DESCRIPTION

The WM8776 is a high performance, stereo audio

CODEC with five channel input selector. The WM8776 is

ideal for surround sound processing applications for

home hi-fi, DVD-RW and other audio visual equipment.

A stereo 24-bit multi-bit sigma delta ADC is used with a

five stereo channel input mixer. Each ADC channel has

programmable gain control with automatic level control.

Digital audio output word lengths from 16-32 bits and

sampling rates from 32kHz to 96kHz are supported.

A stereo 24-bit multi-bit sigma delta DAC is used with

digital audio input word lengths from 16-32 bits and

sampling rates from 32kHz to 192kHz. The DAC has an

input mixer allowing an external analogue signal to be

mixed with the DAC signal. There are also Headphone

and line outputs, with volume controls for the

headphones.

The WM8776 supports fully independent sample rates

for the ADC and DAC. The audio data interface supports

I2S, left justified, right justified and DSP formats.

The device is controlled in software via a 2 or 3 wire

serial interface, selected by the MODE pin, which

provides access to all features including channel

selection, volume controls, mutes, and de-emphasis

facilities.

The device is available in a 48-pin TQFP package.

FEATURES

Audio Performance

108dB SNR (‘A’ weighted @ 48kHz) DAC

102dB SNR (‘A’ weighted @ 48kHz) ADC

DAC Sampling Frequency: 32kHz – 192kHz

ADC Sampling Frequency: 32kHz – 96kHz

Five stereo ADC inputs with analogue gain adjust from

+24dB to –21dB in 0.5dB steps

Programmable Limiter or Automatic Level Control (ALC)

Stereo DAC with independent analogue and digital

volume controls

Stereo Headphone and Line Output

3-Wire SPI Compatible or 2-Wire Software Serial

Control Interface

Master or Slave Clocking Mode

Programmable Audio Data Interface Modes

I2S, Left, Right Justified or DSP

16/20/24/32 bit Word Lengths

Analogue Bypass Path Feature

Selectable AUX input to the volume controls

2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply

Operation