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omnidirectional microphone with bottom port and analog output data sheet admp401 rev. e information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and register ed trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2010 C 2012 analog devices, inc. all rights reserved. features 4.72 mm 3.76 mm 1.0 mm surface - mount package high snr of 62 dba s ensitivity of ? 42 dbv flat frequency response from 100 hz to 1 5 khz low current consumption of <25 0 a single - ended analog output high psr of 7 0 db compatible with sn/pb and pb -f ree solder processes rohs /weee compliant applications smart p hones and feature phones teleconferencing systems digital video c ameras bluetooth h eadsets video phones tablets functional block dia gram output amplifier admp401 power 07712-001 vdd gnd output figure 1. general descriptio n the admp401 1 is a high quality, high performance , low power , analog output , bottom - ported omnidirectional mems microphone. the admp401 consists of a mems micro phone element , an impedance converter, and an output amplifier. the admp401 sensitivity specification mak es it an excellent choice for both near field and far field applications. the admp401 has a high snr and flat wideband frequency response , resulting in natural sound with high intelligibility. low current consumption enables long battery life for portable applications. the admp401 complies with the tia - 920 standard , telecommunications telephone terminal equipment transmission requirements for wideband digital wireline telephones . the admp401 is available in a thin , 4.72 mm 3.76 mm 1.0 mm surface - mount package. it is reflow solder compatible with no sensitivity degradation . the admp401 is halide free . 1 protected by u.s. patents 7,449,356; 7,825,484; 7,885,423; 7,961,897. other patents are pending.
important links for the admp401 * last content update 09/20/2013 09:49 pm documentation an-1181: using a mems microphone in a 2-wire microphone circuit an-1165: op amps for mems microphone preamp circuits an-1140: microphone array beamforming an-1124: recommendations for sealing analog devices, inc., bottom- port mems microphones from dust and liquid ingress an-1112: microphone specifications explained an-1068: reflow soldering of the mems microphone an-1003: recommendations for mounting and connecting analog devices, inc., bottom-ported mems microphones introducing imems (r) microphones this video compares the admp401 analog mems and the admp421 digital mems with a bk type 4939 measurement microphone. ug-278: eval-admp401z-flex: bottom-ported analog output mems microphone evaluation board ug-126: eval-admp401z bottom-ported analog output mems microphone evaluation board ms-2472: analog and digital mems microphone design considerations ms-2275: common inter-ic digital interfaces for audio data transfer a history of consumer microphones: industrial ics solutions bulletin, volume 10, issue 8 industrial ics design tools, models, drivers & software microphone beamforming simulation tool (32-bit) - documentation for the microphone beamforming simulator microphone beamforming simulation tool (64-bit) - documentation for the microphone beamforming simulator product recommendations & reference designs cn-0262: low noise analog mems microphone and preamp with compression and noise gating cn-0207: high performance analog mems microphone's simple interface to sigmadsp audio codec evaluation kits & symbols & footprints mems microphone evaluation boards admp401z evaluation board admp401 flex evaluation board symbols and footprints parametric selection tables find similar products by operating parameters consider admp404: omnidirectional microphone with bottom port and analog output consider admp405: omnidirectional microphone with bottom port and analog output consider admp421: omnidirectional microphone with bottom port and analog output consider admp441: omnidirectional microphone with bottom port and analog output consider admp504: omnidirectional microphone with bottom port and analog output consider admp521: omnidirectional microphone with bottom port and analog output design collaboration community collaborate online with the adi support team and other designers about select adi products. follow us on twitter: www.twitter.com/adi_news like us on facebook: www.facebook.com/analogdevicesinc design support submit your support request here: linear and data converters embedded processing and dsp telephone our customer interaction centers toll free: americas: 1-800-262-5643 europe: 00800-266-822-82 china: 4006-100-006 india: 1800-419-0108 russia: 8-800-555-45-90 quality and reliability lead(pb)-free data sample & buy admp401 view price & packaging request evaluation board request samples check inventory & purchase find local distributors * this page was dynamically generated by analog devices, inc. and inserted into this data sheet. note: dynamic changes to the content on this page (labeled 'important links') does not constitute a change to the revision number of the product data sheet. this content may be frequently modified. powered by tcpdf (www.tcpdf.org)
admp401 data sheet rev. e | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ............................. 5 printed circuit board (pcb) land pattern layout ...................... 6 typical performance characteristics ............................................. 7 applications information ................................................................ 8 connecting the admp401 to a codec ......................................8 connecting the admp401 to an op amp gain stage ............8 supporting documents ................................................................8 handling instructions .......................................................................9 pick - and - place equipment ..........................................................9 reflow solder .................................................................................9 board wash ....................................................................................9 reliability specifications ................................................................ 10 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 revision hi story 7 /12 rev. d to rev. e changes to features section, general description section, and page 1 layout .................................................................................... 1 add note 1 ......................................................................................... 1 changes to frequency response parameter, table 1 and powers supply rejection parameter, table 1 .............................................. 3 changes t o temperature range parameter, table 2 ..................... 4 changes to figure 6, figure 7, and figure 8 .................................. 7 changes to applications information section and figure 10 ..... 8 added supporting documents section, application notes section, circuit notes section, and evaluation board us er guides section .................................................................................. 8 changes to thb description column, table 5 and temperature cycle column, table 5 ................................................................... 10 changes to ordering guide .......................................................... 11 1/1 2 rev. c to rev. d updated outline dimensions ....................................................... 11 changes to figure 12 ...................................................................... 11 added figure 13 .............................................................................. 11 change to ordering guide ................................ ............................ 11 8/11 rev. b to rev. c changes to figure 1 ........................................................................... 1 changes to table 3 ............................................................................. 4 removed terminal side down from figure 3 ............................... 5 changes to bullet 2 in pick - and - place equipment section ......... 9 changes to ordering guide .......................................................... 11 12/10 rev. a to rev. b changes to applications and general description sections ....... 1 changes to table 1 ............................................................................. 3 8 /10 rev . 0 to rev. a changes to frequency response parameter, table 1 .................... 3 changes to supply voltage parameter, table 2 .............................. 4 changes to applications information section, figure 9 , and figure 10 ............................................................................................. 8 updated outline dime nsions ....................................................... 11 4/ 10 revision 0 : initial versi on
data sheet admp401 rev. e | page 3 of 12 specifications t a = 25c, v dd = 1.8 v , unless otherwise noted. all minimum and maximum specifications are guaranteed. typical specifications are not guaranteed. table 1 . parameter sym bol test conditions /comments min typ max unit performance directionality omni sensitivity 1 khz, 94 db spl ?45 ? 42 ?39 dbv signal -to - noise ratio snr 62 dba equivalent input noise ein 32 dba spl dynamic range derived from ein and ma ximum acoustic input 88 db frequency response 1 low frequency, ?3 db point 60 hz high frequency, ?3 db point 15 khz deviation limits from flat response within pass band ? 3/+2 db total harmonic distortion thd 105 db spl 3 % power supply r ejection psr 217 hz, 100 mv p - p square wave superimposed on v dd = 1.8 v 70 db maximum acoustic input peak 120 db spl power supply supply voltage v dd 1.5 3. 3 v supply current i s 250 a output characteristics output impedance z ou t 200 output dc offset 0.8 v output current limit 90 a 1 see figure 6 and figure 7 .
admp401 data sheet rev. e | page 4 of 12 absolute maximum ratings table 2. parameter rating supply voltage ?0.3 v to + 3.6 v sound pressure level ( spl ) 160 db mechanical shock 1 0,000 g vibration per mil -std -883 m ethod 2007, test condition b temperature range ? 40c to + 85c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any o ther conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution 07712-002 t p t l t 25c t o peak t s prehe at critica l zone t l t o t p tempera ture time ramp-down ramp-up t smin t smax t p t l figure 2. recommended soldering profile limits table 3 . recommended soldering profile limits profile feature sn - pb pb free average ramp rate (t l to t p ) 1.25c/sec max imum 1.25c/sec max imum preheat minimum temperature (t smin ) 100c 100c maximum temperature (t smax ) 150c 200c time (t smin to t smax ), t s 60 sec to 75 sec 60 sec to 75 sec ramp - up rate (t smax to t l ) 1.25c/sec 1.25c/sec time maintained above liquidous (t l ) 45 sec to 75 sec ~50 sec liquidous temperature (t l ) 183c 2 17c peak temperature (t p ) 215c +3c/?3c 245c +0c/?5c time within 5c of actual peak temperature (t p ) 20 sec to 30 sec 20 sec to 30 sec ramp - down rate 3c/sec max imum 3c/sec max imum time 25c (t 25c ) to peak temperature 5 min max imum 5 min max imum
data sheet admp401 rev. e | page 5 of 12 pin configuration an d fu nction descriptions 07712-003 bottom view not to scale gnd output gnd v dd gnd gnd 3 1 2 4 5 6 figure 3. pin configuration (bottom view) table 4. pin function descriptions pin no. mnemonic description 1 output analog output signal 2 gnd ground 3 gnd ground 4 gnd ground 5 v dd power supply 6 gnd ground
admp401 data sheet rev. e | page 6 of 12 printed circuit b oard (pcb) land pattern layout the recommended pcb land pattern for the admp401 should have a 1:1 ratio to the solder pads on the microphone package, as shown in figure 4 . take c are to avoid applying solder paste to the sound hole in the pcb. a suggested solder paste stencil pattern layout is shown in figure 5 . the diameter of the sound hole in the pcb should be larger than the diameter of the sound port of the microphone. a minimum diameter of 0.5 mm is recommended. 2.62 ?1.10 ?1.68 ?0.70 (2) ?0.90 (3) 2.40 1.20 2.54 0.79 1.27 07712-004 figure 4 . pcb land pattern layout (dimensions shown in mm) 1.27mm 1.2mm 2.54mm 2.62mm 3.41mm 2.4mm 0.85mm dia. (3) 1.8mm/1.3mm dia. 0.2032 cut width (4) 0.649mm dia. (2) 07712-005 figure 5 . suggested solder paste stencil pattern layout
data sheet admp401 rev. e | page 7 of 12 typical performance characteristics 10 ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 50 100 10k frequenc y (hz) sensitivity (db) 1k 07712-006 figure 6 . frequency response mask 10 ?20 ?10 0 10 100 10k frequenc y (hz) amplitude (db) 1k 07712-007 figure 7 . typical frequency response (measured) 0 ?80 100 10k frequency (hz) psr (db) 1k ?10 ?20 ?30 ?40 ?50 ?60 ?70 07712-008 figure 8 . typical power supply rejection vs. frequency
admp401 data sheet rev. e | page 8 of 12 applications informa tion the admp401 output can be connected to a dedicated codec microphone input ( see figure 9 ) or to a high input i mpedance gain stage ( see figure 10 ). a 0.1 f ceramic capacitor placed close to the admp401 supply pin is used for testing and is recommended to adequately decouple the microphone from noise on the power supply. a dc - blocking capacitor is required at the output of the microphone . this capacitor creates a high - pass filter with a corner frequency at f c = 1/(2 c r ) where r is the input impedance of the codec. a minimum value of 2.2 f is recommended in figure 9 because the input impedance of the adau1361 / adau1761 can be as low as 2 k? at its highest pga gain setting, which results in a high - pass filter corner frequency at about 37 hz. figure 10 shows the admp401 connected to the ada4897 -1 op amp configured as a noninverting preamplifier. connecting the admp401 to a codec 07712-009 linn linp micbias adau1761 or adau1361 2.2f minimum v dd gnd admp401 output cm 0.1f figure 9. admp401 connected to the analog devices adau1761 or adau1361 codec connecting the admp401 to an op amp gain stage 1f minimum 10k? r 2 r 1 v ref ada4897-1 07712-010 v dd gain = (r 1 + r 2 )/r 1 gnd admp401 output 0.1f v o v ref figure 10 . admp401 connected to the ada4897 -1 op amp supporting docum ents application notes an - 1003, recommendations for mounting and connecting analog devices, inc., bottom - ported mems microphones an - 1068, reflow soldering of the mems microphone an - 1112, microphone specifications explained an - 1124, recommendations for sealing analog devices, inc., bottom - port mems microphones from dust and liquid ingress an - 1140, microphone array beamforming circuit notes cn - 0207, high performance analog mems microphones simple interface to sigmadsp audio codec cn - 0262, low noise analog mems microphone and preamp with compression and noise gating evaluation board user guides ug - 126, eva l - admp401z: bottom - ported analog output mems microphone evaluation board ug - 278, e val - admp401z - flex: bottom - ported analog output mems microphone evaluation board
data sheet admp401 rev. e | page 9 of 12 handling instruction s pick - and - place equipment the mems microphone can be handled u sing standard pick - and - place and chip shooting equipment. care should be taken to avoid damage to the mems microphone structure as follows: ? use a standard pickup tool to handle the microphone. because the microphone hole is on the bottom of the package, th e pickup tool can make contact with any part of the lid surface. ? use care during pick - and - place to ensure that no high shock events above 10 k g are experienced because such events may cause damage to the microphone. ? do not pick up the microphone with a va cuum tool that makes contact with the bottom side of the microphone. ? do not pull air out or blow air into the microphone port. ? do not use excessive force to place the microphone on the pcb . reflow solder for best results, the soldering profile should be in accordance with the recommendations of the manufacturer of the solder paste that is used to attach the mems microphone to the pcb. it is recommended that the solder reflow profile not exceed the limit conditions specified in fig ure 2 and table 3 . board wash when washing the pcb, ensure that water does not make contact with the microphone port. blow - off procedures and ultrasonic cleaning must not be used.
admp401 data sheet rev. e | page 10 of 12 reliability specific ations the microphone sensi tivity after stress must deviate by no more than 3 db from the initial value. table 5 . stress test description low temperature operating life ?40c, 500 hours, powered high temperature operating life +125c, 500 hours, powered thb +8 5c/85% relative humidity, 500 hours, powered temperature cycle ?40c/+125c, one cycle per hour, 1 00 0 cycles high temperature storage + 150c, 500 hours low tem perature storage ?40c, 500 hours component cdm esd all pins, 0.5 kv component hbm esd all pins, 1.5 kv component mm esd all pins, 0.2 kv
data sheet admp401 rev. e | page 11 of 12 outline dimensions 3.86 3.76 3.66 4.82 4.72 4.62 bot t om view top view side view 0.90 dia. (pins 1, 5, 6) 1 3 2 4 5 6 2.62 bsc 3.30 ref 1.10 dia. 1.68 dia. 0.25 dia. (thru hole) 0.79 bsc 2.54 bsc 1.27 bsc 1.10 1.00 0.90 0.24 ref 0.73 ref 1.20 bsc 2.40 bsc 0.68 ref 0.61 ref 0.70 dia. (pins 2, 4) 12-12-20 1 1-c 3.14 ref 4.10 ref reference corner pin 1 figure 11 . 6- terminal chip array small outline no lead cavity [lga _cav] 4.72 mm 3.76 mm body (ce -6- 1) dimensions shown in millimeters pin 1 direction of feed 07712-011 figure 12 . microphone orientation in tape until date code 1213 07712-012 pin 1 direction of feed figure 13 . microphone orientation in tape starting with date code 12 13 ordering guide model 1 temperature range package description package option 2 ordering quantity admp401acez - rl ?40c to + 85c 6- terminal lga_cav, 13 tape and reel ce -6-1 4, 5 00 admp401 acez - rl7 ?40c to + 85 c 6 - terminal lga_cav , 7 tape and reel ce - 6 - 1 1,000 eval - admp401 z evaluation board eval - admp401z - flex evaluation board 1 z = rohs compliant part. 2 the ce -6- 1 package option is halide free.
admp401 data sheet rev. e | page 12 of 12 notes ? 2010 C 2012 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d07712 -0- 7 /12(e)

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