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WM7110 Rev1.4

WM7110 Rev1.4
WM7110 Rev1.4

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)

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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.

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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

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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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