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AD9858 - Still need help on my schematic

Question asked by Suluku on Oct 22, 2014
Latest reply on Oct 24, 2014 by Suluku

Hi all,

I'm using the AD9858 to generate a sweep frequency. Using the the evaluation board Rev.(D) powered vcc, dvdd and avdd pins on 3.3v with no power to the 5v (CP), I am able to get the required output as long as the PC Control Jumper W2 on the board is set to Enable which means the 3 flip-flops 74AHCT574 have to be active even though I'm not using the parallel communication. When on Disable no more signal.

I'm using SPI (pin 22, 19, 18, 17 and 16).

On my own schematic attached, I'm just using the minimum pins needed and letting some float. I have added pinheader (SV1) to set the address pins in logic low or high but still no output.

The same program does not give me any output.

Is there anything I'm missing or a mistake on my schematic?

Any help will be greatly appreciated.

Thanks

AD9858.png

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