WM8946 Datasheet, PDF (1/175 Pages) Wolfson Microelectronics plc – Stereo Low-Power CODEC with Video Buffer

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WM8946
Stereo Low-Power CODEC with Video Buffer
DESCRIPTION
FEATURES
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.
 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
DCVDD DBVDD
SPKVDD
VBIN
VBREFR VBOUT
CURRENT MODE
VIDEO BUFFER
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WM8946
AUX1
AUX2
IN1L/DMICDAT
IN2L
Analogue Mic
Mux / PGA
IN1R
IN2R
Analogue Mic
Mux / PGA
DMICDAT
DMICCLK
(GPIO)
Digital Mic
Interface
ADC L
ADC R
ADC /
Record
Digital
Filters
DSP Core
(3D surround,
Re-Tune EQ,
Dynamic Range
Control)
DAC
Digital
Filters
DAC L
-1
DAC R
-1
Digital Beep
Generator
OUTPUT
MIXERS
LINEOUTL
LINEOUTR
SPKOUTL
SPKOUTR
MICBIAS
Reference
LDO
DIGITAL AUDIO
INTERFACE
FLL
CONTROL
INTERFACE
GPIO
WOLFSON MICROELECTRONICS plc
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Production Data, July 2012, Rev 4.3
Copyright 2012 Wolfson Microelectronics plc