Hi Sir,
Sorry to bother you.
We have use OPA1622, now have pop noise issue.
OPA1622 V+/V- is +15v/-15v. It's use TPS65131 to provide it.
When V+ turn on, we saw short pop noise at Input/output. Please refer as below
1.Dark blue is OPA1622 pin2 V+/15v.
2.Blue is OPA1622 pin8 EN.
3.Green is OPA1622 pin9 output
4.Purple is OPA1622 pin10 Input
We have disconnect input( Float Pin10), Please refer waveform
We have disconnect input(P10 tied 2200pF to GND), Please refer waveform
Is this pulse is normal?
If Yes, We would like to know where will make this noise. Power or?? and how to fix it.
If No, Does TI have other solution can cover it?
By the way, OPA1622 input side is from two LME49720 provide.