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Stereo Audio CODEC
DESCRIPTION
The WM8734 is a low power stereo CODEC ideal for MD,
CD-RW machines and DAT recording applications.
Stereo line inputs are provided, along with a mute function
and programmable line level volume control.
Stereo 24-bit multi-bit sigma delta ADCs and DACs are
used with oversampling digital interpolation and decimation
filters.
Digital audio input word lengths from 16-32 bits and
sampling rates from 8kHz to 96kHz are supported.
Stereo audio line level outputs are provided along with anti-
thump mute and power up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including level
controls, mutes, de-emphasis and power management
facilities. The device is available in 20-lead SSOP or 28-
lead, 5x5mm QFN packages.
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•
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WM8734
FEATURES
•
Audio Performance
−
90dB SNR (‘A’ weighted @ 48kHz) ADC
−
100dB SNR (‘A’ weighted @ 48kHz) DAC
−
2.7 – 3.6V Digital Supply Operation
−
2.7 – 3.6V Analogue Supply Operation
ADC and DAC Sampling Frequency: 8kHz – 96kHz
Selectable ADC High Pass Filter
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
−
−
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I S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
Master or Slave Clocking Mode
2
Stereo Audio Inputs and Outputs
20-lead SSOP or 5x5mm QFN Package Options
APPLICATIONS
•
•
CD and Minidisc Recorder
MP3 Player / Recorder
BLOCK DIAGRAM
CSB
SDIN
MODE
SCLK
AVDD
CONTROL INTERFACE
VMID
AGND
W
WM8734
RLINEIN
VOL
ADC
DAC
MUTE
ROUT
+12 to -34.5dB,
1.5dB Steps
DIGITAL
FILTERS
LLINEIN
VOL
ADC
DAC
MUTE
LOUT
+12 to -34.5dB,
1.5dB Steps
CLKIN
DIVIDER
(Div x1, x2)
DIGTAL AUDIO INTERFACE
DBVDD
MCLK
DACDAT
DACLRC
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ADCLRC
ADCDAT
Production Data, November 2006, Rev 4.1
Copyright
2006
Wolfson Microelectronics plc
DCVDD
DGND
BCLK
WM8734
Production Data
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................1
PIN CONFIGURATION – SSOP.............................................................................3
ORDERING INFORMATION - SSOP .....................................................................3
PIN DESCRIPTION - SSOP ...................................................................................4
PIN CONFIGURATION – QFN ...............................................................................5
ORDERING INFORMATION - QFN........................................................................5
PIN DESCRIPTION - QFN......................................................................................6
ABSOLUTE MAXIMUM RATINGS.........................................................................7
RECOMMENDED OPERATING CONDITIONS .....................................................7
ELECTRICAL CHARACTERISTICS ......................................................................8
TERMINOLOGY .....................................................................................................9
POWER CONSUMPTION (EXAMPLES) .............................................................10
MASTER CLOCK TIMING....................................................................................11
DIGITAL AUDIO INTERFACE – MASTER MODE ....................................................... 11
DIGITAL AUDIO INTERFACE – SLAVE MODE .......................................................... 12
MPU INTERFACE TIMING .......................................................................................... 14
DEVICE DESCRIPTION.......................................................................................16
AUDIO SIGNAL PATH................................................................................................. 16
DEVICE OPERATION ................................................................................................. 22
AUDIO DATA SAMPLING RATES............................................................................... 27
ACTIVATING DSP AND DIGITAL AUDIO INTERFACE .............................................. 32
SOFTWARE CONTROL INTERFACE......................................................................... 32
POWER DOWN MODES ............................................................................................ 34
REGISTER MAP ......................................................................................................... 36
DIGITAL FILTER CHARACTERISTICS ...............................................................38
TERMINOLOGY .......................................................................................................... 39
DAC FILTER RESPONSES .................................................................................39
ADC FILTER RESPONSES .................................................................................39
ADC HIGH PASS FILTER ........................................................................................... 40
DIGITAL DE-EMPHASIS CHARACTERISTICS ...................................................40
APPLICATIONS INFORMATION .........................................................................42
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 42
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS........................................ 43
PACKAGE DIMENSIONS (SSOP) .......................................................................44
PACKAGE DIMENSIONS (QFN) .........................................................................45
IMPORTANT NOTICE ..........................................................................................46
ADDRESS: .................................................................................................................. 46
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PD Rev 4.1 November 2006
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WM8734
PIN CONFIGURATION – SSOP
DGND
DBVDD
BCLK
DACDAT
DACLRC
ADCDAT
ADCLRC
LOUT
ROUT
AVDD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DCVDD
MCLK
SCLK
SDIN
CSB
MODE
LLINEIN
RLINEIN
VMID
AGND
Production Data
ORDERING INFORMATION - SSOP
DEVICE
XWM8734EDS
TEMPERATURE RANGE
-25 to +85 C
o
o
PACKAGE
20-lead SSOP
(Pb-free)
20-lead SSOP
(Pb-free
tape and reel)
MOISTURE SENSITIVITY
LEVEL
MSL1
PEAK SOLDERING
TEMPERATURE
260°C
XWM8734EDS/R
Note:
Reel quantity = 2,000
-25 to +85 C
MSL1
260°C
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PD Rev 4.1 November 2006
3
WM8734
PIN DESCRIPTION - SSOP
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Note:
1.
Pull Up/Down only present when Control Register Interface ACTIVE = 0 to conserve power.
NAME
DGND
DBVDD
BCLK
DACDAT
DACLRC
ADCDAT
ADCLRC
LOUT
ROUT
AVDD
AGND
VMID
RLINEIN
LLINEIN
MODE
CSB
SDIN
SCLK
MCLK
DCVDD
TYPE
Ground
Supply
Digital Input/Output
Digital Input
Digital Input/Output
Digital Output
Digital Input/Output
Analogue Output
Analogue Output
Supply
Ground
Analogue Output
Analogue Input
Analogue Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
Digital Input
Supply
DESCRIPTION
Digital GND
Digital Buffers VDD
Digital Audio Bit Clock, Pull Down, (see Note 1)
DAC Digital Audio Data Input
DAC Sample Rate Left/Right Clock. Pull Down (see Note 1)
ADC Digital Audio Data Output
ADC Sample Rate Left/Right Clock, Pull Down (see Note 1)
Left Channel Line Output
Right Channel Line Output
Analogue VDD
Analogue GND
Mid-rail reference decoupling point
Right Channel Line Input (AC coupled)
Left Channel Line Input (AC coupled)
Control Interface Selection, Pull Up (see Note 1)
Production Data
3-Wire MPU Chip Select / 2-Wire MPU interface address selection, active low,
Pull up (see Note 1)
3-Wire MPU Data Input / 2-Wire MPU Data Input
3-Wire MPU Clock Input / 2-Wire MPU Clock Input
Master Clock Input (MCLK)
Digital Core VDD
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PD Rev 4.1 November 2006
4
WM8734
PIN CONFIGURATION – QFN
Production Data
TOP VIEW
ORDERING INFORMATION - QFN
DEVICE
TEMPERATURE
RANGE
PACKAGE
28-lead QFN
(5x5x0.9mm)
(Pb-free)
28-lead QFN
(5x5x0.9mm)
(Pb-free, tape and reel)
MOISTURE
SENSITIVITY LEVEL
PEAK SOLDERING
TEMPERATURE
WM8734SEFL
-25 to +85 C
o
MSL 1
260°C
WM8734SEFL/R
Note:
Reel quantity = 3,500
-25 to +85 C
o
MSL 1
260°C
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PD Rev 4.1 November 2006
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