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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8994ECS/R датащи(PDF) 356 Page - Cirrus Logic |
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WM8994ECS/R датащи(HTML) 356 Page - Cirrus Logic |
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356 / 363 page  WM8994 356 Rev 4.6 RECOMMENDED EXTERNAL COMPONENTS DIAGRAM Figure 94 provides a summary of recommended external components for WM8994. Note that this diagram does not include any components that are specific to the end application e.g. it does not include filtering on the speaker outputs (assume filterless class D operation), RF decoupling, or RF filtering for pins which connect to the external world i.e. headphone or speaker outputs. WM8994 AVDD1 AGND DCVDD CPVDD AVDD2 SPKVDD1/2 DGND CPGND SPKGND1/2 MCLK1 DACDAT1 LRCLK1 BCLK1 ADCDAT1 SDA SCLK IN1LP IN1RP IN2LN/DMICDAT1 IN2LP/VRXN IN1RN IN1LN IN2RP/VRXP IN2RN/DMICDAT2 MICBIAS1 VMIDC MICBIAS2 HPOUT2N HPOUT2P HPOUT1L HPOUT1FB HPOUT1R LINEOUT1N LINEOUT2P LINEOUT2N LINEOUT1P LINEOUTFB SPKOUTLN SPKOUTRP SPKOUTRN SPKOUTLP CPCA CPVOUTP CPVOUTN CPCB 2.2 F 2.2 F 2.2 F Loudspeaker Earpiece Speaker 4.7 F MICBIAS1 Headset 1 F 1 F 1 F 1 F 1 F 4.7 F 0.1 F 4.7 F 4.7 F Vbat 1.8V Audio Interface 1 Control Interface 1 F 1 F 1 F 1 F 0.1 F 0.1 F SPKMODE Loudspeaker 3.0V (from internal LDO) 1.0V (from internal LDO) GPIO2/MCLK2 Master Clocks ADCLRCLK1/GPIO1 GPIO5/DACDAT2 GPIO4/LRCLK2 GPIO3/BCLK2 GPIO7ADCDAT2 Audio Interface 2 GPIO6/ADCLRCLK2 GPIO8/DACDAT3 GPIO10/LRCLK3 GPIO11/BCLK3 GPIO9/ADCDAT3 Audio Interface 3 CS/ADDR LDO1ENA LDO2ENA LDO Control VREFC 1 F DMICCLK Digital MIC clock HP2GND LDO1VDD REFGND 0.1 F DBVDD LDO2VDD 1 F MICBIAS2 1 F 1 F 1 F 1 F Analogue Audio (Mic / Line) Inputs 4.7 F CIFMODE Note that the optimum input capacitance will vary according to the required frequency response and the applicable input impedance. Note that input capacitors are not required for connection to Digital Microphone (DMIC) components. Line Outputs (can be configured as Differential pairs or Stereo pairs). Note that the optimum output capacitance will vary according to the required frequency response. The ground feedback connection to LINEOUTFB is optional. (Note: HPOUT1FB ground connection close to headset jack) Speaker Mode Select 4.7 F 4.7 F 20 20 Figure 94 Recommended External Components Diagram |
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