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 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-pin TQFP package.
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
Ordering & Samples
- The CCB Sanyo Proprietary Interface
- Decoupling and Layout Methodology for Wolfson DACs, ADCs and CODECs, Rev 1.1