WM8773
24-bit, 96kHz ADC with 8 Channel I/P Multiplexer
DESCRIPTION
The WM8773 is a high performance, stereo audio ADC with
an 8 channel input selector. The WM8773 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 an
eight stereo channel input selector. Each channel has
analogue domain mute and programmable gain control.
Digital audio output word lengths from 16-32 bits and
sampling rates from 8kHz to 96kHz are supported.
The audio data interface supports I
2
S, left justified, right
justified and DSP digital audio formats.
The device is controlled via a 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 64-pin
TQFP package.
FEATURES
•
•
•
•
•
Audio Performance
−
102dB SNR (‘A’ weighted @ 48kHz) ADC
ADC Sampling Frequency: 8kHz – 96kHz
3-Wire SPI MPU 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 Record Monitor Outputs
Eight stereo ADC inputs with analogue gain adjust from
+19dB to –12dB in 1dB steps
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
BLOCK DIAGRAM
VMIDADC
AINVGR
AGND1
AVDD1
REFADC
AINVGL
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
AIN6L
AIN6R
AIN7L
AIN7R
AIN8L
AIN8R
WM8773
INPUT SOURCE SELECTOR
AUDIO INTERFACE
STEREO
ADC
AND
DIGITAL FILTERS
MCLK
DOUT
ADCLRC
BCLK
AINOPL
AINOPR
RECL
RECR
MUTE
CONTROL INTERFACE
CL
CE
DGND
DVDD
WOLFSON MICROELECTRONICS LTD
w :: www.wolfsonmicro.com
RESETB
DI
Product Preview, April 2002, Rev 1.0
Copyright
2002
Wolfson Microelectronics Ltd.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
