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WM8281ECS/R 数据表(PDF) 374 Page - Cirrus Logic |
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WM8281ECS/R 数据表(HTML) 374 Page - Cirrus Logic |
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374 / 392 page  WM8281 374 Rev 4.0 MICROPHONE BIAS CIRCUIT The WM8281 is designed to interface easily with up to 6 analogue or 8 digital microphones. Each microphone requires a bias current (electret condenser microphones) or voltage supply (silicon microphones); these can be provided by the MICBIAS1, MICBIAS2 or MICBIAS3 regulators on the WM8281. Note that the MICVDD pin can also be used (instead of MICBIASn) as a reference or power supply for external microphones. The MICBIAS outputs are recommended, as these offer better noise performance and independent enable/disable control. Analogue microphones may be connected in single-ended or differential configurations, as illustrated in Figure 84. The differential configuration provides better performance due to its rejection of common-mode noise; the single-ended method provides a reduction in external component count. A bias resistor is required when using an electret condenser microphone (ECM). The bias resistor should be chosen according to the minimum operating impedance of the microphone and MICBIAS voltage so that the maximum bias current of the WM8281 is not exceeded. A 2.2k bias resistor is recommended; this provides compatibility with a wide range of microphone components. To ADC PGA VMID IN1xN, IN2xN, IN3xN IN1xP, IN2xP, IN3xP MIC GND MICBIAS To ADC PGA VMID IN1xN, IN2xN, IN3xN IN1xP, IN2xP, IN3xP MIC GND MICBIAS Figure 84 Single-Ended and Differential Analogue Microphone Connections Analogue MEMS microphones can be connected to the WM8281 as illustrated in Figure 85. In this configuration, the MICBIAS generators provide a low-noise supply for the microphones; a bias resistor is not required. To ADC PGA VREF IN1xN, IN2xN, IN3xN IN1xP, IN2xP, IN3xP MEMS Mic MICBIAS VDD OUT GND GND To ADC PGA VREF IN1xN, IN2xN, IN3xN IN1xP, IN2xP, IN3xP MEMS Mic MICBIAS VDD OUT-P GND GND OUT-N Figure 85 Single-Ended and Differential Analogue Microphone Connections |
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