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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3415 датащи(PDF) 49 Page - ams AG |
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AS3415 датащи(HTML) 49 Page - ams AG |
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49 / 102 page  ams Datasheet, Confidential: 2014-Jun-13 [v1-30] AS3415/AS3435 – 49 Detaile d Desc rip t ion VNEG Charge Pump The VNEG charge pump uses one external 1μF ceramic capacitor (CFLY) to generate a negative supply voltage out of the battery input voltage to supply all audio related blocks. This allows a true-ground headphone output with no more need of external DC-decoupling capacitors. Figure 63: VNEG Charge Pump VNEG Charge Pump: This figure shows the block diagram of the VNEG charge pump that supplies all audio blocks of the AS3415/35. The charge pump typically requires an additional input capacitor, CVBAT of 10μF and output capacitor, CVNEG, with the same size as the input capacitor. The flying capacitor, CFLY, should be 1μF. If hybrid operation is desired, which means two ANC chips are working in parallel, it is possible to disable the VNEG charge pump and share one charge pump for both chips. This should help to reduce the system power consumption of the headset. Parameter VBAT=1.5V, TA= 25ºC, unless otherwise specified. Figure 64: VNEG Charge Pump Parameter Symbol Parameter Conditions Min Typ Max Unit VIN Input voltage VBAT 1.0 1.5 1.8 V VOUT Output voltage VNEG -0.7 -1.5 -1.8 V CFLY External flying capacitor 1 μF CVBAT VBAT input capacitor 10 μF CVNEG VNEG output capacitor 10 μF |
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