Hi

As is shown above,when Vlogic and VDD supplies of 3.3 V,all the channels can output correctly except the maximum voltage is 3.2 V.However,when Vlogic and VDD supplies of 5 V,only some of the channels can output from 3 V to 4.9 V.When I send data…

芯片的电路如图

（1）当VDD=Vlogic=3.3V时，所有通道都能正常输出，但是最大输出电压为3.2V，其他都正常；

（2）当VDD=5V,Vlogic=3.3V/5V时，只有一两个通道能输出，最大输出电压4.9V，并且当控制输出小于3V时，整个系统就崩溃了。

我想知道这个到底是什么问题，是我的程序有问题吗？但是为什么情况（1）的时候除了最大电压其他都正常？还是说我的硬件设计有问题？

谢谢！

In the page 15 of data sheet , upper dead band is described as follows.

DC specifications tested with the outputs unloaded, unless otherwise noted. Upper dead band = 10 mV and exists only when the internal reference voltage (V REF ) = V DD 
with gain …

Hi all,

how long I have to wait before writing the next command to the AD5671R?

Kind regards,

Paul