• 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
• 16/20/24/32 bit Word Lengths
• Four 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
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation

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 an eight 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, right justified and DSP 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-pin TQFP package.