I have made a couple of trial boards and tried to operate AD5724 on the board.
I set the DB0 to DB3 of the power control register to "1" but could not get any analog output. However only adding to set DB4 to "1",
I could get expected output value.
- According to the data sheet, DB4 is fixed "0" value. Why I could get the expected output by changing DB4 to "1"?
- Is data sheet not correct regarding the DB4 spec, or I should take another way (not change DB4) to solve this issue?
Just want to be sure, are you using AD5724? Or is it AD5724R?
AD5624R's Power Control Register [DB4] is assigned as PUref, which has a default value of 0 which means the internal reference is in power-down mode, it needs to be set to 1 to power it up and get the proper output.
I'm using AD5724, not AD5724R. The AD5724 data sheet Table 26 is showing that DB4 is set to 0.
Could you take care of this case?
Sincere apologies for the delay, I will discuss this with the design and will get back to you as soon as possible.
One more question, I assume that the external reference voltage is applied to the reference pin, correct?
The external reference was not connected. Now I fix the issue. Very sorry to trouble you.