WM8741 Wolfson Microelectronics plc, WM8741 Datasheet
WM8741
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WM8741 Summary of contents
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... 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 bit- stream data format, in both direct DSD and PCM-converted DSD modes. ...
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... OSR/DSDR DSD w CONTROL INTERFACE PCM SIGMA DELTA ATTENUATION / MODULATOR MUTE PCM DIGITAL FILTERS PCM SIGMA DELTA ATTENUATION / MODULATOR MUTE DSD DSD TO PCM ATTENUATION / CONVERTOR MUTE WM8741 Production Data VMIDL VOUTLP DAC LEFT VOUTLN VOUTRP DAC RIGHT VOUTRN VMIDR PD, Rev 4.1, August 2009 2 ...
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... MODE FILTER CHARACTERISTICS .................................................................... 52 DSD PLUS MODE FILTER CHARACTERISTICS ......................................................... 53 PCM MODE FILTER RESPONSES .............................................................................. 54 8FS MODE FILTER RESPONSES ................................................................................ 59 DSD PLUS MODE FILTER RESPONSES .................................................................... 59 DSD DIRECT MODE FILTER RESPONSES ................................................................ 60 DEEMPHASIS FILTER RESPONSES........................................................................... 62 APPLICATIONS INFORMATION ........................................................................ 63 PACKAGE DIMENSIONS .................................................................................... 64 IMPORTANT NOTICE ......................................................................................... 65 ADDRESS: .................................................................................................................... 65 w TABLE OF CONTENTS WM8741 PD, Rev 4.1, August 2009 3 ...
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... WM8741 PIN CONFIGURATION ORDERING INFORMATION TEMPERATURE DEVICE RANGE WM8741GEDS/V -40° to +85°C WM8741GEDS/RV -40° to +85°C Note: Reel Quantity = 2,000 w MOISTURE SENSITIVITY PACKAGE 28-lead SSOP (Pb-free) 28-lead SSOP (Pb-free, tape and reel) Production Data PEAK SOLDERING LEVEL TEMPERATURE MSL2 260˚C MSL2 260˚ ...
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... Left analogue positive reference reference Zero flag output Zero flag output Unused Unused Buffered audio interface Unused data output WM8741 DSD MODES DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection 0 = normal operation 1 = differential mono ...
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... WM8741 PIN NAME TYPE 24 MODE / Digital input, LRSEL tri-level 25 MUTEB / Digital input or output: SDOUT Internal pull-up 26 SDIN / Digital input DEEMPH Tri-level 27 SCLK / Digital input DSD 28 CSB / Digital input SADDR / Notes: 1. Undefined inputs should be connected to DVDD or DGND 2. Tri-level pins which require the ‘Z’ state to be selected should be left floating (open) ...
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... Left analogue positive reference Zero flag output Controls internal oversampling rate low rate Z = medium rate 1 = high rate Controls audio interface wordlength – see Table 46 WM8741 DSD DIRECT MODE DSD left audio data in Unused 64fs system clock input Unused Unused Differential mono mode selection ...
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... WM8741 PIN NAME TYPE 24 MODE / Digital input, LRSEL tri-level 25 MUTEB / Digital input or output: SDOUT Internal pull-up 26 SDIN / Digital input DEEMPH Tri-level 27 SCLK / Digital input DSD 28 CSB / Digital input SADDR / Notes: 1. Undefined inputs should be connected to DVDD or DGND 2. Tri-level pins who require the ‘Z’ state to be selected should be left floating (open) ...
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... Notes: 1. Analogue and digital grounds must always be within 0.3V of each other. THERMAL PERFORMANCE PARAMETER Thermal resistance – junction to case Thermal resistance – junction to ambient w SYMBOL TEST CONDITIONS θ JC θ JA WM8741 MIN MAX -0.3V +4.5V -0.3V +7V DGND - 0.3V DVDD + 0.3V AGND - 0.3V AVDD + 0.3V 38.462MHz -25°C +85°C -65°C +150°C -55° ...
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... WM8741 RECOMMENDED OPERATING CONDITIONS PARAMETER Digital supply range Analogue supply range Ground AGND, DGND Difference DGND to AGND Analogue operating current Digital operating current Analogue standby current I Digital standby current I ELECTRICAL CHARACTERISTICS TEST CONDITIONS AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, T stated. PARAMETER SYMBOL ...
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... MIN -3dB 20kHz Into 10kΩ load, 0dBFS input Into 10kΩ load, 0dB input DSD Into 10kΩ load, 0dB input DSD To midrail or AC coupled AVDD to VMIDL/VMIDR and VMIDL/VMIDR to AGND WM8741 TYP MAX UNIT 474 kHz -0.0077 RMS 0.948 V ...
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... WM8741 MASTER CLOCK TIMING Figure 1 Master Clock Timing Requirements Test Conditions AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, T PARAMETER Master Clock Timing Information MCLK Master clock pulse width high MCLK Master clock pulse width low MCLK Master clock cycle time MCLK Duty cycle ...
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... DSDCLK64 rising edge Difference in edge timing DSD[0:1] to DSDCLK64 Table 3 DSD Audio Interface Timing Requirements w D[n] t 64CY 64L 44.1kHz, DSDCLK64 = 64fs unless otherwise stated. TEST CONDITIONS WM8741 t DH D[n+1] t 64H MIN TYP MAX UNIT 354.3 ns 140 ns 140 ...
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... WM8741 CONTROL INTERFACE TIMING – 3-WIRE MODE Figure 5 Control Interface Timing - 3-Wire Serial Control Mode Test Conditions o DVDD = 3.3V, GND = 0V +25 A PARAMETER SCLK rising edge to LATCH rising edge SCLK pulse cycle time SCLK pulse width low SCLK pulse width high SDIN to SCLK set-up time ...
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... Table 5 Control Interface Timing – 2-wire Serial Control Mode Slave Mode 48kHz, MCLK = 256fs unless otherwise stated. SYMBOL t SCL t SCH t HOL t CSE t DSU t RIS t FAL t CSS t DHO t PS WM8741 MIN TYP MAX UNIT 0 5 MHz 600 ns 600 ns 100 ns 300 ns 300 ns 600 ns 900 ...
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... WM8741 INTERNAL POWER ON RESET CIRCUIT The WM8741 includes two internal Power On Reset (POR) circuits which are used to reset the digital logic into a default state after power up and to allow the analogue circuits to power-up silently. The digital POR circuit is powered from DVDD. This circuit monitors DVDD and asserts the internal digital reset if DVDD are below the minimum DVDD threshold which will allow the digital logic to function ...
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... Internal Analogue PORB indicates device ready, normal operation is not possible until the VMID pin has reached the midrail voltage +125 -25 C, DVDD A_max A_min TEST CONDITIONS Measured from DGND Measured from DGND WM8741 = 3.6V, DVDD = 3.0V max min MIN TYP MAX 1.86 1.83 PD, Rev 4.1, August 2009 UNIT ...
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... WM8741 DEVICE DESCRIPTION INTRODUCTION The WM8741 is an ultra high performance DAC designed for digital audio applications. Its range of features makes it ideally suited for use in professional recording environments, CD/DVD players, AV receivers and other high-end consumer audio equipment. The WM8741 is a complete differential stereo audio digital-to-analogue converter. ...
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... D[8] is always set to zero 3-WIRE CONTROL INTERFACE DAISY CHAINING In daisy chaining mode, SDOUT (pin 25) outputs control data sampled on SDIN with a delay of 16 SCLK cycles. This data signal can be used to control another WM8741 in a daisy chain circuit as shown in Figure 10. Figure 10 Control Interface Daisy Chaining Setup To configure devices into daisy chain mode the CSB signal should be driven low while there is a register write to set register bit SDOUT=1 ...
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... All 1s will result in writing to a non-existent register, address 7Fh, preserving the current register settings. Figure 12 shows an example of how to access three WM8741 devices (the devices have all previously been configured in daisy chain mode): ...
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... WM8741 and the R/W bit is ‘0’, indicating a write, then the WM8741 responds by pulling SDIN low on the next clock pulse (ACK). recognised or the R/W bit is ‘1’, the WM8741 returns to the idle condition and wait for a new start condition and valid address. ...
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... Any mark-to-space ratio on LRCLK is acceptable provided the above requirements are met. The WM8741 will automatically detect when data with a LRCLK period of exactly 32 BCLKs is received, and select 16-bit mode. This overrides any previously programmed word length. The operating word length will revert to a programmed value only if a LRCLK period other than 32 BCLKs is detected ...
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... Figure 15 Right Justified Mode Timing Diagram MODE mode, the MSB is sampled on the second rising edge of BCLK following a LRCLK transition. LRCLK is low during the left data word and high during the right data word. Figure Mode Timing Diagram WM8741 PD, Rev 4.1, August 2009 23 ...
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... Figure 18 DSP Mode B Timing Diagram PCM MODE SAMPLING RATES The WM8741 supports master clock rates of 128fs to 768fs, where fs is the audio sampling frequency (LRCLK), typically 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz. The WM8741 has a master clock detection circuit that automatically determines the relationship between the master clock frequency and the sampling rate ...
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... The data can be input in two formats (left or right justified), selectable by register FMT[1:0], and two word lengths ( bit), selectable by register IWL[1:0]. In both modes the data is clocked into the WM8741 MSB first. For left justified data the word start is identified by the falling edge of LRCLK. The data is clocked in on the next 20/24 BCLK rising edges ...
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... When this output is connected to the DIN pin of the next device in the chain, each WM8741 device will simultaneously sample different channel data in the same LRCLK period. Daisy chaining is only available in DSP audio interface mode and is limited by a maximum BCLK frequency of 24 ...
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... Production Data DSD MODE The WM8741 supports DSD input bitstreams at 64x the oversampling rate. The data is supplied at a rate of 64 bits per normal word clock. In DSD, no word clock is provided. The WM8741 supports two channels of bitstream or DSD audio. Data bitstreams and the 64fs clock are supplied to pins 1, 22 and 3 respectively ...
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... WM8741 Figure 23 Bi-phase DSD Mode Timing Diagram SOFTWARE CONTROL MODE Software control allows access to all features of the WM8741. Selection of control mode is achieved by configuring the state of MODE/LRSEL (pin 24): PIN 24 Table 14 Control Mode Configuration DSD AND PCM MODE SWITCHING The audio interface mode can be switched between DSD and PCM by writing MODESEL[1:0] in R7. ...
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... Table 19 BCLK Polarity Control OVERSAMPLING RATE CONTROL The user has control of the oversampling ratio of the WM8741, and can set to the device to operate in low, medium or high rate modes. For correct operation of the digital filtering and other processing on the WM8741, the user must ensure the correct value of OSR[1:0] is set at all times. ...
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... Mode allows the use of custom digital filters by bypassing the WM8741 internal digital filters. When MODE8X is set, the PCM data input to the WM8741 is applied only to the digital volume control and then the analogue section of the DAC system, bypassing the digital filters. ...
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... Store RAT[9:5] and update attenuation on registers 0-3 ATTENUATION LEVEL 000(hex) 0dB 001(hex) -0.125dB : : : : : : -127.75dB 3FF(hex) -∞dB (mute) BIT LABEL R4 2 ATC 04h DESCRIPTION DEFAULT DESCRIPTION 0 Attenuator Control Mode Right channels use Right attenuation 1 = Right Channels use Left Attenuation PD, Rev 4.1, August 2009 WM8741 31 ...
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... Audio material is regularly recorded up to 0dB level and heavily compressed. This may cause clipping and occasional distortion when the digital media is applied to a DAC. In order to prevent this in the WM8741, an anti-clipping mode is provided, which attenuates the digital signal by 2dB processed through the digital filters. ...
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... Figure 24 Application and Release of Soft Mute Figure 24 shows the application and release of SOFTMUTE for a full amplitude sinusoid being played at 48kHz sampling rate. When SOFTMUTE (lower trace) is asserted, the WM8741 output (upper trace) begins to decay exponentially from the DC level of the last input sample. The output decays towards V previous value ...
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... The WM8741 has one zero flag output pin, ZFLAG (pin 21). The zero flag feature is only valid for PCM data. The WM8741 asserts Logic 1 on the ZFLAG pin when a sequence of more than 1024 zeros is input to the chip. The default value is a logical AND of both left and right channels. Under software control, the user can also set the zero flag pin to respond to either the left channel OR the right channel ...
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... Production Data MUTEB Figure 25 Software Control Mode MUTEB and ZFLAG Configuration DE-EMPHASIS Setting the DEEMPH[1:0] register bits enables de-emphasis support in the WM8741 digital filters. There are three de-emphasis filters, one each for sampling rates of 32kHz, 44.1kHz and 48kHz. REGISTER ADDRESS Filter Control ...
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... REGISTER ADDRESS Mode Control 2 Table 36 Differential Output Modes Using these controls a pair of WM8741 devices may be used to build a dual differential stereo implementation with higher performance and differential output. DITHER Dither is applied whenever internal truncation occurs also used when a 32 bit input word is applied to the DAC prior to truncation to the internal wordlength ...
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... Production Data NORMAL PCM MODE DIGITAL FILTER SELECTION The WM8741 has a number of advanced digital filters that can be selected in all PCM operation modes (with the exception of 8FS mode). REGISTER ADDRESS Filter Control Table 38 PCM Advanced Digital Filter Selection Five digital filters are available for selection in each of the three OSR modes (low, medium and high rate) as selected by the OSR bit described in Table 20 ...
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... Setting the PWDN register bit immediately connects all outputs the DAC system including the DLL, the audio interface and the DSP. Input data samples are not preserved, but all control register settings are maintained. When PWDN is cleared the WM8741 will repeat its power-on initialisation sequence. ...
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... Production Data HARDWARE CONTROL MODE When the MODE pin is held ‘low’ the WM8741 is set to hardware control mode and a limited feature set can be configured. PIN 24 Table 44 MODE/LRSEL Hardware Control Pin Function DSD AND PCM MODE SWITCHING The audio interface mode can be switched between DSD Direct and PCM by controlling the state of pin DSD ...
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... Table 47 OSR/DSDR Hardware Control Pin Function MUTE PIN A soft mute can be applied to the WM8741 in the digital domain in all PCM. A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of 1022x(4/fs). Setting MUTEB high will return the signal gain to its previous value. ...
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... Audio material is regularly recorded up to 0dB level and heavily compressed. This causes clipping and distortion when the digital media is applied to a DAC. In order to prevent this in the WM8741, an anti-clipping mode is provided, which attenuates the digital signal by 2dB processed through the digital filters ...
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... WM8741 DIGITAL FILTER SELECTION The WM8741 includes a wide range of digital filters. A limited set of these can be selected in hardware control mode as listed in Table 50. Full details of each digital filter response can be found in section PCM Digital Filter Selection, from page 37. PIN 4 Table 50 FSEL/DINR Hardware Control Pin Function There is no choice of digital filters in DSD Direct mode – ...
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... Production Data OVERVIEW OF FUNCTIONS The WM8741 has many modes of operation, and certain restrictions on what functions are available in which modes. Table 52 gives an overview of the functions available in hardware and software control modes across all modes of operation: FUNCTION NORMAL PCM Selectable Digital Filters De-emphasis Support ...
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... WM8741 REGISTER MAP Reg Name Addr Bit 8 DACLLSB 0 00h 0 Attenuation DACLMSB 1 01h 0 Attenuation DACRLSB 2 02h 0 Attenuation DACRMSB 3 03h 0 Attenuation 4 Volume Control 04h 0 5 Format Control 05h 0 6 Filter Control 06h 0 7 Mode Control 1 07h 0 8 Mode Control 2 08h 0 9 Software Reset ...
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... Store RAT[4:0] and update attenuation on registers 0-3 DEFAULT DESCRIPTION MSBs of attenuation data for right channel in 4dB step. See Table 25 00 (0dB) for details. 0 Attenuation data load control for right channel Store RAT[9:5] value but don’t update 1 = Store RAT[9:5] and update attenuation on registers 0-3 WM8741 PD, Rev 4.1, August 2009 45 ...
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... WM8741 REGISTER BITS NAME ADDRESS R4 0 VOL_RAMP Volume Control 04h 1 ATT2DB 2 ATC 3 SOFTMUTE 4 IZD 6:5 ZEROFLR [1:0] 7 AMUTE Table 57 R4 Volume Control Register w DEFAULT DESCRIPTION Ramps volume from existing attenuation setting to new setting when 0 UPDATE applied. 0: Step volume change 1: Ramp volume change 0 Anti-clipping mode control. Attenuates PCM gain path by 2 dB: ...
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... Response 4 100 = Response 5 Select DSD compensation filter response Response Response Response Response 4 00 De-emphasis mode select De-emphasis Off 01 = De-emphasis 32kHz 10 = De-emphasis 44.1kHz 11 = De-emphasis 48kHz 0 ZFLAG Force High Control 0 = Normal operation 1 = Output Logic 1 WM8741 PD, Rev 4.1, August 2009 47 ...
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... WM8741 REGISTER BITS NAME ADDRESS R7 [1:0] MODESEL Mode Control 1 [1:0] 07h [4:2] SR[3:0] [6:5] OSR[1:0] 7 MODE8X Table 60 R7 Mode Control Register 1 REGISTER BITS NAME ADDRESS R8 [1:0] DITHER[1:0] Mode Control 2 08h w DEFAULT DESCRIPTION 00 DSD/PCM mode select PCM mode 01 = DSD Direct mode 10 = DSD Plus mode 11 = Unused 000 MCLK to LRCLK sampling rate ratio control: ...
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... Software reset. Writing to the register resets the entire chip, including 00000000 the register map. DEFAULT DESCRIPTION 0 DSD Direct 8fs Notch Filter 0: Enable 8fs notch filter 1: Disable 8fs notch filter 1 DSD Direct Filter Gain 0: High Gain 1: Low Gain WM8741 PD, Rev 4.1, August 2009 49 ...
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... WM8741 DIGITAL FILTER CHARACTERISTICS PCM MODE FILTER CHARACTERISTICS PARAMETER TEST CONDITIONS Low Rate (32/44.1/48kHz) PCM Filter Response 1 ± 0.000057dB Passband Passband Ripple Stopband Stopband Attenuation Attenuation at fs/2 Group Delay Low Rate (32/44.1/48kHz) PCM Filter Response 2 ± 0.000036 dB Passband Passband Ripple Stopband Stopband Attenuation ...
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... Table 65 Medium Rate PCM Filter Characteristics w MIN TYP 0.500fs -120.3 -120.41 17 0.500fs -120.8 -127.96 9 0.500fs -115.5 -116.89 48 0.458fs -120.0 -126.82 9 0.458fs -122.5 -130.52 8 WM8741 MAX UNIT 0.208fs 0.000021 0.208fs 0.000014 0.417fs 0.000048 0.208fs 0.000021 dB dB ...
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... WM8741 PARAMETER TEST CONDITIONS High Rate (176.4/192kHz) PCM Filter Response 1 ± 0.000010 dB Passband Passband Ripple Stopband Stopband Attenuation Fs/2 Attenuation at fs/2 Group Delay High Rate (176.4/192kHz) PCM Filter Response 2 ± 0.000031 dB Passband Passband Ripple Stopband Stopband Attenuation Fs/2 Attenuation at fs/2 Group Delay High Rate (176.4/192kHz) PCM Filter Response 3 ± ...
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... Passband Passband Ripple Stopband Stopband Attenuation -3dB point Filter Cut-off Group Delay Table 68 DSD Plus Filter Characteristics w MIN TYP 127.69 -38.51 58.91 71 120.41 -44.52 49.83 127 70.14 -26.28 49.74 46 70.03 -48.05 49.78 127 WM8741 MAX UNIT 22.48 kHz 0.020423 dB kHz dB kHz fs 23.04 kHz 0.011308 dB kHz dB kHz fs 27.35 kHz 0.019762 dB kHz dB kHz Fs 20.24 kHz ...
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... WM8741 PCM MODE FILTER RESPONSES 0 -50 -100 -150 -200 0 0.5 1 1.5 2 Frequency (fs) Figure 28 Low Rate PCM Filter 1 Frequency Response 0 -50 -100 -150 -200 0 0.5 1 1.5 2 Frequency (fs) Figure 30 Low Rate PCM Filter 2 Frequency Response 0 -50 -100 -150 -200 0 0.5 1 1.5 2 Frequency (fs) Figure 32 Low Rate PCM Filter 3 Frequency Response w 0 ...
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... Frequency (fs) Figure 38 Medium Rate PCM Filter 1 Frequency Response w 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 2.5 3 3.5 4 Figure 35 Low Rate PCM Filter 4 Ripple 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 2.5 3 3.5 4 Figure 37 Low Rate PCM Filter 5 Ripple 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 1.5 2 Figure 39 Medium Rate PCM Filter 1 Ripple WM8741 0.1 0.2 0.3 0.4 Frequency (fs) 0.1 0.2 0.3 0.4 Frequency (fs) 0.05 0.1 0.15 0.2 Frequency (fs) PD, Rev 4.1, August 2009 0.5 0.5 0.25 55 ...
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... WM8741 0 -50 -100 -150 -200 0 0.5 1 Frequency (fs) Figure 40 Medium Rate PCM Filter 2 Frequency Response 0 -50 -100 -150 -200 0 0.5 1 Frequency (fs) Figure 42 Medium Rate PCM Filter 3 Frequency Response 0 -50 -100 -150 -200 0 0.5 1 Frequency (fs) Figure 44 Medium Rate PCM Filter 4 Frequency Response w 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0 ...
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... Figure 50 High Rate PCM Filter 2 Frequency Response w 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 1.5 2 Figure 47 Medium Rate PCM Filter 5 Ripple 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 0.6 0.8 1 Figure 49 High Rate PCM Filter 1 Ripple 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 0.6 0.8 1 Figure 51 High Rate PCM Filter 2 Ripple WM8741 0.05 0.1 0.15 0.2 Frequency (fs) 0.025 0.05 0.075 0.1 0.125 Frequency (fs) 0.025 0.05 0.075 0.1 0.125 Frequency (fs) PD, Rev 4.1, August 2009 0.25 0.15 0.15 57 ...
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... WM8741 0 -50 -100 -150 -200 0 0.2 0.4 Frequency (fs) Figure 52 High Rate PCM Filter 3 Frequency Response 0 -50 -100 -150 -200 0 0.2 0.4 Frequency (fs) Figure 54 High Rate PCM Filter 4 Frequency Response 0 -50 -100 -150 -200 0 0.2 0.4 Frequency (fs) Figure 56 High Rate PCM Filter 5 Frequency Response w 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0 0.6 0.8 1 Figure 53 High Rate PCM Filter 3 Ripple ...
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... Figure 59 8FS Mode Filter Ripple -10 -15 0 150 200 Figure 61 DSD Plus Mode Filter 1 Ripple -10 -15 0 150 200 Figure 63 DSD Plus Mode Filter 2 Ripple WM8741 0.1 0.2 0.3 0.4 Frequency (fs Frequency (kHz Frequency (kHz) PD, Rev 4.1, August 2009 0 ...
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... WM8741 0 -20 -40 -60 -80 -100 0 50 100 Frequency (kHz) Figure 64 DSD Plus Mode Filter 3 Frequency Response 0 -20 -40 -60 -80 -100 0 50 100 Frequency (kHz) Figure 66 DSD Plus Mode Filter 4 Frequency Response DSD DIRECT MODE FILTER RESPONSES 0 -20 -40 -60 -80 -100 0 50 100 150 200 ...
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... Figure 73 DSD Direct Mode 8fs Notch Low Gain Filter Ripple (Normalised -10 -15 -20 0 250 300 350 400 Figure 75 DSD Direct Mode 8fs Notch High Gain Filter Ripple (Normalised) WM8741 Frequency (kHz Frequency (kHz Frequency (kHz) PD, Rev 4.1, August 2009 25 ...
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... WM8741 DEEMPHASIS FILTER RESPONSES 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 0 5000 10000 Frequency (Hz) Figure 76 De-emphasis frequency response (32kHz) 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 0 5000 10000 Frequency (Hz) Figure 78 De-emphasis frequency response (44.1kHz) 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 0 5000 10000 Frequency (Hz) Figure 80 De-emphasis frequency response (48kHz) w 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 15000 20000 0 Figure 77 De-emphasis error (32kHz) 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 15000 20000 0 Figure 79 De-emphasis error (44.1kHz) 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 15000 ...
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... Production Data APPLICATIONS INFORMATION Figure 82 External Components Figure 83 External Filter Components w WM8741 PD, Rev 4.1, August 2009 63 ...
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... WM8741 PACKAGE DIMENSIONS DS: 28 PIN SSOP (10.2 x 5.3 x 1.75 mm Dimensions Symbols (mm) MIN NOM ----- A 0. 1.65 1. 0.22 b 0.09 c 9.90 10.20 D 0.65 BSC e 7.40 7.80 E 5.00 5. 0.55 0.75 L 1.25 REF θ 0 JEDEC.95, MO-150 REF: NOTES: A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS. B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.20MM. ...
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... Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w WM8741 Wolfson is PD, Rev 4.1, August 2009 65 ...