WM8770
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24-bit, 192kHz 8-Channel Codec with Volume Control
DESCRIPTION
FEATURES
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Audio Performance
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.
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106dB SNR (‘A’ weighted @ 48kHz) DAC
102dB SNR (‘A’ weighted @ 48kHz) ADC
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DAC Sampling Frequency: 8KHz – 192kHz
ADC Sampling Frequency: 8KHz – 96kHz
3-Wire SPI or CCB MPU Serial Control Interface
Master or Slave Clocking Mode
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.
Programmable Audio Data Interface Modes
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I2S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
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.
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Four Independent stereo DAC outputs with independent
analogue and digital volume controls
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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
The audio data interface supports I2S, left justified, right
justified and DSP digital audio formats.
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2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
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.
5V tolerant digital inputs
APPLICATIONS
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Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
BLOCK DIAGRAM
AIN1L
AIN1R
STEREO
DAC
VOUT1L
VOUT1R
LOW
PASS
FILTERS
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
STEREO
DAC
VOUT2L
VOUT2R
LOW
PASS
FILTERS
AUDIO INTERFACE
AND
AIN5L
AIN5R
STEREO
ADC
AIN6L
AIN6R
AIN7L
AIN7R
STEREO
DAC
VOUT3L
VOUT3R
DIGITAL FILTERS
LOW
PASS
FILTERS
AIN8L
AIN8R
VOUT4L
VOUT4R
LOW
PASS
FILTERS
STEREO
DAC
AINOPL
AINOPR
W
RECL
RECR
CONTROL INTERFACE
MUTE
WM8770
CCB is a trademark of SANYO ELECTRIC CO., LTD
CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.
WOLFSON MICROELECTRONICS plc
Production Data, June 2005, Rev 4.1
Copyright 2005 Wolfson Microelectronics plc
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