WM8804
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1:1 Digital Interface Transceiver with PLL
DESCRIPTION FEATURES
S/PDIF (IEC60958-3) compliant.
The WM8804 is a high performance consumer mode
S/PDIF transceiver with support for 1 received channel and Advanced jitter attenuating PLL with low intrinsic period
1 transmitted channel. jitter of 50 ps RMS.
S/PDIF recovered clock using PLL, or stand alone crystal
A crystal derived, or externally provided high quality master
derived clock generation.
clock is used to allow low jitter recovery of S/PDIF supplied
Supports 10 27MHz crystal clock frequencies.
master clocks.
2-wire / 3-Wire serial or hardware control interface.
Generation of all typically used audio clocks is possible
Programmable audio data interface modes:
using the high performance internal PLL. A dedicated
2
- I S, Left, Right Justified or DSP
CLKOUT pin provides a high drive clock output.
- 16/20/24 bit word lengths
A pass through option is provided which allows the device
1 channel receiver input and 1 channel transmit output.
simply to be used to clean up (de-jitter) the received digital
Auto frequency detection / synchronisation.
audio signals.
Selectable output status data bits.
The device may be used under software control or stand
Up to 3 configurable GPO pins.
alone hardware control modes. In software control mode,
De-emphasis flag output.
both 2-wire with read back and 3-wire interface modes are
TM TM
supported.
Non-audio detection including DOLBY and DTS .
Channel status changed flag.
Status and error monitoring is built-in and results can be
Configurable clock distribution with selectable output
read back over the control interface, on the GPO pins or
MCLK rate of 512fs, 256fs, 128fs and 64fs.
streamed over the audio data interface in With Flags mode
(audio data with status flags appended). 2.7 to 3.6V digital and PLL supply voltages.
2
20-lead SSOP package.
The audio data interface supports I S, left justified, right
justified and DSP audio formats of 16-24 bit word length,
APPLICATIONS
with sample rates from 32 to 192ks/s.
AV processors and Hi-Fi systems
The device is supplied in a 20-lead Pb-free SSOP package.
Music industry applications
DVD-P/DVD-RW
Digital TV
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc Production Data, March 2009, Rev 4.5
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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
RECOMMENDED OPERATING CONDITIONS ..................................................... 6
SUPPLY CURRENT ...................................................................................................... 6
ELECTRICAL CHARACTERISTICS ...................................................................... 6
MASTER CLOCK TIMING ............................................................................................. 7
DIGITAL AUDIO INTERFACE MASTER MODE ......................................................... 7
DIGITAL AUDIO INTERFACE SLAVE MODE ............................................................ 8
CONTROL INTERFACE 3-WIRE MODE .................................................................... 9
CONTROL INTERFACE 2-WIRE MODE .................................................................. 10
DEVICE DESCRIPTION ....................................................................................... 11
INTRODUCTION ......................................................................................................... 11
POWER UP CONFIGURATION .................................................................................. 12
CONTROL INTERFACE OPERATION ........................................................................ 14
HARDWARE CONTROL MODE .................................................................................. 18
DIGITAL ROUTING CONTROL ................................................................................... 20
MASTER CLOCK AND PHASE LOCKED LOOP ......................................................... 21
SOFTWARE MODE INTERNAL CLOCKING .............................................................. 21
HARDWARE MODE INTERNAL CLOCKING .............................................................. 30
S/PDIF TRANSMITTER ............................................................................................... 31
S/PDIF RECEIVER ...................................................................................................... 34
GENERAL PURPOSE OUTPUT (GPO) CONFIGURATION ....................................... 43
DIGITAL AUDIO INTERFACE ..................................................................................... 44
AUDIO DATA FORMATS ............................................................................................ 45
REGISTER MAP ......................................................................................................... 52
APPLICATIONS INFORMATION ......................................................................... 63
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 63
PACKAGE DIMENSIONS .................................................................................... 65
IMPORTANT NOTICE .......................................................................................... 66
ADDRESS: .................................................................................................................. 66
PD, Rev 4.5, March 2009
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