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WM8991 Datasheet(PDF) 170 Page - Wolfson Microelectronics plc |
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WM8991 Datasheet(HTML) 170 Page - Wolfson Microelectronics plc |
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170 / 174 page  WM8991 Pre-Production w PP, May 2008, Rev 3.1 170 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS Notes: 1. Wolfson recommend using a single, common ground reference. Where this is not possible care should be taken to optimise split ground configuration for audio performance. 2. Supply decoupling capacitors on DCVDD, DBVDD, SPKVDD, HPVDD and AVDD should be positioned as close to the WM8991 as possible. Values indicated are minimum requirements. 3. Capacitor types should be carefully chosen. Capacitors with very low ESR are recommended for optimum performance. 4. The loudspeaker should be connected as close as possible to the WM8991. When this is not possible, filtering should be placed on the speaker outputs close to the WM8991. 5. The 2k2 MICBIAS resistors on each of the MIC inputs are typical values and will be suitable for many electret type microphones. However, it is recommended that engineers refer to individual microphone specifications prior to finalising the value of this component. WM8991 AVDD DCVDD SPKVDD HPVDD DBVDD MODE SDIN SCLK CSB/ADDR MCLK DACDAT DACLRC BCLK ADCLRC/GPIO1 ADCDAT GPIO5/DACDAT2 GPIO4/DACLRC2 GPIO3/BCLK2 GPIO6/ADCLRCB GPIO2/MCLK2 LIN1 LIN4/RXN LIN3/GPI7 LIN2 RIN1 RIN4/RXP RIN3/GPI8 RIN2 AGND HPGND SPKGND DGND MICBIAS VMID LOP LON ROP RON SPKP SPKN OUT3 OUT4 LOUT ROUT BB (Voice CODEC) 1 F 1 F 1 F 1 F LINE OUTPUTS 1 F 1 F 220 F 220 F 8 OHM LOUDSPEAKER 16 or 32 OHM EAR SPEAKER 16 or 32 OHM HEADPHONES 4.7 F 4.7 F 4.7 F CONTROL INTERFACE (2, 3 or 4-wire via GPIO) AUDIO INTERFACE GPIO 4.7 F 4.7 F 0.1 F 0.1 F Vbatt DVDD AVDD 1 F 1 F 1 F 1 F 1 F 1 F LINE INPUT (FM Radio) LINE INPUT (Melody Chip) MICBIAS MICBIAS 2k2 2k2 HEADSET MIC HANDSET MIC AGND |
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