w WM8716 High Performance 24-bit, 192kHz Stereo DAC DESCRIPTION FEATURES The WM8716 is a high performance stereo DAC designed for audio applications such as CD, DVD, home theatre systems, set top boxes and digital TV. The WM8716 supports data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8716 consists of a serial interface port, digital interpolation filter, multi-bit sigma delta modulator and stereo DAC in a small 28-lead SSOP package. The WM8716 also includes a digitally controllable mute and attenuator function on each channel. • 112dB SNR (‘A’ weighted @ 48kHz), THD: -97dB @ -1dB FS • • • Sampling frequency: 8kHz to 192kHz Selectable digital filter roll-off Optional interface to industry standard external filters • • • Differential mono mode Input data word: 16 to 24-bit Hardware or SPI compatible serial port control modes: The internal digital filter has two selectable roll-off characteristics. A sharp or slow roll-off can be selected dependent on application requirements. Additionally, the internal digital filter can be by-passed and the WM8716 used with an external digital filter. The WM8716 supports two connection schemes for audio DAC control. The SPI-compatible serial control port provides access to a wide range of features including onchip mute, attenuation and phase reversal. A hardware controllable interface is also available. − • Hardware mode: mute, de-emphasis, audio format control − Serial mode: mute, de-emphasis, attenuation (256 steps), phase reversal Compatible upgrade to PCM1716 APPLICATIONS • • • CD, DVD audio Home theatre systems Set top boxes • Digital TV BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, August 2008, Rev 4.2 ©2008 Wolfson Microelectronics plc WM8716 Production Data TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 ABSOLUTE MAXIMUM RATINGS.........................................................................4 RECOMMENDED OPERATING CONDITIONS .....................................................4 ELECTRICAL CHARACTERISTICS ......................................................................5 TERMINOLOGY ............................................................................................................ 6 PIN DESCRIPTION ................................................................................................8 DEVICE DESCRIPTION.........................................................................................9 SYSTEM CLOCK .......................................................................................................... 9 AUDIO DATA INTERFACE ..................................................................................10 NORMAL SAMPLE RATE ........................................................................................... 10 8 X FS INPUT SAMPLE RATE .................................................................................... 11 MODES OF OPERATION ........................................................................................... 12 HARDWARE CONTROL MODES ............................................................................... 12 SOFTWARE CONTROL INTERFACE......................................................................... 13 REGISTER MAP ......................................................................................................... 13 MUTE MODES ............................................................................................................ 18 FILTER RESPONSES ................................................................................................. 19 APPLICATIONS INFORMATION .........................................................................22 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 22 RECOMMENDED EXTERNAL COMPONENTS VALUES ........................................... 22 PACKAGE DIMENSIONS ....................................................................................25 IMPORTANT NOTICE ..........................................................................................26 ADDRESS: .................................................................................................................. 26 w PD, Rev 4.2,August 2008 2 WM8716 Production Data PIN CONFIGURATION LRCIN 1 28 ML/I2S DIN 2 27 MC/DM1 BCKIN 3 26 MD/DM0 CLKO 4 25 MUTEB XTI 5 24 MODE XTO 6 23 CSBIWO DGND 7 22 RSTB DVDD 8 21 ZERO AVDDR 9 20 AVDDL AGNDR 10 19 AGNDL VMIDR 11 18 VMIDL DIFFHW MODE8X 12 17 VOUTR 13 16 VOUTL 15 AVDD AGND 14 ORDERING INFORMATION DEVICE TEMPERATURE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE WM8716SEDS/V -25 to +85°C 28-lead SSOP (Pb- free) MSL2 260°C WM8716SEDS/RV -25 to +85°C 28-lead SSOP (Pb- free, tape and reel) MSL2 260°C Note: Reel quantity = 2,000 w PD, Rev 4.2, August 2008 3 WM8716 Production Data ABSOLUTE MAXIMUM RATINGS 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. Wolfson 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 <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag. MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag. MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag. CONDITION MIN MAX Supply voltage -0.3V +7.0V Reference input VDD + 0.3V -25°C Operating temperature range, TA Storage temperature Voltage range digital inputs +85°C -65°C +150°C DGND -0.3V DVDD +0.3V Master clock frequency 37MHz RECOMMENDED OPERATING CONDITIONS PARAMETER MIN TYP MAX Digital supply range DVDD -10% 3.3 to 5 +10% V Analogue supply range AVDD -10% 3.3 to 5 +10% V 0 +0.3 V mA Ground SYMBOL TEST CONDITIONS AGND, DGND Difference DGND to AGND 0 -0.3 UNIT V Analogue supply current AVDD = 5V 26 40 Digital supply current DVDD = 5V 22 35 Analogue supply current AVDD = 3.3V 25 mA Digital supply current DVDD = 3.3V 13 mA w mA PD, Rev 4.2,August 2008 4 WM8716 Production Data ELECTRICAL CHARACTERISTICS TEST CONDITIONS o AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25 C, fs = 48kHz, SCKI = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP 105 MAX UNIT DAC Circuit Specifications SNR (See Notes 1 and 2) 112 dB THD (full-scale) 0dB FS -92 dB (See Note 2) -1dB FS -97 dB 112 dB Dynamic range (See Note 2) THD @ -60dB FS 105 Passband ±0.0012 dB 0.4535fs Stopband -3dB Filter Characteristics (Sharp Roll-off) dB 0.491fs ±0.0012 Passband ripple Stopband Attenuation f > 0.5465fs -82 Delay time dB 30/fs Filter Characteristics (Slow Roll-off) Passband Stopband ±0.001dB 0.274fs -3dB 0.459fs f > 0.732fs -82 s ±0.001 Passband ripple Stopband Attenuation Delay time dB dB dB 9/fs s -3dB 195 kHz 20kHz -0.043 dB Internal Analogue Filter Bandwidth Passband edge response Digital Logic Levels Input LOW level VIL Input HIGH level (See Note 3) VIH 0.8 2.0 Output LOW level VOL IOL = 2mA Output HIGH level VOH IOH = 2mA V DGND + 0.3V V DVDD - 0.3V Analogue Output Levels Output level Minimum resistance load Maximum capacitance load Into 10kΩ, full scale 0dB, (5V supply) Into 10kΩ, full scale 0dB, (3.3V supply) To midrail or AC coupled (5V supply) To midrail or AC coupled (3.3V supply) 5V or 3.3V Output DC level VRMS 1.1 0.72 VRMS 1 kΩ 600 Ω 100 pF AVDD/2 Gain mismatch channel to channel 0.5 V 2 %FSR Reference Levels Potential divider resistance Voltage at VMIDL/VMIDR AVDD to VMIDL/VMIDR and VMIDL/VMIDR to AGND 10 kΩ AVSS/2 POR POR threshold w 2.5V V PD, Rev 4.2, August 2008 5 WM8716 Production Data Notes: 1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’ weighted over a 20Hz to 20kHz bandwidth. 2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values. 3. Except for Pin 12 (MODE8X) and Pin 17 (DIFFHW), where VIH = 2.6V min. TERMINOLOGY 1. Signal-to-noise ratio (dB) (SNR) is a measure of the difference in level between the full-scale output and the output with no signal applied. 2. Dynamic range (dB) (DNR) is a measure of the difference between the highest and lowest portions of a signal. Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (eg THD+N @ -60dB= -32dB, DR= 92dB). 3. THD+N (dB) is a ratio of the r.m.s. values, of (Noise + Distortion)/Signal. 4. Stop band attenuation (dB) is the degree to which the frequency spectrum is attenuated (outside audio band). 5. Channel Separation (dB) (also known as Cross-Talk) is a measure of the amount one channel is isolated from the other. Normally measured by sending a full-scale signal down one channel and measuring the other. 6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region. LRCIN tBCH tBCL tLB BCKIN tBCY tBL DIN tDS tDH Figure 1 Audio Data Input Timing TEST CONDITIONS AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Audio Data Input Timing Information BCKIN pulse cycle time tBCY 100 ns BCKIN pulse width high tBCH 50 ns BCKIN pulse width low tBCL 50 ns BCKIN rising edge to LRCIN edge tBL 30 ns LRCIN rising edge to BCKIN rising edge tLB 30 ns DIN setup time tDS 30 ns DIN hold time tDH 30 ns w PD, Rev 4.2,August 2008 6 WM8716 Production Data tSCKIL SCKI tSCKIH Figure 2 System Clock Timing Requirements TEST CONDITIONS AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT System Clock Timing Information SCKI System clock pulse width high tSCKIH 13 ns SCKI System clock pulse width low tSCKIL 13 ns tMLL ML/I2S (PIN 28) tMCY tMCH tMCL tMHH tMLH tMLS MC/DM1 (PIN 27) tMDS tMDH MD/DM0 (PIN 26) LSB tCSML tMLCS CSBIWO (PIN 23) Figure 3 Program Register Input Timing TEST CONDITIONS AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Program Register Input Information MC/DM1 Pulse cycle time tMCY 100 ns MC/DM1 Pulse width LOW tMCL 40 ns MC/DM1 Pulse width HIGH tMCH 40 ns MD/DM0 Hold time tMDH 40 ns MD/DM0 Set-up time tMDS 40 ns ML/I2S Low level time (See Note 3) tMLL 40 + 1SYSCLK ns ML/I2S High level time (See Note 3) tMHH 40 + 1SYSCLK ns ML/I2S Hold time tMLH 40 ns ML/I2S Set-up time tMLS 40 ns CSBIWO Low to ML/I2S low time tCSML 10 ns ML/I2S High to CSBIWO high time tMLCS 10 ns Note: 3. System clock cycle. w PD, Rev 4.2, August 2008 7 WM8716 Production Data PIN DESCRIPTION PIN NAME TYPE DESCRIPTION Hardware Mode Normal Mode Differential Mode 1 LRCIN Digital input Sample rate clock input. 2 DIN Digital input Audio data serial input 3 BCKIN Digital input Audio data bit clock input. 4 CLKO Digital output Oscillator buffered output (system clock). Software Mode 8X Mode DINL Audio data serial input 5 XTI Analogue input Oscillator input. 6 XTO Analogue output Oscillator output. 7 DGND Supply Digital ground supply. 8 DVDD Supply Digital positive supply. 9 AVDDR Supply Analogue positive supply. 10 AGNDR Supply Analogue ground supply. 11 VMIDR Analogue output 12 MODE8X Digital input 13 VOUTR Analogue output 14 AGND Supply Analogue ground supply. 15 AVDD Supply Analogue positive supply. 16 VOUTL Analogue output Left channel DAC output. 17 DIFFHW Digital input 18 VMIDL Analogue output 19 AGNDL Supply Analogue ground supply. 20 AVDDL Supply Analogue positive supply. 21 ZERO Digital output Infinite zero detect – active low. Open drain type output with active pull-down. 22 RSTB Digital input Reset input – active low. Internal pull-up. 23 CSBIWO Digital input Internal pull-down 24 MODE 25 Mid rail right channel. Internal pull-down, active high, 8 x fs mode. Right channel DAC output. Internal pull-down, active high, differential mono mode Mid rail left channel. Wordlength: Low for 16-bit data. High for 20-bit (normal) or 24-bit I2S data. Wordlength: Low for 16-bit data. High for 20-bit (normal) or 24-bit I2S data. Wordlength: Low for 20-bit data. High for 24-bit data. Low for serial interface operation. Digital input Internal pull-up Low for hardware mode. Low for left mono mode. High for right mono mode DINR High for software mode. MUTEB Digital input Internal pull-up Low to soft mute. High for normal operation. Z for automute. Low to soft mute. High for normal operation. Z for automute. Low to soft mute. High for normal operation. Z for automute. Low to soft mute. High for normal operation. Z for automute. 26 MD/DM0 Digital input Internal pull-up De-emphasis mode select bit 0. Low for no de-emphasis. High for 44.1kHz de-emphasis. LRP – LRCLK polarity select. Control serial interface data signal. 27 MC/DM1 Digital input Internal pull-up De-emphasis mode select bit 1. Low for normal filter operation. High for filter slow roll-off. Unused. Leave unconnected. Control serial interface clock signal. 28 ML/I2S Digital input Internal pull-up Audio serial format: Low – right justified. High – I2S. Audio serial format: Low – right justified. High – I2S. Input data format: Low – right justified. High – left justified. Control serial interface load signal. Note: Digital input pins have Schmitt trigger input buffers except Pin 12 and Pin 17. w PD, Rev 4.2,August 2008 8 WM8716 Production Data DEVICE DESCRIPTION The WM8716 is a high performance 128fs oversampling rate stereo DAC employing a novel 64 level sigma delta DAC design which provides optimised signal-to-noise performance and clock jitter tolerance. It is ideally suited to high quality audio applications such as CD, DVD-audio, home theatre receivers and professional mixing consoles. The WM8716 supports sample rates from 8ks/s to 192ks/s. The control functions of the WM8716 are either pin selected (hardware mode) or programmed via the serial interface (software mode). Control functions that are available include: data input word length and format selection (16-24 bits: I2S, left justified or right justified): de-emphasis sample rate selection (48kHz, 44.1kHz and 32kHz); differential output modes; a software or hardware mute and independently digitally controllable attenuation on both channels. The digital filtering may be bypassed entirely by selecting MODE8X. Data is then input directly to the DAC, bypassing the digital filters. Left and right channels are input separately, using the MODE pin as the right channel input. This mode allows the use of alternative digital filters, such as the Pacific Microsonics PMD100 HDCD filter. In addition to the normal stereo operating mode the WM8716 may also be used in dual differential mode with either the left or right channel (selectable) being output differentially. Two WM8716s can then be used in parallel to implement a stereo channel, each supporting a single channel differentially. This mode is available in both software and hardware modes and may also be used in conjunction with MODE8X. SYSTEM CLOCK Sample rates from 8ks/s up to 96ks/s are available, and automatically selected, with a system clock of 256fs, 384fs, 512fs or 768fs. In addition a system clock of 128fs or 192fs may be used, with sample rates up to 192ks/s. With a 128fs or 192fs system clock 64x oversampling mode operation is automatically selected and the first stage of the digital filter is bypassed. WM8716 has an asynchronous monitor circuit, which in the event of removal of the master system clock, resets the digital filters and analogue circuits, muting the output. Re-application of the system clock re-starts the filters from an intitialised state. Control registers are not reset under this condition. The WM8716 is tolerant of asynchronous bit clock jitter. The internal signal processing resynchronises to the external LRCIN once the phase difference between bit clock and the system clock exceeds half an LRCIN period. During this re-synch period the interpolating filters will either miss or repeat an audio sample, minimising the audible effects of the operation. Table 1 shows the typical system clock frequency inputs for the WM8716. SAMPLING RATE (LRCIN) 32kHz 44.1kHz 48kHz 96kHz 192kHz SYSTEM CLOCK FREQUENCY (MHZ) 128fs 192fs 256fs 384fs 512fs 768fs 4.096 5.6448 6.114 12.288 24.576 6.144 8.467 9.216 18.432 36.864 8.192 11.2896 12.288 24.576 Unavailable 12.288 16.9340 18.432 36.864 Unavailable 16.384 22.5792 24.576 Unavailable Unavailable 24.576 33.8688 36.864 Unavailable Unavailable Table 1 System Clock Frequencies Versus Sampling Rate w PD, Rev 4.2, August 2008 9 WM8716 Production Data AUDIO DATA INTERFACE Data may be input at a rate corresponding to the system clock having a rate of 256fs or 384fs or 512fs or 768fs, in which case an oversampling ratio of 128x is selected. Alternatively a rate of 128fs or 192fs may be used, in which case the first filter stage is bypassed and an oversampling ratio of 64x results. Finally, in MODE8X, data may be input at 8x the normal rate, in which case separate input pins are used to input the two stereo channels of data (unless DIFFHW mode and MODE8X are both selected, in which case only a mono channel is converted differentially). In MODE8X all filter stages are by-passed, prior to the sigma delta modulator. Data is input MSB first in all modes. NORMAL SAMPLE RATE In normal mode, the data is input serially on one pin for both left and right channels. Data can be “right justified” meaning that the last 16, 20 or 24 bits (depending on chosen PCM word length) that were clocked in prior to the transition on LRCIN are valid. Alternatively data can be “left justified” (20 and 24-bit PCM data only), where the bits are clocked in as the first 20 or 24 bits after a transition on LRCIN. For the three I2S modes supported (16-bit, 20-bit and 24-bit PCM data), data is clocked “left justified” except with one additional preceding clock cycle. 1/fs LEFT RIGHT LRCIN (PIN 1) BCKIN (PIN 3) 16-BIT RIGHT JUSTIFIED DIN (PIN 2) B2 B1 B0 20-BIT RIGHT JUSTIFIED DIN (PIN 2) B2 B1 24-BIT RIGHT JUSTIFIED DIN (PIN 2) B2 B1 B15 B2 B1 B0 B15 B2 B1 B0 B0 B19 B18 B17 B2 B1 B0 B19 B18 B17 B2 B1 B0 B0 B23 B22 B21 B20 B19 B2 B1 B0 B23 B22 B21 B20 B19 B2 B1 B0 24-BIT LEFT JUSTIFIED DIN (PIN 2) B0 B23 B22 B21 B4 20-BIT LEFT JUSTIFIED DIN (PIN 2) B0 B19 B18 B17 B0 B3 B2 B1 B0 B23 B22 B21 B4 B19 B18 B17 B0 LEFT B3 B2 B1 B0 RIGHT LRCIN (PIN 1) BCKIN (PIN 3) 16-BIT I2S DIN (PIN 2) B15 B2 B1 B0 24-BIT I2S DIN (PIN 2) B23 B6 B5 B4 B3 20-BIT I2S DIN (PIN 2) B19 B2 B1 B0 B2 B1 B0 B15 B2 B1 B0 B23 B6 B5 B4 B3 B19 B2 B1 B0 B15 B2 B1 B0 B23 B19 Figure 4 Audio Data Input Format w PD, Rev 4.2,August 2008 10 WM8716 Production Data 8 X FS INPUT SAMPLE RATE Due to the higher speed of the interface in 8 x fs mode, audio data is input on two pins. The MODE pin (pin 24) is used as the second input for the right channel data and left data is input on DIN (pin 2). In this mode, software control of the device is not available. The data can be input in two formats, left or right justified, selectable by ML/I2S and two word lengths (20 or 24 bit), selectable by CSBIWO. In both modes the data is always clocked in MSB first. For left justified data the word start is marked by the falling edge of LRCIN. The data is clocked in on the next 20/24 BCKIN rising edges. This format is compatible with devices such as the PMD100. For right justified the data is justified to the rising edge of LRCIN and the data is clocked in on the preceding 20/24 BCKIN rising edges before the LRCIN rising edge. This format is compatible with devices such as the DF1704 or SM5842. In both modes the polarity of LRCIN can be switched using MD/DM0. Differential hardware mode can be used in conjunction with 8fs mode by setting the DIFFHW pin high. In differential 8fs mode the data is input on DIN and output differentially. MODE is unused and must be tied low. 1/8fs LRCIN (PIN 1) BCKIN (PIN 3) LEFT AUDIO DATA DIN (PIN 2) B23 B22 B21 B20 B19 B2 B1 B0 B23 B22 B21 B20 RIGHT AUDIO DATA MODE (PIN 24) B23 B22 B21 B20 B19 B2 B1 B0 B23 B22 B21 B20 1/8fs LRCIN (PIN 1) BCKIN (PIN 3) LEFT AUDIO DATA DIN (PIN 2) B23 B22 B21 B20 B19 B2 B1 B0 RIGHT AUDIO DATA MODE (PIN 24) B23 B22 B21 B20 B19 B2 B1 B0 Figure 5 Audio Data Input Format (8 x fs Operation) w PD, Rev 4.2, August 2008 11 WM8716 Production Data MODES OF OPERATION Control of the various modes of operation is either by software control over the serial interface, or by hard-wired pin control. Selection of software or hardware mode is via MODE pin. The following functions may be controlled either via the serial control interface or by hard wiring of the appropriate pins. HARDWARE CONTROL MODES When the MODE pin is held ‘low’ the following hardware modes of operation are available. In Hardware differential mode or 8X mode some of these modes/control words are altered or unavailable. DE-EMPHASIS CONTROL MDDM1 PIN 27 MCDMO PIN 26 DE-EMPHASIS L L H H L H L H Off 48kHz 44.1kHz 32kHz CSBIIS PIN 28 CSBIWO PIN 23 DATA FORMAT L L H H L H L H 16 bit normal right justified 20 bit normal right justified 16 bit I2S 24 bit I2S Table 2 De-Emphasis Control AUDIO INPUT FORMAT Table 3 Audio Input Format SOFT MUTE MUTEB PIN 25 FUNCTION L Z H Mute On (no output) Automute Mute Off (normal operation) Table 4 Soft Mute A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of 128/fs seconds per 0.5dB step. Setting MUTEB high will cause the attenuation to ramp back to its previous value. Leaving MUTEB undriven allows operation of the automute circuit in both hardware and software modes. On receiving 1024 consecutive zero value audio samples, the analogue stage output mute is asserted. This may be overdriven from the MUTEB pin to disable the automute function, or output as a weak (10kohm) output signal. w PD, Rev 4.2,August 2008 12 WM8716 Production Data SOFTWARE CONTROL INTERFACE The WM8716 can be controlled using a 3-wire serial interface. MD/DM0 (pin 26) is used for the program data, MC/DM1 (pin 22) is used to clock in the program data and ML/I2S (pin 28) is use to latch in the program data. The 3-wire interface protocol is shown in Figure 6. CSB/IWO (pin 23) must be low when writing. ML/I2S (PIN 28) MC/DM1 (PIN 27) B15 MD/DM0 (PIN 26) B14 B13 B2 B1 B0 Figure 6 Three-Wire Serial Interface REGISTER MAP WM8716 controls the special functions using 4 program registers, which are 16-bits long. These registers are all loaded through input pin MD/DM0. After the 16 data bits are clocked in, ML/I2S is used to latch in the data to the appropriate register. Table 5 shows the complete mapping of the 4 registers. Note that in hardware differential mode and 8X modes, software control is not available. The hardware differential mode (Diff[1:0]) clock loss detector disable (CDD) can only be accessed by writing to M2[8:5] with the pattern 1111. Register M4 is then accessible by setting A[2:0] to 110. B15 B14 B13 B12 M0 - - - - M1 - - - M2 - - M3 - - M4 - - B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 A2 (0) A1(0) A0(0) LDL AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0 - A2(0) A1(0) A0(1) LDR AR7 AR6 AR5 AR4 AR3 AR2 AR1 AR0 - - A2(0) A1(1) A0(0) - - - - IW1 IW0 OPE DEM MUT - - A2(0) A1(1) A0(1) IZD SF1 SF0 CK0 REV SR0 ATC LRP I 2S - - A2(1) A1(1) A0(0) - - - - - - CDD DIFF1 DIFF0 Table 5 Mapping of Program Registers w PD, Rev 4.2, August 2008 13 WM8716 Production Data REGISTER BITS NAME DEFAULT 0 [7:0] AL[7:0] FF 8 LDL 0 [7:0] AR[7:0] FF 8 LDR 0 Attenuation data load control for right channel. 0 MUT 0 Left and right DACs soft mute control. 1 DEM 0 De-emphasis control. 2 OPE 0 Left and right DACs operation control. [4:3] IW[1:0] 0 Input audio data bit select. 1 2 3 4 DESCRIPTION Attenuation data for left channel. Attenuation data load control for left channel. Attenuation data for right channel. 0 I2S 0 Audio data format select. 1 LRP 0 Polarity of LRCIN select. 2 ATC 0 Attenuator control. 3 SR0 0 Digital filter slow roll-off select. 4 REV 0 Output phase reverse. 5 CKO 0 CLKO frequency select. [7:6] SF[1:0] 0 Sampling rate select. 8 IZD 0 Infinite zero detection circuit control. [5:4] DIFF 0 Differential output mode. 6 CDD 0 Clock loss detector disable. Table 6 Register Bit Descriptions DAC OUTPUT ATTENUATION The level of attenuation for eight bit code X, is given by: 0.5 ∗ (X - 255) dB, 1 ≤ X ≤ 255 - ∞dB (mute), X=0 Bit 8 in register 0 (LDL) is used to control the loading of attenuation data in B[7:0]. When LDL is set to 0, attenuation data will be loaded into AL[7:0], but it will not affect the filter attenuation. LDR in register 1 has the same function for right channel attenuation. Only when LDL or LDR is set to '1' will the filter attenuation be updated. This permits left and right channel attenuation to be updated simultaneously. Attenuation level is controlled by AL[7:0] (left channel) or AR[7:0] (right channel). Attenuation levels are given in Table 4. X[7:0] ATTENUATION LEVEL 00(hex) 01(hex) : : FD(hex) FE(hex) FF(hex) - ∞dB (mute) -127.0dB : : -1.0dB -0.5dB 0.0dB Table 7 Attenuation Control Level Bit 2 in Reg3 is used to control the attenuator (ATC). When ATC is “high”, the attenuation data loaded in program register 0 is used for both the left and the right channels. When ATC is low, the attenuation data for each register is applied separately to left and right channels. w PD, Rev 4.2,August 2008 14 WM8716 Production Data SOFT MUTE MUT (REG2, B0) L Soft Mute off (normal operation) H Soft Mute on (no output) Table 8 Soft Mute Setting MUT causes the attenuation to ramp from the current value down to 00. The values held in the attenuation registers are unchanged. When MUT is reset the attenuation will ramp back up to the previous value. The ramp rate is 128/fs s/0.5dB step. DIGITAL DE-EMPHASIS DEM (REG2, B1) L De-emphasis off H De-emphasis on Table 9 Digital De-Emphasis DAC OPERATION ENABLE OPE (REG2,B2) L Normal operation H DAC output forced to bipolar zero, irrespective of input data. Table 10 DAC Operation Enable AUDIO DATA INPUT FORMAT I2S (REG3, B0) IW1 (REG2, B4) IW0 (REG2, B3) AUDIO INTERFACE 0 0 0 16-bit standard right justified 0 0 1 20-bit standard right justified 0 1 0 24-bit standard right justified 0 1 1 24-bit left justified (MSB first) 1 0 0 16-bit I2S 1 0 1 24-bit I S 1 1 0 20-bit I2S 1 1 1 20-bit left justified (MSB first) 2 Table 11 Audio Data Input Format POLARITY OF LR INPUT CLOCK The left channel data for a particular sample instant is always input first, then the right channel data. LRP (REG3, B1) L LR High – left channel LR Low – right channel H LR Low – left channel LR High – right channel Table 12 Polarity of LR Input Clock w PD, Rev 4.2, August 2008 15 WM8716 Production Data INDIVIDUAL OR COMMON ATTENUTATION CONTROL ATC (REG3, B2) L Individual control H Common control from Reg0 Table 13 Individual or Common Attenuation Control DIGITAL FILTER ROLL-OFF SELECTION SRO (REG3, B3) L Sharp H Slow Table 14 Digital Filter Roll-Off Selection ANALOGUE OUTPUT POLARITY REVERSAL REV (REG3, B4) L Normal H Inverted Table 15 Analogue Output Polarity Reversal CLKO OUTPUT FREQUENCY CKO (REG3, B5) L XTI H XTI/2 Table 16 CLKO Output Frequency DE-EMPHASIS SAMPLE RATE SF1 (REG3, B7) SF0 (REG3, B6) SAMPLE RATE 0 0 1 1 0 1 0 1 No de-emphasis 48kHz 44.1kHz 32kHz Table 17 De-Emphasis Sample Rate INFINITE ZERO DETECT IZD (REG3, B8) L Zero detect mute off H Zero detect mute on Table 18 Infinite Zero Detect w PD, Rev 4.2,August 2008 16 WM8716 Production Data DIFFERENTIAL MONO MODE Using bits 4 and 5, the differential output mode may be selected to be one of normal stereo, reversed stereo, mono left or mono right, as shown in Table 19. DIFF[1:0] B[4:5]) DIFFERENTIAL OUTPUT MODE 00 Stereo 01 Stereo reverse. 10 Mono left – differential outputs. VOUTL is left channel. VOUTR is the negative of left channel. 11 Mono right – differential outputs. VOUTL is the negative right channel. VOUTR is right channel. Table 19 Differential Output Modes Using these controls a pair of WM8716 devices may be used to build a ‘dual differential’ stereo implementation with higher performance and differential output. CLOCK LOSS DETECTOR DISABLE CDD (REG4, B6) L Clock loss detector on R Clock loss detector off Table 20 Clock Loss Detector Disable When the system clock is inactive for approximately 100µs, the clock loss detector circuit detects the loss of clock and the analogue circuitry is forced into a mute condition and the digital filters reset. Setting the CDD bit disables this behaviour. w PD, Rev 4.2, August 2008 17 WM8716 Production Data MUTE MODES The device has various mute modes. ANALOGUE DIGITAL FILTER ANRES ANMUTE Reg bit OPE = ‘1’ Unaffected Asserted MUTEB pin Gain ramped to zero On release volume ramps to previous value Asserted when gain = 0 AUTOMUTE (detect 1024 zero input samples) Automute has no effect on digital filters Asserted after 1024 zero input samples if IZD = 1 Reg bit MUT As MUTEB pin As MUTEB pin Gain = 00 (left & right) Gain = -∞dB Asserted RAM initialise Gain initialised to 0dB Loss of system clock Not running (no clock). On clock restart, filters initialised, RAM initialised. Registers unchanged Asserted Asserted No LRCLK or invalid SCLK/LRCLK ratio Filters initialised, RAM initialised. Registers unchanged Asserted Asserted RB Reset – gain initialised to 0dB Asserted Asserted Power-on reset Reset Asserted Asserted Asserted Table 21 Mute Modes • ANRES is the reset to the switched capacitor filter. • ANMUTE is an analogue muting signal gating the analogue signal at the output (after the SC filter) • AUTOMUTE is asserted when both the IZD register bit is asserted and the input audio data has been zero on both left and right channels for 1024 input samples. The first non-zero sample deasserts. • Applying a logic low to MUTEB or setting MUT in Reg2 causes the gain registers to ramp to zero. When a logic high is applied, the gain ramps slowly back up to the value held in the appropriate attenuation register (AL or AR). The ramp rate = 128/fs s/0.5dB step. If SOFTMUTE is set or MUTEB=0 then GAINL and GAINR are overridden to 00 GAINL[0:7] SOFTMUTE Signal Processing GAINR[0:7] MUTEB gain ramps between previous and new gain setting Automute: Detect 1024 zero input samples IZD OPE FREQ_INVALID INIT ANMUTE ZERO Figure 7 Mute Modes w PD, Rev 4.2,August 2008 18 WM8716 Production Data FILTER RESPONSES Figure 8 Digital Filter Response (Sharp Roll-off Mode) Figure 9 Digital Filter Response (Sharp Roll-off Mode) Figure 10 Digital Filter Response (Slow Roll-off Mode) Figure 11 Digital Filter Response (Slow Roll-off Mode) 0 Response (dB) -20 -40 -60 -80 -100 -120 0 0.2 0.4 0.6 0.8 1 1.2 Frequency (Fs) 1.4 1.6 1.8 2 Figure 12 Digital Filter Response 128fs Mode (192kHz Sample Rate) Normal Mode – Solid, Slow Mode – Dashed w PD, Rev 4.2, August 2008 19 Production Data 1 1 0.8 0.8 Impulse Response Impulse Response WM8716 0.6 0.4 0.2 0 -0.2 0.6 0.4 0.2 0 -0.2 -0.4 -0.4 0 10 20 30 40 Time (input samples) 50 60 0 0.0 -1.0 -2.0 -2.0 -3.0 -3.0 Response (dB) Response (dB) 0.0 -1.0 -4.0 -5.0 -6.0 60 -5.0 -6.0 -7.0 -8.0 -8.0 -9.0 -9.0 -10.0 -10.0 6000 50 -4.0 -7.0 4000 30 40 Time (input samples) no De-emphasis) no De-emphasis) 2000 20 Figure 14 Impulse Response (Slow Roll-off, Figure 13 Impulse Response (Normal Roll-off, 0 10 8000 10000 12000 14000 16000 0 5000 10000 Frequency (Fs) 15000 20000 Frequency (Fs) Figure 15 De-emphasis frequency response (fs=32kHz) Figure 15 De-emphasis frequency response (fs=44.1kHz) 0.0 0.4 -1.0 0.3 -2.0 0.2 Response (dB) Response (dB) -3.0 -4.0 -5.0 -6.0 0.1 0.0 -0.1 -7.0 -0.2 -8.0 -0.3 -9.0 -10.0 -0.4 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 0 Frequency (Fs) Figure 16 De-emphasis frequency response (fs=48kHz) 2000 4000 6000 8000 10000 12000 14000 16000 Frequency (Fs) Figure 17 De-emphasis frequency response error (fs=32kHz) w PD, Rev 4.2,August 2008 20 WM8716 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 Response (dB) Response (dB) Production Data 0.0 -0.1 0.0 -0.1 -0.2 -0.2 -0.3 -0.3 -0.4 -0.4 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 Frequency (Fs) Figure 18 De-emphasis frequency response error (fs=44.1kHz) w 20000 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Frequency (Fs) Figure 19 De-emphasis frequency response error (fs=48kHz) PD, Rev 4.2, August 2008 21 WM8716 Production Data APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS DVDD AVDD 8 DVDD + C1 AVDD C2 AVDDR 7 DGND AVDDL DGND AGND AGNDR AGNDL 28 27 Software I/F or Hardware Control 26 23 22 9 20 + 14 C3 C5 C6 10 AGND 19 ML/I2S MC/DM1 MD/DM0 CSB/IWO VOUTR RSTB VOUTL AC-Coupled Output to External LPF C8 16 + MODE8X C7 13 WM8716 17 C4 + 12 15 AVDD DIFFHW R1 24 25 MODE ZERO MUTEB VMIDR VMIDL 1 2 Audio Serial Data I/F 3 5 System Clock Input or Oscillator Input/Output NOTES: 6 21 11 18 + + C11 C9 LRCIN C12 C10 DIN BCKIN XTI AGND CLKO 4 XTI Buffered Output XTO 1. AGND and DGND should be connected as close to the WM8716 as possible. 2. C2 to C5, C9 and C11 should be positioned as close to the WM8716 as possible. 3. Capacitor type used can have a big effect on device performance. It is recommended that capacitors with very low ESR are used and that ceramics are either NPO or COG type material to achieve best performance from the WM8716. Figure 20 External Components Diagram RECOMMENDED EXTERNAL COMPONENTS VALUES COMPONENT REFERENCE SUGGESTED VALUE C1 and C6 10µF De-coupling for DVDD and AVDD. C2 to C5 0.1µF De-coupling for DVDD and AVDD. C7 and C8 10µF Output AC coupling caps to remove VMID DC level from outputs. 0.1µF 10µF 10kΩ Reference de-coupling capacitors for VMIDR and VMIDL. C9 and C11 C10 and C12 R1 DESCRIPTION Resistor to AVDD for open drain output operation. Table 22 External Components Description w PD, Rev 4.2,August 2008 22 WM8716 Production Data DVDD RIGHT DAC 8 + DVDD AVDD AVDDR 7 1 LRCIN 2 DIN AUDIO SERIAL DATA 3 BCKIN 5 SCKI 6 4 DGND AVDDL LRCIN AGND DIN AGNDR BCKIN AGNDL XTI VOUTR 25 22 27 Hardware Control 26 23 CLKO VOUTL WM8716 MODE 10 19 13 + ZERO 16 - RSTB VMIDR 11 18 + + ML/I2S MC/DM1 MD/DM0 CSB/IWO MODE8X DVDD AVDD AVDDR 7 1 2 3 5 6 4 DGND 25 22 AVDDL LRCIN AGND DIN AGNDR BCKIN AGNDL XTI VOUTR 12 17 AVDD 27 26 23 9 20 + 14 10 19 13 + CLKO LPF WM8716 MODE VOUTL ZERO 16 - LEFT OUTPUT DATA 21 MUTEB RSTB VMIDR VMIDL 28 AVDD 15 XTO DVDD 24 RIGHT OUTPUT DATA 21 LEFT DAC 8 + 11 + 18 + ML/I2S MC/DM1 MD/DM0 CSB/IWO MODE8X DIFFHW NOTE: 14 MUTEB DIFFHW DVDD + LPF VMIDL 28 9 20 XTO DVDD 24 AVDD 15 12 17 AVDD 1. MODE selects left/right data. High for right, Low for left. Figure 21 Example of 2 WM8716 Stereo DACs Configured in Hardware Differential Mode to Provide an Optimum Performance Stereo Output w PD, Rev 4.2, August 2008 23 WM8716 Production Data +VDD MODE8X SCKI XTI PMD-100 XTI Serial Interface Data LRCIN LRCI BCKIN BCKI DIN DIN PROG WCKO LRCIN BCKO BCKIN DOL DIN DOR MODE VOUTL WM8716 VOUTR (STAND ALONE MODE) +VDD ML/I2S NOTES: 1. ML/I2S selects left or right justified inputs. 2. MD/DM0 selects LRCLK polarity. CSB/IWO MD/DM0 MUTEB 3. CSBIWO selects 20 or 24-bit data. Figure 22 Example of WM8716 in MODE8X Operation w PD, Rev 4.2,August 2008 24 WM8716 Production Data PACKAGE DIMENSIONS DS: 28 PIN SSOP (10.2 x 5.3 x 1.75 mm) b DM007.E e 28 15 E1 1 D E GAUGE PLANE 14 c A A2 A1 Θ L 0.25 L1 -C0.10 C Symbols A A1 A2 b c D e E E1 L L1 θ MIN ----0.05 1.65 0.22 0.09 9.90 7.40 5.00 0.55 o 0 REF: Dimensions (mm) NOM --------1.75 0.30 ----10.20 0.65 BSC 7.80 5.30 0.75 1.25 REF o 4 SEATING PLANE MAX 2.0 0.25 1.85 0.38 0.25 10.50 8.20 5.60 0.95 o 8 JEDEC.95, MO-150 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. D. MEETS JEDEC.95 MO-150, VARIATION = AH. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS. w PD, Rev 4.2, August 2008 25 WM8716 Production Data IMPORTANT NOTICE Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current. Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation. 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Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in Wolfson’s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person’s own risk. 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 United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: [email protected] w PD, Rev 4.2,August 2008 26