DELTASIGMAEVAL-GUI: ADS124s08

Prodigy 50 points

Sushmita Chaudhary

Replies: 6

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Part Number: DELTASIGMAEVAL-GUI

Hello,

I have connected a thermocouple (K-type) using J7 junction to ADS124s08 EVM board and using Delta Sigma Evaluation Software. But when I clicked on Data Analysis in the GUI,I am not able to get any data after clicking the Collect Data button. What is the problem in the above situation? Please help me through it.

Genius 10300 points

Alexander Smith
- Feb 11, 2019 3:22 PM
Hi Sushmita,

Thanks for your post and welcome to the forum!

There could be a couple of issues here - so the more data you can provide the better we will be able to help.
Can you post a screenshot of the GUI when this error occurs?
Are all of the jumpers in their default positions on the board?

Best regards,

Alex Smith
Applications Engineer | Precision Delta-Sigma Converters

Check out our helpful resources:
TI Precision Data Converters | TI Precision Labs - ADCs | Analog Engineer's Calculator | Data Converters Learning Center | Selection Guide
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Prodigy 50 points

Sushmita Chaudhary
- Feb 12, 2019 10:42 AM
In reply to Alexander Smith:

Hi Alexander,

Thanks for your time to resolve my problem. Issue is resolved, actually there was some connectivity problem in thermocouple at J7. Now I am able to see the data of the thermocouple. One thing I have to ask, the output voltage of the thermocouple should be,

(2*Vref*Code)/(2(pow,24) *gain) (excluding the cold junction temperature voltage)

Does here the Code means the decimal form of the input values(say 1 to 'N' no of samples)?

Regards

Sushmita Chaudhary
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Genius 10300 points

Alexander Smith
- Feb 12, 2019 3:39 PM
In reply to Sushmita Chaudhary:
Hi Sushmita,

Glad to hear that your original issue is resolved!

Code means the output value from the ADC that corresponds to the magnitude of the input signal with respect to the reference. Take a look at section 9.5.2 Data Format in the datasheet.

Best regards,

Alex Smith
Applications Engineer | Precision Delta-Sigma Converters

Check out our helpful resources:
TI Precision Data Converters | TI Precision Labs - ADCs | Analog Engineer's Calculator | Data Converters Learning Center | Selection Guide
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Sushmita Chaudhary
- Feb 12, 2019 4:38 PM
In reply to Alexander Smith:
Hi Alexander,
Thanks for the information. I will read section 9.5.2 as you suggested and if any query will come, I will ask you again.

Best Regards
Sushmita Chaudhary
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Joseph Wu
- Feb 12, 2019 4:45 PM
In reply to Sushmita Chaudhary:
Sushmita,

In case you were looking for other application notes for guidance, there is an application note on measuring thermocouples with ADCs that you can find on the TI website. I've added a link here:

www.ti.com/.../sbaa274.pdf

Joseph Wu
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Sushmita Chaudhary
- Feb 12, 2019 4:51 PM
In reply to Joseph Wu:
Hi Joseph,
Thank you for the link you provided. I will go through that pdf.

Regards
Sushmita Chaudhary
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DELTASIGMAEVAL-GUI: ADS124s08

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