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AN-000012

型号：	AN-000012
PDF文件：
功能描述：	Differential Analog Output MEMS Microphone Flex Evaluation Board
PDF文件大小：	212.81 Kbytes
PDF页数：	共4页
制造商：	TDK[TDK Electronics]
制造商LOGO：
制造商网址：	http://www.tdk.com

AN-000012

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AN‐000012

DifferentialAnalogOutputMEMSMicrophoneFlexEvaluationBoardUserGuide



InvenSensereservestherighttochangethedetail

specificationsasmayberequiredtopermit

improvementsinthedesignofitsproducts.

InvenSenseInc.

1745TechnologyDrive,SanJose,CA95110U.S.A

+1(408)988–7339

www.invensense.com



DocumentNumber:AN‐000012

Revision:1.2

Rev.Date:06/15/2016



GENERALDESCRIPTION

ThisuserguideappliestothefollowingMEMSmicrophone

evaluationboards:

 EV_ICS‐40618‐FX

 EV_ICS‐40619‐FX

 EV_ICS‐40720‐FX

Thisisasimpleevaluationboardthatallowquickevaluationof

the performance of differential output analog MEMS

microphones.Thesmallsizeandlowprofileoftheflexible

PCB

enablesdirectplacementofthemicrophoneintoaprototype

oranexistingdesignforaninsituevaluation.Theevaluation

board consists of a bottom port microphone soldered to a

flexiblePCBwithcolor‐codedwiresattached.Theonlyother

componentontheboardisa0.1μFsupply

bypasscapacitor.

Table1describesthefunctionsofthefourconnectionwires.

Table2 explainsthefunctional differences betweenthetwo

microphonesandevaluationboards.



TABLE1.PINFUNCTIONDESCRIPTIONS

WIRE

COLOR

MICROPHONE

PIN DESCRIPTION

Red VDD PowerSupply.1.5Vdcto3.6V

dc.

White OUTPUT+ AnalogOutputSignal+

Blue OUTPUT− AnalogOutputSignal−

Black GND Ground.



TABLE2.ICS‐40720SPECIFICATIONS

Microphone Sensitiv ity

Maximum

Output

Voltage

Output

Impedance

Mic Port

Location

ICS‐40618−38dBV 1.0Vrms 750Ω Bottom

ICS‐40619−38dBV 1.0Vrms 750Ω Top

ICS‐40720−32dBV 0.63V

rms

700Ω Bottom



EVALUATIONBOARDCIRCUIT

Figure 1 shows the schematic of the evaluation boards, and

Figures 2‐4 show the flex board layouts. See the respective

microphone data sheets for complete descriptions and

specificationsofthemicrophones.

Figure1.EvaluationBoardSchematic



Figure2.EV_ICS‐40618‐FXBoardLayout(TopView)



Figure3.EV_ICS‐40619‐FXBoardLayout(TopView)



Figure4.EV_ICS‐40720‐FXBoardLayout(TopView)



Figure5.DimensionsinMillimeters(WiresNotIncluded)

0.1µF

OUTPUT‐

GND

MICROPHONE

OUTPUT+

12.00

3.60

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