Hello,
I am testing a low-noise linear regulator, ADP7102ARDZ-5.0-R7, and have found that the output voltage appears to shift when an object is placed near the top of the IC.
For example I am getting about 330 uV of dc voltage shift in the output when I bring the eraser end of a conventional pencil within 2mm of the top of the IC (SOIC-8 package). Large objects near the top of the IC can cause larger dc shift, up to around 5mV.
Vout at Iload=10mA
5.00105V (no object nearby)
5.00072V (eraser end of conventional pencil within 2mm of IC)
Here is the schematic (DaveCAD format):
![ADP7102 low-noise linear regulator, nearby objects produce dc offset at output](https://www.eevblog.com/forum/index.php?action=dlattach;topic=329515.0;attach=1514893;image)
I have left the exposed thermal pad floating (the regulator is only dissipating 16 mW). Per the datasheet the exposed pad (EPAD) is internally connected to ground.
![ADP7102 low-noise linear regulator, nearby objects produce dc offset at output](https://www.eevblog.com/forum/index.php?action=dlattach;topic=329515.0;attach=1514899;image)
Anyone have ideas why such dc shift is showing up and how to solve?
Thanks.