Cirrus Logic WM8731SEDS/RV

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. 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 buffered 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