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24-bit, 192kHz Stereo CODEC
DESCRIPTION
The WM8591 is a high performance, stereo audio CODEC with
single-ended inputs and differential outputs. It is ideal for
surround sound processing applications for home hi-fi, DVD-
RW and other audio visual equipment.
The stereo 24-bit multi-bit sigma delta ADC has programmable
gain with limiting control. Digital audio output word lengths from
16-32 bits and sampling rates from 32kHz to 96kHz are
supported.
A stereo multi-bit sigma delta DAC is used with digital audio
input word lengths from 16-32 bits and sampling rates from
32kHz to 192kHz.
The WM8591 supports fully independent sample rates for the
ADC and DAC. The audio data interface supports I
2
S, left
justified, right justified and DSP formats.
The device is controlled in software via a 2-wire serial interface
which provides access to all features including volume controls,
mutes, and de-emphasis facilities. The device is available in a
28-lead SSOP package.
WM8591
FEATURES
•
Audio Performance
−
110dB SNR (‘A’ weighted @ 48kHz) DAC
−
102dB SNR (‘A’ weighted @ 48kHz) ADC
DAC Sampling Frequency: 32kHz – 192kHz
ADC Sampling Frequency: 32kHz – 96kHz
Stereo ADC input analogue gain adjust from +24dB to –21dB in
0.5dB steps
ADC digital gain from -21.5dB to -103dB in 0.5dB steps
Programmable Limiter on ADC input.
Stereo DAC with differential analogue line outputs.
2-wire Serial Control Interface
Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
−
I
2
S, Left, Right Justified or DSP
−
16/20/24/32 bit Word Lengths
4.5V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
28-lead SSOP Package
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APPLICATIONS
BLOCK DIAGRAM
•
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Surround Sound AV Processors and Hi-Fi systems
DVD-RW
WOLFSON MICROELECTRONICS plc
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Production Data, December 2005, Rev 4.0
Copyright
2005
Wolfson Microelectronics plc
WM8591
TABLE OF CONTENTS
Production Data
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
ABSOLUTE MAXIMUM RATINGS.........................................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY ............................................................................................................ 8
MASTER CLOCK TIMING......................................................................................9
DIGITAL AUDIO INTERFACE – MASTER MODE ......................................................... 9
DIGITAL AUDIO INTERFACE – SLAVE MODE .......................................................... 10
CONTROL INTERFACE TIMING – 2-WIRE SERIALCONTROL ................................. 12
DEVICE DESCRIPTION.......................................................................................13
INTRODUCTION ......................................................................................................... 13
AUDIO DATA SAMPLING RATES............................................................................... 13
ZERO DETECT ........................................................................................................... 15
POWERDOWN MODES ............................................................................................. 15
INTERNAL POWER ON RESET CIRCUIT.................................................................. 16
DIGITAL AUDIO INTERFACE ..................................................................................... 18
CONTROL INTERFACE OPERATION ........................................................................ 22
CONTROL INTERFACE REGISTERS ........................................................................ 23
ADC/DAC SYNCHRONIZATION ................................................................................. 32
LIMITER / AUTOMATIC LEVEL CONTROL (ALC) ...................................................... 33
REGISTER MAP ......................................................................................................... 37
DIGITAL FILTER CHARACTERISTICS ...............................................................44
DAC FILTER RESPONSES......................................................................................... 45
ADC FILTER RESPONSES......................................................................................... 46
ADC HIGH PASS FILTER ........................................................................................... 46
DIGITAL DE-EMPHASIS CHARACTERISTICS........................................................... 47
APPLICATIONS INFORMATION .........................................................................48
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 48
USE OF ADC/DAC SYNCHRONIZER ......................................................................... 49
PACKAGE DIMENSIONS ....................................................................................50
IMPORTANT NOTICE ..........................................................................................51
ADDRESS: .................................................................................................................. 51
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Production Data
WM8591
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
WM8591GEDS/V
WM8591GEDS/RV
Note:
Reel quantity = 2,000
TEMPERATURE
RANGE
-25 to +85
o
C
-25 to +85
o
C
PACKAGE
28-lead SSOP
(Pb-free)
28-lead SSOP
(Pb-free, tape and reel)
MOISTURE
SENSITIVITY LEVEL
MSL2
MSL2
PEAK SOLDERING
TEMPERATURE
260°C
260°C
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WM8591
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
25
26
27
28
Notes:
1.
Digital input pins have Schmitt trigger input buffers.
NAME
DI
CL
ZFLAGR
ZFLAGL
ADCLRC
ADCBCLK
ADCMCLK
DOUT
DACLRC
DACBCLK
DACMCLK
DIN
DVDD
DGND
VOUTRP
VOUTRN
VOUTLP
VOUTLN
AGND
REFN
VMID
REFP
AVDD
NC
AINL
NC
AINR
CE
Analogue Input
Digital Input
Analogue Input
TYPE
Digital Input
Digital Input
Digital Output
(open drain)
Digital Output
(open drain)
Digital Input/Output
Digital Input/Output
Digital Input
Digital Output
Digital Input/Output
Digital Input/Output
Digital Input
Digital Input
Supply
Supply
Analogue Output
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Input
Analogue Output
Analogue Input
Supply
Serial interface data
Serial interface clock
Right channel zero flag output (external pull-up required)
Left channel zero flag output (external pull-up required)
ADC left/right word clock
ADC audio interface bit clock
DESCRIPTION
Production Data
Master ADC clock; 256, 384, 512 or 768fs (fs = word clock frequency)
ADC data output
DAC left/right word clock
DAC audio interface bit clock
Master DAC clock; 256, 384, 512, 768fs or 1152fs (fs = word clock
frequency)
DAC data input
Digital positive supply
Digital negative supply
DAC right channel positive output
DAC right channel negative output
DAC left channel positive output
DAC left channel negative output
Analogue negative supply and substrate connection
Negative reference input
Midrail divider decoupling pin; must be externally decoupled
Positive reference input
Analogue positive supply
No Connection
Left channel input
No Connection
Right channel input
2-wire address select
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WM8591
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
Digital supply voltage, DVDD
Analogue supply voltage, AVDD
Voltage range digital inputs
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, T
A
Storage temperature
Notes:
1.
Analogue and digital grounds must always be within 0.3V of each other.
-25°C
-65°C
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
MAX
+4.5V
+7V
DVDD + 0.3V
AVDD +0.3V
37MHz
+85°C
+150°C
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