DESCRIPTION
The WM8721 is a low power stereo DAC with an integrated headphone driver. The WM8721 is designed specifically for portable MP3 audio and speech players. The WM8721 is also ideal for MD, CD machines and DAT players.
Stereo 24-bit multi-bit sigma delta DACs are used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported.

FEATURES
• Audio Performance
   − DAC SNR 100dB (‘A’ weighted) at AVDD = 3.3V
   − 1.42 – 3.6V Digital Supply Operation
   − 2.7 – 3.6V Analogue Supply Operation
• Low Power
   − Headphone Playback: 20mW at AVDD = 3.3V
• DAC Sampling Frequency: 8kHz – 96kHz
• 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
• Stereo Audio Outputs
• Output Volume and Mute Controls
• Highly Efficient Headphone Driver
• 20-Pin SSOP Package

APPLICATIONS
• Portable MP3 Players
• CD and Minidisc Players