Document Outline
- WM8726
- DESCRIPTION
- FEATURES
- APPLICATIONS
- BLOCK DIAGRAM
- TABLE OF CONTENTS
- PIN CONFIGURATION
- ORDERING INFORMATION
- PIN DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DC ELECTRICAL CHARACTERISTICS
- ELECTRICAL CHARACTERISTICS
- TERMINOLOGY
- MASTER CLOCK TIMING
- DIGITAL AUDIO INTERFACE
- DEVICE DESCRIPTION
- GENERAL INTRODUCTION
- DAC CIRCUIT DESCRIPTION
- CLOCKING SCHEMES
- DIGITAL AUDIO INTERFACE
- AUDIO DATA SAMPLING RATES
- HARDWARE CONTROL MODES
- DIGITAL FILTER CHARACTERISTICS
- DAC FILTER RESPONSES
- DIGITAL DE-EMPHASIS CHARACTERISTICS
- APPLICATIONS INFORMATION
- RECOMMENDED EXTERNAL COMPONENTS
- RECOMMENDED EXTERNAL COMPONENTS VALUES
- RECOMMENDED ANALOGUE LOW PASS FILTER
- PCB LAYOUT RECOMMENDATIONS
- PACKAGE DRAWING
- IMPORTANT NOTICE
- ADDRESS:
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WM8726
24-bit 192kHz Stereo DAC
WOLFSON MICROELECTRONICS plc
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http://www.wolfsonmicro.com/enews/
Production Data, September 2005, Rev 4.1
Copyright
2005 Wolfson Microelectronics plc
DESCRIPTION
The WM8726 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8726 supports data input word
lengths from 16 to 24-bits and sampling rates up to 192kHz.
The WM8726 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and
stereo DAC in a 14-lead SOIC package.
The WM8726 has a hardware control interface for selection
of audio data interface format, mute and de-emphasis. The
WM8726 supports I
2
S, right Justified or DSP interfaces.
The WM8726 is an ideal device to interface to AC-3
,
DTS
, and MPEG audio decoders for surround sound
applications, or for use in DVD players, including supporting
the implementation of 2 channels at 192kHz for high-end
DVD-Audio applications.
FEATURES
Stereo
DAC
Audio
Performance
-
100dB SNR (`A' weighted @ 48kHz)
- -88dB
THD
DAC Sampling Frequency: 8kHz 192kHz
Pin Selectable Audio Data Interface Format
-
I
2
S, 16-bit Right Justified or DSP
2.7V - 5.5V Supply Operation
14-lead SOIC Package
Pin Compatible with WM8725
APPLICATIONS
DVD
Players
Home
Theatre
Systems
Digital
TV
Digital Set Top Boxes
BLOCK DIAGRAM
W
WM8726
BCKIN
AUDIO
INTERFACE
MUTE
CONTROL
INTERFACE
VOUTL
VOUTR
LRCIN
DIN
MUTE
DIGITAL
FILTERS
MCLK
DEEMPH
MUTE
FORMAT
CAP
RIGHT
DAC
LEFT
DAC
GND
VDD
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
WM8726
Production Data
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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
DC ELECTRICAL CHARACTERISTICS .....................................................................6
ELECTRICAL CHARACTERISTICS ...........................................................................6
TERMINOLOGY ................................................................................................................. 7
MASTER CLOCK TIMING .................................................................................................. 8
DIGITAL AUDIO INTERFACE ............................................................................................ 8
DEVICE DESCRIPTION ..............................................................................................9
GENERAL INTRODUCTION .............................................................................................. 9
DAC CIRCUIT DESCRIPTION ........................................................................................... 9
CLOCKING SCHEMES .....................................................................................................10
DIGITAL AUDIO INTERFACE ...........................................................................................10
AUDIO DATA SAMPLING RATES.....................................................................................12
HARDWARE CONTROL MODES .....................................................................................13
DIGITAL FILTER CHARACTERISTICS ....................................................................15
DAC FILTER RESPONSES...............................................................................................15
DIGITAL DE-EMPHASIS CHARACTERISTICS.................................................................16
APPLICATIONS INFORMATION ..............................................................................17
RECOMMENDED EXTERNAL COMPONENTS ................................................................17
RECOMMENDED EXTERNAL COMPONENTS VALUES .................................................17
RECOMMENDED ANALOGUE LOW PASS FILTER ........................................................18
PCB LAYOUT RECOMMENDATIONS ..............................................................................18
PACKAGE DRAWING...............................................................................................19
IMPORTANT NOTICE ...............................................................................................20
ADDRESS: ........................................................................................................................20
WM8726
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3
PIN CONFIGURATION
10
9
8
14
13
12
11
WM8726
5
6
7
1
2
3
4
VDD
VOUTL
MUTE
NC
DEEMPH
MCLK
FORMAT
GND
VOUTR
CAP
NC
BCKIN
LRCIN
DIN
ORDERING INFORMATION
DEVICE
TEMPERATURE
RANGE
PACKAGE
MOISTURE
SENSITIVITY LEVEL
PEAK SOLDERING
TEMPERATURE
WM8726GED/V
-25 to +85
o
C
14-lead SOIC
(Pb-free)
MSL2 260
o
C
WM8726GED/RV
-25 to +85
o
C
14-lead SOIC
(Pb-free, tape and reel)
MSL2 260
o
C
Notes:
Reel quantity = 3,000
WM8726
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PIN DESCRIPTION
PIN NAME
TYPE
DESCRIPTION
1
LRCIN
Digital input
Sample rate clock input
2
DIN
Digital input
Serial audio data input
3
BCKIN
Digital input
Bit clock input
4
NC
No connect
No internal connection
5
CAP
Analogue output
Analogue internal reference
6
VOUTR
Analogue output
Right channel DAC output
7 GND
Supply
Negative
supply
8
VDD Supply
Positive
supply
9
VOUTL
Analogue output
Left channel DAC output
10
MUTE
Digital input
Soft mute control, Internal pull down
High Impedance = Automute
High = Mute ON
Low = Mute OFF
11
NC
No connect
No internal connection
12
DEEMPH
Digital input
De-emphasis select, Internal pull up
High = de-emphasis ON
Low = de-emphasis OFF
13
FORMAT
Digital input
Data input format select, Internal pull up
Low = 16-bit right justified or DSP `late'
High = 16-24-bit I
2
S or DSP `early'
14
MCLK
Digital input
Master clock input
Note:
1.
Digital input pins have Schmitt trigger input buffers.
WM8726
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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 MAX
Supply voltage
-0.3V +7V
Voltage range digital inputs
GND -0.3V
VDD +0.3V
Master Clock Frequency
50MHz
Operating temperature range, T
A
-25
C +85
C
Storage temperature after soldering
-65
C +150
C
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