WM8776
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24-bit, 192kHz Stereo Codec with 5 Channel I/P Multiplexer
DESCRIPTION
FEATURES
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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.
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108dB SNR (‘A’ weighted @ 48kHz) DAC
102dB SNR (‘A’ weighted @ 48kHz) ADC
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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
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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.
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Stereo Headphone and Line Output
3-Wire SPI Compatible or 2-Wire Software Serial
Control Interface
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Master or Slave Clocking Mode
Programmable Audio Data Interface Modes
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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
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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
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Surround Sound AV Processors and Hi-Fi systems
DVD-RW
BLOCK DIAGRAM
AINOPL
AINVGL
VOUTL
VOUTR
AIN1L
AIN1R
AIN2L
AIN2R
HPVDD
AUDIO INTERFACE
AND
AIN3L
AIN3R
STEREO
ADC
STEREO
DAC
HPOUTL
LOW
PASS
FILTERS
ALC
AIN4L
AIN4R
HPOUTR
HPGND
DIGITAL FILTERS
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VMID
AIN5L
AIN5R
AINVGR
AINOPR
CONTROL INTERFACE
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WM8776
WOLFSON MICROELECTRONICS plc
Product Preview, June 2004, Rev 1.91
w :: www.wolfsonmicro.com
Copyright 2004 Wolfson Microelectronics plc