wm8945

Manufacturer Part Numberwm8945
DescriptionMono Low-power Codec With Video Buffer And Touch Panel Controller
ManufacturerWolfson Microelectronics plc
wm8945 datasheet
 
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Mono Low-Power CODEC with
Video Buffer and Touch Panel Controller
DESCRIPTION
The WM8945 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 WM8945 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 WM8945 is supplied in 36-ball W-CSP package, ideal for
portable systems.
DCVDD
DBVDD
XP
YN
TOUCH PANEL
INTERFACE
YP
XN
AUX1
AUX2
Analogue Mic
IN1L/DMICDAT
Mux / PGA
IN2L
DMICDAT
DMICCLK
(GPIO)
MICBIAS
Reference
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FEATURES
Hi-fi audio CODEC
-
-
4 analogue audio inputs
Integrated bias reference for electret microphones
Digital microphone interface
Powerful digital mixing / DSP functions:
-
-
-
-
-
-
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
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
SPKVDD
VBIN
CURRENT MODE
AUX ADC
VIDEO BUFFER
ADC L
DSP Core
ADC
(Re-Tune EQ,
Digital
Dynamic Range
Filters
Control)
Digital Mic
Interface
DIGITAL AUDIO
INTERFACE
LDO
http://www.wolfsonmicro.com/enews
WM8945
94dB SNR during ADC recording (‘A’ weighted)
98dB SNR during DAC playback (‘A’ weighted)
5-notch filters
5-band equalizer (EQ)
TM
ReTune
parametric filter
Dynamic range control and noise gate
Low-pass/High-pass filters
Direct Form 1 (DF1) programmable digital filter
VBREFR
VBOUT
W
WM8945
DAC L
OUTPUT
-1
MIXERS
DAC
Digital
Filters
Digital Beep
Generator
CONTROL
FLL
GPIO
INTERFACE
Product Brief, October 2009, Rev 1.1
Copyright ©2009 Wolfson Microelectronics plc
LINEOUTL
SPKOUTL
SPKOUTR

wm8945 Summary of contents

  • Page 1

    ... ReTune algorithm can provide acoustic cancellation and selective phase (delay) control of specific frequency bands. The WM8945 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

    ... WM8945 BLOCK DIAGRAM VBOUT VBREFR VBIN SPKVDD DBVDD DCVDD w Product Brief GPIO1 SDOUT/GPIO4 CIFMODE/GPIO3 CS/GPIO2 SCLK SDA MCLK BCLK LRCLK DACDAT ADCDAT LDOVDD LDOVOUT VMIDC GND MICBIAS Product Brief, October 2009, Rev 1.1 2 ...

  • Page 3

    ... Product Brief PIN CONFIGURATION The WM8945 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 WM8945ECS/R -40°C to +85°C ...

  • Page 4

    ... WM8945 PIN DESCRIPTION PIN NO NAME A1 SPKVDD A2 LDOVOUT A3 LDOVDD A4 VMIDC SPKOUTR B2 SPKOUTL B3 GND AUX1 C1 LINEOUTL C2 DNC C3 ADCDAT C4 MICBIAS C5 AUX2 C6 IN2L D1 VBREFR D2 VBOUT D3 CS ¯ ¯ /GPIO2 D4 IN1L/DMICDAT D5 DNC D6 DNC 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 WM8945 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

    ... WM8945 PACKAGE DIMENSIONS 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 0.500 BSC f1 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 WM8945 Product Brief, October 2009, Rev 1.1 7 ...