AD8672 is very easy to be damaged

Question

I already destroy more then 10 pcs AD8672 in my experiment. 
 I just use it as a low noise unit gain buffer. 
 Supply voltage are +/-12V 
 IN+ is connected to the reference output from LM399. IN- and output is shorted to provide the negative supply voltage of AD5541. 
 But I found that the IN+ will follow the negative supply voltage ( ie, -12V ) in my PCB. 
 Can any one give me the advice?

FormerMember · Accepted Answer

Please supply schematic. 
 Harry)

FormerMember · Answer

Tina, 
 I don't see anything driving node "VSET"?? 
 Which one are you burning up? IC4/IC7/IC8/IC11?? 
 Harry

FormerMember · Answer

Tina, 
 That's strange. I would have suspected IC11. 
 The only thing I can think of would be power supply sequencing issues. 
 Put a 1k resistor in series with each non-inverting input. 
 R37 will probably have to be lower. 
 Harry

FormerMember · Answer

Tina, 
 V minus, then V plus, then the analog inputs. 
 Theoretically yes, but I doubt you would see it. 
 Harry

EZAdministrator · Answer

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AD8672 is very easy to be damaged