WM2002GEFL

WM2002 w Stereo Headphone Driver with Wolfson Ambient Noise Cancellation DESCRIPTION FEATURES The WM2002 is a low power, high quality stereo headphone driver, delivering Wolfson’s patented ambient noise cancellation. The WM2002 supports analogue playback or voice input, and analogue microphones for noise cancellation.  Wolfson Ambient Noise Cancellation (ANC) - >30dB (peak), 25dB (typical) ambient noise reduction* - Wide noise cancellation bandwidth (40Hz to 4kHz)* - * depending on acoustic configuration - Up to 3 banks of ANC coefficients can be programmed to support different operating conditions  Audio inputs - Up to 10 analogue noise cancellation microphones - 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 - -82dB THD+N for differential (BTL) drive  Integration - On-chip DC-DC boost converter, charge-pump and LDOs - Flexible power supply options, including single cell battery (1 x AAA battery) - Internal crystal oscillator  Miscellaneous - Monitor pin to select mute / talk-through modes - LED driver - Tone generator for audible status indication - Pop and click noise protection circuit - RFI suppression - 48-pin QFN package (7 x 7 x 0.75mm, 0.5mm pitch) Designed for incorporation within a stand-alone headset or headphone, the Wolfson ANC noise cancellation engine performs ambient noise cancellation during a voice call or during music playback. The WM2002 provides integrated power management, comprising a DC-DC converter, Charge Pump and LDO Regulators. Different power supply configurations can be supported, including operation from a single cell AAA or AA battery, and other configurations using externally regulated supplies. System clocking is achieved using a crystal-controlled on-chip oscillator. An external clock can be connected directly, if available. The WM2002 is configured using programmable settings stored in an integrated 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. APPLICATIONS WOLFSON MICROELECTRONICS plc  “Pod-style” stereo ear-buds, headsets, headphones with ANC  “Supra-Aural” stereo headphones with ANC  Mono/Stereo Bluetooth headsets with ANC Product Brief, September 2013, Rev 4.1 Copyright 2013 Wolfson Microelectronics plc WM2002 Product Brief BLOCK DIAGRAM w Product Brief, September 2013, Rev 4.1 2 WM2002 Product Brief PIN CONFIGURATION ORDERING INFORMATION DEVICE TEMPERATURE RANGE WM2002GEFL/V -40 C to +85 C WM2002GEFL/RV -40 C to +85 C o o o o MOISTURE PACKAGE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE 48-pin QFN (Pb-free) MSL3 260 C 48-pin QFN (Pb-free, tape and reel) MSL3 260 C o o Note: Reel quantity = 2,200 w Product Brief, September 2013, Rev 4.1 3 WM2002 Product Brief PIN DESCRIPTION A description of each pin on the WM2002 is provided below. Note that, where multiple pins share a common name (eg. DGND), these pins should be tied together on the PCB. PIN NAME TYPE DESCRIPTION 1 LED Analogue Output Status LED output 2 DGND Supply Digital supplies ground 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 input / 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 / Supply 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 analogue 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 18 INLN Analogue Input Left channel inverting differential line 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 21 VMIDC 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 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 CFB1 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 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 w Product Brief, September 2013, Rev 4.1 4 WM2002 Product Brief PIN NAME TYPE DESCRIPTION 42 IREFR Analogue Input/Output Current reference resistor connection 43 DBVDD Supply Digital buffer supply 44 DNC n/a Do Not Connect 45 DGND Supply Digital supplies ground 46 DGND Supply Digital supplies ground 47 DGND Supply Digital supplies ground 48 DGND Supply Digital supplies ground 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-020 for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at