WM8775 Datasheet, PDF (1/36 Pages) Wolfson Microelectronics plc – 24 BIT 96 KHZ ADC WITH 4 CHANNEL I/P MULTIPLEXER

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WM8775
24-bit, 96kHz ADC with 4 Channel I/P Multiplexer
DESCRIPTION
The WM8775 is a high performance, stereo audio ADC
with a 4 channel input mixer. The WM8775 is ideal for
digitising multiple analogue sources for surround sound
processing applications for home hi-fi, automotive and
other audio visual equipment.
A stereo 24-bit multi-bit sigma delta ADC is used with a
four stereo channel input selector. Each channel has
programmable gain control. Digital audio output word
lengths from 16-32 bits and sampling rates from 32kHz
to 96kHz are supported.
The audio data interface supports I²S, left justified, right
justified and DSP digital audio formats.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
channel selection, volume controls, mutes, de-emphasis
and power management facilities.
The device is available in a 28-pin SSOP package. The
WM8775 is software compatible with the WM8776.
BLOCK DIAGRAM
FEATURES
• Audio Performance
− 102dB SNR (‘A’ weighted @ 48kHz)
− -90dB THD
• ADC Sampling Frequency: 32kHz – 96kHz
• Four stereo ADC inputs with analogue gain adjust from
+24dB to –21dB in 0.5dB steps
• Digital gain adjust from -21.5dB to -103dB.
• Programmable Automatic Level Control (ALC) or Limiter on
ADC input
• 3-Wire SPI Compatible or 2-wire 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
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
• 5V tolerant digital inputs
APPLICATIONS
• Surround Sound AV Processors and Hi-Fi systems
• Automotive Audio
AINOPL
AINOPR
AINVGL
AINVGR
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
VMID
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WM8775
STEREO
ADC
AUDIO INTERFACE
ALC
AND
DIGITAL FILTERS
MCLK
DOUT
ADCLRC
BCLK
CONTROL INTERFACE
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
Product Preview, June 2004, Rev 1.8
Copyright 2004 Wolfson Microelectronics plc