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DESCRIPTION
The WM8706 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8706 supports data input word
lengths from 16 to 32-bits and sampling rates up to 192kHz.
The WM8706 can implement 2 channels at 192kHz for high-
end DVD-Audio. The WM8706 consists of a serial interface
port, digital interpolation filters, multi-bit sigma delta
modulators and stereo DAC in a small 28-lead SSOP
package. The WM8706 also includes a digitally controllable
mute and attenuate function on each channel.
The WM8706 supports a variety of connection schemes for
audio DAC control. The MPU serial port provides access to
a wide range of features including on-chip mute, attenuation
and phase reversal. A hardware controllable interface is
also available. It is pin-compatible with the WM8716
provided the oscillator circuit on WM8716 is not required in
the application.
The WM8706 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players supporting DVD-A.
WM8706
24-bit, 192kHz Stereo DAC with Volume Control
FEATURES
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Stereo DAC
Audio Performance
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•
•
•
106dB SNR (‘A’ weighted @ 48kHz) DAC
-
-97dB THD
DAC Sampling Frequency: 8kHz – 192kHz
3-Wire Serial Control Interface or Hardware Control
Programmable Audio Data Interface Modes
-
I
2
S, Left, Right Justified, DSP
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16/20/24/32 bit Word Lengths
Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps
3.0V – 5.5V Supply Operation
28-Lead SSOP Package
Exceeds Dolby Class A Performance Requirements
•
•
•
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APPLICATIONS
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•
•
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DVD-Audio and DVD ‘Universal’ Players
Home theatre systems
Digital TV
Digital broadcast receivers
BLOCK DIAGRAM
MODE
MLIIS
MCDM1 MDDM0 MUTEB CSBIWO
ZERO
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CONTROL INTERFACE
WM8706
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
MUTE/
ATTEN
DIGITAL FILTERS
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
RIGHT
DAC
LOW
PASS
FILTER
VOUTR
SIGMA
DELTA
MODULATOR
LEFT
DAC
LOW
PASS
FILTER
VOUTL
VMID
XTI
AVDD DVDD
VREFP VREFN AGND
DGND
WOLFSON MICROELECTRONICS plc
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Production Data, July 2005, Rev 4.1
Copyright
2005
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
