WM8958
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Multi-Channel Audio Hub CODEC for Smartphones
DESCRIPTION FEATURES
[1]
24-bit 4-channel hi-fi DAC and 2-channel hi-fi ADC
The WM8958 is a highly integrated ultra-low power hi-fi
100dB SNR during DAC playback (A weighted)
CODEC designed for smartphones and other portable devices
Smart MIC interface
rich in multimedia features.
- Power, clocking and data input for up to four digital MICs
An integrated stereo Class D/AB speaker driver and Class W
- High performance analogue MIC interface
headphone driver minimize power consumption during audio
- MIC activity detect & interrupt allows processor to sleep
playback.
- Impedance sensing for accessory / push-button detection
2W stereo (2 x 2W) Class D/AB speaker driver
The device requires only two voltage supplies, with all other
Capless Class W headphone drivers
internal supply rails generated from integrated LDOs.
- Integrated charge pump
Stereo full duplex asynchronous sample rate conversion and - 5.3mW total power for DAC playback to headphones
multi-channel digital mixing combined with powerful analogue 4 Line outputs (single-ended or differential)
mixing allow the device to support a huge range of different BTL Earpiece driver
architectures and use cases. Digital audio interfaces for multi-processor architecture
- Asynchronous stereo duplex sample rate conversion
A multiband compressor and programmable parametric EQ
- Powerful mixing and digital loopback functions
provide volume maximisation and speaker compensation in the TM
ReTune Mobile 5-band, 6-channel parametric EQ
digital playback paths. The dynamic range controller can be
Multiband compressor and dynamic range controller
used in record or playback paths for maintaining a constant
Dual FLL provides all necessary clocks
signal level, maximizing loudness and protecting speakers
- Self-clocking modes allow processor to sleep
against overloading and clipping.
- All standard sample rates from 8kHz to 96kHz
Active noise reduction circuits
A smart digital microphone interface provides power regulation,
- DC offset correction removes pops and clicks
a low jitter clock output and decimation filters for up to four
- Ground loop noise cancellation
digital microphones. Microphone activity detection with interrupt
Integrated LDO regulators
is available. Impedance sensing and measurement is provided
72-ball W-CSP package (4.516 x 4.258 x 0.698mm)
for external accessory / push-button detection.
Fully differential internal architecture and on-chip RF noise filters
APPLICATIONS
ensure a very high degree of noise immunity. Active ground loop
Smartphones and music phones
noise rejection and DC offset correction help prevent pop noise
Portable navigation
and suppress ground noise on the headphone outputs.
Tablets
eBooks
Portable Media Players
WOLFSON MICROELECTRONICS plc Pre-Production, March 2014, Rev 3.5
[1] This product is protected by Patents US 7,622,984, US 7,626,445, and GB 2,469,345
Copyright 2014 Wolfson Microelectronics plc WM8958 Pre-Production
TABLE OF CONTENTS
DESCRIPTION ................................................................................................................ 1
FEATURES ..................................................................................................................... 1
APPLICATIONS .............................................................................................................. 1
TABLE OF CONTENTS .................................................................................................. 2
BLOCK DIAGRAM ......................................................................................................... 7
PIN CONFIGURATION ................................................................................................... 8
ORDERING INFORMATION ........................................................................................... 8
PIN DESCRIPTION ......................................................................................................... 9
ABSOLUTE MAXIMUM RATINGS ............................................................................... 12
RECOMMENDED OPERATING CONDITIONS ............................................................ 13
THERMAL PERFORMANCE ........................................................................................ 14
ELECTRICAL CHARACTERISTICS ............................................................................ 15
INPUT SIGNAL LEVEL ............................................................................................................ 15
INPUT PIN RESISTANCE ........................................................................................................ 16
PROGRAMMABLE GAINS ....................................................................................................... 18
OUTPUT DRIVER CHARACTERISTICS ................................................................................. 19
ADC INPUT PATH PERFORMANCE ....................................................................................... 20
DAC OUTPUT PATH PERFORMANCE ................................................................................... 21
BYPASS PATH PERFORMANCE ............................................................................................ 24
MULTI-PATH CROSSTALK ..................................................................................................... 26
DIGITAL INPUT / OUTPUT ...................................................................................................... 28
DIGITAL FILTER CHARACTERISTICS ................................................................................... 28
MICROPHONE BIAS CHARACTERISTICS ............................................................................. 29
MISCELLANEOUS CHARACTERISTICS ................................................................................ 30
TERMINOLOGY ....................................................................................................................... 31
TYPICAL PERFORMANCE .......................................................................................... 32
TYPICAL POWER CONSUMPTION ........................................................................................ 32
TYPICAL SIGNAL LATENCY ................................................................................................... 33
SPEAKER DRIVER PERFORMANCE ..................................................................................... 34
SIGNAL TIMING REQUIREMENTS ............................................................................. 35
SYSTEM CLOCKS & FREQUENCY LOCKED LOOP (FLL) .................................................... 35
AUDIO INTERFACE TIMING ................................................................................................... 36
DIGITAL MICROPHONE (DMIC) INTERFACE TIMING ................................................................................................................ 36
DIGITAL AUDIO INTERFACE - MASTER MODE ......................................................................................................................... 37
DIGITAL AUDIO INTERFACE - SLAVE MODE ............................................................................................................................. 38
DIGITAL AUDIO INTERFACE - TDM MODE ................................................................................................................................ 39
CONTROL INTERFACE TIMING ............................................................................................. 40
DEVICE DESCRIPTION ............................................................................................... 41
INTRODUCTION ...................................................................................................................... 41
ANALOGUE INPUT SIGNAL PATH ......................................................................................... 43
MICROPHONE INPUTS ................................................................................................................................................................ 44
MICROPHONE BIAS CONTROL .................................................................................................................................................. 44
MICROPHONE ACCESSORY DETECT ....................................................................................................................................... 46
LINE AND VOICE CODEC INPUTS .............................................................................................................................................. 46
INPUT PGA ENABLE .................................................................................................................................................................... 47
INPUT PGA CONFIGURATION .................................................................................................................................................... 48
INPUT PGA VOLUME CONTROL ................................................................................................................................................. 49
INPUT MIXER ENABLE ................................................................................................................................................................. 52
INPUT MIXER CONFIGURATION AND VOLUME CONTROL ..................................................................................................... 52
PP, March 2014, Rev 3.5
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