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DESCRIPTION
The WM8948 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 WM8948 is controlled via a I2C or SPI interface. Additional
functions include 4-wire Touch Panel controller, 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 WM8948 is supplied in 36-ball W-CSP package, ideal for
portable systems.
WM8948
Stereo Low-Power CODEC with
Video Buffer and Touch Panel Controller
FEATURES
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Hi-fi audio CODEC
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94dB SNR during ADC recording (‘A’ weighted)
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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:
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3D-stereo enhancement
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5-notch filters
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5-band equalizer (EQ)
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ReTune™ parametric filter
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Dynamic range control and noise gate
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Low-pass/High-pass filters
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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
4-wire Touch Panel interface controller
Auxiliary ADC for DC measurement or battery monitoring
Integrated LDO low-noise voltage regulator
36-ball W-CSP package (2.96 x 3.06 x 0.7mm, 0.5mm pitch)
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APPLICATIONS
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Digital Still Cameras (DSC)
Multimedia phones
WOLFSON MICROELECTRONICS plc
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Production Data, May 2011, Rev 4.1
Copyright
©2011
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
