DESCRIPTION
The WM8731 or WM8731L (WM8731/L) are low power stereo CODECs with an integrated headphone driver. The WM8731/L is designed specifically for portable MP3 audio and speech players and recorders. The WM8731 is also ideal for MD, CD-RW machines and DAT recorders.

FEATURES
• Highly Efficient Headphone Driver
• Audio Performance
    - ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V
    - DAC SNR 100dB (‘A’ weighted) at 3.3V, 95dB at 1.8V
• Low Power
    - Playback only 22mW, 8mW (‘L’ Variant)
    - Analogue Pass Through 12mW, 3.5mW (‘L’ variant)
    - 1.42 – 3.6V Digital Supply Operation
    - 2.7 – 3.6V Analogue Supply Operation
    - 1.8 – 3.6V Analogue Supply Operation (‘L’ Variant)
• ADC and DAC Sampling Frequency: 8kHz – 96kHz
• Selectable ADC High Pass Filter
• 2 or 3-Wire MPU Serial Control Interface
• Programmable Audio Data Interface Modes
    - I2S, Left, Right Justified or DSP
    - 16/20/24/32 bit Word Lengths
    - Master or Slave Clocking Mode
• Microphone Input and Electret Bias with Side Tone Mixer
• Available in 28-lead SSOP or 28-lead QFN package

APPLICATIONS
• Portable MP3 Players and Recorders
• CD and Minidisc Recorders
• PDAs / smartphones