WM8776 Datasheet, PDF (1/55 Pages) Wolfson Microelectronics plc – 24 BIT 192KHZ STEREO CODEC WITH 5 CHANNEL I/P MULTIPLEXER

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WM8776
24-bit, 192kHz Stereo Codec with 5 Channel I/P Multiplexer
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.
BLOCK DIAGRAM
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
APPLICATIONS
• Surround Sound AV Processors and Hi-Fi systems
• DVD-RW
AINOPL
AINVGL
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
AINVGR
AINOPR
VMID
STEREO
ADC
AUDIO INTERFACE
ALC
AND
DIGITAL FILT_zERS
STEREO
DAC
CONTROL INTERFACE
LOW
PASS
FILTERS
VOUTL
VOUTR
HPVDD
HPOUTL
HPOUTR
HPGND
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WM8776
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
Product Preview, June 2004, Rev 1.91
Copyright 2004 Wolfson Microelectronics plc