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using AD5390 in SPI mode when DCEN is not connected

Hi, I am working with a legacy circuit in which the AD5390's DCEN/AD1 input was not tied either high or low. The design was suppose to operate in standalone mode for an SPI bus. Is there any guarantee that the AD5390 will operate in SPI standalone mode? 

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  • Hi Sal,

    You might still have problems during a write sequence if the DCEN is accidentally high. If there are cases wherein you might have added some clock signals the data will ripple  out of the shift register and would appear on the SDO line.

    So we are recommending all input pins  like the DCEN/AD1 to be at known states at all times.

    Best regards,


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