Product category:
Analogue and Mixed Signal ICs
News Release from: Wolfson Microelectronics | Subject: WM8770 and WM8771
Edited by the Electronicstalk Editorial
Team on 01 March 2002
Codecs aim for surround-sound
applications
Wolfson Microelectronics has released the first two products in its new line of 24bit eight-channel codecs for emerging surround-sound applications.
Wolfson Microelectronics has released the first two products in its new line of 24bit eight-channel codecs for emerging surround-sound applications The WM8770 and WM8771 are the first products to come from the strategic alliance with Sanyo Electric, and will be aimed at the audiovisual equipment market
This article was originally published on Electronicstalk on 13 Apr 2001 at 8.00am (UK)
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"Multichannel audio applications, like home entertainment systems and automotive surround sound, need a combination of DSP and audio DACs and ADCs and the WM8770 and WM8771 offer the highest level of integration for this type of product", said David Milne, Wolfson's managing director.
"The WM8770 and the WM8771 integrate all the necessary ADCs, multiplexing, DACs and volume control for multichannel audio.
They are designed to work in conjunction with surround sound decoder DSPs from Sanyo and others".
The WM8770 and the WM8771 are designed for audio playback of Dolby 5.1 plus L+R stereo mix down, and Dolby EX 6.1 or 7.1 applications typically required for new AV receiver products.
Both codecs integrate an eight-channel MUX with stereo ADC and eight-channel DAC.
The WM8770 also integrates an independent eight-channel analogue volume control for uncompromised audio quality.
Both the 24bit codecs are based on Wolfson's proprietary multibit sigma- delta architecture.
The ADCs and DACs offer sampling frequencies between 8 and 192kHz and are designed to run at different sampling rates.
Each input channel has analogue domain mute and programmable gain control.
The WM8771 also has three separate stereo analogue outputs for record monitoring.
Digital audio word lengths, from 16 to 32bit, in a number of different formats, offer the user flexibility in the choice of DSP or decoder interface.
Each DAC channel has independent digital attenuation and mute control.
The WM8770 includes an analogue domain volume control and it provides a six-channel direct analogue input to the output volume control.
The devices are controlled by a three-wire serial interface.
The interface provides access to all features including channel selection, volume control, mutes, de-emphasis and power management facilities.
Both the WM8770IFT and the WM8771FT are available now in 64-pin TQFPs.
Evaluation boards and complete reference design documentation are also available from Wolfson.
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