noise of SSM2019

Question

Dear Sir/Madam, 
 We are using SSM2019 Self-Contained Audio Preamplifier. 
 We have observed the noise on our system. Pls refer to the attached file. 
 sheet1. Our test circuit diagram. sheet2. Waveform which the noise occurred. sheet3. Normal waveform. 
 It is irregularly-recurring noise and the repetition is not regular. Quantity of the device that this phenomenon occurred :9pcs/460pcs 
 We would like to know the cause of this noise. 
 It would be greatly appreciated if advice could be gotten. 
 Sincerely yours, Kou

EZAdministrator · Accepted Answer

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HMS95 · Answer

Hello Kou, 
 For pop's or pop-corn noise, please de-soldering SSM2019 then clean pads then resolder again. if you have the same issue, check other parts soldering. extremally small gaps between Pad and solder joints cause this problem. also, very small (tiny) soldering with a very small gap from Pad's add random sparks (pop-corn sound). Mostly, bad soldering cause this phenomena. 
 hope this helps. please give us your feedback.

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noise of SSM2019