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PDF WM8994 Data sheet ( Hoja de datos )
| Número de pieza | WM8994 | |
| Descripción | Multi-Channel Audio Hub CODEC | |
| Fabricantes | Wolfson Microelectronics | |
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WM8994
Multi-Channel Audio Hub CODEC for Smartphones
DESCRIPTION
FEATURES
The WM8994[1] is a highly integrated ultra-low power hi-fi
CODEC designed for smartphones and other portable devices
rich in multimedia features.
An integrated stereo class D/AB speaker driver and class W
headphone driver minimize power consumption during audio
playback.
The device requires only two voltage supplies, with all other
internal supply rails generated from integrated LDOs.
Stereo full duplex asynchronous sample rate conversion and
multi-channel digital mixing combined with powerful analogue
mixing allow the device to support a huge range of different
architectures and use cases.
A fully programmable parametric EQ provides speaker
compensation and a dynamic range controller can be used in
the ADC or DAC paths for maintaining a constant signal level,
maximizing loudness and protecting speakers against
overloading and clipping.
A smart digital microphone interface provides power regulation,
a low jitter clock output and decimation filters for up to four
digital microphones. A MIC activity detect with interrupt is
available.
Fully differential internal architecture and on-chip RF noise filters
ensure a very high degree of noise immunity. Active ground loop
noise rejection and DC offset correction help prevent pop noise
and suppress ground noise on the headphone outputs.
Hi-fi 24-bit 4-channel DAC and 2-channel ADC
100dB SNR during DAC playback (‘A’ weighted)
Smart MIC interface
- Power, clocking and data input for up to four digital MICs
- High performance analogue MIC interface
- MIC activity detect & interrupt allows processor to sleep
2W stereo (2 x 2W) class D/AB speaker driver
Capless Class W headphone drivers
- Integrated charge pump
- 5.3mW total power for DAC playback to headphones
4 Line outputs (single-ended or differential)
BTL Earpiece driver
Digital audio interfaces for multi-processor architecture
- Asynchronous stereo duplex sample rate conversion
- Powerful mixing and digital loopback functions
ReTuneTM Mobile 5-band, 6-channel parametric EQ
Programmable dynamic range controller
Dual FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8kHz to 96kHz
Active noise reduction circuits
- DC offset correction removes pops and clicks
- Ground loop noise cancellation
Integrated LDO regulators
72-ball W-CSP package (4.511 x 4.023 x 0.7mm)
APPLICATIONS
Smartphones and music phones
Portable navigation
Tablets
eBooks
Portable Media Players
WOLFSON MICROELECTRONICS plc
Production Data, April 2012, Rev 4.4
[1] This product is protected by Patents US 7,622,984, US 7,626,445,US 7,765,019 and GB 2,432,765
Copyright 2012 Wolfson Microelectronics plc
1 page  
Production Data
WM8994
EXAMPLE FLL SETTINGS............................................................................................................................................ 204
SAMPLE RATE CONVERSION ................................................................................... 205
SAMPLE RATE CONVERTER 1 (SRC1) ...................................................................................................................... 205
SAMPLE RATE CONVERTER 2 (SRC2) ...................................................................................................................... 205
SAMPLE RATE CONVERTER RESTRICTIONS .......................................................................................................... 205
SAMPLE RATE CONVERTER CONFIGURATION ERROR INDICATION ................................................................... 207
CONTROL INTERFACE............................................................................................... 208
SELECTION OF CONTROL INTERFACE MODE ......................................................................................................... 208
2-WIRE (I2C) CONTROL MODE ................................................................................................................................... 209
3-WIRE (SPI) CONTROL MODE................................................................................................................................... 212
4-WIRE (SPI) CONTROL MODE................................................................................................................................... 213
CONTROL WRITE SEQUENCER................................................................................ 214
INITIATING A SEQUENCE............................................................................................................................................ 214
PROGRAMMING A SEQUENCE .................................................................................................................................. 215
DEFAULT SEQUENCES ............................................................................................................................................... 218
LDO REGULATORS .................................................................................................... 224
POP SUPPRESSION CONTROL ................................................................................ 227
DISABLED LINE OUTPUT CONTROL.......................................................................................................................... 227
LINE OUTPUT DISCHARGE CONTROL ...................................................................................................................... 228
VMID REFERENCE DISCHARGE CONTROL.............................................................................................................. 228
INPUT VMID CLAMPS .................................................................................................................................................. 228
REFERENCE VOLTAGES AND MASTER BIAS ......................................................... 229
POWER MANAGEMENT ............................................................................................. 230
THERMAL SHUTDOWN .............................................................................................. 235
POWER ON RESET..................................................................................................... 236
QUICK START-UP AND SHUTDOWN ........................................................................ 238
SOFTWARE RESET AND DEVICE ID......................................................................... 239
REGISTER MAP ................................................................................................ 240
REGISTER BITS BY ADDRESS .................................................................................. 251
APPLICATIONS INFORMATION ...................................................................... 345
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 345
AUDIO INPUT PATHS................................................................................................................................................... 345
HEADPHONE OUTPUT PATH...................................................................................................................................... 346
EARPIECE DRIVER OUTPUT PATH............................................................................................................................ 347
LINE OUTPUT PATHS .................................................................................................................................................. 347
POWER SUPPLY DECOUPLING ................................................................................................................................. 348
CHARGE PUMP COMPONENTS ................................................................................................................................. 349
MICROPHONE BIAS CIRCUIT ..................................................................................................................................... 349
CLASS D SPEAKER CONNECTIONS .......................................................................................................................... 350
RECOMMENDED EXTERNAL COMPONENTS DIAGRAM ......................................................................................... 352
DIGITAL AUDIO INTERFACE CLOCKING CONFIGURATIONS................................. 353
PCB LAYOUT CONSIDERATIONS ............................................................................. 356
CLASS D LOUDSPEAKER CONNECTION .................................................................................................................. 356
PACKAGE DIMENSIONS.................................................................................. 357
IMPORTANT NOTICE ....................................................................................... 358
ADDRESS: ................................................................................................................... 358
REVISION HISTORY ......................................................................................... 359
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PD, April 2012, Rev 4.4
5
5 Page 
Production Data
PIN NO
A3
B1
A2
C3
B3
NAME
SPKMODE
SPKOUTLN
SPKOUTLP
SPKOUTRN
SPKOUTRP
POWER DOMAIN
DBVDD
SPKVDD1
SPKVDD1
SPKVDD2
SPKVDD2
GROUND DOMAIN
DGND
SPKGND1
SPKGND1
SPKGND2
SPKGND2
WM8994
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously
operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given
under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN MAX
Supply voltages (AVDD1, DBVDD)
Supply voltages (AVDD2, DCVDD, LDO2VDD)
Supply voltages (CPVDD)
Supply voltages (SPKVDD1, SPKVDD2, LDO1VDD)
-0.3V
-0.3V
-0.3V
-0.3V
+4.5V
+2.5V
+2.2V
+7.0V
Voltage range digital inputs (DBVDD domain)
Voltage range digital inputs (DMICDATn)
AGND - 0.3V
AGND - 0.3V
DBVDD + 0.3V
AVDD1 + 0.3V
Voltage range analogue inputs (AVDD1 domain)
Voltage range analogue inputs (LINEOUTFB)
Voltage range analogue inputs (HPOUT1FB)
AGND - 0.3V
AGND - 0.3V
AGND - 0.3V
AVDD1 + 0.3V
AVDD1 + 0.3V
AGND + 0.3V
Ground (DGND, CPGND, SPKGND1, SPKGND2, REFGND, HP2GND)
Operating temperature range, TA
Junction temperature, TJMAX
Storage temperature after soldering
AGND - 0.3V
-40ºC
-40ºC
-65ºC
AGND + 0.3V
+85ºC
+150ºC
+150ºC
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PD, April 2012, Rev 4.4
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8994.PDF ] | |
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