Hi, I have designed an Analog Front End with two opamp stage ADA4896-2.
The power managenment is very important for the project, I need to dimmensionned the voltage regulator for the good current to limit the components area.
The voltage supply is 5.3V, common voltage at 2.5V.
On the datasheet page 5, the typical quiescent current is 2.8mA per amplifier for Vs=5V
On my circuit, I measured the quiescent current = 3.48mA with Vs=5.3V. There is no load, no input signal and the output is linked on the negative input for each opamp.
There is a large difference (x1.55) on the quiescent current betwwen the datasheet and my circuit => do you have some explainations for this difference ?
Thanks for your support.
Precision : current measured of 3.48mA is for the two opamp, so 1.74mA per amplifier instead of 2.8mA TYP
I want to confirm, when you say there is no input, do you mean that the inputs are sitting at 2.5V common-mode, or the inputs are floating?
The non-inverting is floating during the consuption measure. I can easly mesure sur power consuption with 2.5V on the non-invert input.