Osan WM8804,05 Flyer tekniset tiedot yritykseltä Cirrus Logic Inc.

MM“ UJolfsoni microelectronics E mm Samoa WMLWRME utemtwms Mmuolfson‘ ommirwnz . spur . mm . 8cm soiwwwmoz . smm/Gmy . cswmz . PRODUCT BENEFITS Hign jmer reiecfion improves audio signal quality Transparent derjittering of input signai in tne audio baseband Leading proprietary PLL teonnoiogy Unique ‘wim flags' status reporting mode Excellent quality system einok generation , uttra tow jitter 512fs. 256ts. 128 Poweriui and flexible GPIO routing tor system controi
New Wolfson S/PDIF transceivers offer exceptional
jitter suppression in the audio band.
The WM8804 and WM8805 are high performance solutions for S/PDIF data recovery,
routing and data transfer.
Simple and fl exible to use, the devices deliver exceptional S/PDIF functionality based on
Wolfson’s proprietary PLL technology. The WM8804 and WM8805 reduce the impact of a range
of problems caused by jitter – one of the most common and serious issues in S/PDIF systems.
As an interconnection standard, designers and users have no control over the quality of the
S/PDIF inputs. The unique Wolfson technology allows recovery of highly degraded input data
and attenuates the unwanted jitter.
Added features including a ‘with fl ags’ mode for enhanced status reporting and GPIO
functionality make these parts both fl exible and extremely easy to use.
The WM8805 is an 8 input, 1 output version. The WM8804 is a 1 input, 1 output version.
WM8804
WM8804 and WM8805 S/PDIF Transceivers
Transparent de-jittering of input signal in the audio baseband
High jitter rejection improves audio signal quality
Leading proprietary PLL technology
Unique ‘with fl ags’ status reporting mode
Digital TV
PRODUCT BENEFITS TARGET APPLICATIONS
Hi-Fi
AV and DVD Receivers
WM8805
Excellent quality system clock generation – ultra low jitter 512fs, 256fs, 128fs and 64fs PC and IPTV
Automotive
Powerful and fl exible GPIO routing for system control
W
WM8805
XIN
XOP
RX0
RX1
RX2
RX3
RX4/GPO3
RX5/GPO4
RX6/GPO5
RX7/GPO6
100n
100n
100n
100n
100n
100n
100n
100n
75R
75R
75R
75R
75R
75R
75R
75R
GPO0/SWIFMODE
GPO1
RESETB
SCLK
SDIN/HWMODE
SDOUT/GPO7
CSB/GPO2
DOUT
DIN
BITCLK
LRCLK
MCLK
PGND
PVDD
DGND
DVDD
TX0
CLKOUT
INPUT SELECTOR
GPIO
CONTROLLER CONTROL INTERFACE DIGITAL AUDIO
INTERFACE
S/PDIF
TRANSMITTER
S/PDIF
RECEIVER
PLL AND
CLOCK
RECOVERY
FEATURE
S/PDIF Inputs
S/PDIF Outputs
Sampling Rate
Error Reporting Visibility
Clock Generation
Ext. Crystal Frequencies
Audio Interface
Control Interface
Package
WM8804/WM8805
WM8804 – 1
WM8805 – 8
1
32kHz – 192kHz
Confi gurable GPIO or
Audio Interface
On-board PLL or
External Clock
10MHz – 27MHz
LJ/RJ/I2S/DSP
2/3 Wire SW, HW
WM8804 – 20-SSOP
WM8805 – 28-SSOP
Professional Recording
WFN8804_aw.indd 1WFN8804_aw.indd 1 22/5/07 16:18:5422/5/07 16:18:54
mm UJOIfSOW microelectronics
HIGH PERFORMANCE PLL
With an intrinsic period jitter of 50ps RMS, unlike many transceivers,
the WM8804 and WM8805 contribute a negligible level of jitter to
the system.
REMOVAL AND SUPPRESSION OF EXISTING JITTER
The WM8804 and WM8805 are capable of suppressing
pre-existing jitter at frequencies above 100Hz. Most competitive
S/PDIF transceivers only act above 10kHz, with no effect on the low
and medium frequencies which have the greatest impact on audio
quality. The Wolfson PLL technology enables the WM8804 and
WM8805 to lock onto and recover the data and timing from poor
quality input signals, allowing the transceivers to accept S/PDIF
from any source, even if the input signal is severely degraded.
MASTER CLOCK GENERATION
The PLL can be used to synthesise crystal derived clock signals,
without the requirement for any external fi lter, and can operate as
a high quality master timing source for the audio system, reducing
system cost whilst guaranteeing excellent performance.
WORLD HEADQUARTERS
Wolfson Microelectronics plc
Westfi eld House
26 Westfi eld Road
Edinburgh
EH11 2QB
United Kingdom
t: +44 (0)131 272 7000
f: +44 (0)131 272 7001
e: europe@wolfsonmicro.com
USA SALES OFFICE
Wolfson Microelectronics, Inc.
16 8 75 West Bernardo Drive
Suite 280
San Diego
CA 92127
USA
t: +1 (0)858 676 5090
f: +1 (0)858 676 0484
e: usa@wolfsonmicro.com
JAPAN SALES OFFICE
Wolfson Microelectronics plc
23F Sky Building
2-19-12 Takashima
Nishi-ku
Yokohama, 220-0011
Japan
t: +81 (0)45 440 1230
f: +81 (0)45 440 1231
e: japan@wolfsonmicro.com
ASIA PACIFIC SALES OFFICE
Wolfson Microelectronics plc
2F, No.39, Alley 20
Lane 407, Sec. 2
Tiding Boulevard, NeiHu District
Taipei 114
Taiwan
t: +886 (0) 2 875 11600
f: +886 (0)2 875 10201
e: asia@wolfsonmicro.com
CONTACT DETAILS
For more information please visit www.wolfsonmicro.com or sign up for Wolfson eNews at http://www.wolfsonmicro.com/enews
PO-FL-8804/05-05/07
WM8804 and WM8805 S/PDIF Transceivers
S/PDIF (IEC60958-3) compliant
Advanced jitter attenuating PLL with low intrinsic period
jitter of 50ps RMS
PLL clock recovery or crystal derived clock generation
Supports 10MHz – 27MHz crystal clock frequencies
I2S, Left Justifi ed, Right Justifi ed or DSP audio formats
16/20/24 bit Word Lengths
Up to 8 channels of S/PDIF input with 1 channel output
Auto frequency detection and synchronisation
Selectable output status data
Non-audio detection including DOLBYTM and DTSTM
PRODUCT FEATURES PRODUCT DETAILS
© COPYRIGHT 2007, WOLFSON MICROELECTRONICS PLC.
and the wave logo are a registered trademark of Wolfson Microelectronics plc. All other trademarked names, whether indicated as such or not, are the property of their respective owners. The information in
this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Wolfson Microelectronics plc assumes no responsibility for errors and omissions, and disclaims
responsibility for any consequences resulting from the use of information contained in the document.
WM8804
WM8805
300m
275m
250m
225m
200m
175m
150m
125m
100m
75m
50m
25m
0
-25m
-50m
-75m
-100m
-125m
-150m
-175m
-200m
-225m
-250m
-275m
-300m
0 20n 40n 60n 80n
TIME (ns)
100n 120n 140n 160n
300m
275m
250m
225m
200m
175m
150m
125m
100m
75m
50m
25m
0
-25m
-50m
-75m
-100m
-125m
-150m
-175m
-200m
-225m
-250m
-275m
-300m
VOLT (mV)
300m
275m
250m
225m
200m
175m
150m
125m
100m
75m
50m
25m
0
-25m
-50m
-75m
-100m
-125m
-150m
-175m
-200m
-225m
-250m
-275m
-300m
300m
275m
250m
225m
200m
175m
150m
125m
100m
75m
50m
25m
0
-25m
-50m
-75m
-100m
-125m
-150m
-175m
-200m
-225m
-250m
-275m
-300m
0 20n 40n 60n 80n
TIME (ns)
100n 120n 140n 160n
VOLT (mV)
DIAGRAM 1 – COMPETITOR’S PART
Eye Diagram showing narrowing of output eye width as a result of jitter on input
(input jitter passed to output).
DIAGRAM 2 – WOLFSON’S WM8804 AND WM8805
Eye diagram showing maintained eye width as input data as jittered
(input jitter not passed to output).
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