WM8948 Datasheet, PDF (1/189 Pages) Wolfson Microelectronics plc – Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller

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WM8948
Stereo Low-Power CODEC with
Video Buffer and Touch Panel Controller
DESCRIPTION
FEATURES
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.
• 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
• 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)
APPLICATIONS
• 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