AnsweredAssumed Answered

AD8066 excessive current

Question asked by NickWill on Nov 28, 2017
Latest reply on Dec 6, 2017 by NickWill

Hi

I am trying to use an AD8066 in a 4-pole filter, followed by gain stages and a peak detect. It is a HP filter with a cut off around 2MHz. The supply is +/-12V.

When I power it up I find excessive current and the chips get warm. If the overall input is shorted it will usually start up correctly. As there is high gain when the input is open there will be large signals generated in the gain stages, however the amplitude is no bigger than when operating correctly. Typically in this state I will get the -12 supply powered, but the +12 limited to +2.4V by current limit.

Lowering the supply rails does not seem to help.

 

I hope someone can help me on this.

Nick

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