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w WM7133L bottom port analogue silicon microphone wolfson microelectronics plc pre-production, may 2014, rev 3.1 copyright ? 2014 wolfson microelectronics plc description the WM7133L is a low-profile silicon analogue microphone. it offers high signal to noise ratio (snr) and low power consumption and is suited to a wide variety of consumer applications. the WM7133L incorporates wolfson?s proprietary cmos/mems membrane technology, offering high reliability and high performance in a miniature, low-profile package. the WM7133L is designed to withstand the high temperatures associated with automated flow solder assembly processes. (note that conventional microphones can be damaged by this process.) features ? high snr (64.5db) ? low variation in sensitivity (3db) ? low current consumption (180a) ? analogue output ? bottom port lga package ? 1.5v to 3.7v supply applications ? mobile phone handsets ? wearable devices ? portable media players ? digital cameras block diagram 3d view 3.35mm x 2.50mm x 0.98mm lga package
WM7133L pre-production w pp, may 2014, rev 3.1 2 table of contents description ................................................................................................................ 1 ? features ..................................................................................................................... 1 ? applications .............................................................................................................. 1 ? block diagram ......................................................................................................... 1 ? 3d view ....................................................................................................................... .. 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 ? typical performance ............................................................................................ 6 ? applications information ................................................................................... 7 ? recommended external components ........................................................................ 7 ? optimised system rf design ........................................................................................... 7 ? connection to a wolfson audio codec .................................................................... 8 ? pcb land pattern and paste stencil .......................................................................... 9 ? package dimensions ............................................................................................. 10 ? important notice .................................................................................................. 11 ? address: ...................................................................................................................... ......... 11 ? revision history .................................................................................................... 12 ?
pre-production WM7133L w pp, may 2014, rev 3.1 3 pin configuration pin description pin name type description 1 vdd supply analogue supply 2 output analogue output microphone analogue output signal 3 gnd supply analogue ground ordering information device description temperature range moisture sensitivity level peak soldering temperature WM7133Lims/rv standard (tape and reel) -40 to +100 o c msl2a +260 o c note: reel quantity = 5000 all devices are pb-free and halogen free.
WM7133L pre-production w pp, may 2014, rev 3.1 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 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 -0.3v +4.2v 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 a 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 analogue supply range vdd 1.5 3.7 v ground gnd 0 v
pre-production WM7133L w pp, may 2014, rev 3.1 5 acoustic and electrical characteristics test conditions: vdd=1.8v, 1khz test signal, t a = 25c parameter symbol test conditions min typ max unit directivity omni-directional polarity positive sound pressure positive output voltage sensitivity s 94db spl -41 -38 -35 dbv acoustic overload no load, thd < 10% 126 db spl total harmonic distortion thd 100db spl 0.1 1 % 114db spl 0.2 122db spl 1 signal to noise ratio snr a-weighted 64.5 db dynamic range dr a-weighted 92.5 db frequency response -3db low frequency 85 hz +3db high frequency 10600 acoustic noise floor a-weighted 29.5 db spl electrical noise floor a-weighted -102.5 dbv power supply rejection ratio psrr 217hz sine wave, 100mv (peak-peak) 70 db power supply rejection psr 217hz square wave, 100mv (peak-peak) -96 dbv current consumption i vdd 180 240 a output dc impedance z out 55 ? terminology 1. sensitivity (dbv) - sensitivity is a measure of the micr ophone output response to the acoustic pressure of a 1khz 94db spl (1pa rms) sine wave. 2. total harmonic distortion (%) ? thd is the ratio of the rms sum of the harmonic distortion products in the specified bandwid th (see note below) relative to the amplitude of the fundamental (ie. test frequency) output. 3. signal-to-noise ratio (db) ? snr is a measure of the di fference in level between the output response of a 1khz 94db spl sine wave and the idle noise output. 4. 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. 5. all performance measurements are carried out within a 20hz to 20khz bandwidth 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 low pass filter removes out of band noise.
WM7133L pre-production w pp, may 2014, rev 3.1 6 typical performance sensitivity vs. frequency psrr vs. frequency sensitivity vs. supply voltage current consumption vs. supply voltage thd vs. sound pressure level
pre-production WM7133L w pp, may 2014, rev 3.1 7 applications information recommended external components figure 1 WM7133L recommended external components a dc-blocking output capacitor is required on the output pin, as illustrated in figure 1. a single capacitor is required for a single-ended connection. the capacitor must be correctly selected as it affects the cut-off frequency of the output path. a low cut-off frequency is desirable as it means there is no significant filtering of the audio bandwidth. the 3db cut-off frequency of the output path is given by the equation below, where c is the output capacitance and r is the input resistance of the other circuit. a typical recommended configuration, with 1uf dc-blocking capacitor and 20k ? minimum input circuit impedance, gives a 3db cut-off frequency of 10hz or less. tantalum electrolytic capacitors are particularly suitable for the dc-blocking components as they offer high stability in a small package size. 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.
WM7133L pre-production w pp, may 2014, rev 3.1 8 connection to a wolfson audio codec wolfson provides a range of audio codecs incorporating an analogue microphone input interface; these support connection to silicon microphones such as the WM7133L. the recommended connection of a WM7133L silicon microphone is illustrated in figure 2 (for single- ended mode) and figure 3 (for pseudo-differential mode). a dc blocking capacitor is required, as descr ibed in the previous section. a 2.2f decoupling capacitor is also recommended; this should be positioned close to the vdd pin of the WM7133L. further information on wolfson audio codecs is provided in the respective product datasheet, which is available from the wolfson website. figure 2 WM7133L single-ended connection figure 3 WM7133L pseudo-differential connection
pre-production WM7133L w pp, may 2014, rev 3.1 9 pcb land pattern and paste stencil the recommended pcb land pattern and paste stencil pattern for the WM7133L microphone are shown in figure 4 and figure 5. see also application note wan0284 (general de sign considerations for mems microphones) for further details of pcb footprint design. full definition of the package dimensions is provided in the ?package dimensions? section. figure 4 dm126 - pcb land pattern, top view figure 5 dm126 - paste stencil pattern, top view
WM7133L pre-production w pp, may 2014, rev 3.1 10 package dimensions
pre-production WM7133L w pp, may 2014, rev 3.1 11 important notice wolfson microelectronics plc (?wolfson?) products and services ar e sold subject to wolfson?s terms and conditions of sale, deli very and payment supplied at the time of order acknowledgement. wolfson warrants performance of its products to the specificati ons in effect at the date of shipment. wolfson reserves the righ t to make changes to its products and specifications or to disconti nue any product or service without notice. customers should there fore obtain the latest version of relevant information 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. speci fic testing of all parameters of each device is not necessarily performed unless required by law or regulation. in order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguard s to minimise inherent or procedural hazards. wolfson is not liabl e 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 systems, appliances, nuclear systems or systems where malfunction c an 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 intellectua l 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 pr oducts or services does not constitute wolfson?s approval, licen ce, warranty or endorsement thereof. any third party trade marks contained in this document belong to the respective third party o wner. reproduction of information from wolfson datasheets is permissibl e only if reproduction is without alteration and is accompanie d by all associated copyright, proprietary and other notices (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 ac cepted 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 representati ons, warranties or liabilities or for any reliance placed the reon 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
WM7133L pre-production w pp, may 2014, rev 3.1 12 revision history date rev description of changes page changed by 02/10/13 1.0 first release kc 06/12/13 1.1 codec referenced changed to wm8280. jmacd 18/12/13 1.1 acoustic and electrical characteristics: polarity added updates to: snr dynamic range acoustic noise floor electrical noise floor psrr mr 19/12/13 2.0 product status updated to preliminary technical data jmacd 29/01/14 3.0 product status updated to pre-production jmacd 26/02/14 3.0 formatting changes, incorporating 3d image on front page. updates to electrical characteristics and typical performance graphs. pcb land pattern updated; paste stencil drawing added. new package drawing incorporated. 1 5,6 9 10 ph 28/02/14 3.0 removed reference to wm8280 8 ct 24/04/14 3.1 miscellaneous formatting updates recommended external components updated 1, 5 8 ph
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