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Wolfson has released a new high input voltage analog-to-digital converter (ADC) with an extended clock circuit that can accommodate a wider range of host processors.The Wolfson WM8781 complements the existing WM8782, the industry's first analog-to-digital converter that can directly accept 2Vrms analog input signals. The Wolfson WM8781 provides low-cost, stereo and high-performance audio analog-to-digital converters for recordable media applications such as DVD players, personal video recorders, set-top boxes and studio audio processing equipment. Wolfson has designed a special solution to reduce the total cost of the system by using a minimum number of external components. Thanks to the hardware control, the software development investment can be reduced, and the analog-to-digital converter has a sampling frequency limit of 192 kHz, allowing a wider range of analog input signals.
The WM8781 provides an additional feature in 384fs host mode for the host processor to generate this clock frequency while supporting either master mode or slave mode clock circuitry.
The stereo line level input used in the WM8781 with two control input pins allows the audio interface to operate in three industry standard modes: I2S, RJ (right justified) and LJ. (left justified). A built-in operational amplifier is integrated at the front end of the chip to receive analog input signals greater than 1Vrms. The 24-bit sigma-delta analog-to-digital converter of the stereo system has 128x, 64x or 32x oversampling techniques for different sampling rates; 16-bit to 24-bit digital audio output word length, and sample rate from 8kHz to 192kHz. The WM8781's high-pass filter also eliminates residual DC offset.
The WM8781 is available in a 20-pin SSOP package and is priced at $1.59 in quantities of 10,000.
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