WM8706_05 Datasheet, PDF (1/26 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz Stereo DAC with Volume Control

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WM8706
24-bit, 192kHz Stereo DAC with Volume Control
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.
BLOCK DIAGRAM
FEATURES
• Stereo DAC
• Audio Performance
- 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
- I²S, Left, Right Justified, DSP
- 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
APPLICATIONS
• DVD-Audio and DVD ‘Universal’ Players
• Home theatre systems
• Digital TV
• Digital broadcast receivers
MODE MLIIS MCDM1 MDDM0 MUTEB CSBIWO ZERO
CONTROL INTERFACE
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WM8706
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
MUTE/
ATTEN
MUTE/
ATTEN
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
RIGHT
DAC
LEFT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
VOUTR
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