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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 8Ω
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 over-
sampling 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 8Ω 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.
WM8956
Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and
Headphone Drivers
FEATURES
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DAC SNR 99dB (‘A’ weighted), THD -87dB at 48kHz, 3.3V
Pop and click suppression
3D Enhancement
Stereo Class D Speaker Driver
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<0.1% THD with 1W per channel into 8Ω BTL speakers
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70dB PSRR @217Hz
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87% efficiency (1W output)
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Flexible internal switching clock
On-chip Headphone Driver
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40mW output power into 16Ω at 3.3V
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Capless mode support
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THD+N -70dB at 20mW, SNR 99dB with 16Ω load
Microphone Interface
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Pseudo differential for high noise immunity
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Integrated low noise MICBIAS
Low Power Consumption
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16mW headphone playback (2.7V / 1.8V supplies)
Low Supply Voltages
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Analogue 2.7V to 3.6V (Speaker supply up to 5.5V)
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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
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Mobile multimedia
Portable media / DVD players
Games consoles
WOLFSON MICROELECTRONICS plc
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Preliminary Technical Data, July 2007, Rev 2.1
Copyright
©2007
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
