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DESCRIPTION
The WM8501 is a high performance stereo DAC with an
integrated 1.7Vrms line driver. It is designed for audio
applications that require a high voltage output along with
enhanced load drive capability.
The WM8501 supports data input word lengths from 16 to
24-bits and sampling rates up to 192kHz. The WM8501
consists of a serial interface port, digital interpolation filters,
multi-bit sigma delta modulators and stereo DAC in a 14-
lead SOIC package.
The hardware control interface is used for the selection of
audio data interface format, enable and de-emphasis. The
2
WM8501 supports I S, right Justified or DSP interfaces.
Operating on separate analog and digital supplies the
WM8501 offers very lower power consumption from the
digital section, whilst supporting enhanced load drive from
the analogue output.
WM8501
24-bit 192kHz Stereo DAC with 1.7Vrms Line Driver
FEATURES
Stereo DAC with 1.7Vrms line driver from 5V analogue
supply
Audio performance
-
100dB SNR (‘A’ weighted @ 48kHz)
-
-88dB THD
DAC Sampling Frequency: 8kHz – 192kHz
Pin Selectable Audio Data Interface Format
-
I S, 16-bit Right Justified or DSP
2
14-lead SOIC package
4.5V - 5.5V analogue, 2.7V - 5.5V digital supply operation
APPLICATIONS
STB
DVD
Digital TV
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.3
Copyright
2013
Wolfson Microelectronics plc
WM8501
Production Data
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
RECOMMENDED OPERATING CONDITIONS .......................................................... 5
ELECTRICAL CHARACTERISTICS .......................................................................... 6
MASTER CLOCK TIMING .....................................................................................................7
DIGITAL AUDIO INTERFACE ...............................................................................................7
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 .......................................................................................12
DIGITAL FILTER CHARACTERISTICS ................................................................... 14
DAC FILTER RESPONSES ................................................................................................14
DIGITAL DE-EMPHASIS CHARACTERISTICS ....................................................... 15
APPLICATIONS INFORMATION ............................................................................. 16
RECOMMENDED EXTERNAL COMPONENTS .................................................................16
POWER UP/DOWN SEQUENCE ........................................................................................17
RECOMMENDED ANALOGUE LOW PASS FILTER ..........................................................17
PCB LAYOUT RECOMMENDATIONS ................................................................................18
PACKAGE DRAWING .............................................................................................. 19
IMPORTANT NOTICE .............................................................................................. 20
ADDRESS: ..........................................................................................................................20
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Production Data
WM8501
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
WM8501CGED
WM8501CGED/R
TEMPERATURE
RANGE
-40 to +85 C
-40 to +85 C
o
o
PACKAGE
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
Note:
Reel quantity = 3,000
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WM8501
Production Data
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
NAME
LRCLK
DIN
BCLK
ENABLE
VMID
ROUT
AGND
AVDD
LOUT
DGND
DVDD
DEEMPH
TYPE
Digital input
Digital input
Digital input
Digital input
Analogue output
Analogue output
Supply
Supply
Analogue output
Digital Supply
Digital Supply
Digital input
Sample rate clock input
Serial audio data input
Bit clock input
Enable input – 0 = powered down, 1 = enabled
Analogue internal reference
Right channel DAC output
Ground reference for analog circuits and substrate connection
Positive supply for analog circuits
Left channel DAC output
Digital ground supply
Digital positive supply
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 (Mode B)
High = 16-24-bit I S or DSP (Mode A)
14
Note:
1.
Digital input pins have Schmitt trigger input buffers.
MCLK
Digital input
Master clock input
2
DESCRIPTION
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Production Data
WM8501
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.
CONDITION
Analogue supply voltage
Digital supply voltage
Voltage range digital inputs
Master clock frequency
Operating temperature range, T
A
Storage temperature prior to soldering
Storage temperature after soldering
-40C
MIN
-0.3V
-0.3V
DGND -0.3V
MAX
+7V
+7V
DVDD +0.3V
38.462MHz
+85C
30C max / 85% RH max
-65C
+150C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
Ground
Difference DGND to AGND
SYMBOL
DVDD
AVDD
AGND, DGND
-0.3
TEST CONDITIONS
MIN
2.7
4.5
0
0
+0.3
TYP
MAX
5.5
5.5
UNIT
V
V
V
V
Note:
Digital supply DVDD must never be more than 0.3V greater than AVDD for normal operation of the device.
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