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THS4052 had back to back diode inside?

Other Parts Discussed in Thread: THS4052

Hello

My customer intends to use THS7052 for their peak detect circuit.

However, if the input signal were large, ( almost 5Vp-p ... i.e. same range of differential

input voltage rang +/- 4V on D/S page 2 )  , it does not work well..

that is to say, bias current  3mA measured  from in+ pin, and bias current 3mA  measured into in- pin.

Does THS4052 have  4 volt back to back diode internally and perhaps it( diode) turn on?

Please advise.