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AD8130: Over-voltage Protection of Cable-Tab Amplifier

Question asked by ActiveJimBOB on Dec 7, 2016



We've implemented the AD8130 circuit similar to the circuit shown in Figure 143 of the Datasheet - A cable tap video amplifier with a gain of 1.


We have found that the device is damaged easily when either:

video sources are connected up or powered up in the wrong order,

incorrect termination,

or a video source that is on a different power supply.


Figures 145 and 146 of the datasheet show series resistor in the inputs, please can recommend suitable values to provide adequate protection during installation?