The responce of AD637 when the large signal is came

Dear Sir/Madam,

I just use your AD637 RMS to DC converter.
Input is the sound signal.
CAV is put 100uF capacitor.
When the large sound is inputed to AD637 Vin momentarily,we just found to output pulse-signal.
So the analog meter that is put the RMSOUT-pin was shaked off.
So I replaced the CAV capacitor 100uF to 2.2uF.
Then this trouble was fixed.
I have a question.
Why this trouble was happen? I would like to know the reason why.

Thanks, Kaos

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