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omnidirectional microphone with bottom port and analog output preliminary technical data ADMP404 rev. prh i nformation furnished by ana log 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 w ithout 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 www.analog.com fax: 781.461.3113 ? 2010 analog devices, inc. all rights reserved. features tiny 3.35 mm 2.5 0 mm 0.88 mm surface - mount package high snr of 62 dba high s ensitivity of ? 3 8 dbv flat frequency response from 1 0 0 hz to 1 5 khz low current consumption: <25 0 a single - ended analog output high psrr of 7 0 db compatible with sn/p b and pb - free solder processes rohs/weee compliant applications smart p hones and feature phones digital video c ameras bluetooth h eadsets video phones teleconferencing systems general description the ADMP404 is a high quality, low cost, low power , analog o utput bottom - ported omnidirectional mems microphone. the ADMP404 consists of a mems microphone element , an impedance converter , and an output amplifier. the ADMP404 sensitivity specification makes it an excellent choice for both near field and far field ap plications. the ADMP404 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. a built - in particle filter provides high reliab ility. the ADMP404 complies with the tia - 920 telecommunications telephone terminal equipment transmission requirements for wideband digital wireline telephones standard. the ADMP404 is available in a n ultraminiature 3.35 mm 2.5 0 mm 0.88 mm surface - mou nt package . it is reflow solder compatible with no sensitivity degradation . the ADMP404 is halide free. functional block dia gram asic v dd output gnd mems membrane backplate impedance converter output amplifier ADMP404 08616-001 figure 1.
ADMP404 preliminary technical data rev. prh | page 2 of 12 table of contents featu res .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diag ram .............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratin gs ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ............................. 5 typical performance characteristics ............................................. 6 applications information ................................................................ 7 connecting the ADMP404 to a codec .......................................7 connecting the ADMP404 to an op amp gain stage .............7 pcb land pattern layout .................................................................8 handling instru ctions .......................................................................9 pick and place equipment ...........................................................9 reflow solder .................................................................................9 board wash ....................................................................................9 reliability specifications ................................................................ 10 outline dimensions ........................................................................ 11 ordering gu ide ........................................................................... 11 revision hi story
preliminary technical data ADMP404 rev. prh | 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 symbol test conditions /comments min typ max unit performance directionality omni sensitivity 1 khz, 94 db spl ? 4 1 ? 3 8 ? 3 5 dbv signal -to - noise ratio snr 6 2 dba equivalent input noise ein 32 dba spl frequency response 1 low frequency C 3 db point 1 00 hz high frequency C 3 db point 15 khz deviation from flat response within pass band ?3 +2 db to tal harmonic distortion thd 105 db spl 3 % power supply rejection ratio psrr 217 hz, 100 mv p - p square wave superimposed on v dd = 1.8 v 70 db max imum acoustic input peak 120 db spl power supply supply voltage v dd 1. 5 3.6 v supply cur rent i s 250 a output characteristics output impedance z out 200 output dc offset 0.8 v output current limit 90 a polarity noninverting 2 1 see figure 4 and figure 6 . 2 positive going (increasing) pressu re on the membrane results in a positive going (increasing) output voltage .
ADMP404 preliminary technical data rev. prh | page 4 of 12 absolute maximum rat ings table 2 . parameter rating supply voltage 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 + 70c 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 devic e 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 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 08616-002 figure 2. recommended soldering profile limits table 3 . recommended soldering profile limits profile feature sn63/pb37 pb - free average ramp rate (t l to t p ) 3c/sec max 3c/sec max preheat minimum temperature (t smin ) 100c 150c maximum temperature (t smax ) 150c 200c time (t smin to t smax ), t s 60 sec to 120 sec 60 sec to 120 sec ramp - up rate (t smax to t l ) 3c/sec 3c/sec time maintained above liquidous (t l ) 60 sec to 150 sec 60 sec to 150 sec liquidous temperatur e (t l ) 183c 217c peak temperature (t p ) 240c + 0c/ ?5c 260c + 0c/ ?5c time within 5c of actual peak temperature (t p ) 10 sec to 30 sec 20 sec to 40 sec ramp - down rate 6c/sec max 6c/sec max time 25c (t25c) to peak temperature 6 minute max 8 minute max
preliminary technical data ADMP404 rev. prh | page 5 of 12 pin configuration an d function descriptions gnd output top view (terminal side down) not to scale ADMP404 1 v dd 3 2 08616-003 figure 3. pin configuration table 4 . pin function descriptions pin no. mnemonic description 1 output analog output signal. 2 gnd ground . 3 v dd power supply .
ADMP404 preliminar y technical data rev. prh | page 6 of 12 typical performance chara cteristics 10 ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 100 10k frequency (hz) sensitivity (db) 1k 08616-009 figure 4 . frequency response mask 0 ?80 100 10k frequency (hz) psrr (db) 1k ?10 ?20 ?30 ?40 ?50 ?60 ?70 08616-005 figure 5 . typical power supply rejection ratio vs. frequency 10 ?20 ?10 0 100 10k frequency (hz) (db) 1k 08616-010 figure 6 . typical frequency response (measured)
preliminary technical data ADMP404 rev. prh | page 7 of 12 applications information the ADMP404 output can be connected to a dedicated codec microphone input (see figure 7 ) or to a high input impedance gain stage (see figure 8 ). a 0.1 f cera mic capacitor (c1) at v dd placed close to the ADMP404 supply pins is used for testing and is recommended to adequately decouple the microphone from noise on the power supply. a 1 f or larger dc - blocking tantalum capacitor (c2) is required at the output of the microphone. connecting the admp4 04 to a codec adau1761 ADMP404 mic input + + c2 1f c1 0.1f gnd gnd gnd v dd output 08616-020 figure 7 . ADMP404 connected to the analog devices adau1761 codec connecting the admp4 0 4 to an op amp gain stage 08616-021 ADMP404 + r1 10k? r3 r2 gnd gnd output 3 2 4 7 6 gnd v dd u1 op177 gain = (r2 + r3)/r3 c2 1f c1 0.1f figure 8 . ADMP404 connected to the op177 op amp
ADMP404 preliminar y technical data rev. prh | page 8 of 12 pcb land pattern lay out the recommended pcb land pattern for the ADMP404 should be laid out to a 1:1 ratio to the solder pads on the microphone package , as shown in figure 9 . care should be taken to avoid applying solder paste to the sound hole in the pcb. a suggested solder paste stencil pattern layout is shown in figure 10 . 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. 08616-007 ?1.55 ?0.95 1.52 0.90 1.90 1.22 0.68 0.61 0.61 figure 9 . pcb land pattern layout 08616-008 1.22 2 0.8 0.6 0.2 45 typ 1.52mm 1.55/1.05 dia. 0.225 cut width (2) figure 10 . suggested solder paste stencil pattern layout
preliminary technical data ADMP404 rev. prh | page 9 of 12 handling instruction s pick and place equip ment the mems microphone can be handled using standard pick - and - place and chip shooting equipment. care should be taken to avoid damage to the mems micropho ne 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. ? use care during pick - and - place to ensure that no high shock events above 20 k g are experienced because such events may cause damage to the microphone. ? do not pick up the microphone with a vacuum tool that makes contact with the bottom side of the microphone. do not pull air out of or blow air into the m icrophone 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 micropho ne to the pcb. it is recommended that the solder reflow profile not exceed the limit conditions specified in figure 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.
ADMP404 preliminary technical data rev. prh | page 10 of 12 reliability specific ations the microphone sensitivity after stress must deviate by no more than 3 db from the initial value. tab le 5 . stress test description low temperature operating life ?40c, 500 hours, powered high temperature operating life +125c, 500 hours, powered thb + 65c/85% relative humidity (rh), 500 hours, powered temperature cycle ?40c/ +125c, one cycle per hours, 1 00 cycles high temperature storage + 150c, 500 hours low temperature 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
pr el i m i nar y t ech ni ca l d at a adm p404 r e v . p r h | p a g e 1 1 o f 1 2 ou tl i ne di m ensi o ns f i g u re 11 . 3- t e r m i n al c h i p a rr ay sm a ll o u t li n e n o l e a d c av i ty [ l g a_ c av ] 3. 35 mm 2. 50 mm b od y (c e - 3- 2) di m e n si on s sh ow n i n m illi m e t er s or de r i n g gu i de m o d e l 1 t e m p e r a t u r e r a n g e p a c k a g e d e s c r i p t i o n p a c k a g e o p ti o n o r de r i n g qu a nt i t y ad m p 404 a c e z ? 40 c t o + 70 c 3 - t er m i n a l l g a _c a v c e -3 -2 2 1 ad m p 404 a c e z - r l ? 40 c t o + 70 c 3 - t er m i n a l l g a _c a v , 13 ? t a p e a n d r ee l c e -3 -2 2 10 , 0 0 0 ad m p 404 a c e z - rl 7 ? 40 c t o + 70 c 3 - t er m i n a l l g a _c a v , 7 ? t a p e a n d r ee l c e -3 -2 2 1 , 000 e v al - ad m p 404 z e va l u a t i o n b oa r d 1 z = r o hs co m p l i a n t p a r t . 2 t hi s p a c k a g e o p t i o n i s ha l i d e f r ee . 2.575 2.500 2.425 3.425 3.350 3.275 03-12-2010-a top view side view reference corner 0.98 0.88 0.78 0.21 ref 2.21 ref 3.06 ref 0.65 ref bott om view 1.08 0.95 dia. 0.25 nom 0.20 min dia. thru hole (sound port) 1.22 bsc 1.25 0.54 ref 0.64 ref 1.56 dia. 1.52 0.75 ref 0.30 bsc 1 3 2 0.90 0.68 (pins 1, 3) 0.20 typ 45 0.30 bsc
ADMP404 preliminary technical data rev. prh | page 12 of 12 notes ? 2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. p r09027 - 0 - 4/10(prh)

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