WM8734SEFL Wolfson Microelectronics, WM8734SEFL Datasheet
WM8734SEFL
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WM8734SEFL Summary of contents
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... CD and Minidisc Recorder • MP3 Player / Recorder CONTROL INTERFACE ADC DIGITAL FILTERS ADC DIGTAL AUDIO INTERFACE http://www.wolfsonmicro.com/enews/ WM8734 2 S, Left, Right Justified or DSP W WM8734 DAC MUTE DAC MUTE Production Data, January 2009, Rev 4.3 Copyright ©2009 Wolfson Microelectronics plc ROUT LOUT ...
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WM8734 DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION – SSOP.............................................................................3 ORDERING INFORMATION - SSOP .....................................................................3 PIN DESCRIPTION - SSOP ...................................................................................4 PIN CONFIGURATION – QFN ...............................................................................5 ORDERING INFORMATION - QFN........................................................................5 PIN DESCRIPTION - QFN......................................................................................6 ...
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WM8734 PIN CONFIGURATION – SSOP 20 DGND 1 19 DBVDD 2 18 BCLK 3 17 DACDAT 4 16 DACLRC 5 15 ADCDAT ADCLRC 13 LOUT ROUT 11 AVDD 10 ORDERING INFORMATION - SSOP DEVICE ...
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WM8734 PIN DESCRIPTION - SSOP PIN NAME TYPE 1 DGND Ground 2 DBVDD Supply 3 BCLK Digital Input/Output 4 DACDAT Digital Input 5 DACLRC Digital Input/Output 6 ADCDAT Digital Output 7 ADCLRC Digital Input/Output 8 LOUT Analogue Output 9 ROUT ...
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... WM8734 PIN CONFIGURATION – QFN TOP VIEW ORDERING INFORMATION - QFN TEMPERATURE DEVICE RANGE o WM8734SEFL - WM8734SEFL/R -40 to +85 C Note: Reel quantity = 3,500 w MOISTURE PACKAGE SENSITIVITY LEVEL 28-lead QFN MSL 1 (5x5x0.9mm) (Pb-free) 28-lead QFN MSL 1 (5x5x0.9mm) (Pb-free, tape and reel) Production Data ...
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WM8734 PIN DESCRIPTION - QFN PIN NAME TYPE 1 MCLK Digital Input Not Connect 3 DCVDD Supply 4 DGND Ground 5 DBVDD Supply Not Connect 7 BCLK Digital Input/Output 8 DACDAT Digital Input 9 ...
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WM8734 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 ...
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WM8734 ELECTRICAL CHARACTERISTICS Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER Digital Logic Levels (CMOS Levels) Input LOW level Input HIGH level Output LOW Output HIGH Power On Reset ...
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WM8734 Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER Line Output for DAC Playback Only (Load = 47kΩ. 50pF) 0dBfs Full scale output voltage Signal to Noise Ratio (Note ...
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WM8734 POWER CONSUMPTION (EXAMPLES) MODE DESCRIPTION POWEROFF Record and Playback 0 Playback Only 0 Record Only 0 Standby (clock running) 0 Standby (clock stopped) Power Down 1 (clock running) Power Down 1 (clock stopped) Notes: 1. The data presented here ...
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WM8734 MASTER CLOCK TIMING MCLK Figure 1 System Clock Timing Requirements Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER System Clock Timing Information MCLK System clock pulse width high ...
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WM8734 BCLK (Output) ADCLRC DAC/LRC (Outputs) ADCDAT DACDAT Figure 3 Digital Audio Data Timing – Master Mode Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER SYMBOL Audio Data Input ...
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WM8734 BCLK DACLRC/ ADCLRC DACDAT ADCDAT Figure 5 Digital Audio Data Timing – Slave Mode Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER SYMBOL Audio Data Input Timing Information ...
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WM8734 MPU INTERFACE TIMING CSB SCLK SDIN Figure 6 Program Register Input Timing – 3-Wire MPU Serial Control Mode Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER Program Register ...
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WM8734 t 3 SDIN SCLK t 1 Figure 7 Program Register Input Timing – 2-Wire MPU Serial Control Mode Test Conditions AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, T otherwise stated. PARAMETER Program Register ...
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WM8734 DEVICE DESCRIPTION The WM8734 is a high performance audio CODEC designed specifically for audio applications that require recording and playback features. The CODEC includes line inputs to the on-board ADC, line outputs from the on-board DAC, a configurable digital ...
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WM8734 LINEIN Figure 8 Line Input Schematic The gain between the line inputs and the ADC is logarithmically adjustable from +12dB to –34.5dB in 1.5dB steps under software control. The ADC Full Scale input is 1.0V rms at AVDD = ...
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WM8734 The line inputs are biased internally through the operational amplifier to VMID. Whenever the line inputs are muted or the device placed into standby mode, the line inputs are kept biased to VMID using special anti-thump circuitry. This reduces ...
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WM8734 The use of multi-bit feedback and high oversampling rates reduces the effects of jitter and high frequency noise. The ADC Full Scale input is 1.0V rms at AVDD = 3.3 volts. Any voltage greater than full scale will possibly ...
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WM8734 FROM DIGITAL AUDIO INTERFACE Figure 12 DAC Filter Schematic The DAC digital filter can apply digital de-emphasis under software control, as shown in Table 3. The DAC can also perform a soft mute where the audio data is digitally ...
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WM8734 LINE OUTPUTS The WM8734 provides two low impedance line outputs LLINEOUT and RLINEOUT, suitable for driving typical line loads of impedance 10K and capacitance 50pF. The line output is used to selectively sum the outputs from the DAC or/and ...
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WM8734 Recommended values are C1 = 470nF (10V npo type 47KΩ 100Ω C1 forms a DC blocking capacitor to the line outputs. R1 prevents the output voltage from drifting so protecting equipment connected to the line ...
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WM8734 The digital audio interface takes the data from the internal ADC digital filter and places it on the ADCDAT output. ADCDAT is the formatted digital audio data stream output from the ADC digital filters with left and right channels ...
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WM8734 LEFT CHANNEL DACLRC/ ADCLRC BCLK DACDAT ADCDAT MSB Figure 18 Right Justified Mode In DSP/PCM mode, the left channel MSB is available on either the 1 rising edge of BCLK (selectable by LRP) following a rising edge ...
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WM8734 In all modes DACLRC and ADCLRC must always change on the falling edge of BCLK, refer to Figure 16, Figure 17, Figure 18, Figure 19 and Figure 20. Operating the digital audio interface in DSP mode allows ease of ...
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WM8734 REGISTER ADDRESS 0000111 Digital Audio Interface Format Table 7 Digital Audio Interface Control Note: If right justified 32 bit mode is selected then the WM8734 defaults to 24 bits. MASTER AND SLAVE MODE OPERATION The WM8734 can be configured ...
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WM8734 As a master mode device the WM8734 controls the sequencing of data transfer (ADCDAT, DACDAT) and output of clocks (BCLK, ADCLRC, DACLRC) over the digital audio interface. It uses the timing generated from either its on-board crystal or the ...
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WM8734 Uniquely, the WM8734 offers the user the ability to sample the ADC and DAC at different rates under software control in both Normal and USB modes. The reduces the burden on any controlling DSP. However, the signal processing in ...
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WM8734 SAMPLING RATE ADC kHz 44.1 44.1 8 (Note 1) 8 (Note 1) 88.2 Table 10 Normal Mode Sample Rate Look-up Table Notes not exact, actual = 8.018kHz 2. All other combinations ...
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WM8734 The exact sample rates achieved are defined by the relationships in Table 11 below. TARGET SAMPLING RATE kHz 8 32 44.1 48 88.2 96 Table 11 Normal Mode Actual Sample Rates 128/192fs NORMAL MODE The Normal Mode sample rates ...
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WM8734 USB MODE SAMPLE RATES In USB mode the MCLK/crystal oscillator input is 12MHz only. SAMPLING RATE ADC kHz 48 44.1 (Note 2) 48 44.1 (Note (Note (Note 88.2 (Note 3) ...
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WM8734 the data across the digital interface is correctly synchronised at the 8.021kHz and 44.117kHz rates. The exact sample rates supported for all combinations are defined by the relationships in Table 14 below. TARGET SAMPLING RATE kHz 8 32 44.1 ...
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WM8734 3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE The WM8734 can be controlled using a 3-wire serial interface. SDIN is used for the program data, SCLK is used to clock in the program data and CSB is use to latch in ...
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WM8734 A stop condition is defined when there is a low to high transition on SDIN while SCLK is high start or stop condition is detected out of sequence at any point in the data transfer then the ...
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WM8734 0 Table 19 Standby Mode In STANDBY mode the Control Interface, a small portion of the digital and areas of the analogue circuitry remain active. The active analogue includes the analogue VMID reference so that the analogue line inputs, ...
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WM8734 REGISTER MAP The complete register map is shown in Table 21. The detailed description can be found in the relevant text of the device description. There are 8 registers with 9 bits per register. These can be controlled using ...
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WM8734 REGISTER ADDRESS 0000110 Power Down Control 0000111 Digital Audio Interface Format w BIT LABEL DEFAULT 0 LINEINPD 1 2 ADCPD 1 3 DACPD 1 4 OUTPD 1 7 POWEROFF 1 1:0 FORMAT[1:0] 10 3:2 IWL[1: LRP 0 ...
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WM8734 REGISTER ADDRESS 0001000 Sampling Control 0001001 Active Control Table 21 Register Map Description Note: Unused register bits should be set to ‘0’ except when writing to Register 0000110, when bits 1,5 and 6 should be set to ‘1’. DIGITAL ...
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WM8734 TERMINOLOGY 1. Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band) 2. Pass-band Ripple – any variation of the frequency response in the pass-band region DAC FILTER RESPONSES 0 -20 -40 ...
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WM8734 0 -20 -40 -60 -80 -100 0 0.5 1 1.5 Frequency (Fs) Figure 31 ADC Digital Filter Frequency Response –Type 2 ADC HIGH PASS FILTER The WM8734 has a selectable digital high pass filter to remove DC offsets. The ...
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WM8734 -10 0 5000 10000 Frequency (Fs) Figure 37 De-Emphasis Frequency Response (48kHz) w 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 15000 20000 0 Figure 38 De-Emphasis Error (48kHz) Production Data 5000 10000 ...
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WM8734 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS Figure 39 External Components Diagram Notes: 1. Diagram above is for SSOP package. QFN external components are the same. 2. Where possible recommended that NPO or COG type capacitors should be used ...
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WM8734 MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS To minimise any pop or click noise when the system is powered up or down, the following procedures are recommended. POWER UP SEQUENCE • • • • • POWER DOWN SEQUENCE • ...
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WM8734 PACKAGE DIMENSIONS (SSOP) DS: 20 PIN SSOP (7.2 x 5.3 x 1.75 mm Dimensions Symbols (mm) MIN NOM A ----- A 0. 1.65 1. 0.22 c 0.09 D ...
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WM8734 PACKAGE DIMENSIONS (QFN) FL: 28 PIN QFN PLASTIC PACKAGE 5 CORNER D2 TIE BAR B D2 EXPOSED 6 GROUND PADDLE BOTTOM VIEW (A3 SEATING ...
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... WM8734 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 ...