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WM8956 Datasheet(PDF) 16 Page - Cirrus Logic |
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WM8956 Datasheet(HTML) 16 Page - Cirrus Logic |
16 / 80 page WM8956 Production Data w PD, November 2011, Rev 4.1 16 DEVICE DESCRIPTION INTRODUCTION The WM8956 is a low power audio DAC offering a combination of high quality audio, advanced features, low power and small size. These characteristics make it ideal for portable digital audio applications with stereo speaker and headphone outputs such as games consoles, portable media players and multimedia phones. Stereo class D speaker drivers can provide 1W per channel into 8 loads. BTL configuration provides high power output and excellent PSRR. Low leakage and pop/click suppression mechanisms allow direct battery connection, reducing component count and power consumption in portable battery- powered applications. Highly flexible speaker boost settings provide fully internal level-shifting of analogue output signals, allowing speaker output power to be maximised while minimising other analogue supply currents, and requiring no additional components. A flexible input configuration includes support for two stereo microphone interfaces (single-ended or pseudo-differential) and additional stereo line inputs. Up to three stereo analogue input sources are available, removing the need for external analogue switches in many applications. Boost amplifiers are available for additional gain on the microphone inputs. The stereo DACs are of hi-fi quality using a 24-bit, low-order oversampling architecture to deliver optimum performance. The DAC output signal can be mixed with analogue input signals from the line inputs or bypass paths. This mix is available on speaker and headphone/line outputs. The WM8956 has a configurable digital audio interface where digital audio playback data is fed to the DAC. It supports a number of audio data formats including I 2S, DSP Mode (a burst mode in which frame sync plus two data packed words are transmitted), MSB-First, left justified and MSB-First, right justified, and can operate in master or slave modes. In PCM mode A-law and -law companding is supported. The SYSCLK (system clock) provides clocking for the DACs, DSP core, class D outputs and the digital audio interface. SYSCLK can be derived directly from the MCLK pin or via an integrated PLL, providing flexibility to support a wide range of clocking schemes. All MCLK frequencies typically used in portable systems are supported for sample rates between 8kHz and 48kHz. A flexible switching clock for the class D speaker drivers (synchronous with the audio DSP clocks for best performance) is also derived from SYSCLK. To allow full software control over all its features, the WM8956 uses a 2 wire control interface. It is fully compatible and an ideal partner for a wide range of industry standard microprocessors, controllers and DSPs. Unused circuitry can be disabled via software to save power, while low leakage currents extend standby and off time in portable battery-powered applications. |
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