This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC38RF83: Is "Toggle RESETB pin low then high" necessary?

Part Number: DAC38RF83

In datasheet 8.1.1 Start-up Sequence, "Toggle RESETB pin low then high." is showed. Is this necessary?

To avoid unintended reset, I will not connect RESTB pin to any controller such as CPU or FPGA, and place a pull-up resistor of 1kohm or less on RESETB pin 
Does this circuit have any problem?
I afraid unintended DAC output before configuring DAC38RF83.

  • Hello,

    In datasheet 8.1.1 Start-up Sequence, "Toggle RESETB pin low then high." is showed. Is this necessary?

    Yes, this step is necessary. The reset circuit reset all of the internal digital logic to ensure good known start-up of the device.

    To avoid unintended reset, I will not connect RESTB pin to any controller such as CPU or FPGA, and place a pull-up resistor of 1kohm or less on RESETB pin 
    Does this circuit have any problem?

    I recommend to have a reset signal to reset the DAC at start-up. A pull-up resistor is good practice to ensure after initial reset the RESETB pin is always in logic HI

    I afraid unintended DAC output before configuring DAC38RF83.

    Please take advantage of the TXENABLE signal. The TXENABLE signal ensures the output are in shut-off during initialization. You can then enable the TX through TXENABLE after the complete DAC + JESD204 initialization

  • Thank you for your support.

    I understand a hard reset step is necessary not only for programming registers to their default state but also for reset all of the internal digital logic.
    Thank you.