Product category:
Analogue and Mixed Signal ICs
News Release from: Wolfson Microelectronics | Subject: WM8775/6/8
Edited by the Electronicstalk Editorial
Team on 28 August 2003
Codecs chip in to next-generation
digital audio
A new family of multichannel input devices is available for the next generation of Class-D DVD players, AV receivers, digital set-top boxes and digital effects processors and recordable media.
A new family of multichannel input devices is available for the next generation of Class-D DVD players, AV receivers, digital set-top boxes and digital effects processors and recordable media The WM8776 and WM8778 codecs, and the WM8775 ADC are among the first of their kind on the market to provide a dedicated solution for emerging recordable media technologies and digital amplifiers
This article was originally published on Electronicstalk on 13 Apr 2001 at 8.00am (UK)
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The WM8776 stereo codec is the most highly integrated device of the family with five stereo ADC inputs with analogue gain adjustable from +24 to -21dB in 0.5dB steps.
The device also features a stereo DAC with independent analogue and digital volume controls, and stereo headphone and line output.
The WM8778 stereo codec includes an ADC input with analogue gain from +24 to -21dB in 0.5dB steps and a separate ADC digital gain from -21 to -103dB in 0.5dB steps and a hardware and software control mode.
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The WM8775 ADC includes an input multiplexer with four stereo inputs with analogue gain adjustable from +24 to -21dB in 0.5dB steps and a separate digital gain from -21 to -103dB in 0.5dB steps.
Analogue inputs can be mixed into the ADC or mixed together before input to the ADC.
"Digital media is about to enter a new level of performance and quality that will push current mixed-signal semiconductors to their limits", said David Milne, CEO and Managing Director for Wolfson.
"The introduction of the WM877X family, based on the proven technology of the WM8770, provides not only the integration to meet that new level, but the capacity to help the new technology grow".
Both codecs feature 108dB signal-to-noise ratio (SNR) DACs and all three products' ADC SNR is rated at 100dB.
The DAC sampling frequency is 32 to 192kHz and the ADC sampling is rated at 32 to 96kHz.
All three products feature automatic level control on the ADC input.
The user can set a predetermined maximum analogue signal level in order to prevent the ADC input full scale voltage from being exceeded.
The automatic level control will progressively ramp down the gain and limit the signal magnitude to the predetermined limit.
All three offer the user a three-wire SPI compatible or two-wire serial control interface, master or slave clocking modes, programmable audio data interface modes and operate on 2.7 to 5.5V analogue or 2.7 to 3.6V digital supplies.
The WM8775 and WM8778 are available in 28-pin SSOPs, the WM8776 comes in a 48-pin TQFP.
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