The WM8731 is a low power stereo codec with an integrated headphone driver. 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 electric type microphone. Digital audio input word lengths from 16-32 bits and sampling rates from 8 kHz to 96 kHz 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.
Features
Stereo audio codec with integrated headphone driver (50mW on 16W @ 3.3V)
1.42 – 3.6 V digital supply
2.7 – 3.6 V analog supply (standard)
1.8 – 3.6 V analog supply (’L’ version)
Playback mode power consumption < 18mW
100 dB SNR (‘A’ weighted @ 48kHz) DAC
90 dB SNR (‘A’ weighted @ 48kHz) ADC
Sampling frequency: 8 – 96 kHz
Master or slave clocking mode
USB clocking mode can generate all common MP3 sample rates (incl. 441.kHz) directly from USB clock
Output volume and mute controls
Microphone input and electret bias with side tone mixer
Selectable ADC high pass filter
2 or three-wire MPU serial control interface
Programmable audio data interface modes
28-Pin SSOP package
The WM8731 is a low power stereo codec with an integrated headphone driver. 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 electric type microphone. Digital audio input word lengths from 16-32 bits and sampling rates from 8 kHz to 96 kHz 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.
Features
- Stereo audio codec with integrated headphone driver (50mW on 16W @ 3.3V)
- 1.42 – 3.6 V digital supply
- 2.7 – 3.6 V analog supply (standard)
- 1.8 – 3.6 V analog supply (’L’ version)
- Playback mode power consumption < 18mW
- 100 dB SNR (‘A’ weighted @ 48kHz) DAC
- 90 dB SNR (‘A’ weighted @ 48kHz) ADC
- Sampling frequency: 8 – 96 kHz
- Master or slave clocking mode
- USB clocking mode can generate all common MP3 sample rates (incl. 441.kHz) directly from USB clock
- Output volume and mute controls
- Microphone input and electret bias with side tone mixer
- Selectable ADC high pass filter
- 2 or three-wire MPU serial control interface
- Programmable audio data interface modes
- 28-Pin SSOP package
