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1、w WM2002 Stereo Headphone Driver with Wolfson myZoneTM Ambient Noise Cancellation WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http:/ Product Brief, August 2010, Rev 1.1 Copyright 2010 Wolfson Microelectronics plc DESCRIPTION The WM2002 is a low power, high quality stere
2、o headphone driver, delivering Wolfsons patented myZoneTM ambient noise cancellation in a single-ended or BTL (bridge-tied-load) output configuration. The WM2002 supports analogue playback or voice input, and analogue or digital microphone inputs for noise- monitoring microphones. Designed for embed
3、ded applications or incorporated within a stand-alone headset or headphone, the Wolfson myZone ANC noise cancellation engine performs ambient noise cancellation during a voice call or during music playback. The ambient noise input is supported via single-ended or differential analogue microphone int
4、erfaces; digital microphone input is also supported. Up to 10 noise input microphones can be supported at once. The WM2002 provides integrated power management, comprising a DC-DC converter, Charge Pump and LDO Regulators. Many different power supply configurations are thus supported. The entire dev
5、ice can be powered from a single cell AAA battery, or from 2xAAA cells, or from an external regulated supply. System clocking is achieved using an on-chip oscillator. An external clock can be connected directly, if available. The WM2002 is configured using programmable settings stored in an integrat
6、ed non-volatile memory. The configuration stored in the OTP memory is enabled automatically at start-up. If required, the WM2002 can also be configured using register control accessed using a 2-wire serial control interface. FEATURES Wolfson myZone Ambient Noise Cancellation (ANC) - 30dB (peak), 25d
7、B (typical) ambient noise reduction* - Wide noise cancellation bandwidth (40Hz to 4kHz)* - * depending on acoustic configuration - Multiple banks of ANC coefficients can be programmed to support different operating conditions Audio inputs - Up to 10 analogue or digital microphones - Single-ended or
8、differential analogue microphone input - 2 single-ended or 1 differential line input per channel Headphone driver (LDO4VOUT = 1.8V) - 45mW per channel into 16 load - 22mW per channel into 32 load - Single-ended or differential (BTL) drive configuration - -80dB THD+N for differential (BTL) drive Inte
9、gration - On-chip DC-DC boost converter, charge-pump and LDOs - Flexible power supply options, including single cell battery (1 x AAA battery) or (2 x AAA/AAAA) - Internal crystal oscillator Miscellaneous - Monitor pin to select mute / talk-through modes - LED driver - Tone generator for audible sta
10、tus indication - Pop and click noise protection circuit - RFI suppression - 48-pin QFN package (7 x 7 x 0.75mm, 0.5mm pitch) APPLICATIONS “Pod-style” stereo ear-buds, headsets, headphones with ANC “Supra-Aural” stereo headphones with ANC Mono/Stereo Bluetooth headsets with ANC WM2002 Product Preview
11、 w Product Brief, August 2010, Rev 1.1 2 BLOCK DIAGRAM Product Preview WM2002 w Product Brief, August 2010, Rev 1.1 3 PIN CONFIGURATION CFB2 HPGND CPGND 4142434445464748 1 2 3 4 5 6 7 8 2019181716151413 32 31 30 29 28 27 26 25 LED/DMICDAT5 SCAN MON ADDR SDA SCLK LDO1VDD LDO1VOUT HPOUTRN HPOUTRP CPVO
12、UT BATTVDD CFB1 WM2002 9 10 11 12 MICVDD MICBIAS LDO3VOUT AGND DC1VOUT XTO36 35 34 33DC1LX SYSVDD 24232221 37383940 ORDERING INFORMATION DEVICE TEMPERATURE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE WM2002GEFL/V -40oC to +85oC 48-pin QFN (Pb-free) MSL3 260oC WM2002GEFL/RV -4
13、0oC to +85oC 48-pin QFN (Pb-free, tape and reel) MSL3 260oC Note: Reel quantity = 2,200 WM2002 Product Preview w Product Brief, August 2010, Rev 1.1 4 PIN DESCRIPTION PIN NAME TYPE DESCRIPTION 1 LED/ DMICDAT5 Analogue Output / Digital Input Status LED output / LED Digital microphone data pin 5 2 SCA
14、N Digital Input Digital control input (test functions) - normally tied to DGND 3 MON Digital Input Digital control input (changes ANC filter characteristics, selects mute or talk-through mode) 4 ADDR Digital Input Control interface address select 5 SDA Digital Input/Output Control interface data inp
15、ut / output 6 SCLK Digital Input Control interface clock input 7 LDO1VDD Supply LDO1 supply input 8 LDO1VOUT Analogue Output / Supply LDO1 output / Digital core supply 9 MICVDD Supply MICBIAS supply input 10 MICBIAS Analogue Output Bias supply for external microphones 11 LDO3VOUT Analogue Output / S
16、upply LDO3 output / Analogue supply 12 AGND Supply Analogue supplies ground 13 MICLN Analogue Input Left channel inverting analogue noise cancelling mic input 14 MICLP Analogue Input Left channel non-inverting analogue noise cancelling mic input 15 MICRP Analogue Input Right channel non-inverting an
17、alogue noise cancelling mic input 16 MICRN Analogue Input Right channel inverting analogue noise cancelling mic input 17 INLP Analogue Input Left channel non-inverting differential line input (must be AC-coupled for single-ended operation) 18 INLN Analogue Input Left channel inverting differential l
18、ine input (can be grounded for single-ended operation) 19 INRN Analogue Input Right channel inverting differential line input (can be grounded for single-ended operation) 20 INRP Analogue Input Right channel non-inverting differential line input (must be AC- coupled for single-ended operation) 21 VM
19、IDC Analogue I/O Midrail voltage capacitor connection point 22 LDO4VOUT Analogue Output / Supply LDO4 output / Headphone driver supply 23 HPOUTLP Analogue Output Left headphone non-inverting output 24 HPOUTLN Analogue Output Left headphone inverting output 25 HPGND Supply Headphone driver ground 26
20、HPOUTRN Analogue Output Right headphone inverting output 27 HPOUTRP Analogue Output Right headphone non-inverting output 28 CPVOUT Analogue Output Charge pump output 29 BATTVDD Supply DC1 boost converter supply input / Battery supply 30 CFB2 Analogue I/O Charge pump flyback capacitor connection 31 C
21、FB1 Analogue I/O Charge pump flyback capacitor connection 32 CPGND Supply Charge pump ground 33 DC1LX Analogue I/O DC1 boost converter inductor connection pin 34 DC1VOUT Analogue Output DC1 boost converter output 35 SYSVDD Supply System supply input 36 XTO Analogue Output Crystal drive output 37 XTI
22、 Analogue Input Crystal drive input or CMOS clock input 38 DGND Supply Digital supplies ground 39 PROGVDD Supply OTP Memory programming supply - normally tied to DGND 40 LDO2VOUT Analogue Output / Supply LDO2 output / OTP memory supply 41 VREFC Analogue I/O Voltage reference capacitor connection Pro
23、duct Preview WM2002 w Product Brief, August 2010, Rev 1.1 5 PIN NAME TYPE DESCRIPTION 42 IREFR Analogue Input/Output Current reference resistor connection 43 DMICBVDD Supply Digital buffer supply, including digital microphone interface 44 DMICCLK Digital Output Digital microphone interface clock 45
24、DMICDAT1 Digital Input Digital microphone data pin 1 46 DMICDAT2 Digital Input Digital microphone data pin 2 47 DMICDAT3 Digital Input Digital microphone data pin 3 48 DMICDAT4 Digital Input Digital microphone data pin 4 WM2002 Product Preview w Product Brief, August 2010, Rev 1.1 6 ABSOLUTE MAXIMUM
25、 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
26、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-
27、STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at 30C / 85% Relative Humidity. Not normally stored in moisture barrier bag. MSL2 = out of bag storage for 1 year at 30C / 60% Relative Humidity
28、. Supplied in moisture barrier bag. MSL3 = out of bag storage for 168 hours at 30C / 60% Relative Humidity. Supplied in moisture barrier bag. The Moisture Sensitivity Level for each package type is specified in “Ordering Information”. CONDITION MIN MAX BATTVDD -0.3V +1.8V SYSVDD, MICVDD, LDO1VDD, DM
29、ICBVDD -0.3V +3.6V PROGVDD -0.3V +6.75V Voltage range digital inputs DGND - 0.3V DMICBVDD + 0.3V Voltage range analogue inputs AGND - 0.3V LDO3VOUT + 0.25V Operating temperature range, TA -40C +85C Storage temperature after soldering -65C +150C RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN T
30、YP MAX UNIT DC Boost converter input BATTVDD 0.9 1.6 V Digital buffer supply DMICBVDD 1.4 2.5 V MICBIAS supply MICVDD 2.3 2.7 3.3 V Digital core supply (LDO1) LDO1VDD 1.1 3.3 V System supply (LDO2, LDO3 and LDO4) SYSVDD 2.0 3.3 V OTP Memory programming supply (see Note 3) PROGVDD 6.25 6.5 6.75 V Gro
31、und DGND, AGND, CPGND, HPGND 0 V Notes: 1. Analogue and digital grounds must always be within 0.3V of each other. 2. All supplies are completely independent from each other (i.e. not internally connected). 3. The OTP Memory programming supply (PROGVDD) should only be present when programming the OTP
32、. At other times, this pin should be tied to DGND. Product Preview WM2002 w Product Brief, August 2010, Rev 1.1 7 TYPICAL APPLICATIONS A typical application circuit is illustrated in Figure 1, showing the line inputs, ANC microphone inputs, and stereo headphone output. Control Interface SDA SCLK WM2
33、002 Oscillator MICBIAS Digital Microphone Interface DMICDAT4 INLN INLP VMIDC XTI DMICDAT3 DMICDAT2 DMICDAT1 DMICCLK Pop these inputs are digitized by two Analogue to Digital Converters (ADCs), then filtered and processed in accordance with the acoustic parameters programmed into the WM2002. The nois
34、e cancellation signals are then output via two Digital to Analogue Converters (DACs) and mixed with the received voice or audio playback (line) signals. The ANC engine can support multiple noise cancellation filter coefficients, to enable best performance under different ambient noise conditions and
35、 different audio playback conditions. Other user-selectable options are also available, such as mute/talk-through modes. Noise cancellation is applied selectively to different audio frequency bands; a low frequency limiter ensures that the ANC algorithms deliver noise reduction in the most sensitive
36、 frequency bands, without introducing distortion in other frequency bands. The ANC engine is adaptive to different ambient noise levels in order to provide the most natural sound at the headphone audio output. It also incorporates a noise gating function, which ensures that the noise cancellation pe
37、rformance is optimised across a wide range of input signal conditions. WM2002 Product Preview w Product Brief, August 2010, Rev 1.1 8 RECOMMENDED EXTERNAL COMPONENTS Figure 2 External Components Diagram Product Preview WM2002 w Product Brief, August 2010, Rev 1.1 9 The recommended external component
38、s are illustrated in Figure 2. This shows the external connections to the audio inputs/outputs, clocking crystal and power management circuits. Note that Figure 2 shows the recommended device configuration for use with a 2.5V external supply. In this example, the DC1 boost converter and the Charge P
39、ump are not used. In other cases where the DC1 boost converter and Charge Pump circuits are used (for example, when the WM2002 is powered from a single AAA battery), some additional external components are required, as shown in Figure 3. Figure 3 External Components - DC1 Boost Converter and Charge
40、Pump WM2002 Product Preview w Product Brief, August 2010, Rev 1.1 10 PACKAGE DIMENSIONS DM079.A FL: 48 PIN QFN PLASTIC PACKAGE 7 X 7 X 0.75 mm BODY, 0.50 mm LEAD PITCH INDEX AREA (D/2 X E/2) TOP VIEW Caaa 2 X E2 E2/2 D2 24 L D2/2 Caaa 2 X 25 36 3748 1 12 13 D E e PIN 1 A A1 SymbolsDimensions (mm) MI
41、NNOMMAXNOTE A b D D2 E E2 e L 0.75 0.300.250.20 7.00 BSC 5.755.655.55 7.00 BSC 0.5 BSC 5.655.755.55 0.350.40.45 1 A1 A3 00.0350.05 0.203 REF NOTES: 1. DIMENSION b APPLIED TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.15 mm AND 0.30 mm FROM TERMINAL TIP. 2. ALL DIMENSIONS ARE IN MILLIMETRES 3. THE
42、 TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-002. 4. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 5. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. 6. REFER TO APPLICATIONS NOTE WAN_0118 FOR FURTHER INFORMATION. JEDEC, MO-
43、220 Tolerances of Form and Position aaa bbb ccc 0.10 0.08 0.10 REF EXPOSED GND PADDLE 6 0.7 0.8 A2-0.550.57 A2 Cccc b Cbbb (A3) C SEATING PLANE Product Preview WM2002 w Product Brief, August 2010, Rev 1.1 11 IMPORTANT NOTICE Wolfson Microelectronics plc (“Wolfson”) products and services are sold sub
44、ject to Wolfsons 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
45、 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 warr
46、anty. 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. Wolf
47、son 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. Wolfso
48、ns 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 customers
49、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 partys products or services does not constitute Wolfsons approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner.