Wolfson WM8742 24位音频立体声DAC方案
Wolfson公司的WM8742是非常高性能的24位音频立体声DAC,设计用于专业录音系统,A/V接收器和高档CD,DVD和家庭影院. WM8742支持PCM数据输入,字长度从16位到32位,取样速率高达192kHz,同时还支持DSD比特流数据格式,包括直接的DSD和从PCM转换来的DSD格式. WM8742的功能还包括精细的音量控制和软静音控制,数字去加重以及各种高档数字滤波器响应,随后是数字内插滤波器,多比特sigma delta调制器和立体声DAC.本文介绍了WM8742的`主要特性,方框图, 外接元件连接图和外接滤波器电路图.
WM8742: 24-bit 192kHz DAC with Advanced Digital Filtering
The WM8742 is a very high performance stereo DAC designed for audio applications such as professional recording systems, A/V receivers and high specification CD, DVD and home theatre systems. The device supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8742 also supports DSD bitstream data format, in both direct DSD and PCM-converted DSD modes.
The WM8742 includes fine resolution volume and soft mute control, digital de-emphasis and a range of advanced digital filter responses, followed by a digital interpolation filter,
multi-bit sigma delta modulator and stereo DAC. Wolfson’s patented architecture optimises the linearity of the DAC and provides maximum insensitivity to clock jitter.
The digital filters include several selectable roll-off and performance characteristics. The user can select between standard sharp or slow roll-off responses. In addition, the
WM8742 includes a selection of advanced digital filter characteristics including non-half band filters and minimum phase filters.
This flexibility provides a range of benefits, such as significantly reduced pre-ringing and minimal group delay. The internal digital filters can also be by-passed and the WM8742 used with an external digital filter.
The WM8742 supports two connection schemes for audio DAC control. The 2/3 wire serial control interface provides access to all features. A range of features can also be accessed by hardware control interface.
The WM8742 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740 and WM8741.
WM8742主要特性:
Advanced Ultra High Performance Multi-bit Sigma-Delta
Architecture
126dB SNR (‘A’-weighted mono @ 48kHz)
123dB SNR (‘A’-weighted stereo @ 48kHz)
121dB SNR (non-weighted stereo @ 48kHz)
100dB THD @ 48kHz
Differential analogue voltage outputs
High tolerance to clock jitter
PCM Mode
Sampling frequency: 32kHz to 192kHz
Input data word length support: 16 to 32-bit
Supports all standard audio interface formats
Selectable advanced digital filter responses
Includes linear/minimum phase and range of tailored characteristics
Enables low pre-ringing, minimal latency
Optional interface to industry standard external filters
Digital volume control in 0.125dB steps with soft ramp and soft mute
Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB
Selectable de-emphasis support
Zero Flag output
DSD Mode
DSD bit-stream support for SACD applications
Support for normal or phase modulated bit-streams
Direct or PCM converted DSD paths (DSD Plus)
DSD mute
Hardware or software control modes:
2 and 3 wire serial control interface support
Pin compatible with WM8740 and WM8741
4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
28-lead SSOP Package
应用:
Professional audio systems
CD, DVD, SACD audio
Home theatre systems
A/V receivers
图1.WM8742方框图
图2.WM8742外接元件连接图
图3. WM8742外接滤波器电路图
WM8742: 24-bit 192kHz DAC with Advanced Digital Filtering
The WM8742 is a very high performance stereo DAC designed for audio applications such as professional recording systems, A/V receivers and high specification CD, DVD and home theatre systems. The device supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8742 also supports DSD bitstream data format, in both direct DSD and PCM-converted DSD modes.
The WM8742 includes fine resolution volume and soft mute control, digital de-emphasis and a range of advanced digital filter responses, followed by a digital interpolation filter,
multi-bit sigma delta modulator and stereo DAC. Wolfson’s patented architecture optimises the linearity of the DAC and provides maximum insensitivity to clock jitter.
The digital filters include several selectable roll-off and performance characteristics. The user can select between standard sharp or slow roll-off responses. In addition, the
WM8742 includes a selection of advanced digital filter characteristics including non-half band filters and minimum phase filters.
This flexibility provides a range of benefits, such as significantly reduced pre-ringing and minimal group delay. The internal digital filters can also be by-passed and the WM8742 used with an external digital filter.
The WM8742 supports two connection schemes for audio DAC control. The 2/3 wire serial control interface provides access to all features. A range of features can also be accessed by hardware control interface.
The WM8742 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740 and WM8741.
WM8742主要特性:
Advanced Ultra High Performance Multi-bit Sigma-Delta
Architecture
126dB SNR (‘A’-weighted mono @ 48kHz)
123dB SNR (‘A’-weighted stereo @ 48kHz)
121dB SNR (non-weighted stereo @ 48kHz)
100dB THD @ 48kHz
Differential analogue voltage outputs
High tolerance to clock jitter
PCM Mode
Sampling frequency: 32kHz to 192kHz
Input data word length support: 16 to 32-bit
Supports all standard audio interface formats
Selectable advanced digital filter responses
Includes linear/minimum phase and range of tailored characteristics
Enables low pre-ringing, minimal latency
Optional interface to industry standard external filters
Digital volume control in 0.125dB steps with soft ramp and soft mute
Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB
Selectable de-emphasis support
Zero Flag output
DSD Mode
DSD bit-stream support for SACD applications
Support for normal or phase modulated bit-streams
Direct or PCM converted DSD paths (DSD Plus)
DSD mute
Hardware or software control modes:
2 and 3 wire serial control interface support
Pin compatible with WM8740 and WM8741
4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
28-lead SSOP Package
应用:
Professional audio systems
CD, DVD, SACD audio
Home theatre systems
A/V receivers
图1.WM8742方框图
图2.WM8742外接元件连接图
图3. WM8742外接滤波器电路图
相关推荐
3V DAC在±10V中的应用
DAC
2011-08-03
在线研讨会
焦点