems better than the datasheet, so i confused about this. can you do the SNR test by TINA and share the simulation file . i want to know how you done the SNR test of the ADS921X

BTW, the best solution is if you can provide the simulation files of how to test the ADS921X SNR, this will help me to have a better understanding on this , i want to know if i did something wrong in the simulation progress

Thanks.

Eric

Hi Eric,

Thanks for sharing. The ADS921x TINA model may be outdated. I am working with the team to update it. Please allow me a day or two to do this. Let's continue this conversation in our email thread. I will close this E2E post. Thanks.

Best,

Samiha