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DESCRIPTION
The WM8521 is a 192kHz stereo DAC with an integrated output
op-amp stage, designed to generate a 2.0Vrms output signal
directly, so reducing external component requirements in digital
audio applications.
WM8521 comes into two variants WM8521HC and WM8521H9
which offers different line drive output capabilities. WM8521HC
outputs 2Vrms at 12V supply, while WM8521H9 outputs
2.0Vrms at 9V supply. WM8521HC/H9 are designed for cost
sensitive consumer digital audio applications requiring 2Vrms
line output.
A 24-bit multi-bit sigma delta DAC is used with oversampling
digital interpolation filters. Digital audio input word lengths from
16-32 bits and sampling rates from 8kHz to 192kHz are
supported.
The audio interface supports I S, Right Justified and DSP digital
audio formats.
The devices are controlled via a hardware interface which
provides access to features including de-emphasis, mute and
data formats. These devices are pin equivalent and are
available in a 14-lead SOIC package.
2
WM8521
Stereo DAC with Integrated Output Stage
for 2Vrms LINE OUT
FEATURES
Audio Performance
- DAC SNR 98dB (‘A’ weighted @ 48kHz)
- THD -81dB (‘A’ weighted @ 48kHz)
DAC Sampling Frequency: 8kHz – 192kHz
Pin Selectable Audio Data Interface Format
2
- I S, 16-bit Right Justified or 16bit DSP
2.0 Vrms output at 12V or 9V supply
7.6V to 13.2V Analogue, 2.7V to 3.6 Digital Supply
14-lead SOIC Package
APPLICATIONS
Consumer digital audio applications requiring 2 Vrms output
- DVD Players
- Digital TV
- Digital Set Top Boxes
- A/V Receivers
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.2
Copyright
2013
Wolfson Microelectronics plc
WM8521
TABLE OF CONTENTS
Production Data
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
REVISION HISTORY ........................................................................................... 21
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WM8521
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
WM8521CHCGED
WM8521CHCGED/R
TEMPERATURE
RANGE
-25 to +85 C
-25 to +85 C
o
o
PACKAGE
14-lead SOIC
(Pb- free)
14-lead SOIC
(Pb-free, tape and reel)
14-lead SOIC
(Pb-free)
14-lead SOIC
(Pb-free, tape and reel)
MOISTURE SENSITIVITY
LEVEL
MSL1
MSL1
PEAK SOLDERING
TEMPERATURE
260 C
260 C
o
o
WM8521CH9GED
WM8521CH9GED/R
Note:
1.
2.
3.
Reel quantity = 3,000
-25 to +85 C
-25 to +85 C
o
o
MSL1
MSL1
260 C
260 C
o
o
WM8521H9: 2Vrms output at 9V supply
WM8521HC: 2Vrms output at 12V supply
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WM8521
PIN DESCRIPTION
PIN
1
2
3
4
5
NAME
DGND
LRCLK
DIN
BCLK
MUTE
Supply
Digital input
Digital input
Digital input
Digital input
TYPE
Digital Negative supply
Sample rate clock input
Serial audio data input
Bit clock input
Soft mute control, Internal pull down
High Impedance = Automute
High = Mute ON
Low = Mute OFF
6
7
8
9
10
11
VOUTR
AGND
CAP
AVDD
VOUTL
DEEMPH
Analogue output
Supply
Analogue output
Supply
Analogue output
Digital input
Right channel DAC output
Analogue Negative supply
Analogue internal reference
Analogue Positive supply
Left channel DAC output
De-emphasis select, Internal pull down
High = de-emphasis ON
Low = de-emphasis OFF
12
FORMAT
Digital input
Data input format select, Internal pull up
Low = 16-bit right justified or 16bit DSP ‘Mode A’
High = 16-32-bit I S or 16bit DSP ‘Mode B’
13
14
Note:
1.
Digital input pins have Schmitt trigger input buffers.
MCLK
DVDD
Digital input
Supply
Master clock input
Digital Positive supply
2
Production Data
DESCRIPTION
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WM8521
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-020 for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
Supplies are independent and can be applied in either order without damage to device.
CONDITION
Analogue Supply Voltage (AVDD)
Digital Supply voltage (DVDD)
Voltage range digital inputs
Master Clock Frequency
Operating temperature range, T
A
Storage temperature prior to soldering
Storage temperature after soldering
-25C
MIN
-0.3V
-0.3V
DGND -0.3V
MAX
+15V
+4.2V
DVDD +0.3V
50MHz
+85C
30C max / 85% RH max
-65C
+150C
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