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Which DAC: I have the digital data on a csv file, I would like to observe the reconstructed analog signal on an oscilloscope?

Other Parts Discussed in Thread: DXP, DAC80508, DAC8568, DAC81408, DAC8718, DAC8728, DAC8560

Hi,

Can someone please suggest a DAC eval board that can be interfaced with PC to reconstruct an analog signal for digital data stored in a CSV/text file to observe on a scope.

Thanks,

 

  • Venkata,

    Though the tool is old and there is sometimes compatibility issue on newer versions of Windows, the DXP tool does offer the capability of importing custom waveforms. Most of our general purpose DAC EVMs are supported by DXP.
  • Hi Kevin,

    Thanks for the reply.
    In DXP, I see that the user file format for DAC waveform file is *.tiwu,*.tiwf . How are they different form csv file?
    How do I convert csv/text file those formats?

    Thanks,
  • Venkata,

    There are some additional headers in those file formats that tell DXP how to behave basically. There is also a "Waveform File Converter" which will import text files with whatever delimiter is used. Typically you can convert from CSV to TXT pretty easily.
  • Hi,

    I am looking for precision DACs with 16-bit resolution and 8 channels and came up with the following list

    DAC80508
    DAC8568
    DAC81408
    DAC8718
    DAC8728

    But, each of those parts has its own EVM software, Can you please let me know if any of the above parts EVM is compatible with DXP?

    Also, do you have a universal interface board for the above DACs?

    If not, can you suggest the interface board for DAC8568, DAC8718 and DAC81408? And are those interface boards compatible with DXP?

    Thanks,

  • Hi,

    Can someone please suggest an 8-channel, >16-bit resolution DAC which is compatible with DXP?

    Thanks,

    Venkata

  • Venkata,

    I have been out of office sick. Apologies for the delayed reply.

    More or less anything that lists DXP in the Tools & Software tab of the Product Folder is supported by DXP.

    From your list that includes the DAC8568, DAC8718, and DAC8728. The only issue is that historically some of those kits didn't include the MMB0 adn the MMB0 is not listed as an orderable on it's own, so you may have to look to another kit which is listed as an "EVM-PDK" and includes the MMB0. DAC8560EVM-PDK is one such example.
  • Hi Kevin,

    Thanks for the reply. Hope you are doing well now!

    Are DAC8568,DAC8718 and DAC8728 compatible with MMB0? I coudn't figure that out from the EVM user guide.

    Thanks,
    Venkata
  • Hi Kevin,

    Also, Is SM-USB-DIG platform PCB compatible with DXP?
    DAC8568 EVM is compatible with the 5-6K Interface Board (SLAU104) from Texas Instruments as well as the HPA-MCU Interface Board (SLAU106).

    Is any of the above interface boards compatible with DXP?


    Thanks,
    Venkata

  • Venkata,

    DXP is exclusively supported on the MMB0 platform.
  • Hi Kevin,

    Thanks for the reply.

    Are DAC8568,DAC8718 and DAC8728 compatible with MMB0? I couldn't figure that out from the EVM user guide.

    Thanks,
    Venkata

  • Hi Kevin,

    Does the MMB0 board that comes with DAC8560 compatible with DAC8568?
    Because, I see that pin configurations of DAC8560 and DAC8568 are different. If not, what modifications are to be done to MMB0 for it to be compatible with DC8568?
    Will I be able to excite the channels on DAC8568 independently? I mean, can I give different data pattersn on each of the chhanel on DAC8568?

    Thanks,
    Venkata
  • The pin-out of the devices are not relevant as they are installed on their own "daughter-boards" which then connect to a common pin-out / connector on the MMB0.

    You can output different signals on each output, but I should say that that is pushing the bounds of what this tool was originally intended to do. Any application-specific or exhaustive waveform generation is probably best supported by a unique firmware development. DXP is just a simple evaluation tool as opposed to a waveform generation product. So, while it is possible there will be limitations.
  • Hi Kevin,

    Thank you for your support. I went ahead and ordered MMB0+DAC8560 and DAC8568, DAC8718.

    I was able to bring up the standard signals on MMB0+DAC8560 using DXP interface.

    After changing the DAC8568, I was able to observe standard signals(sine, ramp, square) on each of the 8 channels. Using "Waveform file writer", I was able to observe different signals on each of the channels but are still a combination of the standard signals(sine, ramp, square).

    Can you please guide me on using the waveform file converter to output custom data pattern on each of the channels? I am looking for an example txt file which contains data of all 8 channels.

    Thanks,

    Venkata

  • Venkata,

    I'm not sure why the installer is no longer providing the example files and I'm having a hard time locating the original templates, and I'm not sure exactly how helpful the templates would be to begin with. Essentially to support this you want to use the "Formatted File" input type in the "Waveform File Converter" using a tab-delimited (this is most convenient, but you could also use any other delimiter) file which contains the exact commands which you desire to apply to the DAC. So, these commands would include the individual channel addresses along with the data.

    I will continue looking for the original examples. As I said, the age of this tool makes some aspects of it a bit limited.
  • Hi Kevin,

    Below is the waveform file converter in the Utilities menu of DXP. I am using DAC8560 with MMB0. I am trying to generate a square wave pattern of 50Hz using waveform file converter. Some questions regarding this:

    1. I am using DAC Commands in "File Contains" section. Should the DAC commands be Binary or hex?

    2. If I choose "Waveform points" in "File Contains", what format should the file contain?

    3. How is data-rate related to my input signal frequency? For example, data-rate is 1kSPS and input signal frequency is 50Hz, does it mean DAC commands in the input file be a repetition of {Ten sampe points of "Low level of square wave" and Ten sample points "High level of sqaure wave"}.

    Thanks,

    Venkata

  • Venkata,

    If that is all you want as opposed to a more arbitrary waveform,  why not just use the base-level GUI which has built-in sine, square, sawtooth, and triangle waveform types? Alternatively if you just want the file preserved for some reason, there is a built-in Waveform File Writer which will get you directly to the formatted file type. There's some captures of the tool supporting the other part of your question below.

    Concerning your third question - the period of the waveform itself is separate from the update rate from the DAC. To visualize this I'm showing a series of captures from the waveform file writer below. They're all 50Hz sinusoids - but with progressively more points or a faster update rate.

    In the case of user-defined waveforms you are only providing a series of data points. The update rate is required in order to define the resolution of the waveform.

  • Hi Kevin,

    Thanks for the prompt reply.
    I am using square wave just for my test case and understand "waveform file converter". After it works, I am planning to give custom data which is no where close to the standard wave forms.
    Repeating my questions from the previous post here:

    1. I am using DAC Commands in "File Contains" section. Should the DAC commands be Binary or hex?

    2. If I choose "Waveform points" in "File Contains", what format should the file contain?

    3. How is data-rate related to my input signal frequency? For example, data-rate is 1kSPS and input signal frequency is 50Hz, does it mean DAC commands in the input file be a repetition of {Ten sampe points of "Low level of square wave" and Ten sample points "High level of sqaure wave"}.

    Can you please adress third question woth respect to waveform file converter?
    "In the case of user-defined waveforms you are only providing a series of data points. The update rate is required in order to define the resolution of the waveform" -> Should I repeat the data point based on the update rate?

    Thanks,
    Venkata
  • Venkata,

    Understood.

    Unfortunately the installer does not seem to be delivering the example files the User's Guide refers to which would have been very helpful in understanding the input file type expectations. All of this was developed a relatively long time ago, I wrote some of the code myself in fact, but I cannot really firmly remember the requirements. I am working on restoring the old development environment to get you an answer.

    I think you understand the third question background correctly. The input tab-delimited files do not contain any update rate information - it is simply a collection of data. In order to describe how frequently to apply the data, we must apply an update rate. So, if you were to do a square wave for example you could either A) Lower the update rate to match your desired 50Hz square wave or B) provide multiple updates of the same data values at a higher update rate. Let me know if that makes sense.
  • Venkata,

    I was able to restore the original development environment for DXP and find some test files which were used in the development of the file converter. Everything is in binary, tab delimited. Very simple files, actually.

    Hopefully this gets you squared away.

    singleChan_testInputFile.txt
    16384
    16486
    16589
    16692
    16795
    16898
    17001
    17104
    17207
    17309
    17412
    17515
    17618
    17720
    17823
    17925
    18028
    18130
    18233
    18335
    18437
    18539
    18641
    18743
    18845
    18947
    19048
    19150
    19251
    19352
    19454
    19555
    19656
    19756
    19857
    19958
    20058
    20158
    20258
    20358
    20458
    20558
    20657
    20756
    20856
    20954
    21053
    21152
    21250
    21348
    21446
    21544
    21642
    21739
    21836
    21933
    22030
    22127
    22223
    22319
    22415
    22510
    22606
    22701
    22796
    22890
    22985
    23079
    23173
    23266
    23359
    23452
    23545
    23638
    23730
    23822
    23913
    24005
    24096
    24186
    24277
    24367
    24456
    24546
    24635
    24724
    24812
    24900
    24988
    25075
    25162
    25249
    25336
    25422
    25507
    25593
    25678
    25762
    25846
    25930
    26014
    26097
    26180
    26262
    26344
    26425
    26507
    26587
    26668
    26748
    26827
    26906
    26985
    27063
    27141
    27218
    27295
    27372
    27448
    27524
    27599
    27674
    27748
    27822
    27896
    27969
    28041
    28113
    28185
    28256
    28327
    28397
    28467
    28536
    28605
    28673
    28741
    28809
    28875
    28942
    29008
    29073
    29138
    29202
    29266
    29329
    29392
    29455
    29516
    29578
    29638
    29699
    29758
    29818
    29876
    29934
    29992
    30049
    30106
    30162
    30217
    30272
    30326
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    30486
    30538
    30590
    30641
    30691
    30741
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    30839
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    30935
    30982
    31028
    31074
    31119
    31164
    31208
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    31420
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    31540
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    31966
    31997
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    32088
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    32145
    32173
    32200
    32227
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    32395
    32417
    32437
    32458
    32477
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    32515
    32532
    32549
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    32767
    32766
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    32756
    32752
    32747
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    32735
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    32721
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    32674
    32663
    32651
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    32597
    32582
    32566
    32549
    32532
    32515
    32496
    32477
    32458
    32437
    32417
    32395
    32373
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    32327
    32303
    32278
    32253
    32227
    32200
    32173
    32145
    32117
    32088
    32058
    32028
    31997
    31966
    31933
    31901
    31867
    31833
    31799
    31764
    31728
    31692
    31655
    31617
    31579
    31540
    31501
    31461
    31420
    31379
    31337
    31295
    31252
    31208
    31164
    31119
    31074
    31028
    30982
    30935
    30887
    30839
    30790
    30741
    30691
    30641
    30590
    30538
    30486
    30433
    30380
    30326
    30272
    30217
    30162
    30106
    30049
    29992
    29934
    29876
    29818
    29758
    29699
    29638
    29578
    29516
    29455
    29392
    29329
    29266
    29202
    29138
    29073
    29008
    28942
    28875
    28809
    28741
    28673
    28605
    28536
    28467
    28397
    28327
    28256
    28185
    28113
    28041
    27969
    27896
    27822
    27748
    27674
    27599
    27524
    27448
    27372
    27295
    27218
    27141
    27063
    26985
    26906
    26827
    26748
    26668
    26587
    26507
    26425
    26344
    26262
    26180
    26097
    26014
    25930
    25846
    25762
    25678
    25593
    25507
    25422
    25336
    25249
    25162
    25075
    24988
    24900
    24812
    24724
    24635
    24546
    24456
    24367
    24277
    24186
    24096
    24005
    23913
    23822
    23730
    23638
    23545
    23452
    23359
    23266
    23173
    23079
    22985
    22890
    22796
    22701
    22606
    22510
    22415
    22319
    22223
    22127
    22030
    21933
    21836
    21739
    21642
    21544
    21446
    21348
    21250
    21152
    21053
    20954
    20856
    20756
    20657
    20558
    20458
    20358
    20258
    20158
    20058
    19958
    19857
    19756
    19656
    19555
    19454
    19352
    19251
    19150
    19048
    18947
    18845
    18743
    18641
    18539
    18437
    18335
    18233
    18130
    18028
    17925
    17823
    17720
    17618
    17515
    17412
    17309
    17207
    17104
    17001
    16898
    16795
    16692
    16589
    16486
    16383
    16281
    16178
    16075
    15972
    15869
    15766
    15663
    15560
    15458
    15355
    15252
    15149
    15047
    14944
    14842
    14739
    14637
    14534
    14432
    14330
    14228
    14126
    14024
    13922
    13820
    13719
    13617
    13516
    13415
    13313
    13212
    13111
    13011
    12910
    12809
    12709
    12609
    12509
    12409
    12309
    12209
    12110
    12011
    11911
    11813
    11714
    11615
    11517
    11419
    11321
    11223
    11125
    11028
    10931
    10834
    10737
    10640
    10544
    10448
    10352
    10257
    10161
    10066
    9971
    9877
    9782
    9688
    9594
    9501
    9408
    9315
    9222
    9129
    9037
    8945
    8854
    8762
    8671
    8581
    8490
    8400
    8311
    8221
    8132
    8043
    7955
    7867
    7779
    7692
    7605
    7518
    7431
    7345
    7260
    7174
    7089
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    6921
    6837
    6753
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    6505
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    6342
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    5940
    5861
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    5626
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    5093
    5019
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    4726
    4654
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    235
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    93
    82
    72
    63
    54
    46
    39
    32
    26
    20
    15
    11
    8
    5
    2
    1
    0
    0
    0
    1
    2
    5
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    15
    20
    26
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    46
    54
    63
    72
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    93
    104
    116
    129
    142
    156
    170
    185
    201
    218
    235
    252
    271
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    309
    330
    350
    372
    394
    417
    440
    464
    489
    514
    540
    567
    594
    622
    650
    679
    709
    739
    770
    801
    834
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    900
    934
    968
    1003
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    1075
    1112
    1150
    1188
    1227
    1266
    1306
    1347
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    1430
    1472
    1515
    1559
    1603
    1648
    1693
    1739
    1785
    1832
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    1928
    1977
    2026
    2076
    2126
    2177
    2229
    2281
    2334
    2387
    2441
    2495
    2550
    2605
    2661
    2718
    2775
    2833
    2891
    2949
    3009
    3068
    3129
    3189
    3251
    3312
    3375
    3438
    3501
    3565
    3629
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    3825
    3892
    3958
    4026
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    4162
    4231
    4300
    4370
    4440
    4511
    4582
    4654
    4726
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    4871
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    5019
    5093
    5168
    5243
    5319
    5395
    5472
    5549
    5626
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    6342
    6423
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    6921
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    8221
    8311
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    8581
    8671
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    8854
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    9037
    9129
    9222
    9315
    9408
    9501
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    9782
    9877
    9971
    10066
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    10257
    10352
    10448
    10544
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    10737
    10834
    10931
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    11321
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    11615
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    11911
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    12309
    12409
    12509
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    12709
    12809
    12910
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    13111
    13212
    13313
    13415
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    13922
    14024
    14126
    14228
    14330
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    15149
    15252
    15355
    15458
    15560
    15663
    15766
    15869
    15972
    16075
    16178
    16281
    

    dualChan_testInputFile.txt
    16384	16384
    16589	16178
    16795	15972
    17001	15766
    17207	15560
    17412	15355
    17618	15149
    17823	14944
    18028	14739
    18233	14534
    18437	14330
    18641	14126
    18845	13922
    19048	13719
    19251	13516
    19454	13313
    19656	13111
    19857	12910
    20058	12709
    20258	12509
    20458	12309
    20657	12110
    20856	11911
    21053	11714
    21250	11517
    21446	11321
    21642	11125
    21836	10931
    22030	10737
    22223	10544
    22415	10352
    22606	10161
    22796	9971
    22985	9782
    23173	9594
    23359	9408
    23545	9222
    23730	9037
    23913	8854
    24096	8671
    24277	8490
    24456	8311
    24635	8132
    24812	7955
    24988	7779
    25162	7605
    25336	7431
    25507	7260
    25678	7089
    25846	6921
    26014	6753
    26180	6587
    26344	6423
    26507	6260
    26668	6099
    26827	5940
    26985	5782
    27141	5626
    27295	5472
    27448	5319
    27599	5168
    27748	5019
    27896	4871
    28041	4726
    28185	4582
    28327	4440
    28467	4300
    28605	4162
    28741	4026
    28875	3892
    29008	3759
    29138	3629
    29266	3501
    29392	3375
    29516	3251
    29638	3129
    29758	3009
    29876	2891
    29992	2775
    30106	2661
    30217	2550
    30326	2441
    30433	2334
    30538	2229
    30641	2126
    30741	2026
    30839	1928
    30935	1832
    31028	1739
    31119	1648
    31208	1559
    31295	1472
    31379	1388
    31461	1306
    31540	1227
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  • Hi Kevin,

    Thanks very much for the files.

    I converted the single channel file using Waveform file converter in DXP:

    I observe a ~1KHz sine wave, ~150mVpp. Is this what is expected out of the codes in the text file?

    Also, the single channel text file has only 1000 sample points, when converted is the data in an infinite loop?

    How is the number of sample points related to Data-rate?

    Thanks,

    Venkata

  • Venkata,

    The file itself does not have any voltage associated with it. It is just a collection of codes. The magnitude of the output voltage depends on what reference etc. you have the DAC configured to use. The file is assuming a 16-bit DAC and is using approximately codes 0 through 32k (decimal).

    When exercising the waveform, DXP will just loop the file.

    Data-rate is not defined by the file - this comes in at the GUI level. Increasing the number of points and increasing the data-rate will create a higher resolution output waveform.

  • Thanks very much for all the help, Kevin.

    Regards,

    Venkata