WM8741

w DESCRIPTION The WM8741 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 WM8741 also supports DSD bitstream data format, in both direct DSD and PCM-converted DSD modes. The WM8741 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 WM8741 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 WM8741 used with an external digital filter. The WM8741 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 WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740. WM8741 24-bit 192kHz DAC with Advanced Digital Filtering FEATURES • Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture − 128dB SNR (‘A’-weighted mono @ 48kHz) − 125dB SNR (‘A’-weighted stereo @ 48kHz) − 123dB 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 4.5V to 5.5V analogue, 3.0V 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 To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Product Preview, October 2007, Rev 1.3 Copyright ©2007 Wolfson Microelectronics plc WM8741 BLOCK DIAGRAM Product Preview CONTROL INTERFACE PCM ATTENUATION / MUTE PCM PCM DIGITAL FILTERS BCLK/DSD64CLK FSEL/DINR DIN/DINL LRCLK/DSDL/DSDIN IWO/DOUT OSR/DSDR DSD TO PCM CONVERTOR DSD DSD ATTENUATION / MUTE AUDIO INTERFACE SIGMA DELTA MODULATOR VMIDL PCM ATTENUATION / MUTE SIGMA DELTA MODULATOR VOUTLP DAC LEFT VOUTLN VOUTRP DAC RIGHT VOUTRN W WM8741 VMIDR w PP Rev 1.3 October 2007 2 Product Preview WM8741 TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................2 TABLE OF CONTENTS .........................................................................................3 PIN CONFIGURATION...........................................................................................5 ORDERING INFORMATION ..................................................................................5 PIN DESCRIPTION (SOFTWARE CONTROL MODE) ..........................................6 PIN DESCRIPTION (HARDWARE CONTROL MODE)..........................................8 ABSOLUTE MAXIMUM RATINGS.......................................................................10 THERMAL PERFORMANCE ...............................................................................10 RECOMMENDED OPERATING CONDITIONS ...................................................11 ELECTRICAL CHARACTERISTICS ....................................................................11 MASTER CLOCK TIMING ........................................................................................... 13 PCM DIGITAL AUDIO INTERFACE TIMINGS............................................................. 13 DSD AUDIO INTERFACE TIMINGS............................................................................ 14 CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 15 CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 16 INTERNAL POWER ON RESET CIRCUIT.................................................................. 17 DEVICE DESCRIPTION.......................................................................................19 INTRODUCTION ......................................................................................................... 19 CLOCKING SCHEMES ............................................................................................... 19 CONTROL INTERFACE.............................................................................................. 19 SOFTWARE CONTROL INTERFACE......................................................................... 20 3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE ....................................................................................................... 20 3-WIRE CONTROL INTERFACE DAISY CHAINING............................................................................................................... 20 2-WIRE SERIAL CONTROL MODE ................................................................................................................................... 22 DIGITAL AUDIO INTERFACE ..................................................................................... 22 PCM MODE ................................................................................................................................................................. 22 PCM DIGITAL AUDIO INTERFACE ................................................................................................................................... 23 LEFT JUSTIFIED MODE .................................................................................................................................................. 23 RIGHT JUSTIFIED MODE ................................................................................................................................................ 24 I S MODE .................................................................................................................................................................... 24 DSP MODE A .............................................................................................................................................................. 25 DSP MODE B .............................................................................................................................................................. 25 PCM MODE SAMPLING RATES ...................................................................................................................................... 25 8FS MODE .................................................................................................................................................................. 26 8FS MODE SAMPLING RATES ....................................................................................................................................... 27 AUDIO INTERFACE DAISY CHAINING ............................................................................................................................... 27 2 DSD MODE ................................................................................................................. 28 DSD DIRECT ............................................................................................................................................................... 28 DSD PLUS MODE ......................................................................................................................................................... 28 DSD DIGITAL AUDIO INTERFACE ................................................................................................................................... 28 SOFTWARE CONTROL MODE .................................................................................. 29 DSD AND PCM MODE SWITCHING ................................................................................................................................ 29 PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS .................................................................................................. 29 LRCLK POLARITY ........................................................................................................................................................ 30 w PP Rev 1.3 October 2007 3 WM8741 Product Preview BCLK / DSDCLK64 POLARITY ..................................................................................................................................... 30 OVERSAMPLING RATE CONTROL ................................................................................................................................... 30 MCLK/LRCLK RATIO CONTROL (NORMAL PCM MODE) ................................................................................................. 31 8FS MODE .................................................................................................................................................................. 31 MCLK/LRCLK RATIO CONTROL (8FS MODE)................................................................................................................ 31 ATTENUATION CONTROL ............................................................................................................................................... 31 DAC OUTPUT ATTENUATION ......................................................................................................................................... 32 ATTENUATION CONTROL MODE ..................................................................................................................................... 32 VOLUME RAMP MODE................................................................................................................................................... 33 ANTI-CLIPPING DIGITAL ATTENUATION MODE.................................................................................................................. 33 DSD PLUS GAIN CONTROL ........................................................................................................................................... 33 MUTE MODES .............................................................................................................................................................. 34 ZERO FLAG OUTPUT .................................................................................................................................................... 35 ZFLAG FORCE HIGH CONTROL .................................................................................................................................... 35 INFINITE ZERO DETECT................................................................................................................................................. 35 DE-EMPHASIS .............................................................................................................................................................. 36 OUTPUT PHASE REVERSAL ........................................................................................................................................... 36 DIFFERENTIAL MONO MODE .......................................................................................................................................... 37 DITHER ....................................................................................................................................................................... 37 NORMAL PCM MODE DIGITAL FILTER SELECTION ........................................................................................................... 38 8FS MODE DIGITAL FILTER ........................................................................................................................................... 38 DSD PLUS FILTER SELECTION ...................................................................................................................................... 38 DSD DIRECT DIGITAL FILTER ........................................................................................................................................ 38 DSD MUTE CONTROL .................................................................................................................................................. 39 POWER SAVING STANDBY CONTROL ............................................................................................................................. 39 HARDWARE CONTROL MODE.................................................................................. 39 DSD AND PCM MODE SWITCHING ............................................................................................................................... 39 AUDIO INPUT FORMAT .................................................................................................................................................. 39 OVERSAMPLING RATE CONTROL ................................................................................................................................... 40 MUTE PIN .................................................................................................................................................................... 40 ZERO FLAG............................................................................................................................................................... 41 DE-EMPHASIS CONTROL AND ANTI-CLIPPING MODE ........................................................................................................ 41 DIGITAL FILTER SELECTION........................................................................................................................................... 42 DIFFERENTIAL MONO MODE .......................................................................................................................................... 42 OVERVIEW OF FUNCTIONS...............................................................................43 REGISTER MAP...................................................................................................44 REGISTER MAP...................................................................................................44 DIGITAL FILTER CHARACTERISTICS ...............................................................49 PCM MODE FILTER CHARACTERISTICS ................................................................. 49 8FS MODE FILTER CHARACTERISTICS................................................................... 51 DSD PLUS MODE FILTER CHARACTERISTICS ....................................................... 52 DSD DIRECT MODE FILTER CHARACTERISTICS ................................................... 52 PCM MODE FILTER RESPONSES............................................................................. 53 8FS MODE FILTER RESPONSES .............................................................................. 58 DSD PLUS MODE FILTER RESPONSES................................................................... 58 DSD DIRECT MODE FILTER RESPONSES............................................................... 59 DEEMPHASIS FILTER RESPONSES ......................................................................... 60 APPLICATIONS INFORMATION .........................................................................61 PACKAGE DIMENSIONS ....................................................................................62 IMPORTANT NOTICE ..........................................................................................63 ADDRESS: .................................................................................................................. 63 w PP Rev 1.3 October 2007 4 Product Preview WM8741 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8741GEDS W M8741GEDS/R TEMPERATURE RANGE -25° to +85°C -25° to +85°C PACKAGE 28-lead SSOP (Pb-free) 28-lead SSOP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL 1 MSL 1 PEAK SOLDERING TEMPERATURE 260˚C 260˚C Note: Reel Quantity = 2,000 w PP Rev 1.3 October 2007 5 WM8741 PIN DESCRIPTION (SOFTWARE CONTROL MODE) PIN NAME TYPE PCM MODE 1 2 3 4 5 6 LRCLK / DSDL DIN / DINL BCLK / DSD64CLK FSEL / DINR MCLK DIFFHW Digital input Digital input Digital input Digital input Tri-level Digital input Digital input Internal pulldown Audio interface left/right clock input Audio interface data input Audio interface bit clock input Unused Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Unused Buffered audio interface data output DESCRIPTION 8FS PCM MODE Audio interface left/right clock input Audio interface left data input Audio interface bit clock input Audio interface right data input Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Unused Unused Product Preview DSD MODES DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output DSD right audio data in Unused 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 DGND DVDD AVDDR AGNDR VMIDR VOUTRP VOUTRN AGND AVDD VOUTLN VOUTLP VMIDL AGNDL AVDDL ZFLAG OSR/DSDR IWO / DOUT Supply Supply Analogue Input Analogue Input Analogue Output Analogue Output Analogue Output Supply Supply Analogue Output Analogue Output Analogue Output Analogue Input Analogue Input Digital Output Digital input Tri-level Digital input/output w PP Rev 1.3 October 2007 6 Product Preview PIN NAME TYPE PCM MODE 24 MODE / LRSEL Digital input, tri-level When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation NOTE: In 3-wire mode only, this pin may be used as a buffered control interface data output Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select DESCRIPTION 8FS PCM MODE When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation WM8741 DSD MODES When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softute Control 0 = mute active 1 = normal operation NOTE: In DSD Direct mode this is an analogue mute 25 MUTEB / SDOUT Digital input or output: Internal pull-up 26 27 28 SDIN / DEEMPH SCLK / DSD CSB / SADDR / I 2S Digital input Tri-level Digital input Digital input Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select Serial control interface data input Serial control interface clock input 3-wire mode: serial control interface latch 2-wire mode: device address select Notes: 1. 2. Undefined inputs should be connected to DVDD or DGND Tri-level pins which require the ‘Z’ state to be selected should be left floating (open) w PP Rev 1.3 October 2007 7 WM8741 PIN DESCRIPTION (HARDWARE CONTROL MODE) PIN NAME TYPE PCM MODE 1 2 3 4 5 6 LRCLK / DSDL DIN / DINL BCLK / DSD64CLK FSEL / DINR MCLK DIFFHW Digital input Digital input Digital input Digital input Tri-level Digital input Digital input Internal pulldown Supply Supply Analogue Input Analogue Input Analogue Output Analogue Output Analogue Output Supply Supply Analogue Output Analogue Output Analogue Output Analogue Input Analogue Input Digital Output Digital input Tri-level Audio interface left/right clock input Audio interface data input Audio interface bit clock input Selects between one of three digital filters – see Table 48 Master clock input Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output Controls internal oversampling rate: 0 = low rate Z = medium rate 1 = high rate Controls audio interface wordlength – see Table 44 DESCRIPTION Product Preview DSD DIRECT MODE DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection 0 = normal operation 1 = differential mono mode Digital ground Digital supply Right analogue positive reference Right analogue negative reference Right analogue midrail decoupling pin Right DAC positive output Right DAC negative output Analogue ground Analogue supply Left DAC negative output Left DAC positive output Left analogue midrail decoupling pin Left analogue negative reference Left analogue positive reference Zero flag output DSD right audio data in 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DGND DVDD AVDDR AGNDR VMIDR VOUTRP VOUTRN AGND AVDD VOUTLN VOUTLP VMIDL AGNDL AVDDL ZFLAG OSR/DSDR 23 IWO / DOUT Digital input/output Unused w PP Rev 1.3 October 2007 8 Product Preview PIN NAME TYPE PCM MODE 24 MODE / LRSEL Digital input, tri-level When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Softmute Control 0 = mute active 1 = normal operation De-emphasis Control 0 = normal operation 1 = de-emphasis applied Z = anti-clipping digital filter mode HW Mode Select: 0 = PCM 1 = DSD Direct Controls audio interface format – see Table 44 DESCRIPTION WM8741 DSD DIRECT MODE When DIFFHW=0: 0 = hardware mode 1 = 3-wire software mode Z = 2-wire software mode When DIFFHW=1: 0 = left channel mono 1 = right channel mono Analogue Mute Control 0 = mute active 1 = normal operation Unused 25 MUTEB / SDOUT Digital input or output: Internal pull-up Digital input Tri-level 26 SDIN / DEEMPH 27 SCLK / DSD CSB / SADDR / I 2S Digital input HW Mode Select: 0 = PCM 1 = DSD Direct Unused 28 Digital input Notes: 1. 2. Undefined inputs should be connected to DVDD or DGND Tri-level pins who require the ‘Z’ state to be selected should be left floating (open) w PP Rev 1.3 October 2007 9 WM8741 ABSOLUTE MAXIMUM RATINGS Product Preview Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson Microelectronics tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at