wm8944

Manufacturer Part Numberwm8944
DescriptionMono Low-power Codec With Video Buffer
ManufacturerWolfson Microelectronics plc
wm8944 datasheet
 
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Mono Low-Power CODEC with Video Buffer
DESCRIPTION
The WM8944 is a highly integrated low power hi-fi CODEC
designed for portable devices such as digital still cameras.
Up to 4 analogue inputs may be connected; a digital
microphone interface is also provided. Flexible output mixing
options support single-ended and differential configurations,
with outputs derived from the digital audio or analogue bypass
paths. Mono line and BTL headphone/speaker output can be
supported.
Flexible digital mixing and powerful DSP functions are available.
Programmable filters and other processes may be applied to
the ADC and DAC signal paths simultaneously. The DSP
functions include notch filters, 5-band EQ, dynamic range
control and the Wolfson ReTune™ feature.
TM
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
TM
ReTune
algorithm can provide acoustic cancellation and
selective phase (delay) control of specific frequency bands.
The WM8944 is controlled via a I2C or SPI interface. Additional
functions include Auxiliary ADC, 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 WM8944 is supplied in 36-ball W-CSP package, ideal for
portable systems.
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FEATURES
Hi-fi audio CODEC
-
94dB SNR during ADC recording (‘A’ weighted)
-
98dB SNR during DAC playback (‘A’ weighted)
4 analogue audio inputs
Integrated bias reference for electret microphones
Digital microphone interface
Powerful digital mixing / DSP functions:
-
5-notch filters
-
5-band equalizer (EQ)
-
ReTune
-
Dynamic range control and noise gate
-
Low-pass/High-pass filters
-
Direct Form 1 (DF1) programmable digital filter
Digital beep generator
3 analogue audio outputs
Mono 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 (2.96 x 3.06 x 0.7mm, 0.5mm pitch)
APPLICATIONS
Digital Still Cameras (DSC)
Multimedia phones
http://www.wolfsonmicro.com/enews
WM8944
TM
parametric filter
Product Brief, October 2009, Rev 1.1
Copyright ©2009 Wolfson Microelectronics plc