WM8959 Datasheet, PDF (153/155 Pages) Wolfson Microelectronics plc – Mobile Multimedia DAC with Dual-Mode Class AB/D Speaker Driver

Pre-Production
RECOMMENDED EXTERNAL COMPONENTS
WM8959
DVDD Vbatt AVDD
0.1 F
0.1 F
4.7 F
4.7 F
4.7 F
AVDD
HPVDD
SPKVDD
DCVDD
DBVDD
WM8959
AGND
HPGND
SPKGND
DGND
CONTROL INTERFACE
(2, 3 or 4-wire via GPIO)
MICBIAS
AUDIO INTERFACE
2k2
2k2
GPIO
HANDSET
MIC
HEADSET
MIC
LINE INPUT
(FM Radio)
LINE INPUT
(Melody Chip)
MODE
CSB/ADDR
SCLK
SDIN
MCLK
BCLK
DACLRC
DACDAT
GPIO1
GPIO3/BCLK2
GPIO4/DACLRC2
GPIO5/DACDAT2
LIN1
1F
LIN2
1F
LIN3/GPI7
1F
LIN4/RXN
1F
RIN1
1F
RIN2
1F
RIN3/GPI8
1F
RIN4/RXP
1F
MICBIAS
VMID
LOUT
ROUT
OUT3
OUT4
SPKP
SPKN
ROP
RON
LOP
LON
BB
(Voice CODEC)
220 F
220 F
1F
1F
1F
1F
MICBIAS
4.7 F
4.7 F
AGND
16 or 32 OHM
HEADPHONES
16 or 32 OHM
EAR SPEAKER
8 OHM
LOUDSPEAKER
LINE
OUTPUTS
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.
w
PP, May 2008, Rev 3.1
153