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DESCRIPTION
The WM8711BL is an ultra-small, low power stereo DAC
with an integrated headphone driver. It is designed
specifically for portable audio systems requiring hi-fi stereo
playback through headphones.
Stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8kHz
to 96kHz are supported.
Stereo audio outputs are buffered for driving headphones
from a programmable volume control, line level outputs are
also provided along with anti-thump mute and power
up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
volume controls, mutes, de-emphasis and extensive power
management facilities. The device is available in an ultra-
small 24-lead QFN (4x4x0.9 mm Body) package.
A USB clocking mode is provided where all audio rates can
be derived from a single 12MHz or 24MHz MCLK, saving on
the need for a PLL or multiple crystals.
WM8711BL
Ultra-Small Audio DAC with Headphone Amplifier
FEATURES
•
•
Audio Performance
-
DAC SNR 97dB (‘A’ weighted) at AVDD = 3.3V
-
DAC SNR 90dB (‘A’ weighted) at AVDD = 1.8V
Low Power Headphone Playback
-
Down to 6mW at 1.8V
-
1.42 – 3.6V Digital Supply Operation
-
1.8 – 3.6 V Analogue Supply Operation
DAC Sampling Frequency: 8kHz – 96kHz
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
2
-
I S, Left, Right Justified or DSP
-
16/20/24/32 bit Word Lengths
-
Master or Slave Clocking Mode
Stereo Audio Outputs
Output Volume and Mute Controls
Highly Efficient Headphone Driver
24-lead QFN (4x4x0.9 mm) package
•
•
•
•
•
•
•
APPLICATIONS
•
•
Multimedia Mobile Phones
Portable MP3 / CD Players
BLOCK DIAGRAM
MODE
SCLK
SDIN
CSB
AGND
AVDD
VMID
W
WM8711B
HPVDD
CONTROL INTERFACE
HPGND
RLINEIN
MUTE
VOL/
MUTE
H/P
DRIVER
RHPOUT
DACDAT
DACLRC
DIGTAL AUDIO INTERFACE
DAC
+6 to -73dB
1 dB Steps
ROUT
DIGITAL
FILTERS
LOUT
DAC
+6 to -73dB
1 dB Steps
VOL/
MUTE
MUTE
OSC
CLKIN
DIVIDER
(Div x1,
x2)
CLKIN
DIVIDER
(Div x1,
x2)
BCLK
H/P
DRIVER
LHPOUT
LLINEIN
DCVDD
(1.5V)
DBVDD
(3.3V)
XTI/MCLK
WOLFSON MICROELECTRONICS plc
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CLKOUT
DGND
XTO
Production Data, April 2007, Rev 4.1
Copyright
©2007
Wolfson Microelectronics plc
WM8711BL
Production Data
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES ............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................1
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
PIN DESCRIPTION ................................................................................................4
ABSOLUTE MAXIMUM RATINGS.........................................................................5
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY .....................................................................................................7
POWER CONSUMPTION ......................................................................................8
HEADPHONE SNR VS AVDD ...............................................................................9
ANALOGUE SUPPLY CURRENT VS AVDD.........................................................9
DIGITAL AUDIO INTERFACE – MASTER MODE........................................................ 10
DIGITAL AUDIO INTERFACE – SLAVE MODE ........................................................... 11
MPU INTERFACE TIMING........................................................................................... 11
DEVICE DESCRIPTION .......................................................................................13
INTRODUCTION.......................................................................................................... 13
AUDIO SIGNAL PATH ................................................................................................. 14
DEVICE OPERATION.................................................................................................. 19
AUDIO DATA SAMPLING RATES ............................................................................... 27
ACTIVATING DSP AND DIGITAL AUDIO INTERFACE ............................................... 30
SOFTWARE CONTROL INTERFACE.......................................................................... 30
POWER DOWN MODES ............................................................................................. 32
REGISTER MAP .......................................................................................................... 34
DAC FILTER RESPONSES .................................................................................38
DIGITAL DE-EMPHASIS CHARACTERISTICS ..................................................40
RECOMMENDED EXTERNAL COMPONENTS ..................................................41
PACKAGE DIMENSIONS – QFN.........................................................................42
IMPORTANT NOTICE ..........................................................................................43
ADDRESS:................................................................................................................... 43
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Production Data
WM8711BL
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
TEMPERATURE
AVDD RANGE
RANGE
PACKAGE
MOISTURE SENSITIVITY
LEVEL
PEAK SOLDERING
TEMPERATURE
WM8711BLGEFL/V
-25 to 85
o
C
1.8 to 3.6V
24-lead QFN
(Pb-free)
24-lead QFN
(Pb-free, tape and
reel)
MSL3
260
o
C
WM8711BLGEFL/RV
Note:
Reel quantity = 3500
-25 to 85 C
o
1.8 to 3.6V
MSL3
260
o
C
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WM8711BL
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Note:
1.
2.
Pull Up/Down only present when Control Register Interface ACTIVE=0 to conserve power.
It is recommended that the QFN ground paddle is connected to analogue ground on the application PCB.
NAME
XTI/MCLK
XTO
DCVDD
DGND
DBVDD
CLKOUT
BCLK
DACDAT
DACLRC
HPVDD
LHPOUT
RHPOUT
HPGND
LOUT
ROUT
AVDD
AGND
VMID
RLINEIN
LLINEIN
MODE
CSB
SDIN
SCLK
TYPE
Digital Input
Digital Output
Supply
Ground
Supply
Digital Output
Digital Input/Output
Digital Input
Digital Input/Output
Supply
Analogue Output
Analogue Output
Ground
Analogue Output
Analogue Output
Supply
Ground
Analogue Output
Analogue Input
Analogue Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
Crystal Output
Digital Core VDD
Digital GND
Digital Buffers VDD
Buffered Clock Output
Digital Audio Bit Clock, Pull Down (see Note 1)
DAC Digital Audio Data Input
DESCRIPTION
Crystal Input or Master Clock Input (MCLK)
Production Data
DAC Sample Rate Left/Right Clock, Pull Down (see Note 1)
Headphone VDD
Left Channel Headphone Output
Right Channel Headphone Output
Headphone GND
Left Channel Line Output
Right Channel Line Output
Analogue VDD
Analogue GND
Mid-rail reference decoupling point
Right Channel Line Input (AC coupled)
Left Channel Line Input (AC coupled)
Control Interface Selection, Pull up (see Note 1)
3-Wire MPU Chip Select/ 2-Wire MPU interface address
selection, active low, Pull up (see Note 1)
3-Wire MPU Data Input / 2-Wire MPU Data Input
3-Wire MPU Clock Input / 2-Wire MPU Clock Input
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Production Data
WM8711BL
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.
CONDITION
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, T
A
Storage temperature after soldering
Notes:
1.
2.
3.
Analogue and digital grounds must always be within 0.3V of each other.
The digital supply core voltage (DCVDD) must always be less than or equal to the analogue supply voltage (AVDD)
DCVDD must always be less than or equal to DBVDD
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
MAX
+3.63V
+3.63V
DVDD +0.3V
AVDD +0.3V
+85°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supply range
Ground
SYMBOL
DCVDD
DBVDD
AVDD, HPVDD
DGND,AGND,HPGND
TEST CONDITIONS
MIN
1.42
1.8
1.8
0
TYP
MAX
3.6
3.6
3.6
UNIT
V
V
V
V
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Embedded System
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