Thank you all for your help.
Now I have another question regarding the output noise. I have already done a noise analysis. As sources, I have chosen the supply voltage, and I see Vout and V(R1, R11, R12) as the sum of the Vrms(noise) of all of them. I have until now just about 12uVrms noise, but the datasheet wrote the Vrms noise as about 60uVrms. It means that there is a big difference between my noise analysis and the one from the datasheet. Could you please give me some hints/solutions for these differences? Respectively, How would I calculate the Total Noise of the System ?

 

Thank you all for your help.
Now I have another question regarding the output noise. I have already done a noise analysis. As sources, I have chosen the supply voltage, and I see Vout and V(R1, R11, R12) as the sum of the Vrms(noise) of all resistors is 6uVrms. But inside of the datasheet has been written the Vrms noise of LDO is about 60uVrms. It means that there is a big difference between my noise analysis and the one from the datasheet. Could you please give me some hints/solutions for these differences? Respectively, How would I calculate the Total Noise of the System for 10kHz-100kHz in order to reach about a noise amount of 60uVrms?

 

Thank you all for your help.
Now I have another question regarding the output noise. I have already done a noise analysis. As sources, I have chosen the supply voltage, and I see Vout and V(R1, R11, R12) as the sum of the Vrms(noise) of all of them. I have until now just about 12uVrms noise, but the datasheet wrote the Vrms noise as about 60uVrms. It means that there is a big difference between my noise analysis and the one from the datasheet. Could you please give me some hints/solutions for these differences? Respectively, How would I calculate the Total Noise of the System ?

There is nothing in the model that indicates noise modeling is included in the models implementation.
It is a simple model.

 

.MODEL MOD1 PMOS (VTO=-0.82 RS=0.2 RD=0.2 IS=1E-15 KP=0.73 KF=2e-19 AF=1.22)
Specify a guaranteed value above which the noise will not exceed. And the noise value has a production variation!
Models usually specify parameters corresponding to a typical case.

 

As it turned out, 60 μV RMS is a typical value. I improved the model by adding a noise voltage source to the ADJ input. Note that the correction capacitor reduces the noise. You can get the new model on my web page.

 

As it turned out, 60 μV RMS is a typical value. I improved the model by adding a noise voltage source to the ADJ input. Note that the correction capacitor reduces the noise. You can get the new model on my web page.View attachment 268198

First of all, Sorry for the delay; I have a small sohn because of that sometimes I can't answer immediately.

Second, Thank you very much for your reply and the model. I m not sure I understand it correctly. How could I be sure that a Model is suitable for my Application or not by simulation in LTspice??? Because I don't know how much noise doesn't make worse, my sensor Board. In the Other words, should I Test some well-done Designs of the Board in any way?

with best Regards.