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1、w WM8731 / WM8731L Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates WOLFSON MICROELECTRONICS plc Production Data, April 2004, Rev 3.4 Copyright 2004 Wolfson Microelectronics plc DESCRIPTION The WM8731 or WM8731L (WM8731/L) are low power stereo CODECs with an integra
2、ted headphone driver. The WM8731/L is designed specifically for portable MP3 audio and speech players and recorders. The WM8731 is also ideal for MD, CD-RW machines and DAT recorders. Stereo line and mono microphone level audio inputs are provided, along with a mute function, programmable line level
3、 volume control and a bias voltage output suitable for an electret type microphone. Stereo 24-bit multi-bit sigma delta ADCs and DACs are used with oversampling digital interpolation and decimation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are su
4、pported. Stereo audio outputs are buffered for driving headphones from a programmable volume control, line level outputs are also provided along with anti-thump mute and power up/down circuitry. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all feature
5、s including volume controls, mutes, de-emphasis and extensive power management facilities. The device is available in a small 28- pin SSOP package or the smaller 28 lead quad flat leadless package (QFN). FEATURES Highly Efficient Headphone Driver Audio Performance - ADC SNR 90dB (A weighted) at 3.3V
6、, 85dB at 1.8V - DAC SNR 100dB (A weighted) at 3.3V, 95dB at 1.8V Low Power - Playback only 22mW, 8mW (L Variant) - Analogue Pass Through 12mW, 3.5mW (L variant) - 1.42 3.6V Digital Supply Operation - 2.7 3.6V Analogue Supply Operation - 1.8 3.6V Analogue Supply Operation (L Variant) ADC and DAC Sam
7、pling Frequency: 8kHz 96kHz Selectable ADC High Pass Filter 2 or 3-Wire MPU Serial Control Interface Programmable Audio Data Interface Modes - I2S, Left, Right Justified or DSP - 16/20/24/32 bit Word Lengths - Master or Slave Clocking Mode Microphone Input and Electret Bias with Side Tone Mixer Avai
8、lable in 28-Pin SSOP or 28-pin QFN package APPLICATIONS Portable MP3 Players and Recorders CD and Minidisc Recorders PDAs / smartphones BLOCK DIAGRAM MUX MUX VOL VOL ADC ADC DIGITAL FILTERS DIGTAL AUDIO INTERFACE CONTROL INTERFACE DAC DAC VOL/ MUTE VOL/ MUTE H/P DRIVER H/P DRIVER CSB SDIN SCLK RHPOU
9、T LHPOUT ROUT LOUT RLINEIN LLINEIN VMID DBVDD DGND AVDD AGND 0dB/ 20dB MICIN +12 to -34.5dB, 1.5dB Steps CLKOUT +6 to -73dB 1 dB Steps HPVDD HPGND +6 to -73dB 1 dB Steps DCVDD ADCLRC DACLRC BCLK DACDAT ADCDAT OSC XTI/MCLK XTO MODE MICBIAS MUTE Bypass Bypass CLKIN DIVIDER (Div x1, x2) CLKOUT DIVIDER
10、(Div x1, x2) ATTEN/ MUTE MUTE MUTE ATTEN/ MUTE MUTE MUTE MUTE MUTE MUTE +12 to -34.5dB, 1.5dB Steps Side Tone Side Tone W WM8731 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 2 TABLE OF CONTENTS DESCRIPTION .1 FEATURES.1 APPLICATIONS .1 BLOCK DIAGRAM.1 PIN CONFIGURATION - 28 PIN SSOP.3 OR
11、DERING INFORMATION 3 PIN CONFIGURATION 28 PIN QFN.4 ORDERING INFORMATION 4 PIN DESCRIPTION 5 ABSOLUTE MAXIMUM RATINGS.6 RECOMMENDED OPERATING CONDITIONS WM8731.6 RECOMMENDED OPERATING CONDITIONS WM8731L.6 ELECTRICAL CHARACTERISTICS WM87317 TERMINOLOGY.9 POWER CONSUMPTION WM873110 ELECTRICAL CHARACTE
12、RISTICS WM8731L11 TERMINOLOGY.12 POWER CONSUMPTION WM8731L12 MASTER CLOCK TIMING13 DIGITAL AUDIO INTERFACE MASTER MODE.14 DIGITAL AUDIO INTERFACE SLAVE MODE 15 MPU INTERFACE TIMING16 DEVICE DESCRIPTION.18 INTRODUCTION.18 AUDIO SIGNAL PATH.19 DEVICE OPERATION.31 AUDIO DATA SAMPLING RATES.37 ACTIVATIN
13、G DSP AND DIGITAL AUDIO INTERFACE42 SOFTWARE CONTROL INTERFACE.42 POWER DOWN MODES 44 REGISTER MAP .46 DIGITAL FILTER CHARACTERISTICS.51 TERMINOLOGY51 DAC FILTER RESPONSES .52 ADC FILTER RESPONSES .53 ADC HIGH PASS FILTER .54 DIGITAL DE-EMPHASIS CHARACTERISTICS.54 DIGITAL DE-EMPHASIS CHARACTERISTICS
14、.55 RECOMMENDED EXTERNAL COMPONENTS (28-PIN SSOP).56 PACKAGE DIMENSIONS - SSOP .57 PACKAGE DIMENSIONS - QFN58 IMPORTANT NOTICE59 ADDRESS:59 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 3 PIN CONFIGURATION - 28 PIN SSOP 1 AVDD 2 AGND 3 MICBIAS 4 VMID 5 MICIN 6 RLINEIN 7 LLINEIN 8 DCVDD 9
15、MODE 10 CSB SDIN SCLK XTO XTI/MCLK 15 CLKOUT DGND ADCLRC ADCDAT DACDAT DACLRC BCLK DBVDD LHPOUT HPGND HPVDD RHPOUT LOUT ROUT 11 12 13 14 16 17 18 19 20 21 22 23 24 25 28 27 26 ORDERING INFORMATION DEVICE TEMPERATURE RANGE AVDD RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE XWM87
16、31EDS -25 to +85oC 2.7 to 3.6V 28-pin SSOP MSL 1 260C XWM8731EDS/R -25 to +85oC 2.7 to 3.6V 28-pin SSOP (tape and reel) MSL 1 260C Note: Reel quantity = 2,000 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 4 PIN CONFIGURATION 28 PIN QFN RHPOUT LHPOUT HPVDD ADCLRC ADCDAT DACLRC DACDAT XTI/M
17、CLK XTO DCVDD DGND DBVDD CLKOUT BCLK 28 27 26 25 24 23 22MICIN RLINEIN LLINEIN MODE CSB SDIN SCLK 1234567 8 10 9 11 14 13 12 21201918171615 MICBIAS VMID AGND AVDD ROUT LOUT HPGND ORDERING INFORMATION DEVICE TEMPERATURE RANGE AVDD RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE XW
18、M8731EFL -25 to +85oC 2.7 to 3.6V 28 pin QFN MSL 1 260C WM8731LEFL -25 to +85oC 1.8 to 3.6V 28 pin QFN MSL 1 260C XWM8731EFL/R -25 to +85oC 2.7 to 3.6V 28 pin QFN (tape and reel) MSL 1 260C WM8731LEFL/R -25 to +85oC 1.8 to 3.6V 28 pin QFN (tape and reel) MSL 1 260C Note: Reel quantity = 3,500 WM8731
19、 / WM8731L Production Data w PD Rev 3.4 April 2004 5 PIN DESCRIPTION 28 PIN SSOP 28 PIN QFN NAME TYPE DESCRIPTION 1 5 DBVDD Supply Digital Buffers VDD 2 6 CLKOUT Digital Output Buffered Clock Output 3 7 BCLK Digital Input/Output Digital Audio Bit Clock, Pull Down, (see Note 1) 4 8 DACDAT Digital Inp
20、ut DAC Digital Audio Data Input 5 9 DACLRC Digital Input/Output DAC Sample Rate Left/Right Clock, Pull Down (see Note 1) 6 10 ADCDAT Digital Output ADC Digital Audio Data Output 7 11 ADCLRC Digital Input/Output ADC Sample Rate Left/Right Clock, Pull Down (see Note 1) 8 12 HPVDD Supply Headphone VDD
21、9 13 LHPOUT Analogue Output Left Channel Headphone Output 10 14 RHPOUT Analogue Output Right Channel Headphone Output 11 15 HPGND Ground Headphone GND 12 16 LOUT Analogue Output Left Channel Line Output 13 17 ROUT Analogue Output Right Channel Line Output 14 18 AVDD Supply Analogue VDD 15 19 AGND Gr
22、ound Analogue GND 16 20 VMID Analogue Output Mid-rail reference decoupling point 17 21 MICBIAS Analogue Output Electret Microphone Bias 18 22 MICIN Analogue Input Microphone Input (AC coupled) 19 23 RLINEIN Analogue Input Right Channel Line Input (AC coupled) 20 24 LLINEIN Analogue Input Left Channe
23、l Line Input (AC coupled) 21 25 MODE Digital Input Control Interface Selection, Pull Up (see Note 1) 22 26 CSB Digital Input 3-Wire MPU Chip Select/ 2-Wire MPU interface address selection, active low, Pull up (see Note 1) 23 27 SDIN Digital Input/Output 3-Wire MPU Data Input / 2-Wire MPU Data Input
24、24 28 SCLK Digital Input 3-Wire MPU Clock Input / 2-Wire MPU Clock Input 25 1 XTI/MCLK Digital Input Crystal Input or Master Clock Input (MCLK) 26 2 XTO Digital Output Crystal Output 27 3 DCVDD Supply Digital Core VDD 28 4 DGND Ground Digital GND Note: 1. Pull Up/Down only present when Control Regis
25、ter Interface ACTIVE=0 to conserve power. WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 6 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 operatin
26、g 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 precaution
27、s must be taken during handling and storage of this device. 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 Off Vth 0.9 V Hysteresis
28、 VIH 0.3 V DCVDD Threshold Off - On VOL 0.6 V Analogue Reference Levels Reference voltage (VMID) VVMID AVDD/2 V Potential divider resistance RVMID 50k Ohms Line Input to ADC Input Signal Level (0dB) VINLINE 1.0 AVDD/3.3 Vrms A-weighted, 0dB gain fs = 48kHz 85 90 A-weighted, 0dB gain fs = 96kHz 90 Si
29、gnal to Noise Ratio (Note 1,3) SNR A-weighted, 0dB gain fs = 48kHz, AVDD = 2.7V 88 dB Dynamic Range (Note 3) DR A-weighted, -60dB full scale input 85 90 dB Total Harmonic Distortion THD -1dB input, 0dB gain -84 0.006 -74 0.02 dB % 1kHz, 100mVpp 50 Power Supply Rejection Ratio PSRR 20Hz to 20kHz, 100
30、mVpp 45 dB ADC channel separation 1kHz input 90 dB Programmable Gain 1kHz input Rsource 0.584fs -60 dB ADC Filter Type 1 (USB mode, 272fs or Normal mode operation) +/- 0.05dB 0 0.4535fs Passband -6dB 0.5fs Passband Ripple +/- 0.05 dB Stopband 0.5465fs Stopband Attenuation f 0.5465fs -60 dB -3dB 3.7
31、-0.5dB 10.4 High Pass Filter Corner Frequency -0.1dB 21.6 Hz DAC Filter Type 0 (USB mode, 250fs operation) +/- 0.03dB 0 0.416fs Passband -6dB 0.5fs Passband Ripple +/-0.03 dB Stopband 0.584fs Stopband Attenuation f 0.584fs -50 dB DAC Filter Type 1 (USB mode, 272fs or Normal mode operation) +/- 0.03d
32、B 0 0.4535fs Passband -6dB 0.5fs Passband Ripple +/- 0.03 dB Stopband 0.5465fs Stopband Attenuation f 0.5465fs -50 dB Table 31 Digital Filter Characteristics TERMINOLOGY 1. Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band) 2. Pass-band Ripple
33、any variation of the frequency response in the pass-band region WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 52 DAC FILTER RESPONSES -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 00.050.10.150.20.250.30.350.40.450.5 Respon
34、se (dB) Frequency (Fs) Figure 34 DAC Digital Filter Frequency Response Type 0 Figure 35 DAC Digital Filter Ripple Type 0 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 00.050.10.150.20.250.30.350.40.450.5 Response (dB) Frequency (Fs) F
35、igure 36 DAC Digital Filter Frequency Response Type 1 Figure 37 DAC Digital Filter Ripple Type 1 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 00.050.10.150.20.25 Response (dB) Frequency (Fs) Figure 38 DAC Digital Filter Frequency R
36、esponse Type 2 Figure 39 DAC Digital Filter Ripple Type 2 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 53 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.25 -0.2 -0.15 -0.1 -0.05 0 0.05 00.050.10.150.20.25 Response (dB) Frequency (Fs) Figure 40 DAC Digital Filter Fre
37、quency Response Type 3 Figure 41 DAC Digital Filter Ripple Type 3 ADC FILTER RESPONSES -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 00.050.10.150.20.250.30.350.40.450.5 Response (dB) Frequency (Fs) Figure 42 ADC Digital Filter Freq
38、uency Response Type 0 Figure 43 ADC Digital Filter Ripple Type 0 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 00.050.10.150.20.250.30.350.40.450.5 Response (dB) Frequency (Fs) Figure 44 ADC Digital Filter Frequency Response Type 1
39、Figure 45 ADC Digital Filter Ripple Type 1 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 54 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 00.050.10.150.20.25 Response (dB) Frequency (Fs) Figure 46 ADC Digital Filter Frequ
40、ency Response Type 2 Figure 47 ADC Digital Filter Ripple Type 2 -100 -80 -60 -40 -20 0 00.511.522.53 Response (dB) Frequency (Fs) -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 00.050.10.150.20.25 Response (dB) Frequency (Fs) Figure 48 ADC Digital Filter Frequency Response Type 3 Figure 49 ADC Digi
41、tal Filter Ripple Type 3 ADC HIGH PASS FILTER The WM8731/L has a selectable digital high pass filter to remove DC offsets. The filter response is characterised by the following polynomial. H(z) = 1 z-1 1 0.9995 z-1 WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 55 DIGITAL DE-EMPHASIS CHARA
42、CTERISTICS -10 -8 -6 -4 -2 0 0200040006000800010000120001400016000 Response (dB) Frequency (Fs) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0200040006000800010000120001400016000 Response (dB) Frequency (Fs) Figure 50 De-Emphasis Frequency Response (32kHz) Figure 51 De-Emphasis Error (32kHz) -10 -8 -6 -4 -
43、2 0 05000100001500020000 Response (dB) Frequency (Fs) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 05000100001500020000 Response (dB) Frequency (Fs) Figure 52 De-Emphasis Frequency Response (44.1kHz) Figure 53 De-Emphasis Error (44.1kHz) -10 -8 -6 -4 -2 0 05000100001500020000 Response (dB) Frequency (Fs) -
44、0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 05000100001500020000 Response (dB) Frequency (Fs) Figure 54 De-Emphasis Frequency Response (48kHz) Figure 55 De-Emphasis Error (48kHz) WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 56 RECOMMENDED EXTERNAL COMPONENTS (28-PIN SSOP) Figure 56 External Com
45、ponents Diagram WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 57 PACKAGE DIMENSIONS - SSOP 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 JE
46、DEC.95 MO-150, VARIATION = AH. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS. DM007.DDS: 28 PIN SSOP (10.2 x 5.3 x 1.75 mm) Symbols Dimensions (mm) MINNOMMAX A-2.0 A10.05-0.25 A21.651.751.85 b0.220.300.38 c0.09-0.25 D9.9010.2010.50 e E7.407.808.20 5.005.305.60 L0.550.750.95 A A2 A1 141 1528 E1E c
47、L GAUGE PLANE 0.25 e b D SEATING PLANE -C- 0.10 C REF:JEDEC.95, MO-150 E1 L10.125 REF 0.65 BSC L1 0o4o8o WM8731 / WM8731L Production Data w PD Rev 3.4 April 2004 58 PACKAGE DIMENSIONS - QFN NOTES: 1. DIMENSION b APPLIED TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL
48、 TIP. DIMENSION L1 REPRESENTS TERMINAL PULL BACK FROM PACKAGE SIDE WALL. MAXIMUM OF 0.1mm IS ACCEPTABLE. WHERE TERMINAL PULL BACK EXISTS, ONLY UPPER HALF OF LEAD IS VISIBLE ON PACKAGE SIDE WALL DUE TO HALF ETCHING OF LEADFRAME. 2. FALLS WITHIN JEDEC, MO-220 WITH THE EXCEPTION OF D2, E2: D2,E2: LARGE
49、R PAD SIZE CHOSEN WHICH IS JUST OUTSIDE JEDEC SPECIFICATION 3. ALL DIMENSIONS ARE IN MILLIMETRES 4. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. 5. SHAPE AND SIZE OF CORNER TIE BAR MAY VARY WITH PACKAGE TERMINAL COUNT. CORNER TIE BAR IS CONNECTED TO EXPOSED PAD INTERNALLY DM023.DFL: 28 PIN QFN PLASTIC PACKAGE 5 X 5 X 0.9 mm BODY, 0.50 mm LEAD PITCH Caaa INDEX AREA (D/2 X E/2) Caaa2 X 2 X TO