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DAC3482 reset requirement

On our PCB, the reset and txenable pins in not connected.  The power-up sequence in the datasheet lists settings for both TXENABLE and RESETB as part of the recommended procedure.  Are these required or can we get proper functionality from the IC with these pins not connected?


Thanks for your help.

  • The Resetb will initiallize all of the register values to their default state. This ensures that you are working in a known state after initial power up. Alternatively, you can bypass this step and assume registers come up in default on power up as expected or proactively program the default registers directly.
    The TXENABLE is used to disable the output while the device is being configured and programed. If not done, there is a possibility of spewing out garbage signals that could be very high amplitude and could stress subsequent stages in the line-up. So in essense this is a safety procedure. If this pin is not connected then you can use the sif_txenable via SPI write to achieve a similar function.
    --RJH