wm8948 Wolfson Microelectronics plc, wm8948 Datasheet

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wm8948

Manufacturer Part Number
wm8948
Description
Stereo Low-power Codec With Video Buffer And Touch Panel Controller
Manufacturer
Wolfson Microelectronics plc
Datasheet
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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 and DAC signal paths simultaneously. The DSP
functions include 3D-stereo enhancement, notch filters, 5-band
EQ, dynamic range control and the Wolfson ReTune™ feature.
The ReTune
compensate for imperfect characteristics of the housing,
loudspeaker or microphone components in an application. The
ReTune
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.
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WOLFSON MICROELECTRONICS plc
TM
algorithm can provide acoustic cancellation and
TM
feature is a sophisticated digital filter that can
Video Buffer and Touch Panel Controller
Stereo Low-Power CODEC with
at
http://www.wolfsonmicro.com/enews
FEATURES
APPLICATIONS
Hi-fi audio CODEC
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6 analogue audio inputs
Integrated bias reference for electret microphones
2-channel digital microphone interface
Powerful digital mixing / DSP functions:
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-
-
-
-
-
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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)
Digital Still Cameras (DSC)
Multimedia phones
94dB SNR during ADC recording (‘A’ weighted)
98dB SNR during DAC playback (‘A’ weighted)
3D-stereo enhancement
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
TM
parametric filter
Copyright ©2009 Wolfson Microelectronics plc
Product Brief, October 2009, Rev 1.1
WM8948

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wm8948 Summary of contents

Page 1

... ReTune algorithm can provide acoustic cancellation 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 ...

Page 2

... WM8948 BLOCK DIAGRAM w Product Brief Product Brief, October 2009, Rev 1.1 2 ...

Page 3

... Product Brief PIN CONFIGURATION The WM8948 is supplied in a 36-pin CSP format. The pin configuration is illustrated below, showing the top-down view from above the chip SPKVDD B SPKOUTR C LINEOUTL D VBREFR E VBIN F MCLK ORDERING INFORMATION ORDER CODE TEMPERATURE RANGE WM8948ECS/R -40°C to +85°C ...

Page 4

... WM8948 PIN DESCRIPTION PIN NO NAME A1 SPKVDD A2 LDOVOUT A3 LDOVDD A4 VMIDC SPKOUTR B2 SPKOUTL B3 GND AUX1 C1 LINEOUTL C2 LINEOUTR C3 ADCDAT C4 MICBIAS C5 AUX2 C6 IN2L D1 VBREFR D2 VBOUT D3 CS ¯ ¯ /GPIO2 D4 IN1L/DMICDAT D5 IN1R D6 IN2R E1 VBIN E2 BCLK E3 LRCLK E4 SDOUT/GPIO4 E5 DCVDD E6 SDA F1 MCLK F2 DACDAT F3 GPIO1 ...

Page 5

... Storage temperature after soldering RECOMMENDED OPERATING CONDITIONS PARAMETER Digital supply range (Core) Digital supply range (I/O) Analogue supply Speaker supply range Ground w SYMBOL MIN DCVDD 1.71 DBVDD 1.71 LDOVDD 2.4 SPKVDD 1.71 GND WM8948 MIN MAX -0.3V 2.5V -0.3V 4.5V -0.3V DBVDD +0.7V -0.3V LDOVDD +0.7V -40ºC +85ºC -40ºC +150ºC -65ºC +150ºC TYP MAX UNIT 1 ...

Page 6

... WM8948 PACKAGE DIMENSIONS - CSP B: 36 BALL W-CSP PACKAGE 2.960 DETAIL 2 BOTTOM VIEW bbb Dimensions (mm) Symbols NOM MIN A 0.615 0.7 0.219 0.244 A1 A2 0.361 0.386 2.960 BSC D D1 2.500 BSC E 3.060 BSC E1 2.500 BSC e 0 ...

Page 7

... Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w WM8948 Product Brief, October 2009, Rev 1.1 7 ...

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