• DAC to HP SNR 95dB (‘A’ weighted, 3.3V)
• DAC to HP THD -83dB at 48kHz Fs, 2.4V
• ADC SNR 92dB (‘A’ weighted, 3.3V)
• ADC THD -80dB at 48kHz Fs, 2.4V
  
  Highly flexible input and output configuration
• 2 single ended or pseudo differential mic inputs
• 2 stereo line inputs (eg. Line In / FM tuner)
• Up to +48dB microphone/line input gain
• Stereo output mixers with -15dB to +6dB gain range; mixing DAC outputs, line, auxiliary and mic inputs
  
  Class-G ultra-low power headphone driver
• Up to 12.4mW per channel output power into 32Ω at 3.3V
• Up to 6.6mW per channel output power into 32Ω at 2.4V
• DC-coupled
• Ground referenced outputs
• Pop and click suppression circuitry 

• Soft Mute Control
  
  Low Power Consumption with user selectable modes
• 9 mW stereo headphone playback (32Ω)
• (AVDD = 2.4V, DCVDD = 1.8V, 48k fs)
• 6 mW stereo headphone playback (32Ω)
• (AVDD = 2.4V, DCVDD = 1.8V, 8k fs, quiescent)
• 5 mW bypass mode. Line in to stereo headphone playback (32Ω) (AVDD = 2.4V, DCVDD = 1.8V)
  
  Low Supply Voltages
• Analogue: 2.4V to 3.3V
• Digital core: 1.8V to 3.3V
• Digital I/O: 1.8V to 3.3V
• Charge Pump High: 2.4V to 3.3V
• Charge Pump Low: 1.6V to 3.3V 

• Low power FLL - supports 1MHz to 19.2MHz input clocks

• TDM mode - dual data time slots for ADC and DAC 

• Audio sample rates (kHz): 8, 11.025, 16, 22.05, 24, 32, 44.1, 48 generated internally from master clock 
• 5 x 5 x 0.55mm 40 lead QFN package

The WM8900 is designed for portable multimedia applications requiring low power consumption, high performance audio and a compact form factor. Pop and click optimised ground referenced headphone amplifiers provide high quality audio performance and improved bass response whilst also eliminating bulky headphone capacitors. Headphone amplifier playback power consumption is minimised by implementing an efficient class G amplifier powered by adaptive charge pump technology. Flexible analogue signal routing and digital signal processing capabilities enable advanced audio signal manipulation for fully featured multimedia applications whilst minimising power consumption.

Stereo 24bit multi-bit sigma-delta ADCs and DACs are used with over-sampling digital interpolation and decimation filters. The master clock can be input directly or generated internally by an integrated low power FLL. WM8900 operates at analogue supply voltages down to 2.4v. The digital core can operate at voltages down to 1.8v to save power. Different sections of the chip can also be powered down under software control. The WM8900 is supplied in a very small and thin 5x5x0.55mm QFN package, ideal for use in hand-held and portable systems 

Low power, high performance audio features can be realized with a minimal set of small form factor external components, reducing BOM costs and PCB dimensions.