Category: Hardware
Product Number: ADG723
Dear Sir,
In our pcb at one section we have designed a resistors string ckt consisting of 6 resistors in series which generate voltage as per their equivalent combination. The last 6th resistors which is reference to gnd its equivalent resistance value we are changing by using your ADG723 analog switch at which its source terminal we are connecting one other resistors which comes in parallel to the 6th resistors when our controller gpio is made high. We have generated an on board supply which have net label VCC5V and this is used to power our ADG IC but while designing ADG723 section at its VDD pin we have provided wrong net label i.e VCC_5V ( which is not present in our ckt).So as per that no voltage should get applied to our VDD pin of ADG723 IC. But after powering the pcb we have found 3.26v at its VDD pin. Initially we thought it may be layout issue, then we removed IC and checked at its footprint and 0v is observed. So, its not layout fault. So, sir we want to know how these IC is getting power at its supply pin is there any internal circuitry which driving because as its S2 is normally connected to D2 and at that point 3.8V is coming by resistance voltage generated. So, sir due to these the voltage is coming at its supply pin. Please sir let me know if you have any idea related to it. I have attached the schematic section of its for your reference please refer it.
Waiting for your reply,
Thanks & Regards,
