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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
-20370
-27465
-30177
-19449
-7797
-5847
-6930
1170
14718
30471
37581
14025
25173
39018
-38169
-83604
-84957
-120579
-152934
-193002
-229344
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-233241
-269157
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-290337
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74634
26139
21270
79098
67710
49275
23796
19629
27450
33858
13581
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5631
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11643
68958
79026
121713
147849
174426
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223743
224400
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262239
284760
207396
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13788
30939
40146
36843
13473
30729
18054
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84684
16851
36900
74256
60624
35646
17829
22035
28443
30399
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26874
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30879
93174
105078
114690
158568
194796
226695
219894
226848
270591
262665
282378
143430
-81039
-48246
-17166
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13836
27681
41283
31959
25005
41463
-10611
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16296
72021
10998
46719
73575
63696
36201
22626
21915
23766
19581
5430
8970
1398
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72114
95835
71850
146133
179790
178620
236883
231273
238440
265299
274593
262161
60066
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3546
15408
29778
44730
20394
25434
30438
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53148
53628
25290
51963
69231
57474
24573
19815
26220
30681
14094
2526
13290
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93744
93216
90828
148200
183825
206991
228660
220755
253269
273459
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214404
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36741
18993
39003
26871
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221565
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275283
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75489
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2238
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51435
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70194
50226
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19506
35025
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13380
675
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8088
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90921
106278
150090
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213645
226269
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263826
271563
282951
223224
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993
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36375
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19233
40329
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85485
30936
31719
71064
61749
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22485
28200
27579
9006
8034
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85236
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190371
233793
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230004
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55299
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33873
18960
19899
20976
18936
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10623
6900
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46653
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133134
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63180
48498
17706
66600
66150
51219
27840
19905
26289
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Also, does TI provide ADCPRO software modifications for the customers?

Thanks and regards,

Art

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

Thanks and regards,

Art

• 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

• 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?
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

• 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

• 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

• 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