WM7120 Wolfson Microelectronics plc, WM7120 Datasheet

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WM7120

Manufacturer Part Number
WM7120
Description
Analogue Silicon Microphone
Manufacturer
Wolfson Microelectronics plc
Datasheet

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DESCRIPTION
The WM7120 is a compact high Signal to Noise Ratio
(SNR) silicon analogue microphone for use in consumer
applications requiring low supply current, typically 140μA,
and excellent signal quality. It offers low THD and good
linearity to offer excellent sound quality.
Microelectronics’
technology it delivers high reliability and performance in a
miniature low profile package.
The WM7120 can withstand the high temperatures needed
for automated reflow solder assembly, which can damage
conventional microphones.
equipment can be used for assembly on to circuit boards.
The WM7120E offers tighter sensitivity tolerance which
reduces the variation between microphones and removes
the need for production in-line calibration to compensate for
microphone variation.
BLOCK DIAGRAM
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WOLFSON MICROELECTRONICS plc
unique
CMOS/MEMS
Automated pick and place
Analogue Silicon Microphone
at
http://www.wolfsonmicro.com/enews/
Using Wolfson
membrane
FEATURES
APPLICATIONS
Excellent SNR and Sensitivity tolerance options
-
-
Low supply current 140μA
Low profile packaging
Automated flow solder assembly
Analogue output
Top Port Package
1.5V to 3.7V supply
3.76mm x 2.95mm x 1.10mm Package
Mobile phone handsets
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
Portable games consoles
WM7120IMS, SNR 59dB, Sensitivity +/-3dB
WM7120IMSE, SNR 59dB, Sensitivity +/-1dB
WM7120 Series
Copyright ©2009 Wolfson Microelectronics plc
Pre-Production, May 2009, Rev 3.0

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WM7120 Summary of contents

Page 1

... Analogue Silicon Microphone DESCRIPTION The WM7120 is a compact high Signal to Noise Ratio (SNR) silicon analogue microphone for use in consumer applications requiring low supply current, typically 140μA, and excellent signal quality. It offers low THD and good linearity to offer excellent sound quality. ...

Page 2

... WM7120 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 RECOMMENDED OPERATING CONDITIONS ..................................................... 4 ACOUSTIC AND ELECTRICAL CHARACTERISTICS .......................................... 5 TERMINOLOGY ............................................................................................................ 5 APPLICATIONS INFORMATION ........................................................................... 7 RECOMMENDED EXTERNAL COMPONENTS ............................................................ 7 CONNECTION TO A WOLFSON AUDIO CODEC ........................................................ 7 PACKAGE DIMENSIONS ...................................................................................... 8 RECOMMENDED CUSTOMER LAND PATTERNS ............................................... 9 IMPORTANT NOTICE ...

Page 3

... Analogue ground Supply Analogue ground Supply Analogue supply MOISTURE SENSITIVITY TEMPERATURE RANGE o -40 to +100 C o -40 to +100 C o -40 to +100 C o -40 to +100 C WM7120 PEAK SOLDERING LEVEL TEMPERATURE o MSL2A +260 C o MSL2A +260 C o MSL2A +260 C o MSL2A +260 C PP, Rev 3.0, May 2009 ...

Page 4

... WM7120 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 therefore generically susceptible to damage from excessive static voltages ...

Page 5

... Weighted 20Hz – 20kHz ENL A- Weighted 20Hz – 20kHz PSRR 40 Z OUT THD < 10% TYP MAX UNIT Omni-directional -42 -39 dB -42 -41 dB 140 190 μA 0. SPL 50 dB 100 Ω 20 kΩ 125 dB SPL PP, Rev 3.0, May 2009 WM7120 NOTE Standard Enhanced 5 ...

Page 6

... WM7120 FREQUENCY RESPONSE CURVE w Pre-Production PP, Rev 3.0, May 2009 6 ...

Page 7

... Wolfson has a range of audio CODEC’s, DAC’s and ADC’s with microphone input interfaces which support the direct connection of the WM7120 example, Figure 2 details the connection of the WM7120 to the WM8990 audio CODEC. The same principles can be applied to Wolfson devices which support microphone inputs ...

Page 8

... WM7120 PACKAGE DIMENSIONS MS4: PACKAGE 3.76 x 2.95 x 1.10 mm BODY 0.1 C TOP VIEW 0.05 C -C- A SIDE VIEW Dimensions (mm) Symbols MIN NOM A 1.00 1.10 3.66 3. 2.85 2.95 F 0.5 0.65 H 1.03 1.18 I 2.31 2.46 J 1.50 1.65 K 0.50 0.65 L 1.325 1.475 M 1.16 N 1.90 O 2.71 0.50 0.55 1 1.31 2 0.65 0.80 3 NOTES: 1. THE SEATING PLANE IS REPRESENTED BY PRIMARY DATUM -C- 2. THE DEVIATION FROM THE SEATING PLANE DUE TO WARPAGE OR TWIST IS SPECIFIED AS MAX 50μm (FLATNESS). ...

Page 9

... Pre-Production RECOMMENDED CUSTOMER LAND PATTERNS Figure 3 Recommended Customer PCB Land Pattern w WM7120 PP, Rev 3.0, May 2009 9 ...

Page 10

... WM7120 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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