Document Outline
- WM8759
- 24-bit 192kHz Stereo DAC with Headphone Buffer
- DESCRIPTION
- FEATURES
- APPLICATIONS
- BLOCK DIAGRAM
- TABLE OF CONTENTS
- PIN CONFIGURATION
- ORDERING INFORMATION
- PIN DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DC ELECTRICAL CHARACTERISTICS
- ELECTRICAL CHARACTERISTICS
- 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
- POWER UP/DOWN SEQUENCE
- PCB LAYOUT RECOMMENDATIONS
- PACKAGE DRAWING
- IMPORTANT NOTICE
- ADDRESS:
w
WM8759
24-bit 192kHz Stereo DAC with Headphone Buffer
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Advanced Information, September 2004, Rev 3.0
Copyright
2004 Wolfson Microelectronics plc
DESCRIPTION
The WM8759 is a high performance stereo DAC with an
integrated headphone driver. It is designed for audio
applications such as portable DVD, MP3 players or
consumer equipment with line output and headphone output
connections.
The WM8759 supports data input word lengths from 16 to
24-bits and sampling rates up to 192kHz. The WM8759
consists of a serial interface port, digital interpolation filters,
multi-bit sigma delta modulators and stereo DAC in a 14-pin
SOIC package.
The hardware control interface is used for the selection of
audio data interface format, enable and de-emphasis. The
WM8759 supports I
2
S, right Justified or DSP interfaces.
Operating on split analog digital supplies the WM8759
allows very lower power consumption from the digital
section, whilst supporting large output powers from the
analog headphone driver.
FEATURES
Stereo DAC with headphone driver
50mW power into 16R load on 3.3V supply
Audio Performance
-
100dB SNR (`A' weighted @ 48kHz)
-
-88dB THD line level
-
-72dB THD headphone
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, Split Analog-digital supplies
14-pin SOIC Package
Typical power consumption 20mW on 2.7V supply
APPLICATIONS
Portable music Players
Home music players
Digital TV
BLOCK DIAGRAM
WM8759
Advanced Information
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AI Rev 3.0 September 2004
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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
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.............................................................................14
DAC FILTER RESPONSES...............................................................................................14
DIGITAL DE-EMPHASIS CHARACTERISTICS ........................................................15
APPLICATIONS INFORMATION ..............................................................................16
RECOMMENDED EXTERNAL COMPONENTS .......................................................16
POWER UP/DOWN SEQUENCE......................................................................................16
PCB LAYOUT RECOMMENDATIONS ..............................................................................17
PACKAGE DRAWING...............................................................................................18
IMPORTANT NOTICE ...............................................................................................19
ADDRESS: ........................................................................................................................19
Advanced Information
WM8759
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PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
TEMPERATURE
RANGE
PACKAGE
MOISTURE SENSITIVITY
LEVEL
PEAK SOLDERING
TEMPERATURE
WM8759ED/V
-25 to +85
o
C
14-pin SOIC
MSL2
240C
WM8759ED/RV
-25 to +85
o
C
14-pin SOIC
(tape and reel)
MSL2
240C
WM8759GED/V
-25 to +85
o
C
14-pin SOIC
(lead free)
MSL2
260C
WM8759GED/RV
-25 to +85
o
C
14-pin SOIC
(lead free,
tape and reel)
MSL2
260C
Note:
Reel quantity = 3,000
WM8759
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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
ENABLE
Digital input
Enable input 0 = powered down, 1 = enabled
5
CAP
Analogue output
Analogue internal reference
6
HPOUTR
Analogue output
Right channel DAC output
7
AGND
Supply
Ground reference for analog circuits and substrate connection
8
AVDD
Supply
Positive supply for analog circuits
9
HPOUTL
Analogue output
Left channel DAC output
10
DGND
Digital Supply
Digital ground supply
11
DVDD
Digital Supply
Digital positive supply
12
DEEMPH
Digital input
De-emphasis select, Internal pull down
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.
Advanced Information
WM8759
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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 prior to soldering
30
C max / 85% RH max
Storage temperature after soldering
-65
C
+150
C
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