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WM1811A Datasheet(PDF) 315 Page - Wolfson Microelectronics plc |
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WM1811A Datasheet(HTML) 315 Page - Wolfson Microelectronics plc |
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315 / 328 page  Production Data WM1811A w PD, November 2013, Rev 4.1 315 Figure 85 Digital Microphone Connection The MICBIAS generators can each operate as a voltage regulator or in bypass mode. See “Analogue Input Signal Path” for details of the MICBIAS generators. In Regulator mode, the MICBIAS regulators are designed to operate without external decoupling capacitors. It is important that parasitic capacitances on the MICBIAS1 or MICBIAS2 pins do not exceed the specified limit in Regulator mode (see “Electrical Characteristics”). If the capacitive load on MICBIAS1 or MICBIAS2 exceeds the specified limit (eg. due to a decoupling capacitor or long PCB trace), then the respective generator must be configured in Bypass mode. The maximum output current is noted in the “Electrical Characteristics”. This limit must be observed on each MICBIAS output, especially if more than one microphone is connected to a single MICBIAS pin. Note that the maximum output current differs between Regulator mode and Bypass mode. The MICBIAS output voltage can be adjusted using register control in Regulator mode. |
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