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The power supply input cables should be kept separate from noise sensitive lines
such as microphone/earphone cables.
The insertion of EMI filter on VBATT pins is suggested in those designs where
antenna is placed close to battery or supply lines.
A ferrite bead like Murata BLM18EG101TN1 or Taiyo Yuden P/N
FBMH1608HM101 can be used for this purpose.
The below figure shows the recommended circuit:
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