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DAC8812: DAC 8812 synchronization output related issues

jeno.zhang
Expert 2525 points
Part Number: DAC8812

Hello，

Can DAC8812 synchronize output of different voltages? Is it implemented on software or hardware？ How to operate?

Thanks！

  • 0
    TI__Mastermind 33938 points

    Hi Jeno, 

    Are you asking if it is possible to update the output of the two DAC channels at the same time? You can do this by using the LDAC feature. This loads the DAC output register with the data in the input register for each channel at the same time.  

    This is done by pulsing the LDAC HW pin low:

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Expert 2525 points

    hi Katlynne，

    The customer wants to use DAC8812 to output two currents simultaneously, but the currents are different. My understanding is that SDI is written into the register, and then Adress Decoder is used to write them into the DACA and DACB registers respectively. Then, LDAC HW pin is used to trigger the two currents to output at the same time. Is this the flow process?

    Thanks！

  • 0 in reply to jeno.zhang
    TI__Mastermind 33938 points

    Hi Jeno, 

    That's exactly right! Update the desired values to DACA and DACB using SPI communication (they do not need to be the same value), then use the LDAC pin to actually update the two outputs at the same time. 

    Best,

    Katlynne