WM8951L

w DESCRIPTION The WM8951L is a low power stereo ADC with an integrated microphone interface and crystal oscillator for clock generation. The WM8951L is ideal for voice recorders, wireless microphones and games console accessories. Stereo line and mono microphone level audio inputs are provided, along with a mute function, programmable line level volume control and a bias voltage output suitable for an electret type microphone. Stereo 24-bit multi-bit sigma delta ADCs are used with oversampling decimation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes and extensive power management facilities. The device is available in a small 28 lead 5x5mm quad flat leadless package (QFN). WM8951L Stereo ADC with Microphone Input and Clock Generator FEATURES • Audio Performance ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V - Low Power - 1.42 – 3.6V Digital Supply Operation - 1.8 – 3.6V Analogue Supply Operation Sampling 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 Available in 5x5mm 28-lead QFN package - • • • • • • APPLICATIONS • • • W ireless microphones Voice recorders Games console accessories BLOCK DIAGRAM W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, December 2007 Rev 4.1 Copyright ©2007 Wolfson Microelectronics plc WM8951L TABLE OF CONTENTS Production Data DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION ................................................................................................4 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY .....................................................................................................7 POWER CONSUMPTION ......................................................................................8 MASTER CLOCK TIMING......................................................................................9 DIGITAL AUDIO INTERFACE – MASTER MODE ....................................................... 10 DIGITAL AUDIO INTERFACE – SLAVE MODE .......................................................... 11 MPU INTERFACE TIMING .......................................................................................... 12 DEVICE DESCRIPTION.......................................................................................14 INTRODUCTION ......................................................................................................... 14 AUDIO SIGNAL PATH................................................................................................. 14 DEVICE OPERATION ................................................................................................. 20 AUDIO DATA SAMPLING RATES............................................................................... 25 ACTIVATING DSP AND DIGITAL AUDIO INTERFACE .............................................. 30 SOFTWARE CONTROL INTERFACE......................................................................... 30 POWER DOWN MODES ............................................................................................ 32 REGISTER MAP ......................................................................................................... 34 DIGITAL FILTER CHARACTERISTICS ...............................................................37 TERMINOLOGY .......................................................................................................... 37 ADC FILTER RESPONSES .................................................................................38 ADC HIGH PASS FILTER ........................................................................................... 39 APPLICATIONS INFORMATION .........................................................................40 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 40 PACKAGE DIMENSIONS ....................................................................................41 IMPORTANT NOTICE ..........................................................................................42 ADDRESS: .................................................................................................................. 42 w PD Rev 4.1 December 2007 2 Production Data WM8951 PIN CONFIGURATION ORDERING INFORMATION DEVICE TEMPERATURE RANGE -25 to +85oC AVDD RANGE 1.8 to 3.6V PACKAGE 28-lead QFN (lead free) 28-lead QFN (lead free, tape and reel) MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE W M8951LGEFL MSL 1 260°C W M8951LGEFL/R Note: Reel quantity = 3,500 -25 to +85oC 1.8 to 3.6V MSL 1 260°C w PD Rev 4.1 December 2007 3 WM8951L PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Note: 1. 2. Pull Up/Down only present when Control Register Interface ACTIVE=0 to conserve power. NAME XTI/MCLK XTO DCVDD DGND DBVDD CLKOUT BCLK TP1 TP2 ADCDAT ADCLRC AVDD2 DNC DNC AGND2 DNC DNC AVDD AGND VMID MICBIAS MICIN RLINEIN LLINEIN MODE CSB SDIN SCLK TYPE Digital Input Digital Output Supply Ground Supply Digital Output Digital Input/Output Test Pin Test Pin Digital Output Digital Input/Output Supply Do Not Connect Do Not Connect Ground Do Not Connect Do Not Connect Supply Ground Analogue Output Analogue Output Analogue Input Analogue Input Analogue Input Digital Input Digital Input Digital Input/Output Digital Input Crystal Output Digital Core VDD Digital GND Digital Buffers VDD Buffered Clock Output Digital Audio Bit Clock, Pull Down, (see Note 1) Connect to ground DESCRIPTION Crystal Input or Master Clock Input (MCLK) Production Data Connect to ground in slave mode / Leave floating in master mode ADC Digital Audio Data Output ADC Sample Rate Left/Right Clock, Pull Down (see Note 1) Analogue VDD Leave this pin floating Leave this pin floating Analogue GND Leave this pin floating Leave this pin floating Analogue VDD Analogue GND Mid-rail reference decoupling point Electret Microphone Bias Microphone Input (AC coupled) Right Channel Line Input (AC coupled) Left Channel Line Input (AC coupled) Control Interface Selection, Pull Up (see Note 1) 3-Wire MPU Chip Select/ 2-Wire MPU interface address selection, active low, Pull up (see Note 1) 3-Wire MPU Data Input / 2-Wire MPU Data Input 3-Wire MPU Clock Input / 2-Wire MPU Clock Input It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB. w PD Rev 4.1 December 2007 4 Production Data WM8951 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. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson 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 0.5465fs -3dB -0.5dB -0.1dB Table 25 Digital Filter Characteristics -60 3.7 10.4 21.6 dB Hz -60 0 0.5fs +/- 0.05 dB 0.4535fs dB dB ADC Filter Type 1 (USB mode, 272fs or Normal mode operation) TERMINOLOGY 1. 2. Stop Band Attenuation (dB) - the degree to which the frequency spectrum is attenuated (outside audio band) Pass-band Ripple – any variation of the frequency response in the pass-band region w PD Rev 4.1 December 2007 37 WM8951L ADC FILTER RESPONSES 0.02 0 0.01 -20 0 Response (dB) Production Data Response (dB) -0.01 -0.02 -0.03 -0.04 -40 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 25 ADC Digital Filter Frequency Response –Type 0 Figure 26 ADC Digital Filter Ripple –Type 0 0.02 0 0.01 -20 0 Response (dB) Response (dB) -0.01 -0.02 -0.03 -0.04 -40 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 27 ADC Digital Filter Frequency Response –Type 1 Figure 28 ADC Digital Filter Ripple –Type 1 0.02 0 0.01 -20 0 Response (dB) Response (dB) -0.01 -0.02 -0.03 -0.04 -40 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 29 ADC Digital Filter Frequency Response –Type 2 Figure 30 ADC Digital Filter Ripple –Type 2 w PD Rev 4.1 December 2007 38 Production Data 0.02 0 0.01 -20 0 Response (dB) WM8951 Response (dB) -0.01 -0.02 -0.03 -0.04 -40 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 31 ADC Digital Filter Frequency Response –Type 3 Figure 32 ADC Digital Filter Ripple –Type 3 ADC HIGH PASS FILTER The WM8951L 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 w PD Rev 4.1 December 2007 39 WM8951L APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS Production Data Figure 33 External Components Diagram w PD Rev 4.1 December 2007 40 Production Data WM8951 PACKAGE DIMENSIONS FL: 28 PIN QFN PLASTIC PACKAGE 5 X 5 X 0.9 mm BODY, 0.50 mm LEAD PITCH CORNER TIE BAR 5 22 D2 B D2/2 27 28 L SEE DETAIL A D INDEX AREA (D/2 X E/2) DM023.G 21 EXPOSED GROUND 6 PADDLE A 1 2 E2/2 A E2 E 15 7 SEE DETAIL B aaa C aaa C 14 e 13 B 8 b ccc M C A B 2X 2X BOTTOM VIEW ccc C (A3) 1 A 0.08 C SEATING PLANE TOP VIEW DETAIL A 1 bbb M C A B 28x b CORNER TIE BAR 5 0. 15 C SIDE VIEW 1 e/2 TERMINAL TIP DETAIL B DATUM L A1 0.210mm m m 0. 56 6 28x K e EXPOSED GROUND PADDLE R 0. 38 m m L1 L1 R 1 Symbols A A1 A3 b D D2 E E2 e L L1 R K aaa bbb ccc REF: MIN 0.85 0 0.18 3.2 3.2 0.35 Dimensions (mm) NOM MAX 0.90 1.00 0.02 0.05 0.2 REF 0.23 0.30 5.00 BSC 3.3 3.4 5.00 BSC 3.3 3.4 0.5 BSC 0.4 0.45 0.1 NOTE 1 2 2 1 b(min)/2 0.20 Tolerances of Form and Position 0.15 0.10 0.10 JEDEC, MO-220, VARIATION VHHD-1 NOTES: 1. DIMENSION b APPLIED TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL 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: LARGER 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 6. REFER TO APPLICATION NOTE WAN_0118 FOR FURTHER INFORMATION REGARDING PCB FOOTPRINTS AND QFN PACKAGE SOLDERING. w PD Rev 4.1 December 2007 41 WM8951L IMPORTANT NOTICE Production Data W olfson 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. In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product. Wolfson’s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer’s own risk. Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. Any provision or publication of any third party’s products or services does not constitute Wolfson’s approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner. Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon. 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: W olfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w PD Rev 4.1 December 2007 42