Product category:
Communications ICs (Wired)
News Release from: Wolfson Microelectronics | Subject: WM8804 and WM8805
Edited by the Electronicstalk Editorial
Team on 16 May 2007
Audio transceivers claim best jitter
rejection
Transceivers address the challenges of high quality, cost-effective S/PDIF audio data transfer in LCD televisions, hi-fi, PC motherboards and many other audio systems.
Wolfson Microelectronics is claiming a new standard in S/PDIF performance with the release of audio transceivers that offer world class jitter rejection The new WM8804 and WM8805 devices successfully address the challenges of high quality, cost-effective S/PDIF audio data transfer in LCD televisions, hi-fi, PC motherboards and many other audio systems
This article was originally published on Electronicstalk on 13 Apr 2001 at 8.00am (UK)
Related stories
High-performance audio DAC drives novel CD player
Wolfson's high-performance stereo digital-analogue conversion technology is at the heart of two new CD players introduced by hi-fi specialist Rega Research.
Stereo DAC supports Direct Stream Digital
Wolfson Microelectronics has unveiled its first stereo DAC with support for the Direct Stream Digital (DSD) audio data format.
The transceivers are structured around an integrated high performance PLL with an intrinsic period jitter of 50ps and jitter rejection frequency of 100Hz.
Unlike many other transceivers of this type, the WM8804 and WM8805 contribute a negligible level of jitter to the audio system.
Traditionally, S/PDIF transceivers can only suppress jitter above 10kHz and have no effect on the low and medium frequencies, which have the greatest impact on audio quality.
Further reading
AC'97-compliant audio convertor gains pen input
Wolfson Microelectronics reckons it could revolutionise the PDA industry by combining pen-input functionality with a high-performance portable audio codec.
Analogue front end for a sharper image
Wolfson Microelectronics has introduced a family of high-level integrated analogue front ends.
Crucially, the WM8804 and WM8805 are capable of suppressing these pre-existing timing issues on the signal at frequencies above 100Hz, removing any unwanted audio distortion or problems in this critical audio range.
As an interconnection standard, users and designers have no control over the quality of the S/PDIF inputs into their systems from third parties.
The Wolfson PLL technology enables the WM8804 and WM8805 receivers to lock onto and recover the data and timing from poor quality input signals, thereby allowing the transceivers to accept S/PDIF signals from any source, even if the input signal is severely degraded.
A further benefit of the high performance PLL is the reduction in component count for the overall system.
The PLL can be used to synthesise crystal derived clock signals and, without the requirement for any external filter, can operate as a high quality master timing source for the audio system.
The WM8804 and WM8805 are fully compliant with the IEC60958-3 standard for S/PDIF, including a unique "with flags" mode.
Status and error information can be extracted using a variety of methods.
The WM8804 has one input and one output for use in LCD TVs, DVD recorders, musical instruments and other personal electronics requiring high performance digital audio.
The WM8805, with eight inputs and one output, is specifically designed for use in systems where digital audio channel switching is necessary, such as AV and DVD receivers and professional and home recording systems.
The new devices augment Wolfson's existing portfolio of high-performance S/PDIF-capable audio codecs, such as the WM8580, WM8581 and WM8777.
The WM8804 and WM8805 are available for sampling now in low pin count packages (20-pin SSOP for the WM8804 and 28-pin SSOP for the WM8805).
• Wolfson Microelectronics: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
