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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
I
2
S, 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.
WM8776
24-bit, 192kHz Stereo Codec with 5 Channel I/P Multiplexer
FEATURES
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Audio Performance
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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
−
I
2
S, 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
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APPLICATIONS
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Surround Sound AV Processors and Hi-Fi systems
DVD-RW
DACREFN
DACREFP
VMIDDAC
BLOCK DIAGRAM
ADCREFGND
ADCMCLK
ADCREFP
VMIDADC
AGND
AVDD
ADCBCLK
DOUT
ADCLRC
DACMCLK
DACBCLK
DACLRC
DIN
AINOPL
AINVGL
VOUTL
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
VOUTR
INPUT MIXER
AUDIO INTERFACE
STEREO
ADC
VMID
ALC
ZFLAGL
ZFLAGR
HPVDD
STEREO
DAC
LOW
PASS
FILTERS
AND
DIGITAL FILTERS
HPOUTL
HPOUTR
HPGND
z
AINVGR
AINOPR
CONTROL INTERFACE
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WM8776
AUXL
AUXR
DVDD
MODE
DGND
CE
CL
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
DI
Product Preview, June 2004, Rev 1.91
Copyright
2004
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
