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high spl microphone with bottom port and analog output data sheet ADMP411 rev. 0 document feedback 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 registered 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 ?2013 analog devices, inc. all rights reserved. technical support www.analog.com features 4.72 mm 3.76 mm 1.0 mm surface mount package 131 db spl acoustic overload point sensitivity of ?46 dbv 2 db sensitivity tolerance omnidirectional response high snr of 62 dba extended frequency response from 28 hz to 20 khz low current consumption: <250 a single-ended analog output high psr of ?80 dbv compatible with sn/pb and pb-free solder processes rohs/weee compliant applications fire and safety radios safety masks smartphones and feature phones tablet computers teleconferencing systems digital still and video cameras studio microphones bluetooth headsets security and surveillance functional block diagram figure 1. figure 2. isometric views of microphone package general description the ADMP411 1 is a high performance, high spl, low noise, low power, analog output bottom ported, omnidirectional mems microphone. the ADMP411 consists of a mems microphone element and an impedance converter amplifier. the ADMP411 sensitivity specification makes it an excellent choice for both near field and far field applications. the ADMP411 is pin compatible with the admp401 microphone, providing an easy upgrade path. the ADMP411 has a linear response up to 131 db spl. it offers high snr and extended wideband frequency response resulting in natural sound with high intelligibility. low current consump- tion enables long battery life for portable applications. the ADMP411 is available in a miniature 4.72 mm 3.76 mm 1.0 mm surface-mount package. it is reflow solder compatible with no sensitivity degradation. 1 protected by u.s. patents 7,449,356; 7,825,484; 7,885,423; 7,961,897. other patents are pending. output amplifier ADMP411 power v dd gnd output 10913-001 10913-002
ADMP411 data sheet rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 functional block diagram .............................................................. 1 gene ral description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descripti ons ............................. 5 typical performance characteristics ............................................. 6 applications information ................................................................ 7 codec connections .......................................................................7 dynamic rang e considerations ..................................................7 supporting documents ................................................................7 handling instructions .......................................................................8 pick and place equipment ............................................................8 reflow solder .................................................................................8 board wash ....................................................................................8 pcb land pattern layout .................................................................9 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 4 /1 3 revision 0: initial version
d ata sheet ADMP411 rev. 0 | 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 test conditions/comments min typ max unit performance directionality omni sensitivity 1 khz, 94 db spl ?48 ? 46 ?44 dbv signal - to - noise ratio (snr) 20 hz to 20 khz, a - weighted 62 dba equivalent input noise (ein) 20 hz to 20 khz, a - weighted 32 dba spl dynamic range derived from ein and maximum acoustic input 99 db frequency response 1 low frequency ?3 db point 28 hz high frequency ?3 db point >20 khz total harmonic distortion (thd) 10 5 db spl 0.2 1 % power supply rejection (psr) 217 hz, 100 mv p - p square wave superimposed on v dd = 1.8 v ?80 dbv power supply rejection ratio (psrr) 1 khz, 100 mv p -p sine wave superimposed on v dd = 1.8 v ? 46 db acoustic overload point 10% thd 13 1 db spl power supply supply voltage (v dd ) 1.5 3. 63 v supply current (i s ) v dd = 1.8 v 180 22 0 a v dd = 3.3 v 210 250 a output characteristics output impedance (z out ) 200 output dc offset 0.8 v maximum output voltage 13 1 db spl input 0.355 v rms noise floor 20 hz to 20 khz, a - weighted, rms ? 10 8 dbv 1 see figure 5 and figure 6 .
ADMP411 data sheet rev. 0 | page 4 of 12 absolute maximum rat ings table 2 . parameter rating supply voltage ? 0.3 v to + 3.6 3 v sound pressure level (spl) 160 db mechanical shock 1 0,000 g vibration per mil - std -883 m ethod 2007, test condition b storage temperature range ? 40c to +150c operating 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 other 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 figure 3. recommended soldering profile limits table 3 . recommended soldering profile limits profile feature sn63/pb37 pb - free average ramp rate (t l to t p ) 1.25 c/sec max imum 1.25c/sec max imum preheat minimum temperature (t smin ) 100c 150c 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 ) 1.25 c/sec 1.25c/sec time maintained above liquidous (t l ) 45 sec to 75 sec ~ 50 sec liquidous temperature (t l ) 183c 217c peak temperature (t p ) 215 c + 3c/?3 c 260 c + 0c/?5c time within 5c of actual peak temperature (t p ) 20 sec to 30 sec 20 sec to 30 sec ramp - down rate 3 c/sec max imum 3 c/sec max imum time 25c to peak temperature 5 minute max imum 5 minute max imum t p t l t 25c to peak t s preheat critical zone t l to t p temperature time ramp-down ramp-up t smin t smax t p t l 10913-003
d ata sheet ADMP411 rev. 0 | page 5 of 12 pin configuration and function descripti ons figure 4. pin configuration 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 bottom view (not to scale) gnd output gnd v dd gnd gnd 3 1 2 4 5 6 10913-004
ADMP411 data sheet rev. 0 | page 6 of 12 typical performance characteristics figure 5 . frequency response mask figure 6. typical frequency response (measured) figure 7. typical power supply rejection ratio vs. frequency figure 8. thd + n vs. input level figure 9. linearity figure 10 . clipping characteristics 20 15 10 5 0 ?10 ?5 10 100 1k 10k 20k normalized amplitude (db) frequency (hz) 10913-005 15 ?15 ?10 ?5 0 5 10 10 10k frequency (hz) normalized frequency response (dbv) 1k 100 10913-007 ?40 ?50 ?49 ?48 ?47 ?46 ?45 ?44 ?43 ?42 ?41 100 10k frequency (hz) psrr (db) 1k 10913-006 0.1 1 10 90 140 130 120 110 100 amplitude (db spl) thd + n (%) 10913-008 ?60 ?50 ?40 ?30 ?20 ?10 0 90 140 130 120 110 100 input amplitude (db spl) output amplitude (dbv) 10913-009 1.2 0 0.2 0.4 0.6 0.8 1.0 0 1.0 0.8 0.6 0.4 0.2 time (ms) output (v) 10913-014 128db spl 130db spl 132db spl 134db spl 136db spl 138db spl 140db spl
d ata sheet ADMP411 rev. 0 | page 7 of 12 applications informa tion codec connections the ADMP411 output can be connected to a dedicated codec microphone input (see figure 11 ) or to a high input impedance gain stage (see figure 12 ). a 0.1 f ceramic capacitor placed close to the ADMP411 supply pin i s used for testing and is recom mended to adequately decouple the microphone from noise on the power supply. a dc blocking capacitor is required at the output of the micro phone. this capacitor create s 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 4.7 f is recommended in figure 11 because the adau1761 / adau1361 input impedance can be as lo w as 2 k at its highest pga gain setting, which result s in a high- pass filter corner frequency at 1 7 hz. fig ure 12 shows the ADMP411 connected to a n ada4075 -2 op amp configured as a noninverting pre amp lifier . the an - 1165 application note describes using op amps for microphone preamp circuits and includes a list of recommended analog devices , inc., op amps. figure 11 . ADMP411 connected to the analog devices adau1761 or adau1361 codec figure 12 . ADMP411 connected to the ada4075 -2 op amp dynamic range consid era tions to fully utilize the 9 9 db dynamic range of the ADMP411 in a design, the preamp, adc, or codec circuit following it must be chosen carefully. for example, the adau1761 has a 98 db dynamic range with v dd = 3.3 v. to m atch the dynamic ranges between the microphone and the adc input of the codec, s ome gain must be added to the ADMP411 output. for example, a t the 1 31 db spl maximum acoustic input, the ADMP411 output s a ? 13 dbv rm s signal. the full - scale input voltage of the adau1761 adc is 0 dbv ; therefore, 13 db of gain must be added to the signal to match the dynamic range of the microphone with the dynamic range of the codec. supporting document s evaluation board user guide ug - 445, eva l - ADMP411z - flex: bottom - ported analog output mems microphone evaluation board 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, r ecommendations for sealing analog devices, inc., b ottom - port mems microphones from dust and liquid ingress an - 1140, microphone array beamforming an - 1165, op amps for mems microphone preamp circuits an - 1181, using a mems microphone in a 2 - wire microphone circuit adau1761 or adau1361 ADMP411 v dd gnd output linn linp micbias cm 4.7f minimum 0.1f 10913-010 gain = (r1 + r2)/r1 ADMP411 gnd output 1f minimum 0.1f 10k? r1 r2 v dd v ref v out v ref ada4075-2 1.8v to 3.3v 10913-0 11
ADMP411 data sheet rev. 0 | page 8 of 12 handling instruction s pick and place equip ment the mems microphone can be handled using standard pick and place and chip shoot ing equipment. take c are 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, the pickup tool can make contact with any part of the lid surface. ? do not pick up the microphone with a vacuum tool that makes contact with t he 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 used to attach the mems microphone to the pcb. it is recommended that the solder reflow profile not exceed the limit conditions specified in figure 3 and table 3 . for more detailed recommendations, see the an - 1068 application note , reflow soldering of the mems microphone . board wash when washing the pcb, ensure that water does not make contact with the microphone port. blowoff procedures and ultras onic cleaning must not be used.
data sheet ADMP411 rev. 0 | page 9 of 12 pcb land pattern layout the recommended pcb land pattern for the ADMP411 is la id out to a 1:1 ratio to the solder pads on the microphone package, as shown in figure 13 . 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 14 . 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. figure 13 . pcb land pattern layout (dimensions shown in millimeters ) figure 14 . suggested solder paste stencil pattern layout 2.62 ?1.10 ?1.68 ?0.70 (2) ?0.90 (3) 2.40 1.20 2.54 0.79 1.27 10913-012 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) 10913-013
ADMP411 data sheet rev. 0 | page 10 of 12 outline dimensions figure 15 . 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 ordering guide model 1 temperature range package description package option ordering quantity ADMP411 acez -rl ? 40c to + 85c 6- terminal lga_cav, 13 tape and reel ce -6-1 4,5 00 ADMP411acez -rl7 ? 40c to +85c 6- terminal lga_cav, 7 tape and reel ce -6-1 1 ,000 eval - ADMP411z - flex flex evaluation board 1 z = rohs compliant part. 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
data sheet ADMP411 rev. 0 | page 11 of 12 notes
ADMP411 data sheet rev. 0 | page 12 of 12 notes ? 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d10913 -0- 4 /13(0) ? 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d10913 -0- 4/13(0)

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