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PDF WM8955BL Data sheet ( Hoja de datos )
| Número de pieza | WM8955BL | |
| Descripción | Stereo DAC | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM8955BL (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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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.DataShee•t4U.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
1 page  
Production Data
WM8955BL
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously
operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given
under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN
Supply voltages
Voltage range digital inputs
-0.3V
DGND -0.3V
Voltage range analogue inputs
AGND -0.3V
Operating temperature range, TA
Storage temperature after soldering
-25°C
-65°C
Notes
1. Analogue and digital grounds must always be within 0.3V of each other.
2. All digital and analogue supplies are completely independent from each other.
MAX
+4.5V
DBVDD +0.3V
AVDD +0.3V
+85°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supplies range
Ground
SYMBOL
DCVDD
DBVDD
AVDD, HPVDD
DGND, AGND, HPGND
TEST CONDITIONS
MIN
1.42
1.71
1.8
TYP
MAX
UNIT
3.6 V
3.6 V
3.6 V
0V
Notes
1. The DCVDD voltage must be lower than or equal to the DBVDD voltage.
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PD Rev 4.1 February 2007
5
5 Page 
Production Data
AUDIO PATHS OVERVIEW
WM8955BL
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PD Rev 4.1 February 2007
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8955BL.PDF ] | |
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