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CDBWM9082-M-1

CDBWM9082-M-1

  • 厂商:

    CIRRUS(凌云)

  • 封装:

  • 描述:

    EVAL BD - WM9082 MINI EVAL BOARD

  • 数据手册
  • 价格&库存
CDBWM9082-M-1 数据手册
w WM9082 PDM Input Mono 3W Class D Speaker Driver DESCRIPTION FEATURES The WM9082 is a high-performance sigma-delta Class D speaker driver. Audio input is supported using a stereo PDM interface; clock and control-code detection circuitry supports all of the audio and control functions via a 2-wire interface.  The digital audio interface provides excellent noise immunity, eliminating traditional input-filtering components. The flexible 2-wire interface minimises the PCB footprint and simplifies software development. The combined audio and control interface configuration is ideal for enabling the WM9082 to be located close to the speaker; this reduces the length of the output connections, giving good EMC performance and removing the need for output filter components. The sigma-delta architecture provides good power efficiency and improved EMI performance with respect to traditional PWM Class D designs. Sigma-Delta Class-D speaker driver - 92dB SNR - ‘A’ weighted 2.5W into 4 (5V supply, 1% THD) - 1.3W into 4 (3.6V supply, 1% THD) - 1.25W into 8 (5V supply, 1% THD) - 650mW into 8 (3.6V supply, 1% THD  Stereo PDM digital audio input  Supports 32kHz, 44.1kHz, 48kHz sample rates (128fs input)  Automatic Left/Right channel selection  First-order high pass filter (HPF)  RF noise suppression  Pop and click suppression  Programmable output slew rates for low EMI  Short-circuit and thermal protection  9-ball CSP package A first-order high-pass filter can be selected on the input signal to remove DC offsets and help to prevent speaker damage. Other features include a low-power mute state, and output slew-rate control. APPLICATIONS Short-circuit and thermal protection is provided. The WM9082 is supplied in a 9-ball 1.56 x 1.46mm CSP package, with 0.5mm ball pitch.  Mobile Handsets  Portable Media Players (PMP)  Notebooks / Laptop computers  LCD televisions BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Production Data, August 2012, Rev 4.1 Copyright 2012 Wolfson Microelectronics plc WM9082 Production Data TABLE OF CONTENTS DESCRIPTION ....................................................................................................... 1  FEATURES ............................................................................................................ 1  APPLICATIONS..................................................................................................... 1  BLOCK DIAGRAM ................................................................................................ 1  TABLE OF CONTENTS ......................................................................................... 2  PIN CONFIGURATION .......................................................................................... 3  ORDERING INFORMATION .................................................................................. 3  PIN DESCRIPTION ................................................................................................ 3  ABSOLUTE MAXIMUM RATINGS ........................................................................ 4  RECOMMENDED OPERATING CONDITIONS ..................................................... 4  ELECTRICAL CHARACTERISTICS ..................................................................... 5  TERMINOLOGY ............................................................................................................... 6  TYPICAL PERFORMANCE ................................................................................... 7  SIGNAL TIMING REQUIREMENTS ...................................................................... 8  PDM AUDIO INTERFACE TIMING .................................................................................. 8  DEVICE DESCRIPTION ........................................................................................ 9  INTRODUCTION .............................................................................................................. 9  PDM AUDIO INTERFACE ................................................................................................ 9  DEVICE CONTROL CODES .......................................................................................... 10  INITIAL POWER-UP .................................................................................................................................. 12  CONFIGURATION EVENTS ..................................................................................................................... 12  START-UP EVENTS ................................................................................................................................. 13  STANDBY EVENTS .................................................................................................................................. 14  SHUTDOWN EVENTS .............................................................................................................................. 14  STATE TRANSITION DIAGRAM ............................................................................................................... 15  SPEAKER DRIVER ........................................................................................................ 16  RESETS AND SHUTDOWN .......................................................................................... 16  APPLICATIONS INFORMATION ........................................................................ 17  RECOMMENDED EXTERNAL COMPONENTS ............................................................ 17  PCB LAYOUT CONSIDERATIONS ............................................................................... 20  PACKAGE DIMENSIONS .................................................................................... 21  PACKAGE DIAGRAM FOR DEVICES MARKED LT9 ................................................... 21  PACKAGE DIAGRAM FOR DEVICES MARKED JC5 ................................................... 22  IMPORTANT NOTICE ......................................................................................... 23  ADDRESS: ..................................................................................................................... 23  REVISION HISTORY ........................................................................................... 24  w PD, August 2012, Rev 4.1 2 WM9082 Production Data PIN CONFIGURATION The WM9082 is supplied in a 9-ball CSP format. The pin configuration is illustrated below, showing the top-down view from above the chip. ORDERING INFORMATION ORDER CODE TEMPERATURE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE -40C to +85C 9-ball CSP (Pb-free, tape and reel) MSL1 260 C WM9082ECSN/R o Note: Reel quantity = 5,000 PIN DESCRIPTION PIN NO NAME A1 SPKOUTP A2 DNC A3 TYPE DESCRIPTION Analogue Output Positive BTL speaker output GND Supply Ground B1 SPKVDD Supply Class D output driver supply B2 SPKGND Supply Ground B3 DVDD Supply Digital supply C1 SPKOUTN Analogue Output Negative BTL speaker output C2 IN2 Digital Input PDM input (CLK or Left DATA input) C3 IN1 Digital Input PDM input (CLK or Right DATA input) w Do not connect PD, August 2012, Rev 4.1 3 WM9082 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. 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 24 consecutive 0’s is received on the PDM audio interface.) Table 8 WM9082 Standby Events Note that repeated instances of any Control Code will not cause more than one state transition until audio data or a different Control Code has been received. This prevents the WM9082 from cycling between the “ON” state and the “STANDBY” state in the event of repeated Control Codes. SHUTDOWN EVENTS If the CLK input is not present at any time, this results in a transition to the “OFF” state. The WM9082 will remain in the “OFF” state until the CLK input restarts. w PD, August 2012, Rev 4.1 14 WM9082 Production Data STATE TRANSITION DIAGRAM The WM9082 operating states and transitions are illustrated in Figure 3. Figure 3 State Transition Diagram w PD, August 2012, Rev 4.1 15 WM9082 Production Data SPEAKER DRIVER The speaker outputs SPKOUTP and SPKOUTN operate in a BTL configuration. These pins provide a differential output for direct connection to the loudspeaker. In a typical application, no other external components are required for the loudspeaker connection. The sigma-delta architecture of the Class D driver is more linear and power efficient than traditional PWM implementations, resulting in reduced power consumption and improved EMI characteristics. The speaker driver is disabled during start-up and following receipt of selected Control Codes which can be used to configure the WM9082. The driver is automatically re-enabled on receipt of any audio data. RESETS AND SHUTDOWN A power on reset circuit ensures correct start-up and shut-down when the DVDD supply rail is enabled or disabled. The WM9082 is held in the “OFF” state when there is no CLK signal detected on the IN1 or IN2 pins; the Shutdown current in the “OFF” state is noted in the “Electrical Characteristics” section. Short circuit and thermal protection is also provided. In the event of an output short-circuit or an overtemperature condition, the WM9082 will protect itself by disabling the Class D speaker driver. The WM9082 will automatically recover and continue normal operation when the fault condition is cleared. w PD, August 2012, Rev 4.1 16 WM9082 Production Data APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS POWER SUPPLY DECOUPLING Electrical coupling exists particularly in digital logic systems where switching in one sub-system causes fluctuations on the power supply. This effect occurs because the inductance of the power supply acts in opposition to the changes in current flow that are caused by the logic switching. The resultant variations (or ‘spikes’) in the power supply voltage can cause malfunctions and unintentional behaviour in other components. A decoupling (or ‘bypass’) capacitor can be used as an energy storage component which will provide power to the decoupled circuit for the duration of these power supply variations, protecting it from malfunctions that could otherwise arise. Coupling also occurs in a lower-frequency form when ripple is present on the power supply rail caused by changes in the load current or by limitations of the power supply regulation method. In audio components such as the WM9082, these variations can alter the performance of the signal path, leading to degradation in signal quality. A decoupling (or ‘bypass’) capacitor can be used to filter these effects, by presenting the ripple voltage with a low impedance path that does not affect the circuit to be decoupled. These coupling effects are addressed by placing a capacitor between the supply rail and the corresponding ground reference. In the case of systems comprising multiple power supply rails, decoupling should be provided on each rail. The recommended power supply decoupling capacitors for WM9082 are listed below in Table 9. POWER SUPPLY DECOUPLING CAPACITOR DVDD 0.1F ceramic SPKVDD 4.7F ceramic Table 9 Power Supply Decoupling Capacitors All decoupling capacitors should be placed as close as possible to the WM9082 device. Due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the selected components provide the required capacitance across the required temperature and voltage ranges in the intended application. For most application the use of ceramic capacitors with capacitor dielectric X5R is recommended. CLASS D SPEAKER CONNECTIONS The WM9082 incorporates a Class D speaker driver, which offers high amplifier efficiency at large signal levels. As the Class D output is a sigma-delta modulated signal, the choice of speakers and tracking of signals is important for ensuring good performance and reducing EMI. The efficiency of the speaker drivers is affected by the series resistance between the WM9082 and the speaker (e.g. PCB track loss and inductor ESR) as shown in Figure 4. This resistance should be as low as possible to maximise efficiency. w PD, August 2012, Rev 4.1 17 WM9082 Production Data Figure 4 Speaker Connection Losses The Class D output requires external filtering in order to recreate the audio signal. This may be nd implemented using a 2 order LC filter, or else may be achieved by using a loudspeaker whose internal inductance provides the required filter response. An LC filter should be used if the loudspeaker characteristics are unknown or unsuitable, or if the length of the loudspeaker connection is likely to lead to EMI problems. A suitable LC filter implementation is illustrated in Figure 5. Figure 5 Class D Output Filter Components A simple equivalent circuit of a loudspeaker consists of a serially connected resistor and inductor, as shown in Figure 6. This circuit provides a low pass filter for the speaker output. If the loudspeaker characteristics are suitable, then the loudspeaker itself can be used in place of the filter components described earlier. This is known as ‘filterless’ operation. Figure 6 Speaker Equivalent Circuit for Filterless Operation w PD, August 2012, Rev 4.1 18 WM9082 Production Data For filterless Class D operation, it is important to ensure that a speaker with suitable inductance is chosen. For example, if we know the speaker impedance is 8Ω and the desired cut-off frequency is 20kHz, then the optimum speaker inductance may be calculated as: 8 loudspeakers typically have an inductance in the range 20H to 100H, however, it should be noted that a loudspeaker inductance will not be constant across the relevant frequencies for Class D operation (up to and beyond the Class D switching frequency). The Class D outputs of the WM9082 operate at much higher frequencies than is recommended for most speakers; care should be taken to ensure that the cut-off frequency of the loudspeaker’s filtering is low enough to suppress the high frequency energy of the Class D switching and, in so doing, to prevent speaker damage. A simple test can be used to confirm if the loudspeaker is compatible with filterless operation. Under quiescent input conditions (idle digital audio input while in the ON state), the SPKVDD current is measured with the speaker disconnected, and measured again with the speaker connected. If the SPKVDD current increases by more than 10mA when the speaker is connected, then the speaker alone is not effective as a filter, and it is recommended to consider changing the speaker or adding LC filter components. RECOMMENDED EXTERNAL COMPONENTS DIAGRAM Figure 7 provides a summary of recommended external components for WM9082. Note that the actual requirements may differ according to the specific target application. Figure 7 WM9082 Recommended External Components Diagram w PD, August 2012, Rev 4.1 19 WM9082 Production Data PCB LAYOUT CONSIDERATIONS Poor PCB layout will degrade the performance and be a contributory factor in EMI, ground bounce and resistive voltage losses. All external components should be placed as close to the WM9082 device as possible, with current loop areas kept as small as possible. CLASS D LOUDSPEAKER CONNECTION Long, exposed PCB tracks or connection wires will emit EMI. The distance between the WM9082 and the loudspeaker should therefore be kept as short as possible. Where speakers are connected to the PCB via a cable form, it is recommended that a shielded twisted pair cable is used. The shield should be connected to the main system, with care taken to ensure ground loops are avoided. Further reduction in EMI can be achieved using PCB ground (or VDD) planes and also by using passive LC components to filter the Class D switching waveform. When passive filtering is used, low ESR components should be chosen in order to minimise the series resistance between the WM9082 and the speaker, maximising the power efficiency. LC passive filtering will usually be effective at reducing EMI at frequencies up to around 30MHz. To reduce emissions at higher frequencies, ferrite beads can also be used. These should be positioned as close to the device as possible. These techniques for EMI reduction are illustrated in Figure 8. SPKOUTP WM9082 SPKOUTN WM9082 SPKOUTN WM9082 SPKOUTN EMI Long, exposed tracks emit EMI SPKOUTP Short connection wires will reduce EMI emission SPKOUTP Shielding using PCB ground (or VDD) planes will reduce EMI emission SPKOUTP LOW ESR WM9082 SPKOUTN LOW ESR WM9082 SPKOUTN SPKOUTP LC filtering will reduce EMI emission up to around 30MHz Ferrite beads will reduce EMI emission at frequencies above 30MHz. Figure 8 EMI Reduction Techniques w PD, August 2012, Rev 4.1 20 WM9082 Production Data PACKAGE DIMENSIONS PACKAGE DIAGRAM FOR DEVICES MARKED LT9 B: 9 BALL W-CSP PACKAGE 1.560 X 1.460 X 0.635mm BODY, 0.50 mm BALL PITCH A 4 D DETAIL 1 A2 3 2 DM085.B 1 2 A1 CORNER A E1 B E 4 e 3 C 4X e DETAIL 2 0.05 D1 BOTTOM VIEW TOP VIEW f1 SOLDER BALL f2 h 1 Z A1 DETAIL 1 DETAIL 2 Symbols A A1 A2 D D1 E E1 e f1 f2 MIN 0.618 0.230 0.388 1.550 1.450 Dimensions (mm) NOM MAX 0.635 0.652 0.235 0.240 0.412 0.400 1.570 1.560 1.000 BSC 1.470 1.460 1.000 BSC 0.500 BSC NOTE 3 0.275 0.225 h 0.320 NOTES: 1. PRIMARY DATUM -Z- AND SEATING PLANE ARE DEFINED BY THE SPHERICAL CROWNS OF THE SOLDER BALLS. 2. A1 CORNER IS IDENTIFIED BY INK/LASER MARK ON TOP PACKAGE. 3. ‘e’ REPRESENTS THE BASIC SOLDER BALL GRID PITCH. 4. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. 5. FOLLOWS JEDEC DESIGN GUIDE MO-211-C. w PD, August 2012, Rev 4.1 21 WM9082 Production Data PACKAGE DIAGRAM FOR DEVICES MARKED JC5 B : 9 B A L L W -C S P P A C K A G E 1 .5 7 0 X 1 .4 7 0 X 0 .6 4 9 m m B O D Y , 0 .5 0 m m B A L L P IT C H A 4 D D E T A IL 1 A2 2 3 D M 0 8 5 .C 1 2 A1 CORNER A E1 B E 4 e 3 C 4 X e D E T A IL 2 0 .0 2 5 D1 B O T T O M V IE W T O P V IE W f1 SOLDER BALL f2 h 1 Z A1 D E T A IL 1 D E T A IL 2 S y m b o ls A A1 A2 D D1 E E1 e f1 M IN 0 .6 1 0 0 .2 1 2 0 .3 8 7 1 .5 4 5 1 .4 4 5 D im e n s io n s NOM 0 .6 4 9 0 .2 4 9 0 .4 0 0 1 .5 7 0 1 .0 0 0 B S C 1 .4 7 0 1 .0 0 0 B S C 0 .5 0 0 B S C (m m ) MAX 0 .6 8 8 0 .2 8 6 0 .4 1 3 1 .5 9 5 NO TE 1 .4 9 5 3 0 .2 7 3 f2 0 .2 2 3 h 0 .2 6 1 0 .3 1 1 0 .3 6 1 NO TES: 1 . P R IM A R Y D A T U M -Z - A N D S E A T IN G P L A N E A R E D E F IN E D B Y T H E S P H E R IC A L C R O W N S O F T H E S O L D E R B A L L S. 2 . A 1 C O R N E R IS ID E N T IF IE D B Y IN K /L A S E R M A R K O N T O P P A C K A G E . 3 . ‘e ’ R E P R E S E N T S T H E B A S IC S O L D E R B A L L G R ID P IT C H . 4 . T H IS D R A W IN G IS S U B J E C T T O C H A N G E W IT H O U T N O T IC E . 5 . F O L L O W S J E D E C D E S IG N G U ID E M O -2 1 1 -C . w PD, August 2012, Rev 4.1 22 Production Data WM9082 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 utilized 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 minimize 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 unauthorisedٛ 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: Wolfson 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, August 2012, Rev 4.1 23 WM9082 Production Data REVISION HISTORY DATE REV 05/07/10 1.0 First Release DESCRIPTION OF CHANGES 20/04/11 2.0 Product status updated to preliminary technical data 21/04/11 2.0 Updated pinout changing VREFC to DNC. All associated diagrams and tables also updated to reflect the change PAGE CHANGED BY 1, 4, 16, WF 18 28/04/11 2.0 PSRR typical electrical characteristics values added 5 BM 03/05/11 2.0 In Description, removed ‘The recommended configuration requires only 3 external capacitors’ 1 WF 12/08/11 2.1/2.2 Electrical Characteristics updated. PH Additional Control Codes defined for slew rate control & performance mode. Updates to filterless speaker description & recommendations 15/09/11 2.2 Electrical Characteristics updated PH Default slew rate / operating mode conditions updated 25/10/11 3.0 Product status updated to pre-production 18/05/12 4.0 Electrical Characteristics updated JMacD PH Typical performance graphs added 10/08/12 4.1 Package Diagram DM085C added. w JMacD PD, August 2012, Rev 4.1 24
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