WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 153

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

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Pre-Production
RECOMMENDED EXTERNAL COMPONENTS
Notes:
1. Wolfson recommends 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 WM8959 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 WM8959. When this is not possible, filtering should be placed on the
speaker outputs close to the WM8959.
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.
MICBIAS
HANDSET
MIC
DVDD
(Melody Chip)
LINE INPUT
LINE INPUT
(FM Radio)
Vbatt
2k2
AVDD
2k2
CONTROL INTERFACE
(2, 3 or 4-wire via GPIO)
HEADSET
AUDIO INTERFACE
MIC
0.1 F
0.1 F
GPIO
4.7 F
4.7 F
1 F
1 F
1 F
1 F
1 F
1 F
1 F
1 F
4.7 F
AVDD
HPVDD
SPKVDD
DCVDD
DBVDD
MODE
CSB/ADDR
SCLK
SDIN
MCLK
BCLK
DACLRC
DACDAT
GPIO1
GPIO3/BCLK2
GPIO4/DACLRC2
GPIO5/DACDAT2
LIN1
LIN2
LIN3/GPI7
LIN4/RXN
RIN1
RIN2
RIN3/GPI8
RIN4/RXP
(Voice CODEC)
WM8959
BB
SPKGND
MICBIAS
HPGND
AGND
DGND
ROUT
LOUT
OUT3
OUT4
SPKP
SPKN
VMID
RON
ROP
LOP
LON
1 F
1 F
1 F
220 F
220 F
1 F
OUTPUTS
LINE
4.7 F
PP, May 2008, Rev 3.1
LOUDSPEAKER
EAR SPEAKER
16 or 32 OHM
AGND
HEADPHONES
16 or 32 OHM
8 OHM
4.7 F
WM8959
MICBIAS
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