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w WM7211, WM7211e top port digital silicon microphone wolfson microelectronics plc pre-production, january 2014, rev 3.1 copyright ? 2014 wolfson microelectronics plc description the WM7211 is a low-profile silicon digital microphone. it offers high signal to noise ratio (snr) and low power consumption and is suited to a wide variety of consumer applications. the WM7211 incorporates wolfson?s proprietary cmos/mems membrane technology, offering high reliability and high performance in a miniature, low-profile package. the WM7211 is designed to withstand the high temperatures associated with automated flow solder assembly processes. (note that conventional microphones can be damaged by this process.) the WM7211 incorporates a high performance adc, which outputs a single-bit pu lse density modulated (pdm) audio data stream. the WM7211 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. the WM7211e variant offers a tighter tolerance on the microphone sensitivity, givi ng reduced variation between parts. this removes the need for in-line production calibration of part-to-part microphone variations. features high snr; selectable sensit ivity tolerance options - WM7211 ? snr 61db, sensitivity +/-3db - WM7211e ? snr 61db, sensitivity +/-1db ? low power - sleep mode - 2 a - normal operation - 735 a ? low profile packaging ? support for automated flow solder assembly ? pdm digital audio output ? stereo/array operation ? proprietary adc technology - reduced clock jitter sensitivity - low noise floor modulation - stable in overload condition ? top port package ? 1.64v to 3.7v supply ? 4.00 x 3.00 x 1.00mm thin package design applications ? mobile telephone handsets ? portable computers ? portable media players ? digital still cameras ? digital video cameras ? bluetooth headsets ? portable navigation devices block diagram
WM7211 pre-production w pp, rev 3.1, january 2014 2 table of contents descript ion ....................................................................................................... 1 ? featur es ............................................................................................................ 1 ? applications ..................................................................................................... 1 ? block diag ram ................................................................................................ 1 ? table of co ntents ......................................................................................... 2 ? pin config uration .......................................................................................... 3 ? pin descri ption ................................................................................................ 3 ? ordering info rmation .................................................................................. 3 ? absolute maximu m ratings ........................................................................ 4 ? important assembl y guidel ines .............................................................. 4 ? recommended operatin g condit ions ..................................................... 4 ? acoustic and electrical characteristi cs ......................................... 5 ? terminology ............................................................................................................... 5 ? audio interface timing ........................................................................................... 7 ? typical perfo rmance ................................................................................... 8 ? frequency response .............................................................................................. 8 ? thd ratio ..................................................................................................................... . 8 ? applications in formation .......................................................................... 9 ? recommended external components .............................................................. 9 ? optimised system rf design ................................................................................. 9 ? connection to a wolfs on audio codec .......................................................... 9 ? recommended pcb la nd patterns ................................................................... 10 ? package dimension s (lga ) ......................................................................... 11 ? important no tice ......................................................................................... 12 ? address: .......................................................................................................... 12 ? revision hi story ........................................................................................... 13 ?
pre-production WM7211 w pp, rev 3.1, january 2014 3 pin configuration pin description pin name type description 1 vdd supply supply 2 lrsel digital input channel select 0 = data output following falling clk edge 1 = data output following rising clk edge 3 clk digital input clock input 4 dat digital output pdm data output 5 gnd supply ground ordering information device description temperature range moisture sensitivity level peak soldering temperature WM7211ims/rv standard (tape and reel) -40 to +100 o c msl2a +260 o c WM7211imse/rv standard enhanced (tape and reel) -40 to +100 o c msl2a +260 o c note: reel quantity = 4800 all devices are pb-free and halogen free.
WM7211 pre-production w pp, rev 3.1, january 2014 4 absolute maximum ratings absolute maximum ratings are stress ratings only. permanent damage to the device may be caused by continuously operating at or beyond these limits. device functional operating limits and guaranteed performance specificati ons are given under electrical characteristics at the te st conditions specified. esd sensitive device. this device is manufactured on a cmos process. it is therefore generically susceptible to damage from excessive static voltages. proper esd precautions must be taken during handling and storage of this device. wolfson tests its package types according to ipc/jedec j-st d-020 for moisture sensitivity to determine acceptable storage conditions prior to surface mount assembly. these levels are: msl1 = unlimited floor life at <30 ? c / 85% relative humidity. not normally stored in moisture barrier bag. msl2 = out of bag storage for 1 year at <30 ? c / 60% relative humidity. supplied in moisture barrier bag. msl2a = out of bag storage for 4 weeks at <30c / 60% re lative humidity. supplied in moisture barrier bag. msl3 = out of bag storage for 168 hours at <30 ? c / 60% relative humidity. supplied in moisture barrier bag. the moisture sensitivity level for each package type is specif ied in ordering information. condition min max supply voltage (vdd) -0.3v +4.2v voltage range digital inputs (lrsel and clk) gnd-0.3v vdd+0.3v operating temperature range, t a -40oc +100oc storage temperature prior to soldering 30 ? c max / 60% rh max storage temperature after soldering -40oc +100oc important assembly guidelines do not put a vacuum over the port hole of the microphone. pl acing a vacuum over the port hole can damage the device. for information on recommended pick and place vacuum poi nt, refer to the package dimension drawing. do not board wash the microphone after a re-flow process. board washing and the associated cleaning agents can damage the device. do not expose to ultrasonic cleaning methods. do not use vapour phase re-flow proce ss. the vapour can damage the device. please refer to application note wan0273 (mems mic assemb ly and handling guidelines) for further assembly and handling guidelines. recommended operating conditions parameter symbol min typ max unit analogue supply range vdd 1.64 3.7 v ground gnd 0 v clock frequency f clk 1 3.25 mhz
pre-production WM7211 w pp, rev 3.1, january 2014 5 acoustic and electrical characteristics test conditions: vdd=1.8v, 1khz test signal, clk=2.4mhz, t a = 25c parameter symbol test conditions min typ max unit directivity omni-directional polarity (see note) positive sound pressure decreasing density of 1?s sensitivity (WM7211) s 94 db spl -29 -26 -23 dbfs sensitivity (WM7211e) s 94 db spl -27 -26 -25 dbfs acoustic overload thd < 10% 120 db spl signal to noise ratio snr a-weighted 61 db total harmonic distortion thd 100db spl input 0.1 1 % dynamic range dr a-weighted noise floor to 1% thd 84 db frequency response +3db high frequency 17000 hz acoustic noise floor a-weighted 33 db spl electrical noise floor a-weighted -87 dbfs power supply rejection psr 217hz square wave 100mv pk-pk -75 dbfs digital input / output clk input high level v ih 0.65 x vdd v clk input low level v il 0.35 x vdd v dat output high level v oh i oh = +1ma 0.9 x vdd v dat output low level v ol i ol = -1ma 0.1 x vdd v input capacitance (clk) c in 0.5 pf maximum load capacitance (dat) c load 100 pf input leakage 1 a short circuit output current i sc dat connected to gnd 10 ma miscellaneous current consumption i vdd active mode 735 a sleep mode 2 10 start-up time from off 10 ms from sleep 10 clk sleep frequency 1.0 khz note: the WM7211 generates a single-bit digital (pdm) output in response to the acoustic i nput. a positive sound pressure on the diaphragm generates a decreasing densit y of 1?s in the pdm stream (i.e. there is a phase inversion between the acoustic input and the digital output.)
WM7211 pre-production w pp, rev 3.1, january 2014 6 terminology 1. sensitivity (dbfs) ? sensitivity is a measure of the microphone output response to the ac oustic pressure of a 1khz 94db spl (1pa rms) sine wave. this is referenced to the output full scale range (fsr) of the microphone. 2. full scale range (fsr) - sensitivity, electrical noise floor and power supply rejection are measured with reference to the output full scale range (fsr) of the microphone. fsr is defined as the amplitude of a 1khz sine wave output whose positive peak value reaches 100% density of logic 1s and whose negativ e peak value reaches 0% density of logic 1s. this is the largest undistorted 1khz sine wave that will fit in the di gital output numerical range. note that, because the definition of fsr is based on a sine wave, it is possible to support a square wave test signal output whose level is +3dbfs. 3. signal-to-noise ratio (db) ? snr is a measure of the difference in level bet ween the output response of a 1khz 94db spl sine wave and the idle noise output. 4. total harmonic distortion (%) ? thd is the ratio of the rms sum of the harmonic distor tion products in the specified bandwidth (see note below) relative to the rms amplit ude of the fundamental (ie. test frequency) output. 5. dynamic range (db) ? dr is the ratio of the 1% thd microphone output level (in response to a sine wave input) and the idle noise output level. parameter validat ed in electroacoustic laboratory and not guaranteed. 6. all performance measurements are carried out with 20khz low pass ?brick-wall? filter and, where noted, an a-weighted filter. failure to use these filters will result in higher thd and lower snr values than are found in the acoustic and electrical characteristics. the bri ck wall filter removes out of band noise. 7. sleep mode is enabled when the clk input is below t he clk sleep frequency noted above. this is a power-saving mode. normal operation resumes automatically when the cl k input is above the clk sleep frequency. note that the vdd supply is still required in sleep mode.
pre-production WM7211 w pp, rev 3.1, january 2014 7 audio interface timing figure 1 digital microphone interface timing test conditions the following timing information is valid acro ss the full range of recommended operating conditions. parameter symbol min typ max unit digital microphone interface timing clk cycle time t cy 308 1000 ns clk duty cycle 60:40 40:60 dat enable from rising clk edge (lrsel = 1) t l_en 18 ns dat disable from falling clk edge (lrsel = 1) t l_dis 16 ns dat enable from falling clk edge (lrsel = 0) t r_en 18 ns dat disable from rising clk edge (lrsel = 0) t r_dis 16 ns notes: 1. the dat output is high-impedance when not outputting dat a; this enables the outputs of two microphones to be connected together, with the data from one microphone inte rleaved with the data from the other. (the microphones must be configured to transmit on opposite channels in this case.) 2. in a typical configuration, the le ft channel is transmitted following the rising clk edge (lrsel = 1). in this case, the left channel should be sampled by the re ceiving device on the falling clk edge, 3. similarly, the right channel is typi cally transmitted following the falling clk edge (lrsel = 0). in this case, the right channel should be sampled by the rece iving device on the rising clk edge.
WM7211 pre-production w pp, rev 3.1, january 2014 8 typical performance frequency response \ 11.0 \ 9.0 \ 7.0 \ 5.0 \ 3.0 \ 1.0 1.0 3.0 5.0 7.0 9.0 11.0 10 100 1000 10000 sensitivity (db) frequency (hz) sensitivity vs. frequency (relative to sensitivity @ 1khz) thd ratio
pre-production WM7211 w pp, rev 3.1, january 2014 9 applications information recommended external components it is recommended to connect a 0.1f decoupling c apacitor between the vdd and gnd pins of the WM7211. a ceramic 0.1f capacitor with x7r dielectr ic or better is suitable. the capacitor should be placed as close to the WM7211 as possible. optimised system rf design for optimised rf design please refer to document wan0278 (recommended pcb layout for microphone rf immunity in mobile cell phone applications) for further information. . connection to a wolfson audio codec wolfson provides a range of audio codecs incorpor ating a digital microphone input interface; these support direct connection to digita l microphones such as the WM7211. stereo connection of two WM7211 digital microphones to the wm8280 codec is illustrated in figure 2. a 0.1f decoupling capacitor is recommended; this should be positioned close to the vdd pin of the WM7211. a ceramic 0.1f capacitor with x7 r dielectric or better is suitable. further information on the wm8280 is provided in t he product datasheet, which is available from the wolfson website. the equivalent connections c an be made to other wolfson devices supporting a digital microphone interface. vdd vdd clk dat lrsel clk dat lrsel 0.1 f 0.1 f vdd vdd gnd gnd WM7211 WM7211 wm8280 dmicclkn dmicdatn figure 2 stereo WM7211 digital microphone connection to wm8280
WM7211 pre-production w pp, rev 3.1, january 2014 10 recommended pcb land patterns 1.30 2.30 figure 3 recommended customer pcb land pattern (note that all other dimensions can be obtained from the package dimensions)
pre-production WM7211 w pp, rev 3.1, january 2014 11 package dimensions (lga) a bottom view top view 0.10 c side view notes: 1. the seating plane is represented by primary datum -c- 2. the deviation from the seating plane due to warpage or twist is specified as max 50 ? m (flatness). 3. lid should be parallel to the seating plane 100 ? m. 4. interpret dim and tol per asme y14.5m - 1994 y u h f ms5: package 4.00 x 3.00 x 1.00 mm body pin1 corner f p v r w x symbols min nom max note a 1.00 d 4.00 e 3.00 f 0.10 1 0.50 2 1.26 dimensions (mm) dm096.e j 1.50 h 0.35 u 0.40 y 0.95 m 1.10 v w 0.45 x 0.40 d e j 1 2 0.1 a b 4x c 4x r0.40 gasket diameter 3 4 1 2 5 1.35 0.85 2.90 1.45 0.30 0.05 3.90 0.35 0.30 0.40 0.35 0.90 0.40 3.10 1.55 0.40 0.15 4.10 0.45 0.40 0.50 0.45 1.00 0.60 0.30 x 0.45 m pnp vacuum point r 0.40 0.35 0.45 p 0.40 0.35 0.45 0.90 1.10 0.35
WM7211 pre-production w pp, rev 3.1, january 2014 12 important notice wolfson microelectronics plc (?wol fson?) products and services are sold subject to wolfson?s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. wolfson warrants performance of its products to the specifications in effect at t he date of shipment. wolfson reserves the right to make changes to its products and s pecifications or to discontinue any produc t or service without notice. customers should therefore obtain the latest version of relevant informati on from wolfson to verify that the information is current. testing and other quality control techniques are utilised to the extent wolfson deems necessary to support its warranty. specific testing of all parameters of each device is not necessarily performed unless requi red by law or regulation. in order to minimise risks associated with customer app lications, the customer must use adequate design and operating safeguards to minimise inherent or proc edural hazards. wolfson is not liable fo r applications assistance or customer product design. the customer is solely responsible for its se lection and use of wolfson products . wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a wolfson product. wolfson?s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to re sult in personal injury, death or severe property or environmental damage. any use of products by the customer for such purposes is at the customer?s own risk. wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of wolfson covering or relating to any combination, machine, or pr ocess in which its products or services might be or are used. any prov ision or publication of any third party?s products or services does not constitute wolfson?s approval, licence, warranty or endorsement thereof. any third party trade marks contained in this document belong to the respective third party owner. reproduction of information from wolfson datasheets is per missible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other not ices (including this notice) and conditions. wolfson is not liable for any unauthorised alteration of such in formation or for any reliance placed thereon. any representations made, warranties giv en, and/or liabilities accepted by any pers on which differ from those contained in this datasheet or in wolfson?s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person?s own risk. wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. address: wolfson microelectronics plc westfield house 26 westfield road edinburgh eh11 2qb tel :: +44 (0)131 272 7000 fax :: +44 (0)131 272 7001 email :: sales@wolfsonmicro.com
pre-production WM7211 w pp, rev 3.1, january 2014 13 revision history date rev originator changes 31/01/11 2.0 pf first release 18/02/11 2.0 jmacd confidential added to headers and footers 26/04/11 2.1 kc updated the psrr, sleep mode, start up time from off updated frequency response curve and the +3db point to 17000hz updated the thd % updated all the lrsel description , and figure 1 added the notes on updated reel quantity 27/04/11 2.1 jmacd current consum ption / active mode changed to 650 a 02/05/11 2.2 jmacd package drawing updated. 20/12/11 2.3 kc introduced e variant with sensitivity +/-1db added e variant ordering info added voltage range digital input updated the codec to wm8994 added reference to wan_0273 19/01/12 2.3 jmacd package diagram updated to dm096c ? formatting updates. 23/08/12 2.4 jmacd package diagram updated to dm096d 16/05/13 2.5 jmacd package diagram updated to dm096e 08/11/13 3.1 jmacd product status updated to pre production updated codec reference to wm8280. 18/12/13 3.1 mr acoustic and electrical characteristics updated: polarity and note added.
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