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Part Number: LM4819
My customer have the pop noise issue when power down timing.
Output waveforms and schematics are below,
The condition2 is little bit improved the pop noise than conditon1. However. customer have to decrease the pop noise more.
Could you please give me your advice for improvement method?
Condition1: Ci=0.22uF, Ri=47kΩ, Cb=1uF
(Ch1：VDD(5V) Ch3：Vo2＋ Ch4：Vo1- Math：Ch3-Ch4)
Condition2: Ci=0.1uF, Ri=100kΩ, Cb=1uF
Schematics (same circuit in datasheet)
I missed the attached file.
In reply to Yusuke Mukuno:
In reply to José Luis:
Customer try device shutdown before Vdd power down. They use SHUTDOWN pin. SHUTDOWN pin is active-high. In this case, the pop noise is improved.
Shutdown pin is pulled up other 5V power supply. (Controled by MCU)
At that time. It will become VDD pin voltage < Shutdown pin voltage .
Is it no problem?
I willl try to suggest pull-up to Vdd to customer.
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