Cirrus Logic WM8731CLSEFL/R

The WM8731 or WM8731L (WM8731L) 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. Stereo line and mono microphone level audio inputs are provided, along with a mute function, programmable line level volume control and a bias voltage output suitable for an electret type microphone. Stereo 24- bit multi- bit sigma delta ADCs and DACs are used with oversampling digital interpolation and decimation filters. Digital audio input word lengths from 16- 32 bits and sampling rates from 8kHz to 96kHz are supported. Stereo audio outputs are suffered for driving headphones from a programmable volume control, line level outputs are also provided along with anti- thump mute and power up/down circuitry. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes, de- emphasis and extensive power management facilities. The device is available in a small 28- lead SSOP package or the smaller 28- lead quad flat leadless package (QFN).

• 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

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