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