WM7220IMS/RV Wolfson Microelectronics, WM7220IMS/RV Datasheet

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WM7220IMS/RV

Manufacturer Part Number
WM7220IMS/RV
Description
MICROPHONE, MEMS, DIGITAL, STD
Manufacturer
Wolfson Microelectronics
Datasheet

Specifications of WM7220IMS/RV

Brief Features
High SNR Of 58dB, Support Stereo / Array Operation And Automated Flow Solder Assembly
Operating Temperature Range
-40°C To +100°C
No. Of Pins
6
Rohs Compliant
Yes
Ic Function
Digital Silicon Microphone
Supply Voltage Range
1.64V To 3.7V
w
DESCRIPTION
The WM7220 is a low-profile silicon digital microphone. It
offers high Signal to Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The
CMOS/MEMS
reliability and high performance in a miniature, low-profile
package. The WM7220 is designed to withstand the high
temperatures associated with automated flow solder
assembly processes. (Note that conventional microphones
can be damaged by this process.)
The WM7220 incorporates a high performance ADC,
which outputs a single-bit Pulse Density Modulated (PDM)
audio data stream. The WM7220 supports selectable
left/right channel assignment for a two-channel digital
microphone interface, enabling efficient connection of
multiple microphones in stereo/array configurations.
BLOCK DIAGRAM
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WOLFSON MICROELECTRONICS plc
WM7220
membrane
incorporates
technology,
Wolfson’s
at
Digital Silicon Microphone
http://www.wolfsonmicro.com/enews
offering
proprietary
high
FEATURES
APPLICATIONS
High SNR (58dB)
Low power
-
-
Low profile packaging
Support for automated flow solder assembly
PDM digital audio output
Stereo/array operation
Proprietary ADC technology
-
-
-
Top port package
1.64V to 3.7V supply
4.72 x 3.76 x 1.25mm thin package design
Mobile telephone handsets
Portable computers
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
Sleep mode - 10μA
Normal operation - 650μA
Reduced clock jitter sensitivity
Low noise floor modulation
Stable in overload condition
Preliminary Technical Data, October 2010, Rev 2.0
Copyright ©2010 Wolfson Microelectronics plc
WM7220

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WM7220IMS/RV Summary of contents

Page 1

... Mobile telephone handsets • Portable computers • Portable media players • Digital still cameras • Digital video cameras • Bluetooth headsets • Portable navigation devices http://www.wolfsonmicro.com/enews WM7220 Preliminary Technical Data, October 2010, Rev 2.0 Copyright ©2010 Wolfson Microelectronics plc ...

Page 2

WM7220 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 ...

Page 3

... CLK 5 DAT 6 VDD ORDERING INFORMATION DEVICE DESCRIPTION Standard WM7220IMS/V Standard WM7220IMS/RV (tape and reel) Note: Reel quantity = 4,800 All devices are Pb-free and Halogen free. w TYPE Supply Ground Digital Input Channel Select 0 = Data output following rising CLK edge 1 = Data output following falling CLK edge ...

Page 4

WM7220 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 ...

Page 5

Preliminary Technical Data ACOUSTIC AND ELECTRICAL CHARACTERISTICS Test Conditions: VDD=1.8V, 1kHz test signal, CLK=2.4MHz, T PARAMETER SYMBOL Directivity Sensitivity Acoustic Overload Signal to Noise Ratio Total Harmonic Distortion Frequency Response Acoustic Noise Floor Electrical Noise Floor Power Supply Rejection Digital ...

Page 6

WM7220 AUDIO INTERFACE TIMING (LRSEL = 0) (LRSEL = 1) Figure 1 Digital Microphone Interface Timing Test Conditions The following timing information is valid across the full range of recommended operating conditions. PARAMETER Digital Microphone Interface Timing CLK cycle time ...

Page 7

Preliminary Technical Data FREQUENCY RESPONSE CURVE Typical Frequency Response Curve relative to Sensitivity at 1kHz 100 w 1000 Freq uency (Hz) WM7220 10000 PTD, Rev 2.0, October 2010 7 ...

Page 8

WM7220 APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS It is recommended to connect a 0.1μF decoupling capacitor between the VDD and GND pins of the WM7220. A ceramic 0.1μF capacitor with X7R dielectric or better is suitable. The capacitor should be placed ...

Page 9

Preliminary Technical Data RECOMMENDED PCB LAND PATTERNS Figure 3 Recommended Customer PCB Land Pattern (Note that all other dimensions can be obtained from the package dimensions) w WM7220 PTD, Rev 2.0, October 2010 9 ...

Page 10

WM7220 PACKAGE DIMENSIONS MS6: PACKAGE 4.72 x 3.76 x 1.22 mm BODY 0.1 C PIN 1 CORNER TOP VIEW 0. -C- A SIDE VIEW Dimensions (mm) Symbols MIN NOM A 1.15 1.22 4.62 D ...

Page 11

... Preliminary Technical Data 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 ...

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