WM8706
24-bit, 192kHz Stereo DAC with Volume Control
Product Preview, Rev 1.2, April 2001
DESCRIPTION
FEATURES
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Stereo DAC
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-pin SSOP
package. The WM8706 also includes a digitally controllable
mute and attenuate function on each channel.
Audio Performance
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106dB SNR (‘A’ weighted @ 48kHz) DAC
-97dB THD
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DAC Sampling Frequency: 8kHz – 192kHz
3-Wire Serial Control Interface or Hardware Control
Programmable Audio Data Interface Modes
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I2S, Left, Right Justified, DSP
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16/20/24/32 bit Word Lengths
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.
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Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps
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3.0V – 5.5V Supply Operation
28-Pin SSOP Package
Exceeds Dolby Class A Performance Requirements
APPLICATIONS
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.
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DVD-Audio and DVD ‘Universal’ Players
Home theatre systems
Digital TV
Digital broadcast receivers
BLOCK DIAGRAM
MLIIS
MCDM1 MDDM0 MUTEB CSBIWO ZERO
MODE
WM8706
CONTROL INTERFACE
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
RIGHT
DAC
MUTE/
ATTEN
VOUTR
VOUTL
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
LEFT
DAC
MUTE/
ATTEN
VMID
XTI
DGND
AVDD DVDD
VREFP VREFN AGND
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Product Preview data sheets contain
specifications for products in the formative
phase of development. These products may
be changed or discontinued without notice.
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
www.wolfsonmicro.com
2001 Wolfson Microelectronics Ltd.