how to collect two signals from ADS1262EVM

Karl Li

Other Parts Discussed in Thread: ADCPRO, ADS1262, ADS1263, ADS131A02, ADS1257

Hi, I am trying to collect two signals from ads1262evm in the adcpro. but it only allows me to collect the two channels one by one. is there a way to automaticly collecting the two channels data?

Thanks

over 8 years ago

0 Christopher Hall over 8 years ago

TI__Mastermind 44640 points

Hi Karl,

You're asking about "multiplexing" between two channels and displaying the data side-by-side, correct?
...Unfortunately, ADCPro only allows you to setup a single device configuration, then it goes off and collects the data for that configuration. So you can collect the data for each channel independently, but not in a simultaneous or multiplexed order.

We're looking into providing a kind of "scripting" functionality into future EVMs, but right now the only way to do something like this would be to write your own software.

Best Regards,
Chris

0 Karl Li over 8 years ago in reply to Christopher Hall

Prodigy 20 points

Well, I have the ads1262evm connecting to mmb0 mother board. the ads1262evm suppose to have 8 input. I have two inputs and want to collect the two signals to one file. But it looks as what you said, they are not in mux order. I have to collect the first signal and then the second after the first one is complete. also they are not showing in the same graph.

0 Christopher Hall over 8 years ago in reply to Karl Li

TI__Mastermind 44640 points

Hi Karl,

If you're okay with collecting the data channels separately, you could combine the results into a text file and use the "File Reader" plugin to import the data.

The text file should have the following (tab delimited) format:

(The yellow arrows indicate tabs). Here's a text file you can reference and overwrite with your data:

adcpro data.txt

[Device Information]		
EVM Device Name	ADS1262	
Date and Time	8/24/2016	
Notes		
Number of Channels	2	
[Channel Information]		
Channel Name	ADC0	ADC1
Sampling Frequency	8000.000	8000.000
Input Frequency	0.000	0.000
Max Code	2147483647	2147483647
Max Voltage	2.50	2.50
Min Code	-2147483648	-2147483648
Min Voltage	-2.50	-2.50
Data Format	Decimal	Decimal
[Channel Data]		
	9280	2186
	9280	2177
	9540	2079
	9830	2078
	9450	2091
	9540	2053
	9570	1986
	9590	1988
	9500	2006
	9610	2118

After you create the text file you'll need to the following:

Load the File Reader and at least one of the Test plugins
Select the "File Path and Name" of your text file.
Set the "Block size" to the number of points in the text file
Click "Acquire" to import the data.

I hope that helps!
Chris

0 TIguru over 8 years ago in reply to Christopher Hall

Expert 1430 points

Hi Chris,

Our goal is to be able to acquire samples from two channels either simultaneously or with a known fixed delay between channels. Sample rate is between 20ksps and 100ksps, resolution needs to be 22-bits or better.

I noticed that ADCPRO has the option of acquiring data from ADC1 and ADC2 if using ADS1263EVM. Would ADS1263EVM meet the criteria listed above?

In advance, thank you for your response.

0 Christopher Hall over 8 years ago in reply to TIguru

TI__Mastermind 44640 points

Hi Guru,

The ADS1263 has a second 24-bit ADC; however, it only goes up to 800 SPS and has an ENOB of 14 bits...For the ADS1262 or ADS1263, the primary 32-bit ADC can operate at 38.4 kSPS, however, the resolution is only 15 bits at this data rate.

ENOBs for fastest ADC1 and ADC2 data rates:

The noise performance of the ADS1262 really shines at the lower data rates, but for this high of a data rate, you might be better off looking into something like the ADS1257 (19-bit ENOB @ 30kSPS) or the ADS131A02 (two-simultaneously sampling ADCS with ~16-17 bits @ 20 kSPS).

Best Regards,
Chris

0 TIguru over 8 years ago in reply to Christopher Hall

Expert 1430 points

Thank you for the info Chris. It helped a lot.

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how to collect two signals from ADS1262EVM