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AD5764R power sequence, what do I need to do?

Question asked by starraytheon on Feb 12, 2017
Latest reply on Feb 17, 2017 by msamera

Hi Experts,

For AD5764R, the negative supply can be tied to AVss, Voutx can output negative voltage.

I have a question, how about the AVss works with output amplifier of AD5764R internal?

I saw the R-2R ladder produce Iout to a buffer Amp, but it seems one stage OPA can't generate negative volt.

I guess the 2nd stage Amplifier needed behind the Fig39 output Amp, to shift volt level and adjust offset.

If the output can be controlled by PIN9&10, how about the RST IN/OUT works? What is their sequence?

Do we need to keep attention on power sequence of AVss, AGNDx, AVdd?

How about the status of DAC output if no digital signal applied to Data Bus? I mean Analog power on, Digital power off.

Is there any risk if we don't take care the power sequence? AVss has opp to short circuit and burn out?

If it is possible, I want to know the internal block of DAC output stage.

Thanks a lot for your help!

 

B&R

Tom

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