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WM8956 Datasheet(PDF) 16 Page - Cirrus Logic

Part # WM8956
Description  Hi-Fi DAC with 1W Stereo Class D Speaker Drivers
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8956 Datasheet(HTML) 16 Page - Cirrus Logic

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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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