w WM7110 Series
Analogue Silicon Microphone
WOLFSON MICROELECTRONICS plc
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DESCRIPTION
The WM7110 is a compact high Signal to Noise ratio silicon analogue microphone for use in consumer applications requiring low power consumption, typically 160μA, and excellent signal quality. It offers low THD, good linearity and a flat phase response to offer excellent sound quality. Using Wolfson Microelectronics’ unique CMOS/MEMS membrane technology it delivers high reliability and performance in a miniature low profile package.
The WM7110 can withstand the high temperatures needed for automated reflow solder assembly, which can damage conventional microphones. Automated pick and place equipment can be used for assembly on to circuit boards.
The WM7110H variants offer enhanced SNR performance for improved audio quality.
The WM7110E variants offer tighter sensitivity tolerance which reduces the variation between microphones and removes the need for production in-line calibration to compensate for microphone variation. FEATURES
?Excellent SNR:
- WM7110IMS, SNR 59dB, Sensitivity +/-3dB
- WM7110IMSE, SNR 59dB, Sensitivity +/-1dB - WM7110IMH, SNR 62dB, Sensitivity +/-3dB
- WM7110IMHE, SNR 62dB, Sensitivity +/-1dB ?Low power 160μA
? Low
profile
packaging
?Automated flow solder assembly
? Analogue
output
? Top
Port
Package
? 1.5V to 3.7V supply
? 4.72mm x 3.76mm x 1.25mm Package Design APPLICATIONS
? Mobile
phone
handsets
? Portable
media
layers
? Digital
still
cameras
?Digital video cameras
? Bluetooth
headsets
? Portable
navigation
devices
?Portable games consoles
BLOCK DIAGRAM
WM7110
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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 RECOMMENDED OPERATING CONDITIONS.....................................................4 ACOUSTIC AND ELECTRICAL CHARACTERISTICS..........................................5 STANDARD AND STANDARD ENHANCED.................................................................5 HIGH PERFORMANCE AND HIGH PERFORMANCE ENHANCED..............................5 TERMINOLOGY............................................................................................................5 APPLICATIONS INFORMATION...........................................................................6 RECOMMENDED EXTERNAL COMPONENTS............................................................6 CONNECTION TO A WOLFSON AUDIO CODEC........................................................6 PACKAGE DIMENSIONS......................................................................................7 RECOMMENDED CUSTOMER LAND PATTERNS...............................................8 IMPORTANT NOTICE............................................................................................9 ADDRESS:. (9)
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PIN CONFIGURATION
Top View
PIN DESCRIPTION
PIN NAME TYPE
DESCRIPTION
1 OUTPUT Analogue Output
Microphone analogue output signal 2 GND Supply Analogue ground 3 GND Supply Analogue ground 4 VDD Supply Analogue supply
ORDERING INFORMATION
ORDER CODE DESCRIPTION WM7110IMS
Standard
WM7110IMS/R Standard (tape and reel)
WM7110IMSE Standard Enhanced WM7110IMSE/R Standard Enhanced (tape and reel) WM7110IMH High Performance
WM7110IMH/R High Performance (tape and reel) WM7110IMHE High Performance Enhanced
WM7110IMHE/R High Performance Enhanced (tape and reel)
WM7110
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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.
CONDITION MIN MAX Supply Voltage
-0.3V +4.2V Operating temperature range, T A -40oC +85oC
Storage temperature prior to soldering 30°C max / 85% RH max
Storage temperature after soldering
-40oC +100oC
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN TYP MAX UNIT
Analogue Supply Range VDD 1.5 3.7 V Ground GND 0 V
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ACOUSTIC AND ELECTRICAL CHARACTERISTICS
STANDARD AND STANDARD ENHANCED
WM7110IMS, WM7110IMS/R, WM7110IMSE, WM7110IMSE/R
Test Conditions: VDD=2.1V, T A = 25°C
PARAMETER SYMBOL TEST CONDITIONS
MIN TYP MAX UNIT NOTE
Directivity Omni-directional Current Consumption I VDD 160 μA
Total Harmonic Distortion THD 1kHz 100dB SPL 0.5 %
-45 -42 -39 dB Standard Sensitivity
1kHz 94dB SPL
(0dB = 1V/Pa) -43 -42 -41 dB Enhanced Signal to Noise Ratio SNR A-Weighted 20Hz – 20kHz
55 59 dB
Power Supply Rejection Ratio PSRR 40 50 dB Output Impedance Z OUT 100 ? Accoustic Overload
THD < 10%
120
dB SPL
HIGH PERFORMANCE AND HIGH PERFORMANCE ENHANCED
WM7110IMH, WM7110IMH/R, WM7110IMHE, WM7110IMHE/R
Test Conditions: VDD=2.1V, T A = 25°C
PARAMETER SYMBOL TEST CONDITIONS
MIN TYP MAX UNIT NOTE
Directivity Omni-directional Current Consumption I VDD 160 μA
Total Harmonic Distortion
THD
1kHz 100dB SPL 0.5 %
-45 -42 -39 dB High Perf Sensitivity 1kHz 94dB SPL
(0dB = 1V/Pa) -43 -42 -41 dB Enhanced Signal to Noise Ratio SNR A-Weighted 20Hz – 20kHz
60 62 dB
Power Supply Rejection Ratio PSRR 40 50 dB Output Impedance Z OUT 100 ? Accoustic Overload
THD < 10%
120
dB SPL
TERMINOLOGY
1. Signal-to-Noise Ratio (dB) – SNR is a measure of the ratio between the sensitivity of the microphone to a 94dB SPL
sine wave and the A-Weighted analogue idle noise.
2. Total Harmonic Distortion (dB) – THD is the level of the rms value of the sum of harmonic distortion products relative to the amplitude of the applied sound pressure level.
3. Total Harmonic Distortion plus Noise (dB) – THD+N is the level of the rms value of the sum of harmonic distortion products plus noise in the specified bandwidth relative to the amplitude of the applied sound pressure level.
4.
All performance measurements carried out with 20kHz low pass filter, and where noted an A-weighted filter. Failure to use such a filter will result in higher THD and lower SNR readings than are found in the Acoustic and Electrical Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
WM7110
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APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
Figure 1 WM7110 Recommended External Components Notes: 1.
The value of C2 should be selected with reference to the input impedance of the analogue input the microphone is
connected to. C2 and the input impedance create a high pass filter, the value of C2 should be selected to pass the lowest frequency of audible interest.
CONNECTION TO A WOLFSON AUDIO CODEC
Wolfson has a range of audio CODEC’s, DAC’s and ADC’s with microphone input interfaces which support the direct connection of the WM7110. As an example, Figure 2 details the connection of the WM7110 to the WM8990 audio CODEC. The same principles can be applied to Wolfson devices which support microphone inputs. Further details on the WM8990 can be obtained form the Wolfson
website.
Figure 2 Connection of WM7110 to WM8990
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PACKAGE DIMENSIONS
D E F Dimensions (mm)Symbols
MIN
NOM MAX NOTE
A G H K 4.62 4.72 4.823.763.66 3.861.251.15 1.351.241.45 1.601.301.09 1.390.151.63 1.88 2.13I 1.17
1.37 1.57
0.940.890.99
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).
3. LID SHOULD BE PARALLEL TO THE SEATING PLANE ±50μm.
1 1.64
2
J L M
2.661.60
3.62Flat Area Flat Area
Gasket Area
WM7110
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RECOMMENDED CUSTOMER LAND PATTERNS
Figure 3 Recommended Customer PCB Land Pattern
Product Preview WM7110 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. 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 warranty. 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. Wolfson 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.
Wolfson’s 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 customer’s 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 party’s products or services does not constitute Wolfson’s approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner.
Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is
not liable for any unauthorised alteration of such information or for any reliance placed thereon.
Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in
this datasheet or in Wolfson’s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person’s own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person.
ADDRESS:
Wolfson Microelectronics plc
Westfield House
26 Westfield Road
Edinburgh
EH11 2QB
Tel :: +44 (0)131 272 7000
Fax :: +44 (0)131 272 7001
Email :: sales@https://www.wendangku.net/doc/371998036.html,
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