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WM8742 Dataheets PDF



Part Number WM8742
Manufacturers Wolfson Microelectronics
Logo Wolfson Microelectronics
Description 24-bit 192kHz DAC
Datasheet WM8742 DatasheetWM8742 Datasheet (PDF)

w WM8742 24-bit 192kHz DAC with Advanced Digital Filtering DESCRIPTION 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 resolutio.

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w WM8742 24-bit 192kHz DAC with Advanced Digital Filtering DESCRIPTION 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. FEATURES  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, 3.15V to 3.6V digital supply operation  28-lead SSOP Package APPLICATIONS  Professional audio systems  CD, DVD, SACD audio  Home theatre systems  A/V receivers WOLFSON MICROELECTRONICS plc Production Data, February 2013, Rev 4.3 Copyright 2013 Wolfson Microelectronics plc PD, Rev 4.3, February 2013 2 w MCLK AVDDR AGNDR AVDD AGND PCM/DSD MUX MUTEB/SDOUT MODE/LRSEL CSB/SADDR/I2S SDIN/DEEMPH SCLK/DSD ZFLAG DIFFHW AVDDL AGNDL WM8742 BLOCK DIAGRAM Production Data Production Data WM8742 TABLE OF CONTENTS DESCRIPTION....................................................................................................... 1  FEATURES ............................................................................................................ 1  APPLICATIONS..................................................................................................... 1  BLOCK DIAGRAM ................................................................................................ 2  TABLE OF CONTENTS......................................................................................... 3  PIN CONFIGURATION .......................................................................................... 4  ORDERING INFORMATION.................................................................................. 4  PIN DESCRIPTION (SOFTWARE CONTROL MODE).......................................... 5  PIN DESCRIPTION (HARDWARE CONTROL MODE)......................................... 7  ABSOLUTE MAXIMUM RATINGS ........................................................................ 9  THERMAL PERFORMANCE................................................................................. 9  RECOMMENDED OPERATING CONDITIONS................................................... 10  ELECTRICAL CHARACTERISTICS ................................................................... 10  MASTER CLOCK TIMING............................................................................................. 12  PCM DIGITAL AUDIO INTERFACE TIMINGS .............................................................. 12  DSD AUDIO INTERFACE TIMINGS..............................


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