We plan to use the ADG1234 in one of our products. It will be powered with +/-15V rails (see picture attached). We would like to protect it against over voltages up to +/-25V. There is a 220R series resistor with each analog input we want to protect. We can't increase the resistor value to keep enough BW.
So my questions are :
- Are there clamping diode to VSS in the ADG1234?
- In order to handle the max current in over voltage condition (around 50mA), could you please suggest protection diodes (connected between input/output terminals and VDD, VSS) with very low capacitance (let's say 1pF total max.) which can meet the ADG1234 specs & our 25V input protection requirement?
Thank you in advance,