WM8731CLSEFL/R

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.

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 muti-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 fom 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 facllties. The device is available in a small 28 lead SSOP package or the smaller 28 lead quad flat leadless package (QFN).

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 33V, 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

   ● rs, Lft, 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 1 smartphones

BLOCK DIAGRAM

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