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ADC9680CE04B evaluation Board Design Sources

Hi,

We have downloaded the design sources of ADC9680CE04B from analog wiki.The download link is : https://wiki.analog.com/resources/eval/ad9680-1000ebz.

There are more mismatches between Schematic and BOM.

1.For example U402 in schematic it is indicated as ADM7160AUJZ-1.8 and in BOM it is ADP170AUJZ-1.25-R7. This is SPI power supply to AD9680. The output is always 1.25v beacuse of wrong part number. In AD9680 datasheet minimum Supply volatge to SPI is 1.8V. 

 2.In Schematic R416, R418, R420, R430 and R432 value is 66.5K but in BOM these are 56K. 

We would like to know the design sources are latest or not.

Thanks & Regards

Rama Krishna

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  • Hello Rama Krishna,

    SPIVDD supports 3.3V, so your proposal is ok. But SPIVDD can also be run at 1.25V if needed. We have characterized it to run at 1.25V.

    I used 86.6k because the 1.25V domain had ferrite beads that had higher than normal DCR. So the only way to adjust for that was to bump up the voltage on the LDO. If you have a low enough DCR on your ferrite bead, then you can use the 84.5k. however, if the voltage drops too much, you will pay a penalty in AC performance (SNR/SFDR) or worse, the ADC might not even function. see  Because Mr. Ohm Said So … | Analog Devices 

    C700 is actually a DNI as the BOM correctly says. It is only required if you are I/O limited on the FPGA and want to use a single ended REFCLK to the FPGA. 

    Thanks

    Umesh

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  • Hello Rama Krishna,

    SPIVDD supports 3.3V, so your proposal is ok. But SPIVDD can also be run at 1.25V if needed. We have characterized it to run at 1.25V.

    I used 86.6k because the 1.25V domain had ferrite beads that had higher than normal DCR. So the only way to adjust for that was to bump up the voltage on the LDO. If you have a low enough DCR on your ferrite bead, then you can use the 84.5k. however, if the voltage drops too much, you will pay a penalty in AC performance (SNR/SFDR) or worse, the ADC might not even function. see  Because Mr. Ohm Said So … | Analog Devices 

    C700 is actually a DNI as the BOM correctly says. It is only required if you are I/O limited on the FPGA and want to use a single ended REFCLK to the FPGA. 

    Thanks

    Umesh

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