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DESCRIPTION
The WM8956 is a low power, high quality stereo DAC designed for portable multimedia applications. Stereo class D speaker drivers provide 1W per channel into 8 loads with a 5V supply. Low leakage, excellent PSRR and pop/click suppression mechanisms also allow direct battery connection to the speaker supply. Flexible speaker boost settings allow speaker output power to be maximised while minimising other analogue supply currents. A highly flexible input configuration for up to three stereo sources is integrated, with a complete microphone interface. External component requirements are drastically reduced as no separate microphone, speaker or headphone amplifiers are required. Stereo 24-bit sigma-delta DACs are used with low power oversampling digital interpolation filters and a flexible digital audio interface. The master clock can be input directly or generated internally by an onboard PLL, supporting most commonly-used clocking schemes. The WM8956 operates at analogue supply voltages down to 2.7V, although the digital supplies can operate at voltages down to 1.71V to save power. The speaker supply can operate at up to 5.5V, providing 1W per channel into 8 loads. Unused functions can be disabled using software control to save power. The WM8956 is supplied in a very small and thin 5x5mm QFN package, ideal for use in hand-held and portable systems.
Product Brief WM8956
Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers
FEATURES
* * * * DAC SNR 98dB (`A' weighted), THD -84dB at 48kHz, 3.3V Pop and click suppression 3D Enhancement Stereo Class D Speaker Driver - <0.1% THD with 1W per channel into 8 BTL speakers - 70dB PSRR @217Hz - 87% efficiency (1W output) - Flexible internal switching clock On-chip Headphone Driver - 40mW output power into 16 at 3.3V - Capless mode support - THD -75dB at 20mW, SNR 90dB with 16 load Microphone Interface - Pseudo differential for high noise immunity - Integrated low noise MICBIAS Low Power Consumption - 10mW headphone playback (2.7V / 1.8V supplies) Low Supply Voltages - Analogue 2.7V to 3.6V (Speaker supply up to 5.5V) - Digital core and I/O: 1.71V to 3.6V On-chip PLL provides flexible clocking scheme Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48 5x5x0.9mm QFN package
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APPLICATIONS
* * * Mobile multimedia Portable media / DVD players Games consoles
WOLFSON MICROELECTRONICS plc
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Preliminary Technical Data , September 2006, Rev 2.1
Copyright 2006 Wolfson Microelectronics plc
WM8956 IMPORTANT NOTICE
Preliminary Technical Data
Wolfson Microelectronics plc ("Wolfson") products and services are sold subject to Wolfson's terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement.
Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current.
Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation.
In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product.
Wolfson's products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer's own risk.
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PTD, September 2006, Rev 2.1 2

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