In our project we are using multiple PGA 280s. We have some trouble in powering up PGA 280s.
The datasheet indicates that care must be taken as shown in figure below for good power supply.
For one pga 280 and When VSON = 0V everything is okey.
In our design we have 4 pga280s and VSON is connected to -5 V supply.
Question is should I multiple RC filter and Schottky diodes for each PGA 280 or is it enough to place them once.
Another question is should we add extra diodes when VSON is connected to -5V in order to prevent substrate reversing.
The example is given for VSON =0V. What mojor changes required when VSON=-5 ?. (Should we also change RC filter configuration below ?)
Thanks for your time.
