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DAC3152: OUTPUT

?? ?
Prodigy 10 points
Part Number: DAC3152

Tool/software:


Recently, our company applied DAC3152 to design a laser, after measuring the DAC CLK, the LVDS data from the FPGA, but the DAC did not output.
The data output of the FPGA is oserdes 8:1, a combination of 4 bits on the rising edge + 4 bits on the falling edge, oserdes serclk 300M, and 1/4 serclk on the aligned clock.
Can you help analyze what the problem is and find the cause from there.
I have done the RF_driver.pdffollowing test, AVDD 3.3V is 3.25V, DVDD1.8V is actually 1.76V, sleep pulls up 100K.

  • 0
    Prodigy 10 points

    dac3152 no output,why do me a favor?agent

  • +1 in reply to ?? ?
    TI__Mastermind 39330 points

    Hi,

    Per the datasheet, the outputs need to be pulled high to 3.3V in order to have an output.

    Please try the following. Remove R126 and R127 and put a 50ohm resistor to 3.3V on each side. 

    See picture below.

    Also, the resistor on the BIASJ pin also needs to adjusted to 960ohm per the datasheet recommendations.

    See below.

    Change R139 to 0ohm and change R171 from 820ohm to 960ohms.

    Thanks,

    Rob