Описание
The WM8770 is a high performance, multi-channel audio codec. The WM8770 is ideal for surround sound processing applications for home hi-fi, automotive and other audio visual equipment.A stereo 24-bit multi-bit sigma delta ADC is used with aneight stereo channel input selector. Each channel has analogue domain mute and programmable gain control. Digital audio output word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported. Four 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 192kHz are supported. Each DAC channel has independent analogue volume and mute control, with a set of input multiplexors allowing selection of an external 3 channel stereo analogue input into these volume controls.The audio data interface supports I2S, left justified and right justified digital audio formats.The device is controlled via a 3 wire serial interface. The interface provides access to all features including channel selection, volume controls, mutes, de-emphasis and power management facilities. The device is available in a 64-lead TQFP package.
- Audio Performance
- 106dB SNR (‘A’ weighted @ 48kHz) DAC
- 102dB SNR (‘A’ weighted @ 48kHz) ADC
- DAC Sampling Frequency: 8KHz – 192kHz
- ADC Sampling Frequency: 8KHz – 96kHz
- 3-Wire SPI or CCB MPU Serial Control Interface
- Master or Slave Clocking Mode
- Programmable Audio Data Interface Modes
- I2S, Left or Right Justified
- 16/20/24/32 bit Word Lengths
- Four Independent stereo DAC outputs with independent analogue and digital volume controls
- Analogue Bypass Path Feature
- Six channel selectable AUX input to the volume controls
- Eight stereo ADC inputs with analogue gain adjust from +19dB to –12dB in 1dB steps
- 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
- 5V tolerant digital inputs
