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TI Evaluation Module for ADS127L01 Delta-Sigma ADC - Review

Scoring

Product Performed to Expectations: 8
Specifications were sufficient to design with: 9
Demo Software was of good quality: 4
Product was easy to use: 6
Support materials were available: 7
The price to performance ratio was good: 7
TotalScore: 41 / 60
  • RoadTest: TI Evaluation Module for ADS127L01 Delta-Sigma ADC
  • Buy Now
  • Evaluation Type: Evaluation Boards
  • Was everything in the box required?: Yes
  • What were the biggest problems encountered?: Application software at very early stage of development, very few analysis options available.

  • Detailed Review:

    Overview:

     

    The ADS127L01EVM is an evaluation module that provides hardware and software support for evaluation

    of the ADS127L01 delta-sigma ADC. The EVM utilizes the TM4C1294NCPDT processor to communicate

    with the ADC via SPI and provide communication with a PC over USB interface. The EVM also includes a

    software application that runs on a PC to allow for register manipulation and data collection from the ADC.

     

    IMG_20170505_125241.jpg

     

    Hardware:

     

    The EVM is powered via the USB interface with the PC.

     

     

    The EVM comes configured with the following hardware settings.

     

    Inputs:

     

    Analog input signals can be connected through the SMA connectors (J7 and J9) or through the terminal

    block (J8).

    By default, the EVM is configured for a fully-differential analog input signal.

     

     

    Access the digital signals of the device via the debug header (J6). This header allows for the connection

    to a logic analyzer or to another processor when the Tiva microcontroller is not used.

     

     

    Other Hardware sections:

     

    The onboard oscillator, Y2, provides a 16-MHz, low-jitter clock for the ADS127L01.

     

     

    The ADS127L01 uses hardware mode pins to select the operating mode, interface mode, digital filter

    response, and oversampling ratio (OSR).

     

     

    The reference voltage on the ADS127L01 is the voltage difference between REFP and REFN. REFN is

    tied directly to AGND.

     

     

    Software:

     

    Download the DELTASIGMAEVAL-GUI-installer.exe installer and the ADS127L01-devpkg.exe from the ADS127L01EVM tool page and

    save to a known folder. Run the installers and follow the on-screen prompts.

    Note: I had some issues with the device drivers being automatically loaded by Windows 7, this required manual driver loading in device properties.

     

    After the Delta-Sigma ADC EvaluaTIon Software and the ADS127L01 device package are installed,

    ensure that all jumpers and switches are in their default positions and then connect the

    hardware with the provided USB mini cable. Start the Delta-Sigma ADC Evaluation Software. The GUI

    automatically detects the connected hardware and displays the device register map under the Main tab.

     

    software1.JPG

     

     

    The EVM software provides an alternate way to configure the ADS127L01 hardware mode pins when

    JP11 is uninstalled. These controls can be found underneath the Register Controls on the Device tab.

     

     

    Data is collected by clicking the Data Analysis button from the ribbon menu. This will launch the Analysis

    Engine in a separate window. The Analysis Engine is used to collect, analyze, and save data from the

    EVM.

     

    Data Inspector

    Software2.JPG

     

    Time Domain

    Software3.JPG

     

    Histogram

    Software4.JPG

     

    No other analysis options are available at the current software status, the software does however

    allow the export of data to the legacy application HSDC Pro format, which does have more advanced

    analysis tools.

     

    Capture.JPG

     

    There is also a console window option enabled in settings, for manual control and scripting.

     

    Console.JPG

     

    Test Inputs:

     

    50hz

    50hzsq.JPG50hzbin.JPG

     

    2.5khz

    2.5khz square.JPGlots of points.JPG

     

    Conclusion:

     

    The ADS127L01 24-bit, delta-sigma (ΔΣ), analog to digital converter (ADC) is a very versatile chip. I look forward to working more

    with this EVM in the future, but the software definitely needs to mature more with at least a good FFT analysis option.


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