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Wolfson Microelectronics

WM8955BL Datasheet Preview

WM8955BL Datasheet

Stereo DAC

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WM8955BL
Stereo DAC For Portable Audio Applications
DESCRIPTION
FEATURES
The WM8955BL is a low power, high quality stereo DAC with
integrated headphone and earpiece amplifiers, designed to
reduce external component requirements in portable digital
audio applications.
The on-chip headphone amplifiers can deliver 40mW into a 16Ω
load. Advanced on-chip digital signal processing performs bass
and treble tone control.
The WM8955BL can operate as a master or a slave, and
includes an on-chip PLL. It can use most master clock
frequencies commonly found in portable systems, including
USB, GSM, CDMA or PDC clocks, or standard 256fs clock rates.
Different audio sample rates such as 48kHz, 44.1kHz, 8kHz and
many others are supported.
The WM8955BL operates on supply voltages from 1.8V up to
3.6V, although the digital core can operate on a separate supply
down to 1.42V, saving power. Different sections of the chip can
also be powered down under software control.
The WM8955BL is supplied in a very small and thin 4x4mm
QFN package, ideal for use in hand-held and portable systems.
DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V)
On-chip Headphone Driver
- 40mW output power on 16Ω / 3.3V
- SNR 96dB, THD –79dB at 20mW with 16Ω load
On-chip BTL Earpiece Driver (mono)
Stereo and Mono Line-in mix into DAC output
Separately Mixed Stereo and Mono Outputs
Digital Tone Control and Bass Boost
Low Power
- Down to 7mW for stereo playback (1.8V / 1.5V supplies)
- 10μW Shutdown Mode
Low Supply Voltages
- Analogue and Digital I/O: 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
Master clocks supported: GSM, CDMA, PDC, USB or
standard audio clocks
Audio sample rates supported: 8, 11.025, 12, 16, 22.05, 24,
32, 44.1, 48, 88.2, 96kHz
28-lead QFN package, 4x4x0.75mm size
Software compatible with WM8750L, WM8751L, WM8955L
APPLICATIONS
www.DataSheet4U.coSmmartphone / Multimedia Phone
Digital Audio Player
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/
Production Data, February 2007, Rev 4.1
Copyright ©2007 Wolfson Microelectronics plc




Wolfson Microelectronics

WM8955BL Datasheet Preview

WM8955BL Datasheet

Stereo DAC

No Preview Available !

WM8955BL
Production Data
TABLE OF CONTENTS
DESCRIPTION....................................................................................................... 1
FEATURES ............................................................................................................ 1
APPLICATIONS..................................................................................................... 1
BLOCK DIAGRAM ................................................................................................ 1
TABLE OF CONTENTS......................................................................................... 2
PIN CONFIGURATION .......................................................................................... 3
ORDERING INFORMATION.................................................................................. 3
PIN DESCRIPTION................................................................................................ 4
ABSOLUTE MAXIMUM RATINGS ........................................................................ 5
RECOMMENDED OPERATING CONDITIONS..................................................... 5
ELECTRICAL CHARACTERISTICS ..................................................................... 6
TERMINOLOGY ............................................................................................................... 7
OUTPUT PGA’S LINEARITY ........................................................................................... 8
HEADPHONE OUTPUT THD VERSUS POWER ............................................................ 9
POWER CONSUMPTION .............................................................................................. 10
AUDIO PATHS OVERVIEW ................................................................................ 11
SIGNAL TIMING REQUIREMENTS .................................................................... 12
SYSTEM CLOCK TIMING.............................................................................................. 12
AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 12
AUDIO INTERFACE TIMING – SLAVE MODE.............................................................. 13
CONTROL INTERFACE TIMING – 3-WIRE MODE....................................................... 13
CONTROL INTERFACE TIMING – 2-WIRE MODE....................................................... 14
INTERNAL POWER ON RESET CIRCUIT .......................................................... 15
DEVICE DESCRIPTION ...................................................................................... 16
INTRODUCTION ............................................................................................................ 16
SIGNAL PATH................................................................................................................ 16
LINE INPUTS AND OUTPUT MIXERS .......................................................................... 20
ANALOGUE OUTPUTS ................................................................................................. 23
DIGITAL AUDIO INTERFACE........................................................................................ 26
MASTER CLOCK AND PHASE LOCKED LOOP........................................................... 29
AUDIO SAMPLE RATES................................................................................................ 31
CONTROL INTERFACE................................................................................................. 33
POWER SUPPLIES ....................................................................................................... 34
POWER MANAGEMENT ............................................................................................... 35
REGISTER MAP .................................................................................................. 37
DIGITAL FILTER CHARACTERISTICS .............................................................. 38
TERMINOLOGY ............................................................................................................. 38
DAC FILTER RESPONSES ........................................................................................... 38
APPLICATIONS INFORMATION ........................................................................ 40
RECOMMENDED EXTERNAL COMPONENTS ............................................................ 40
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS.......................................... 41
LINE OUTPUT CONFIGURATION................................................................................. 41
HEADPHONE OUTPUT CONFIGURATION.................................................................. 42
EARPIECE OUTPUT CONFIGURATION ...................................................................... 42
PACKAGE DIMENSIONS.................................................................................... 43
IMPORTANT NOTICE ......................................................................................... 44
ADDRESS: ..................................................................................................................... 44
w
PD Rev 4.1 February 2007
2


Part Number WM8955BL
Description Stereo DAC
Maker Wolfson Microelectronics
Total Page 30 Pages
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