WM7210, WM7210E w Top Port Digital Silicon Microphone DESCRIPTION FEATURES High SNR selectable sensitivity tolerance options The WM7210 is a low-profile silicon digital microphone. It offers high Signal to Noise Ratio (SNR) and low power - WM7210 SNR 58dB, Sensitivity +/-3dB consumption and is suited to a wide variety of consumer - WM7210E SNR 58dB, Sensitivity +/-1dB applications. Low power - Sleep mode - 2 A The WM7210 incorporates Wolfsons proprietary CMOS/MEMS membrane technology, offering high - Normal operation - 735 A reliability and high performance in a miniature, low-profile Low profile packaging package. The WM7210 is designed to withstand the high Support for automated flow solder assembly temperatures associated with automated flow solder PDM digital audio output assembly processes. (Note that conventional microphones Stereo/array operation can be damaged by this process.) Proprietary ADC technology The WM7210 incorporates a high performance ADC, - Reduced clock jitter sensitivity which outputs a single-bit Pulse Density Modulated (PDM) - Low noise floor modulation audio data stream. The WM7210 supports selectable left/right channel assignment for a two-channel digital - Stable in overload condition microphone interface, enabling efficient connection of Top port package multiple microphones in stereo/array configurations. 1.64V to 3.7V supply The WM7210E variant offers a tighter tolerance on the 4.00 x 3.00 x 1.03mm thin package design microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production APPLICATIONS calibration of part-to-part microphone variations. Mobile telephone handsets Portable computers Portable media players Digital still cameras Digital video cameras Bluetooth headsets Portable navigation devices BLOCK DIAGRAM Pre-Production, January 2014, Rev 3.3 WOLFSON MICROELECTRONICS plc Copyright 2014 Wolfson Microelectronics plc WM7210 Pre-Production TABLE OF CONTENTS DESCRIPTION ....................................................................................................... 1 FEATURES ............................................................................................................ 1 APPLICATIONS ..................................................................................................... 1 BLOCK DIAGRAM ................................................................................................ 1 TABLE OF CONTENTS ......................................................................................... 2 PIN CONFIGURATION .......................................................................................... 3 PIN DESCRIPTION ................................................................................................ 3 ORDERING INFORMATION .................................................................................. 3 ABSOLUTE MAXIMUM RATINGS ........................................................................ 4 IMPORTANT ASSEMBLY GUIDELINES .............................................................. 4 RECOMMENDED OPERATING CONDITIONS ..................................................... 4 ACOUSTIC AND ELECTRICAL CHARACTERISTICS ......................................... 5 TERMINOLOGY ............................................................................................................... 6 AUDIO INTERFACE TIMING ........................................................................................... 7 TYPICAL PERFORMANCE ................................................................................... 8 FREQUENCY RESPONSE .............................................................................................. 8 THD RATIO ...................................................................................................................... 8 APPLICATIONS INFORMATION .......................................................................... 9 RECOMMENDED EXTERNAL COMPONENTS .............................................................. 9 OPTIMISED SYSTEM RF DESIGN ................................................................................. 9 CONNECTION TO A WOLFSON AUDIO CODEC .......................................................... 9 RECOMMENDED PCB LAND PATTERNS ................................................................... 10 PACKAGE DIMENSIONS (LGA) ......................................................................... 11 IMPORTANT NOTICE ......................................................................................... 12 ADDRESS: ..................................................................................................................... 12 REVISION HISTORY ........................................................................................... 13 PP, Rev 3.3, January 2014 w 2