Low Power D/A Converter with 1 W Speaker Drivers

The WM8956 is a low power stereo digital/analog converter (DAC) featuring Class D speaker drivers to provide 1 W per channel into 8 Ω loads with a 5 V 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 maximized while minimizing other analog supply currents. A highly flexible input configuration for up to three stereo sources is integrated, with a complete microphone interface. Stereo 24-bit Delta Sigma 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.

Features

  • Pop and click suppression
  • 3D enhancement
  • Stereo class D speaker driver
  • 87% efficiency (1 W output)
  • Flexible internal switching clock
  • On-chip headphone driver
  • 40 mW output power into 16 ohm at 3.3 V
  • Capless mode support
  • Microphone interface
  • Pseudo-differential for high noise immunity
  • Integrated low noise MICBIAS
  • Low power consumption
  • 16 mW headphone playback (2.7 V / 1.8 V supplies)
  • Low supply voltages
  • on-chip PLL provides flexible clocking scheme
  • Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48
  • 32-pin QFN package

Parametric Specifications

Channel(s) Out 2
Resolution (bits) 24
Dynamic Range (dB) 99
THD+N (dB) -87
Sample Rate (kHz) 96
Analog Power Supply (V) 2.7-5.5
Supply Current (µA) 1.7-3.6
Output Level (Vrms) 1
Package 32 QFN

Technical Documents

WM8956 Product Datasheet

Nov 1, 2011, v4.1 : 1089 Kb

WM8956 6158 FL32 M Schematic and Layout

Mar 1, 2009, v1.1 : 1200 Kb

WM8956 Product Flyer

Jan 1, 2006, n/a : 186 Kb

Design Resources

Class D Amplifiers Empower Mobile Multimedia

Sep 1, 2006, Rev 1.0 : 144 Kb

Class D Basics

Sep 1, 2006, Rev 1.0 : 67 Kb

Class D Audio Design Tips

Jan 1, 2006, n/a : 325 Kb

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Comprehensive Solutions