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omnidirectional microphone with bottom port and analog output preliminary technical data ADMP405 rev. prh 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 i s 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: 781.329.4 700 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 2 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/pb 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 ADMP405 is a high quality, low cost, low power , analog output bottom - ported omnidirectional mems microphone. the ADMP405 consists of a mems microphone element , an impedance converter , and an output amplifier. the ADMP405 sensitivity specifi cation makes it an excellent choice for both near field and far field applications. the ADMP405 has a high snr and flat , wideband frequency response , resulting in natural sound with high intelligibility. the specially designed low - frequency cutoff reduces wind noise. low current consumption enables long battery life for portable applications. a built - in particle filter provides high reliability. the ADMP405 complies with the tia - 920 telecommunications telephone terminal equipment transmission requirements f or wideband digital wireline telephones standard. the ADMP405 is available in a n ultraminiature 3.35 mm 2.5 0 mm 0.88 mm surface - mount package . it is reflow solder compatible with no sensitivity degradation . the ADMP405 is halide free. functional block dia gram figure 1. asic v dd output gnd mems membrane backplate impedance converter output amplifier ADMP405 08616-001
ADMP405 preliminary technical data rev. prh | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagram .............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caut ion .................................................................................. 4 pin configuration and function descriptions ............................. 5 typical performance characteristics ............................................. 6 applications information ................................................................ 7 connecti ng the ADMP405 to a codec ......................................7 connecting the ADMP405 to an op amp gain stage ............7 pcb land pattern layout .................................................................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
preliminary technical data admp 405 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 2 00 hz high frequency C 3 db point 15 khz deviation from flat response within pass band ?3 +2 db total 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 current 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 .
ADMP405 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 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 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 temperature (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 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
preliminary technical data admp 405 rev. prh | page 5 of 12 pin configuration an d function descripti ons 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 . gnd output top view (terminal side down) not to scale admp404 1 v dd 3 2 08616-003
ADMP405 preliminary technical data rev. prh | page 6 of 12 typical performance characteristics figure 4 . frequency response mask figure 5 . typical power supply rejection ratio vs. frequency figure 6 . typical frequency response (measured) ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 10 100 10k 1k frequency (hz) sensitivity (db) 08488-004 0 ?80 100 10k frequency (hz) psrr (db) 1k ?10 ?20 ?30 ?40 ?50 ?60 ?70 08616-005 10 ?20 100 frequency (hz) (db) 1k 10k 0 ?10 08488-006
preliminary technical data admp 405 rev. prh | page 7 of 12 applications informa tion the ADMP405 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 ceramic capacitor (c1) at v dd placed close to the ADMP405 supply pins is u sed 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 ADMP405 to a codec figure 7. ADMP405 connected to the analog devices adau1761 codec connecting the ADMP405 to an op amp gain stage figure 8. ADMP405 connected to the op177 op amp adau1761 admp404 mic input + + c2 1f c1 0.1f gnd gnd gnd v dd output 08616-020 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
ADMP405 preliminary technical data rev. prh | page 8 of 12 pcb land pattern lay out the recommended pcb land pattern for the ADMP405 should be laid out to a 1:1 ratio to the solder pads on the microphone pack age, 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 l ayout 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 minimu m diameter of 0.5 mm is recommended. figure 9 . pcb land pattern layout figure 10 . suggested solder paste stencil pattern layout 08616-007 ?1.55 ?0.95 1.52 0.90 1.90 1.22 0.68 0.61 0.61 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)
preliminary technical data admp 405 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 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. ? 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 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 2 and table 3 . board wash when washing the pcb, ensure that water does not make conta ct with the microphone port. blow - off procedures and ultrasonic cleaning must not be used.
ADMP405 preliminary technical da ta 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. table 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 p405 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 it y ad m p 40 5 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 40 5 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 40 5 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 40 5 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
ADMP405 preliminary technical da ta 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. pr09027 - 0 - 4/10(prh)

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