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DAC8760EVM: Error with setup the EVM Board.

Dheeraj yadav
Intellectual 590 points
Part Number: DAC8760EVM
Other Parts Discussed in Thread: DAC8760, , DAC8760EMC-EVM

Hey, We are using DAC8760 EVM board our testing purpose. 

In starting we provide the +24V and GND to board +15V and GND, So the protection diode D1 and D2 was burnt. We remove both the diode and then provide +24V and Gnd to the board.

Is that correct? 

www.ti.com/.../sbau229.pdf

  • 0
    TI__Guru* 93465 points

    Dheeraj,


    There are two different evaluation boards for the DAC8760. For one, the diodes protect through the full range of supply operation. For that, it is the DAC8760EVM, and you can find the EVM User's guide here:

    https://www.ti.com/lit/pdf/sbau205

    However, there is a different evaluation module called the DAC8760EMC-EVM and that circuit is a bit different than the original. That is the EVM that you referenced in your post. That EVM is a bit more limited in supply voltage as you've seen. The protection diodes protect for a different range of supply (as you've now seen).

    Without the protection, the board should still operate, but I'd still recommend replacing the diodes just in case you think you might have other voltage excursions that might damage the board.

    The DAC8760EMC-EVM has the user guide at the link that you provided. However, it has an additional writeup that shows the design guide for the board, which you might find useful:

    https://www.ti.com/lit/pdf/tidu011

    Joseph Wu

  • 0 in reply to Joseph Wu
    Intellectual 590 points

    We are using the single-mode power supply for test this module, so if this module work as single-mode we have to short the Jumper J4 Pin 2and 3 and provide the +24volt power supply to pin1, is that correct or any more correction we have to make. 

  • 0 in reply to Dheeraj yadav
    TI__Guru* 93465 points

    Dheeraj,


    Again, the DAC8760EMV-EVM seems to have been designed for +/-15V supplies based on the protection diodes, and the DAC8760EVM is the version that should be able to take a +24V supply.

    However if D1 and D2 have been replaced, and you don't expect D5 and D6 to go beyond 15V then it should be ok. All capacitors are rated to 50V or higher, and the CD143A-SR70 diodes should take a 24V as a higher reverse bias voltage (if you've replaced D5 and D6 with higher voltage TVS diodes).

    At this point, I don't see any other corrections you need to make.


    Joseph Wu

  • 0 in reply to Joseph Wu
    Intellectual 590 points

    Thank You, Joseph 

    It's Working now ..!