The AD8648 meets AEQC-100. It passed HBM ESD on all pins at 1kV.
You said: "I can´t use a surge protection on the output of the opamp"
Did you really mean output or input?
What is your source impedance in this configuration where you replaced MCP6004 with LT1679 and got higher noise reading?
If your input impedance is "high", you'd want to choose a device which has low current noise density. LT1679 input current…
A quad is not four op amps in one package, it is four functions in one piece of silicon. At high
frequencies, you have coupling with stray C to substrate, through the bond wires, between
the traces on the pc board, etc. If you have capacitance…
We are now studying to replace LMV84x on existing system by AD8646 or AD8648, then having questions as follows.
1) Absolute Maximum Ratings of input voltage at AD8646/8648 is defined as "GND to Vsy".
I could not find any clear definition…