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DESCRIPTION
The WM8946 is a highly integrated low power hi-fi CODEC
designed for portable devices such as digital still cameras.
Up to 6 analogue inputs may be connected; a 2-channel digital
microphone interface is also provided. Flexible output mixing
options support single-ended and differential configurations, with
outputs derived from the digital audio paths or from analogue
bypass paths. Twin stereo outputs or stereo line and mono BTL
headphone/speaker drive may be supported.
Flexible digital mixing and powerful DSP functions are available.
Programmable filters and other processes may be applied to the
ADC or DAC signal paths. The DSP functions include 3D-stereo
enhancement, 5 notch filters, 5-band EQ, dynamic range control
and the Wolfson ReTune™ feature.
The ReTune™ feature is a sophisticated digital filter that can
compensate for imperfect characteristics of the housing,
loudspeaker or microphone components in an application. The
ReTune™ algorithm can provide acoustic equalisation and
selective phase (delay) control of specific frequency bands.
The WM8946 is controlled via a I2C or SPI interface. Additional
functions include Digital beep generator, Video buffer,
programmable GPIO functions, Frequency Locked Loop (FLL)
for flexible clocking support and integrated LDO for low noise
supply regulation.
The WM8946 is supplied in 36-ball W-CSP package, ideal for
portable systems.
DCVDD
DBVDD
SPKVDD
VBIN
WM8946
Stereo Low-Power CODEC with Video Buffer
FEATURES
Hi-fi audio CODEC
- 94dB SNR during ADC recording (‘A’ weighted)
- 96dB SNR during DAC playback (‘A’ weighted)
6 analogue audio inputs
Integrated bias reference for electret microphones
2-channel digital microphone interface
Powerful digital mixing / DSP functions:
- 3D-stereo enhancement
- 5-notch filters
- 5-band equalizer (EQ)
- ReTune™ parametric filter
- Dynamic range control and noise gate
- Low-pass/High-pass filters
- Direct Form 1 (DF1) programmable digital filter
Digital beep generator
4 analogue audio outputs
Stereo line output
Mono BTL headphone/speaker output driver
I2S digital audio interface - sample rates 8kHz to 48kHz
Frequency Locked Loop (FLL) frequency conversion / filter
Video buffer function
Integrated LDO low-noise voltage regulator
36-ball W-CSP package (2.97 x 3.07 x 0.7mm, 0.5mm pitch)
APPLICATIONS
Digital Still Cameras (DSC)
Multimedia phones
VBREFR
VBOUT
CURRENT MODE
VIDEO BUFFER
W
WM8946
AUX1
AUX2
LINEOUTL
IN1L/DMICDAT
IN2L
Analogue Mic
Mux / PGA
ADC L
ADC /
Record
Digital
Filters
DSP Core
(3D surround,
Re-Tune EQ,
Dynamic Range
Control)
DAC L
-1
DAC
Digital
Filters
OUTPUT
MIXERS
LINEOUTR
SPKOUTL
IN1R
IN2R
Analogue Mic
Mux / PGA
ADC R
DAC R
-1
SPKOUTR
DMICDAT
DMICCLK
(GPIO)
Digital Mic
Interface
Digital Beep
Generator
DIGITAL AUDIO
INTERFACE
MICBIAS
Reference
LDO
FLL
CONTROL
INTERFACE
GPIO
LDOVOUT
LDOVDD
ADCDAT
DACDAT
LRCLK
BCLK
VMIDC
SDA
SCLK
CS/GPIO2
CIFMODE/GPIO3
SDOUT/GPIO4
WOLFSON MICROELECTRONICS plc
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Production Data, July 2012, Rev 4.3
Copyright
2012
Wolfson Microelectronics plc
GPIO1
MCLK
GND
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
