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DESCRIPTION
The WM8770 is a high performance, multi-channel audio
codec. The WM8770 is ideal 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.
Four stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8kHz
to 192kHz are supported. Each DAC channel has
independent analogue volume and mute control, with a set
of input multiplexors allowing selection of an external 3
channel stereo analogue input into these volume controls.
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-lead
TQFP package.
WM8770
24-bit, 192kHz 8-Channel Codec with Volume Control
FEATURES
•
Audio Performance
−
106dB SNR (‘A’ weighted @ 48kHz) DAC
−
102dB SNR (‘A’ weighted @ 48kHz) ADC
DAC Sampling Frequency: 8KHz – 192kHz
ADC Sampling Frequency: 8KHz – 96kHz
3-Wire SPI or CCB 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
Four Independent stereo DAC outputs with independent
analogue and digital volume controls
Analogue Bypass Path Feature
Six channel selectable AUX input to the volume controls
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
•
•
•
•
•
•
•
•
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•
APPLICATIONS
•
•
Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
DACREFP1
DACREFP2
VMIDDAC
AGND2
BLOCK DIAGRAM
VMIDADC
REFADC
ZFLAG1
AINVGR
ZFLAG2
AINVGL
AGND1
AVDD1
MCLK
DOUT
ADCLRC
BCLK
DACLRC
DIN1
DIN2
DIN3
DIN4
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
AIN6L
AIN6R
AIN7L
AIN7R
AIN8L
AIN8R
INPUT SOURCE SELECTOR
STEREO
DAC
AVDD2
LOW
PASS
FILTERS
VOUT1L
VOUT1R
VOUT2L
VOUT2R
VOUT3L
VOUT3R
VOUT4L
VOUT4R
AUDIO INTERFACE
STEREO
ADC
AND
DIGITAL FILTERS
STEREO
DAC
LOW
PASS
FILTERS
STEREO
DAC
LOW
PASS
FILTERS
STEREO
DAC
LOW
PASS
FILTERS
AINOPL
AINOPR
RECL
RECR
MUTE
CONTROL INTERFACE
W
WM8770
GR1
GR2
AUX1L
AUX1R
AUX2L
AUX2R
AUX3L
AUX3R
RESETB
CE
DGND
CCB is a trademark of SANYO ELECTRIC CO., LTD
DVDD
CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.
WOLFSON MICROELECTRONICS plc
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CL
DI
Production Data, June 2005, Rev 4.1
Copyright
2005
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
