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AD9957 Operating as a single supply device...

Question asked by mwfortner on May 7, 2013
Latest reply on May 8, 2013 by sitti

I have a customer that is considering the AD9957 DUC/DAC device on a new design as they have had luck designing this part in previously. The AD9957 is spec'ed with 3.3V digital I/O and a 1.8V core and they want to know if it's possible to run the digital I/O with a 1.8V supply ?

 

They ask because the part will interface with a Virtex-7 that does not have any high voltage (> 1.8V) I/O and they were hoping there might be a way to avoid the level translators that are needed.

 

The other option would be if there was a similar device to the AD9957 with single 1.8V I/O, although they would like to stay with the AD9957 as it's already working on a previous design.

Based on the Power Supply Partitioning in the datasheet, the following AD9957 rails require 3.3v:
• DVDD_I/O (Pin 11, Pin 15, Pin 21, Pin 28, Pin 45, Pin 56, Pin 66)
• AVDD (Pin 74 to Pin 77 and Pin 83)

 

I also could not find a single supply 1.8V DDS/DUC device that also supports the same frequency as the AD9957.

 

Let me know if I missed anything.

 

Thanks in advance for your help.

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