WM8776
w
24-bit, 192kHz Stereo CODEC with 5 Channel I/P Multiplexer
DESCRIPTION
FEATURES
•
Audio Performance
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.
−
−
108dB SNR (‘A’ weighted @ 48kHz) DAC
102dB SNR (‘A’ weighted @ 48kHz) ADC
•
•
•
DAC Sampling Frequency: 32kHz – 192kHz
ADC Sampling Frequency: 32kHz – 96kHz
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.
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
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.
•
•
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
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.
16/20/24/32 bit Word Lengths
•
•
•
Analogue Bypass Path Feature
Selectable AUX input to the volume controls
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.
2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
The device is available in a 48-pin TQFP package.
APPLICATIONS
•
•
Surround Sound AV Processors and Hi-Fi systems
DVD-RW
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
Production Data, April 2005, Rev 4.0
Copyright 2005 Wolfson Microelectronics plc
w :: www.wolfsonmicro.com