Product category:
Analogue and Mixed Signal ICs
News Release from: Wolfson Microelectronics | Subject: WM8781
Edited by the Electronicstalk Editorial
Team on 11 April 2006
Audio ADC goes on the record
A new high-input-voltage ADC features an extended clocking scheme to interface to a wider range of host processors.
Wolfson Microelectronics has introduced a new high-input-voltage ADC with an extended clocking scheme, to interface to a wider range of host processors The Wolfson WM8781 complements the existing WM8782, which was one of the first ADCs on the market to accept 2V RMS analogue input signals directly
This article was originally published on Electronicstalk on 13 Apr 2001 at 8.00am (UK)
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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 device offers a low-cost stereo high-performance audio ADC solution for recordable media applications such as DVD players, personal video recorders, set-top boxes and studio audio processing equipment.
Wolfson has designed the solutions specifically to reduce overall system cost by minimising the number of external components.
As they are hardware controlled, software development effort is also reduced, and the wide ADC sampling frequency of up to 192kHz allows for a greater range of analogue input signals.
The WM8781 offers the additional capability of a 384fs master mode, for host processors generating this clock frequency, as well as supporting master or slave mode clocking schemes.
Stereo line level inputs in the WM8781, along with two control input pins, allow operation of the audio interface in three industry standard modes; IIS, RJ and LJ.
An internal op-amp is integrated on the front end of the chip to accommodate analogue input signals greater than 1V RMS.
A stereo 24bit multibit sigma-delta ADC is used with 128x, 64x or 32x oversampling, according to sample rate.
Digital audio output word lengths from 16 to 24bit and sampling rates from 8 to 192kHz are supported.
The device also has a highpass filter to remove residual DC offsets.
The WM8781 is available now in a 20-pin SSOP package.
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