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ADS1282EVM-PDK: data output interpretation

Art Mecina
Genius 16575 points
Part Number: ADS1282EVM-PDK
Other Parts Discussed in Thread: ADS1282, ADCPRO

Hello Guys,

Good day.

Our customer have the following concerns:

"There is no information about the data output from the EVM pro and the ADS1282. I have attached a data file. Please tell me how to equate this data into real volts or normalize the volts between 1.0V and -1.0V.? Can I assume that the value of 1073741823 and the -ve value is the full scale value in decimal ? or what? and that means a voltage reference to 2.5Vref?

What is the formula to take the decimal format data and relate that to Volts. For example a sample of 2433 is what in volts , equally a sample of -1503 is what in - volts?"

new_17.txt 
[Device Information]
EVM Device Name	
Date and Time	17Sep21 17:55 (Eastern Daylight Time)
Notes	
Number of Channels	1
[Channel Information]
Channel Name	CH1
Sampling Frequency	4000.000
Input Frequency	0.000
Max Code	1073741823.000
Max Voltage	2.500
Min Code	-1073741824.000
Min Voltage	-2.500
Data Format	Decimal
[Channel Data]
	-24864
	-19002
	4440
	-3339
	-9147
	7734
	25818
	42174
	41373
	22254
	33924
	12639
	-64782
	-89085
	-91386
	-127071
	-166485
	-204474
	-224841
	-209541
	-245175
	-271194
	-277515
	-267672
	-43440
	85635
	11739
	42369
	71463
	61875
	47889
	21915
	19890
	22971
	24276
	5535
	2235
	9489
	-9342
	-20334
	-31086
	-42381
	-20391
	-29712
	-33954
	48258
	92220
	87384
	113295
	150399
	200496
	233718
	213330
	233265
	270849
	265380
	292590
	131295
	-85335
	-35631
	-19860
	-71280
	-68112
	-53595
	-17091
	-19239
	-27120
	-24039
	-13521
	1371
	-5766
	-1209
	10173
	24444
	42726
	27645
	23073
	45384
	-6915
	-78801
	-85899
	-99930
	-136299
	-173232
	-223974
	-224502
	-217422
	-271842
	-265104
	-284979
	-210366
	40401
	56700
	3240
	68346
	71289
	56115
	30213
	18999
	26484
	20973
	17394
	12453
	10659
	486
	-7062
	-20604
	-43800
	-37431
	-18471
	-31482
	-10560
	61689
	87546
	92424
	123354
	157941
	209160
	228645
	204135
	247515
	268095
	270096
	262674
	38985
	-84936
	-10722
	-47229
	-74940
	-55386
	-40440
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	-7797
	-5847
	-6930
	1170
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	30471
	37581
	14025
	25173
	39018
	-38169
	-83604
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	-120579
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	-193002
	-229344
	-212529
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	-269157
	-261951
	-290337
	-132627
	74634
	26139
	21270
	79098
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	49275
	23796
	19629
	27450
	33858
	13581
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	5631
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	11643
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	79026
	121713
	147849
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	222474
	223743
	224400
	263349
	262239
	284760
	207396
	-31302
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	-7209
	-64242
	-74001
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	-28194
	-19524
	-180
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	13788
	30939
	40146
	36843
	13473
	30729
	18054
	-61575
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	74256
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	-34017
	-32226
	30879
	93174
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	158568
	194796
	226695
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	226848
	270591
	262665
	282378
	143430
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	-162
	13836
	27681
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	31959
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	16296
	72021
	10998
	46719
	73575
	63696
	36201
	22626
	21915
	23766
	19581
	5430
	8970
	1398
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	-20169
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	-38262
	-22002
	72114
	95835
	71850
	146133
	179790
	178620
	236883
	231273
	238440
	265299
	274593
	262161
	60066
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	-36384
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	-24339
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	-4617
	-6786
	-21576
	3546
	15408
	29778
	44730
	20394
	25434
	30438
	-24264
	-84414
	-96987
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	-167880
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	-214767
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	-276690
	-288924
	-147756
	53148
	53628
	25290
	51963
	69231
	57474
	24573
	19815
	26220
	30681
	14094
	2526
	13290
	-1710
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	-20157
	-44577
	-29229
	-18825
	-48744
	4725
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	90828
	148200
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	206991
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	253269
	273459
	282006
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	5271
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	9699
	22110
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	36741
	18993
	39003
	26871
	-57915
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	78276
	35343
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	59841
	63639
	45054
	22371
	24204
	24819
	26394
	12903
	1284
	3336
	-5175
	-16611
	-37092
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	-25602
	-31329
	-38715
	37164
	91026
	80958
	108819
	162981
	187356
	222228
	235128
	231894
	260661
	269199
	283638
	157143
	-55395
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	-25566
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	-21249
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	-7032
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	-8586
	8778
	25104
	41925
	29973
	19266
	45891
	-4461
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	-102057
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	-417
	76428
	20496
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	2856
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	1593
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Also, does TI provide ADCPRO software modifications for the customers?

Thanks and regards,

Art

  • 0
    TI__Genius 16575 points

    In addition to the inquiry above,  What is the effective input impedance of the ADS1282 EVM board?

    Thanks and regards,

    Art

  • 0
    TI__Mastermind 18900 points

    Hello Art,

    What is the formula to take the decimal format data and relate that to Volts?

    We have a blog post on the topic, I'll try my best to supplement that post's understanding with the ADS1282: https://e2e.ti.com/blogs_/archives/b/precisionhub/posts/it-s-in-the-math-how-to-convert-adc-code-to-a-voltage-part-1 

    So, this output has already changed the output from 2's complement binary to decimal. The equation from raw codes to the output would look something like this in excel:

    IF(ISODD(HEX2DEC(<cell>)/2^(30-1)),HEX2DEC(<cell>)-2^30,HEX2DEC(<cell>)). 

    To reference the blog, Equation one has VIN = (output code) * LSB, where getting the output code in decimal makes the math is a bit easier down the line for hand calculations.

    So now we need to get LSB from equations 2 and 3 which are turns our equation into LSB = (m*VREF/PGA)/2^n = (2*(2.5)/PGA)/2^30. Remember, this is a bidirectional input so the m = 2, and we have 30 bits of data because the MSB of the 31 bit ADC packet is reserved for the sign. I don't have your gain so I can't fill that in.

    A short hand explanation for the process is: looking at the code, understanding what percentage this code is compared to the max code, and then multiplying percentage by the max possible (negative or positive) voltage we can read.

    The datasheet tries to illustrate this process (including the 2's complement step) using this table below. If you squint hard enough, you can see FSR and the two complement process.

    In addition, the Analog Engineers calculator: https://www.ti.com/tool/ANALOG-ENGINEER-CALC  can take your data and analyze it for you. Using the load ADC Data button, you can throw that in the calculator and get some interesting metrics about your data. Notice how it also depends on your sample rate and LSB size.

    Unfortunately, the tool can't take the data as is, use the help button to see what format the data needs to be in. But if you delete all of the stuff at the top and leave your raw codes, then it should work. Refer to the help button documentation if it does not.

    What is the effective input impedance of the ADS1282 EVM board?

    Well, you have the schematic in the user guide, depending on which input channel you're using, and the datasheet section below has the equation for the ADC's input impedance, which depends on your sample rate. You should be able to get a nice SPICE simulation environment for it.

    Does TI provide ADCPRO software modifications for the customers?

    Unfortunately, the code you see in the ADCPRO download is what you get. The scope of the software is evaluating performance and everything provided does a good job of doing that so there's no modifications needed.

    Best,

    -Cole

  • 0 in reply to Cole Macias
    TI__Genius 16575 points

    Thanks for the detailed response Cole.

    Below are the feedback from the customer:

    Given this set,
    What is the voltage for the channel data decimal value given below?
    This is for the ADS1282
    Number of Channels 1
    [Channel Information]

    Channel Name CH1
    Sampling Frequency 1000.000
    Input Frequency 0.000
    Max Code 1073741823.000
    Max Voltage 2.500
    Min Code -1073741824.000
    Min Voltage -2.500
    Data Format Decimal
    [Channel Data]
    8778
    8466
    9906
    6798
    8058
    11178
    9942
    9801
    9615
    10851
    8601
    7545
    10587
    9246

    Thanks and regards,

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 18900 points

    Hello Art,

    To reiterate above:

    VIN = (output code) * LSB, where 8778, 8466, etc = output.

    LSB = (m*VREF/PGA)/2^n = (2*(2.5)/PGA)/2^30, where PGA is the gain. Which I already asked for, and was not provided to complete the equation.

    Best,

    -Cole

  • 0 in reply to Cole Macias
    TI__Genius 16575 points

    Thanks Cole.

    I reminded customer about the PGA request. He understood it now but has some follow-up inquiries.

    Is it better if he runs the ads1282 at a gain of 1 as opposed to any other ?To him a device that has gain is generally more noisy and since he is trying to minimize any system noise, he thinks a gain of 1 is the answer?

    It is interesting that the device has a gain of up to 64. Just curious, is that part of the seismic A to D requirements?

    Thanks and regards,

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 18900 points

    Hello Art,

    Between equation 1 in the datasheet and table 1, you can solve for input referred noise (or the N_RMS term) by substituting the FSR_RMS (which is given) and the SNR value (which comes from the table). You can build an excel and verify my results if you'd like. I've also provided Effective resolution as well.

    As you can see, low gain does give bad noise but high data rate does as well (which makes sense from an OSR perspective). Depending on the data rate, low gain can give better performance than higher gains with higher data rates.

    Yes, the gain of 64 is in the realm of possibility for the seismic ADC requirements. As the chart shows, it will trend towards the best noise performance so if your signal of interest falls into the full scale range (such as far away reflections) it is the best setting to use.

    Best,

    -Cole