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w wm7230, wm7230e bottom port digital silicon microphone wolfson microelectronics plc preliminary technical data, october 2012, rev 2.4 copyright ? 2012 wolfson microelectronics plc description the wm7230 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 wm7230 incorporates wolfson?s proprietary cmos/mems membrane technology, offering high reliability and high performance in a miniature, low-profile package. the wm7230 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 wm7230 incorporates a high performance adc, which outputs a single-bit pulse density modulated (pdm) audio data stream. the wm7230 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. the wm7230e variant offers a tighter tolerance on the microphone sensitivity, giving reduced variation between parts. this removes the need for in-line production calibration of part-to-part microphone variations. features ? high snr; selectable sensitivity tolerance options - wm7230 ? snr 61db, sensitivity +/-3db - wm7230e ? snr 61db, sensitivity +/-1db ? low power - sleep mode - 2 a - normal operation - 700 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 ? bottom port package ? 1.64v to 3.7v supply ? 4.00 mm x 3.00 mm 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 wm7230 amp transducer (cmos mems) vdd dat charge pump gnd adc control clk lrsel
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 2 table of contents description ....................................................................................................... 1 ? features ............................................................................................................ 1 ? applications ..................................................................................................... 1 ? block diagram ................................................................................................ 1 ? table of contents ......................................................................................... 2 ? pin configuration .......................................................................................... 3 ? pin description ................................................................................................ 3 ? ordering information .................................................................................. 3 ? absolute maximum ratings ........................................................................ 4 ? important assembly guidelines .............................................................. 4 ? recommended operating conditions ..................................................... 4 ? acoustic and electrical characteristics ......................................... 5 ? terminology ............................................................................................................... 5 ? audio interface timing ........................................................................................... 6 ? typical performance ................................................................................... 7 ? frequency response .............................................................................................. 7 ? thd ratio ..................................................................................................................... . 7 ? applications information .......................................................................... 8 ? recommended external components .............................................................. 8 ? optimised system rf design ................................................................................. 8 ? connection to a wolfson audio codec .......................................................... 8 ? recommended pcb land patterns ..................................................................... 9 ? package dimensions (lga) ......................................................................... 10 ? important notice ......................................................................................... 11 ? address: ..................................................................................................................... 11 ? revision history ........................................................................................... 12 ?
preliminary technical data wm7230 w ptd, rev 2.4, october 2012 3 pin configuration pin description pin name type description 1 clk digital input clock input 2 dat digital output pdm data output 3 vdd supply power supply 4 gnd supply ground 5 lrsel digital input channel select 0 = data output following falling clk edge 1 = data output following rising clk edge ordering information device description temperature range moisture sensitivity level peak soldering temperature wm7230ims/v standard -40 to +100 o c msl2a +260 o c wm7230ims/rv standard (tape and reel) -40 to +100 o c msl2a +260 o c wm7230imse/v standard enhanced -40 to +100 o c msl2a +260 o c wm7230imse/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.
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 4 absolute maximum ratings absolute maximum ratings are stress ratings only. perm anent damage to the device may be caused by continuously operating at or beyond these limits. device functional operating limits and guar anteed performance specifications are given under electrical characteristics at the test 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- std-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% relative 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 specified 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. placing a vacuum over the port hole can damage the device. 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 process. the vapour can damage the device. please refer to application note wan0273 (mems mic assembly and handling guidelines) for further assembly and handling guidelines. recommended operating conditions parameter symbol min typ max unit digital supply range vdd 1.64 3.7 v ground gnd 0 v clock frequency f clk 1 3.25 mhz
preliminary technical data wm7230 w ptd, rev 2.4, october 2012 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 sensitivity (wm7230) s 94 db spl -29 -26 -23 dbfs sensitivity (wm7230e) 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 0.1 1 % dynamic range dr a-weighted noise floor to 1% thd 85 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 -70 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 700 a sleep mode 2 10 start-up time from off 10 ms from sleep 10 clk sleep frequency 1.0 khz terminology 1. sensitivity (dbfs) ? sensitivity is a measure of the microphone output response to the acoustic 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 negative peak value reaches 0% density of logic 1s. this is the largest undistorted 1khz sine wave that will fit in the digital 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 between 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 rm s sum of the harmonic distortion products in the specified bandwidth (see note below) relative to the rms amplitude of the fundamental (ie. test frequency) output. 5. 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 brick wall filter removes out of band noise.
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 6 6. sleep mode is enabled when the clk input is below the clk sleep frequency noted above. this is a power-saving mode. normal operation resumes automatically when the clk input is above the clk sleep frequency. note that the vdd supply is still required in sleep mode. audio interface timing t l_en clk (input) t l_dis t r_en t r_dis t cy dat is high-impedance (hi-z) when not outputting data dat (lrsel = 1) dat (lrsel = 0) figure 1 digital microphone interface timing test conditions the following timing information is valid across 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 data; this enables the outputs of two microphones to be connected together with the data from one microphone interleaved 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 left channel is transmitted following the rising clk edge (lrsel = 1). in this case, the left channel should be sampled by the receiving device on the falling clk edge, 3. similarly, the right channel is typically transmitted following the falling clk edge (lrsel = 0). in this case, the right channel should be sampled by the receiving device on the rising clk edge.
preliminary technical data wm7230 w ptd, rev 2.4, october 2012 7 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
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 8 applications information recommended external components it is recommended to connect a 0.1f decoupling capacitor between the vdd and gnd pins of the wm7230. a ceramic 0.1f capacitor with x7r dielectric or better is suitable. the capacitor should be placed as close to the wm7230 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 inco rporating a digital microphone input interface; these support direction connection to digital microphones such as the wm7230. stereo connection of two wm7230 digital microphones to the wm8994 codec is illustrated in figure 2. a 0.1f decoupling capacitor is recommended; this should be positioned close to the vdd pin of the wm7230. a ceramic 0.1f capacitor with x7r dielectric or better is suitable. further information on the wm8994 is provided in the 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. figure 2 stereo wm7230 digital microphone connection to wm8994
preliminary technical data wm7230 w ptd, rev 2.4, october 2012 9 recommended pcb land patterns figure 3 recommended customer pcb land pattern (note that all dimensions can be obtained from the package dimensions)
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 10 package dimensions (lga)
preliminary technical data wm7230 w ptd, rev 2.4, october 2012 11 important notice wolfson microelectronics plc (?wolfson?) 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 the date of shipment. wolfson reserves the right to make changes to its products and specifications or to discontinue any product 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 ne cessarily performed unless required by law or regulation. in order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. wolfs on is not liable for applications assistance or customer product design. the customer is solely responsible for its selection 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 sy stems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result 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 process in which its products or services might be or are used. any provision 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 noti ces (including this notice) and conditions. wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon. any representations made, warranties given, and/or liabilities accepted by any person 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
wm7230 preliminary technical data w ptd, rev 2.4, october 2012 12 revision history date rev originator changes 20/10/10 1.0/2.0 ph front page description and features re-worded. description of lrsel pin updated. electrical characteristics re-ordered, and terminology updated. microphone interface timing drawing and descriptions updated. frequency response graph added. illustration of recommended external components replaced with text. connection to wolfson codec text and illustration updated. recommended pcb land patterns moved to applications information. 26/10/10 1.0/2.0 jmacd package diagram dm089.d added 23/11/10 cst specification of fsr corrected. specification for thd corrected time to data valid changed to minimum grammatical errors 28/01/11 2.0 jmacd reel quantity added to order information 01/05/11 2.1 jmacd updated the lrsel pin description , timing diagram and notes for the rising and falling clock edges. sleep mode current updated to 2ua updated the reel quantity updated the start up time updated the new freq response and thd curves updated +3db frequency cut off updated vdd to 1.64v 06/09/11 2.1 jmacd package diagram updated to dm089.e. references and dimension letters changed to be consistent with all mems package diagrams. lid dimensions updated. swapped dimensions l and e. added marking area boundary 16/12/11 2.2 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 22/06/12 2.3 mr/jmacd dynamic range added, p5 active mode current changed to 700ua, p1 and p5 clk cycle time min and max updated, p6 package diagram updated to dm089f 08/10/12 2.4 jmacd optimised system rf design added.

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