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AS3418 Datasheet(PDF) 38 Page - ams AG |
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AS3418 Datasheet(HTML) 38 Page - ams AG |
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38 / 77 page  Document Feedback AS3418 Functional Description Datasheet • PUBLIC DS000507 • v4-00 • 2020-Jan-23 77 │ 38 Figure 49: Playback Only Mode Timing Diagram 6.9 VNEG Charge Pump The VNEG charge pump uses one external 2.2µF ceramic capacitor (CFLY) to generate a negative supply voltage out of the input voltage to supply all audio related blocks. This allows a true-ground headphone output with no need of external DC-decoupling capacitors. Figure 50: VNEG Charge Pump The charge pump typically requires an input capacitor CVBAT with 4.7µF, an output capacitor CVNEG with a capacity of typ. 10µF and a flying capacitor CFLY with 2.2µF. ANC/CSDA Pin ANC ON Playback Only Mode ANC ON 200-400ms 200-400ms >65% VBAT <35% VBAT Operation Mode Charge Pump Connection to audio blocks VBAT VBAT VNEG VNEG CVNEG CVBAT CFLY |
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