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TSW1400EVM: TSW1400EVM power supply problem

jiaxuan liu
Prodigy 85 points

Part Number: TSW1400EVM

hello staff

I had this problem after testing with TSW1400EVM

According to the communication with some staff, the problem is generally concentrated in the power supply part.

I use the Agilent E3632A power supply here, with a power supply range of 0-15V 7A channel. When powering the TSW1400EVM, the current is always kept at around 0.38A at a voltage of 5V, which is too far from the 4A current in the manual.

According to some posts, the power supply cord has also been replaced, but there is still no progress. May I ask what could be the problem?

In addition, after I use HSDC Pro to download fireware to TSW1400EVM, the current of the board can be maintained at 1.1A, which seems to indicate that the hardware is not broken, but it still cannot reach the level of 4A.

  • 0
    TI__Mastermind 21435 points

    Hi Jiaxuan,

    The 4A limit in the user documents is not a constant draw limit. This allows the FPGA plenty of headroom during the firmware download stage as there may be some transients that spike above 3A. I cannot recall the exact current for the TSW1400EVM after firmware download but 1.1A sounds about right. Are you testing with any specific ADC EVM as of yet? I'm not sure that you are having any actual problem. The "No firmware. Please select a device to load firmware into the board." message is not an error but instead just an informational pop-up that let's you know the TSW1400EVM was power cycled between HSDC Pro instantiations. For instance, if you download firmware to the TSW1400EVM and remove the USB cables / restart HSDC Pro without removing power to the TSW1400EVM, when you connect to the board in HSDC Pro again, you will not find this message but instead it will already have the firmware installed from the previous session. The next step for you will be to select the device in the upper left corner which corresponds to the ADC EVM that you have connected. These files contain critical information regarding the mapping between the ADC and the FPGA, which allows many of the ADC EVMs to work with just a single data capture board. 

    Regards, Chase

  • 0 in reply to Chase W
    Prodigy 85 points

    Hi Chase,

    In fact, I use both ADS4249EVM and TSW1400EVM to sample data. The steps I did are as follows:

    When I see this message, I chose to "download fireware". Because I use ADS4249 and there is "Interface name="ADC_BYTE_WISE_2CH"" in "ADS424x.ini", I chose ADC_BYTE_WISE_2CH.rbf to download in board. After downloading fireware, the current up to 1.1A when voltage is 5V. Then I select ADS424x in select ADC botton. It can work. But there is still problem.

    The clock signal for ADS4249EVM is 160MHz and the input signal in CH_B is 20MHz which is produced by AWG.

    But the sampled signal has a lot of harmonics. And it is necessary to set ADC sampling rate equal to the clock rate. Is this normal?

    Regards

  • 0 in reply to jiaxuan liu
    TI__Mastermind 21435 points

    Hi Jiaxuan,

    Can you upload any images for what you are seeing? You will have to set the ADC Output Data Rate field of HSDC Pro equal to the sample clock frequency.

    Regards, Chase

  • 0 in reply to Chase W
    Prodigy 85 points

    Hi Chase

    Thank you very much for your prompt reply.

    When I set sampling rate and clock rate as 160MHz and the input signal rate is 20MHz, the image is like this.

    I have to say even it has a big spike at 80MHz, I can still accept it. But I dont understand why its so high.

    But when I set sampling rate and clock rate as 250MHz and the input signal rate is 20MHz, there are many big harmonics in it like this:

    It's confused.

    The input signal is a sine one generated by AWG7122C.

  • 0 in reply to jiaxuan liu
    TI__Mastermind 21435 points

    Can you try to reduce the input amplitude to around half for a quick test?

    The software is labeling the fundamental as a spur and is marking the fundamental at 2.441kHz (the minimum RBW). Are you clicking on the gear icon and pressing enable? If so, this will force the software into using the tone entered into the ADC Input Target Frequency field rather than searching for these parameters on its own.

    Thanks, Chase

  • 0 in reply to Chase W
    TI__Mastermind 21435 points

    Uncheck this enable box and see if the fundamental is marked correctly. I am wanting to see a few things from this such as the fundamental level and the levels of the HD2/3/4/5 harmonics. If this does not correctly mark these values, try to enter the exact frequency into the ADC Input Target Frequency field. 

  • 0 in reply to Chase W
    Prodigy 85 points

    Hi,Chase

    I uncheck this enable and set input frequency as 20MHz. But HD2/3/4/5 is too high.

    And I also reduce the input amplitude to around half.

    The results like this:

    Regards

  • 0 in reply to jiaxuan liu
    TI__Mastermind 21435 points

    Jiaxuan, if you look on the left of the page now you can see the fundamental level is a positive value, meaning the ADC is overranged. Keep reducing the input amplitude until the fundamental amplitude is less than 0dBFS.

    Thanks

  • 0 in reply to Chase W
    Prodigy 85 points

    Hi, Chase

    As you say I reduce  the input amplitude. Now its less than 0dBFS. But the noise is higher than before.

    Regards

  • 0 in reply to jiaxuan liu
    TI__Mastermind 21435 points

    Hi Jiaxuan,

    Something is still not right here. I'm going to lock this thread as the subject has swayed too far from the original posted question. Can you create a new post with the title as something like ADS4249EVM harmonics / noise floor issue and we will carry on from there.

    Thanks