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micrf1 1 3 qw ikradio ? ask tr ansmitter qw ikradio is a registered tradem ark of micrel, inc. micrel inc. ? 2180 fortu ne drive ? san jose, ca 95131 ? usa ? te l +1 (408) 9 44-08 00 ? fax + 1 ( 408) 474-1000 ? htt p :/ /www.micre l.com general description the micrf1 13 is a hi gh perfo rman ce, easy to use, singl e c h ip ask trans m itter i c for remo te wireless applic ations in the 300 to 45 0mhz freq ue ncy ban d. th is tran smitter ic is a true ?data - i n , antenn a-o u t? mon o lithic device. mi crf11 3 has t h re e strong attribut es: p o we r d e livery, ope rating voltage and operating te mperature. in terms of power, the micrf 113 i s capa ble of deliverin g +1 0 dbm into a 50 ? load. thi s power l e vel ena ble s a small form facto r transmitter (l o ssy a n tenn a) su ch a s a ke y fob tran smitter to operate n e a r the ma ximum limit of tran smissi on regul ation s . in terms of operatin g voltage, the micrf11 3 operates fro m 1.8v to 3. 6v. many tra n smitter ics in the same fre que ncy b and st op o p e r ating belo w 2.0v . the micrf 113 wi ll work with most batteri e s to the end of their useful limits. in terms of operatin g temperatu r e, the micrf 113 o perate s from -40 c to +85 c. the micrf1 13 is ea sy to use. it req u ire s a refe rence freque ncy (rf carrie r fre quen cy divid ed by 32 times) gene rated from a crystal with a few addition al externa l parts to c r eate a c o mplete vers atile trans m itter. the micrf113 operates with ask/ook (amplitude shift keying/on-off keyed) uhf re ceiver ty pes f r om wid e -ba n d sup e r-re gen e r ative radi os to n a rrow-ba nd, high perfo rman ce supe r-h e terodyn e receivers. the micrf 113? s maximum ask data rate i s 10kbps (man ch este r encodi ng ). the micrf1 13 tran smitte r sol u tion is ideal for in du strial and con s u m er a ppli c atio ns whe r e si mplicity an d form factor a r e imp o rtant. fe ature s ? complete uhf transmitter ? freq uen cy ra nge 30 0m hz to 450m hz ? data rates up to 10k bps a sk ? output power to 10dbm ? low exte rnal part count ? low voltag e ope ration (do w n to 1.8v) ? ope r at e wit h cry s t a ls o r ce rami c re so nat or s applicati o ns ? fan controll e r s ? remote power switches ? multi-me dia rem o te co ntrol ? remote sensor data link s ? infrare d tra n s mitter repla c em ent ordering inform ation part nu mb er t e mp . ran g e pack ag e micrf 113ym 6 ?40c to + 85 c sot 23-6 ty pical a pplic ation 1 2 3 1 2 3 6 5 4 p aout micrf1 1 3 vss vdd c4 18pf l2 82nh (150nh) l1 680nh (470nh) l3 pcb a ntenn a c2 4. 7 p f (6.8pf) c1 6.3v c3 10 pf 50v c5 18pf y1 13.560mhz (9.84375 mhz) vdd ask xtlin xtlout vdd da t a figure 1. mic r f113 a s k key fob design for 315 mhz and 433.92 m h z jun e 200 8 m999 9-06 020 8 (408) 94 4-08 0 0
mic r el, inc . micrf 113 jun e 200 8 2 m999 9-06 020 8 (408) 9 44-0 8 0 0 note : value s in dicate d in paren t heses are for 3 15mhz pin c onfi gur ation p aou t vss vdd ask xtlin xtlout 3 16 2 4 5 sot -23-6 pin d e s c r i ption pin number msop-6 pin na me pin f unc tio n 1 pa_out pa out put 2 v s s g r o u n d 3 vdd volt ag e drai n drain (i np ut ): posit i ve po w e r supp l y 4 xt lout cr y s t a l out (out put ): ref e ren c e oscill at or ou t put connect i on . 5 x t lin cr y s ta l in (inpu t): reference o scillator i nput c onn ection. 6 ask ask dat a input
micrel, inc. micrf113 june 2008 3 m9999-060208 (408) 944-0800 absolute maximum ratings (1) supply voltage vdd ...................................................+5.0v voltage on paou t......................................................+7.2v voltage on i/o pins ............................ vss?0.3 to vdd+0.3 storage temperature rang e ....................-65c to + 150c lead temperature (soldering, 10 seconds) ............ + 300c esd rating..................................................................2kv (3) operating ratings (2) supply voltage vdd ........................................ 1.8v to 3.6v ambient operating temperature (ta) ........ ?40c to +85c programmable transmitter frequency range ....................................................... 300mhz to 450mhz electrical characteristics (4) speci cations apply for vdd = 3.0v, ta = 25c, freq refosc = 13.560mhz, en = vdd. bold values indicate ?40c to 85c unless otherwise noted. 1kbps data rate 50% duty cycle. rl 50ohm load (matched) parameter condition min typ max units power supply @ 315mhz, p out = +10dbm 12.3 ma mark supply current i on @ 433.92mhz, p out = +10dbm 12.5 ma @ 315mhz 2 ma space supply current, i off @ 433.92 mhz 2 ma rf output section and modulation limits: @315mhz (4) 10 dbm output power level, p out ask "mark" @433.92mhz (4) 10 dbm @ 630mhz (4) 2nd harm. -39 dbc harmonics output for 315 mhz @945mhz (4) 3rd harm. -53 dbc @ 867.84mhz (4) 2nd harm. -55 dbc harmonics output for 433.92 mhz @1301.76mhz (4) 3rd harm. -55 dbc extinction ratio for ask 70 dbc ask modulation data rate 10 kbps @315mhz (6) <700 khz occupied bandwidth @433.92mhz (6) <1000 khz vco section @ 100khz from carrier -76 dbc/hz 315 mhz single side band phase noise @ 1000khz from carrier -79 dbc/hz @ 100khz from carrier -72 dbc/hz 433.92 mhz single side band phase noise @ 1000khz from carrier -81 dbc/hz reference oscillator section xtlin, xtlout pin capacitance 2 pf external capacitance see schematic c17 & c18 18 pf oscillator startup time (5) crystal: hc49s 300 s digital / control section output blanking vdd transition from low to high 500 s
micrel, inc. micrf113 june 2008 4 m9999-060208 (408) 944-0800 electrical characteristics (continued) parameter condition min typ max units high (v ih ) 0.8v dd v digital input ask pin low (v il ) 0.2v dd v high (v ih ) 0.05 a digital input leakage current ask pin low (v il ) 0.05 a under voltage lock out (uvlo) 1.6 v notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handling precautions recommended. human body model, 1.5k in series with 100pf. 4. measured using test circuit in figure 2. 5. dependent on crystal 6. rbw = 100khz, obw measured at -20dbc.
mic r el, inc . micrf 113 jun e 200 8 5 m999 9-06 020 8 (408) 9 44-0 8 0 0 te st circ uit 4 5 6 3 2 1 1 8 2 5 k10-a l101 50-8000mhz i/p o/p xtlout micrf1 1 3 sot - 6 xtlin ask vdd vss gnd ask k1-a k6-a k8-a k8-b k1-b y1 13.56mhz y2 9.84mhz r101 10k vdd agnd_sns p aou t c6 10f c5 0.1f c19 10pf c20 10pf c103 100pf l1 39nh sma-1 c4 10pf dv19_1s_vdd ddd7_2_ask dv19_1s_vdd f i g u r e 2. mic r f 113 t est ci rcu i t
mic r el, inc . micrf 113 jun e 200 8 6 m999 9-06 020 8 (408) 9 44-0 8 0 0 micrf113 pcb lay out recomm endations a ssem bly d r aw i n g micrf 113 5 0 oh m t est bo ard top la y e r micrf 113 5 0 oh m t est bo ard bottom lay e r micrf 113 5 0 oh m t est bo ard
mic r el, inc . micrf 113 jun e 200 8 7 m999 9-06 020 8 (408) 9 44-0 8 0 0 ty pical characteri stics usi n g micrf113, 50 ? test board 315m hz obw , a s k = 1khz 315mh z obw , a s k = 10 khz cw max po w e r @ 3v, 315m hz, a s k = 1k hz, note 1 rf spectrum 2 nd ha rmonic ; f u n d a men t al at 315 mhz rf spectrum 3 rd ha rmonic ; f u n d a men t al at 315 mhz 315m hz, po w e r l e v e l at sp ace, vdd = 3.0v, a s k = 1khz, -62d bm note 1. 1.2db ca ble loss.
mic r el, inc . micrf 113 jun e 200 8 8 m999 9-06 020 8 (408) 9 44-0 8 0 0 315m hz, z e ro sp an , a s k = 1khz 315m hz, z e ro sp an , a s k = 10k hz 315m hz, ph ase no ise, a s k = 1khz, 100 khz offset , ?75.59d bc/h z 315m hz, ph ase no ise, a s k = 1kh z, 1mhz offset, ?78.9 9 d b c/hz 315m hz, ph ase no ise, a s k = cw , 100 khz offset , ?70.96d bc/h z 315m hz, ph ase no ise, a s k = cw , 1mhz offset, ?76.7 2 d b c/hz
mic r el, inc . micrf 113 jun e 200 8 9 m999 9-06 020 8 (408) 9 44-0 8 0 0 433.9 2 mhz obw , a s k = 1k hz 433.9 2 mhz obw , a s k = 10 khz 433.9 2 mhz, c w max po w e r @ 3v, a s k = 1k hz, note 1 rf spectrum 2 nd ha rmonic ; f u n d a men t al at 433.9 2 mhz rf spectrum 3 rd ha rmonic ; f u n d a men t al at 433.9 2 mhz 433.9 2 mhz po w e r l e v e l at sp ace, vdd = 3.0v, a s k = 1khz, -52d bm note : 1.3d b ca b l e loss.
mic r el, inc . micrf 113 jun e 200 8 10 m999 9-06 020 8 (408) 9 44-0 8 0 0 433.9 2 mhz z e ro sp an , 1khz 433.9 2 a s k z e ro sp an at 10khz 433.9 2 mhz ph ase no ise, a s k = cw , 100 khz offset , ?81.73d bc/h z 433.9 2 mhz ph ase no ise, a s k = cw , 1mhz offset, ?78.4 9 d b c/hz 433.9 2 mhz ph ase no ise, a s k = 1khz, 100 khz offset , ?71.64d bc/h z 433.9 2 mhz ph ase no ise, a s k = 1khz, 1mhz offset, ?79.4d b c /hz
mic r el, inc . micrf 113 jun e 200 8 11 m999 9-06 020 8 (408) 9 44-0 8 0 0 functional dia g ra m pll x 32 xtlin x tlout pfd vco vdd vss lock amplitude divider enable control under v oltag e detect charge pump xt a l osc. p a p aout ask f i g u r e 3. f u n ctio n a l blo ck diag ram mic r f 113 functi onal de scri p tion figure 3 is a function al blo ck diag ram o f the micrf 1 13 transmitter. t he micrf1 1 3 is be st de scrib ed a s a p hase locked t r an smitter. the m i crf1 13 system is p a rtitio ned into five functional blo c ks: ? cry s tal oscill ator ? pll32 ? powe r ampli er ? enable control ? und e r voltag e detectio n cr y s tal oscillator the reference oscillator is cry s tal-based pierce con g u ratio n , desi gne d to accept cry s tal s with f r eq ue ncy from 9.375m hz to 14.0 6 2 5 mhz. cr y s tal oscillator parameters for as k operation figure 4 sho w s a referen c e o scill ator circuit con guration for ask operation. the referenc e os c illator is ca pable of driving cry s tals with esr range fro m 20 ? to 300 ? . whe n the es r of cry s tal is at 20 ? , the crys tal parameter limits are: esr 20 ? cpa r 2 to 10p f cmo 10 to 40 ff
mic r el, inc . micrf 113 jun e 200 8 12 m999 9-06 020 8 (408) 9 44-0 8 0 0 esr xtlout vss xtlin micrf 1 13 ask cryst al mode l c load c pa r c mo c load figure 4. reference oscillator a s k operation whe n the esr of cry s tal is at 3 0 0 ? , the c r ys tal para m eter lim its are: esr 300 ? c par 2 to 5pf c mo 10 to 40ff c load 10 to 30pf pll 32 the functio n of pll32 i s to provide a stable ca rrie r freque ncy for transmi ss ion . it is a ?divide by 32? ph ase locked lo op o scill ator. po w e r ampli f ier the po we r a m plifier serv es two purpo se s: 1) to bu ffer the vco fro m extern al elements a nd 2) to am plify the pha se lo cked signal. th e power am plifier can p r odu ce +10 d bm at 3v (typical). enable control enable cont rol gates the ask data. it only allows transmissio n whe n l o ck, amplitude an d unde r volt age detect conditions are valid. under volta g e de tec t ?un d e r volta ge d e tect ? bl ock sen s e s operating vol t age. if the operating voltage fa lls bel ow 1.6 v , ?unde r vol t age detect? blo ck will se nd a si gnal to ?ena b l e co ntrol ? bl ock to disabl e the pa.
mic r el, inc . micrf 113 jun e 200 8 13 m999 9-06 020 8 (408) 9 44-0 8 0 0 . applicati on inf o rm ation l1 820 nh (4 70 nh) c1 10 f 6. 3 v r7 r2 1 00k y1 13 . 5 6 0 m h z (9 . 4 3 7 5 m h z ) c2 1 00pf 50 v c1 1 n p c12 n p (4. 7 f/ 6. 3v/ 0805 ) c6 n p c 7 4. 7 p f (6 .8 pf ) c5 12 p f 5 0 v (10 p f 5 0 v ) c16 n p l4 68 nh ( 1 50n h ) l5 an t e n n a c10 0. 1 f 50 v c1 4 1 8pf c1 3 1 8pf c15 n p 1n f 4 5 6 3 3 2 2 1 1 x tlo ut m i c r f 1 13y m 6 x tli n ask vd d vs s pa o u t vd d re fos c da t a f i g u r e 6. a s k 433.9 2 mhz an d (315mhz) notes : 1. com p o n en ts la beled np are n o t place d. 2. values w i thout parent heses are for 433.9 2 mhz and v a l u es i n p a renth eses are f o r 315mhz. 3. value o f r7 is s e lected to v a r y t h e o u tp ut po w e r. the micrf1 13 is well sui t ed to drive a 50-o h m source, monop ole o r a loop ante n n a . figure 6 i s an example o f a loop a n tenn a co nfiguratio n. figu re 6 also shows both 315m hz and 433.92m hz ask conf igurations for a l oop antenn a. be sides u s ing a different cry s tal, tabl e 1 li sts modified valu es ne ede d for the listed fre quen cie s . fre que nc y (mhz) l1 (nh) c5 (pf) l4 (nh) c7 (pf) y1 (mhz) 315. 0 4 7 0 1 0 1 5 0 6 . 8 9. 843 7 5 433. 9 2 8 2 0 1 2 6 8 4. 7 13. 56 0 0 ta ble 1 the referen c e de sign sho w n in figu re 6 ha s a n ant enna optimize d fo r usin g the mat c hin g net wo rk a s describe d in table 1. po w e r ampli t ude control using exte r n al resis t or r7 i s used to adju s t the rf am plitu de outp u t levels whi c h may b e nee ded to meet co mplia nce reg u latio n . as an exa m ple, the follo win g table s li st typical valu e s of con d u c ted rf output le vels a nd co rre sp ondi ng r7 r e s i s t or va lues for th e 5 0 -ohm test boa rd, a s sh own in figure 2. r7 of the tx 11 3-1 c dem o board u s in g the loop antenn a can be adju s ted fo r the a pprop riate radiate d field allowe d by fcc o r etsi complia nce. conta c t mi crel for sug g e s ted r7 val u es to m eet fcc and etsi co mplian c e s .
mic r el, inc . micrf 113 jun e 200 8 14 m999 9-06 020 8 (408) 9 44-0 8 0 0 r7, ? output po w e r , dbm idd, m a 0 1 0 6. 7 7 5 8 . 5 6. 3 1 0 0 8 . 0 6. 2 5 0 0 1 . 6 4. 1 3 100 0 - 3 . 8 4. 8 7 ou tpu t po w e r versu s exte r n al resisto r a t 315mhz r7, ? output po w e r , dbm idd, m a 0 8 . 6 8 7. 5 7 5 8 . 3 4 7. 3 3 1 0 0 8 . 0 2 7. 3 5 0 0 4 . 3 4 6. 3 100 0 0 . 4 2 5. 5 ou tpu t po w e r versu s exte r n al resisto r a t 433.92 mhz outpu t po w e r on-off control there a r e t w o ways to enabl e the pa output p o we r. first, by supplying the ask signal wi th vdd appl ied contin uou sly, resulting in a mark a nd space rf ou tput con d ition. a seco nd m e tho d involve s ap plying bot h v d d and ask synchronously. t he se cond m e thod allows for longe r battery usage sin c e the battery is disco nne cted durin g no n-activation. figure 7 sho w s th e rf output ti me response si nce v d d and the ask are appli ed to the micrf 113. the rf outp u t resp on se, as a functio n of vdd, is typically less the n 1.25mse c. this me asure m ent wa s don e usi ng the circuit r y shown in figure 2. note : t h e a s k signal sho u ld n e v e r be a pplie d before vdd. rf ou tput respon se as a function o f vdd a nd ask figure 7 . rf outp ut re s pons e (vdd a nd a s k) outpu t ma tc hing net w o r k part of the fu nction of the output net wo rk i s to atten u a te the second and thi r d harmonics. whe n matching to a transmit freq uen cy, care must be ta ke n both to optimize for maximum output powe r , and to attenuate un wa n t ed harm oni cs. la y out issues pcb layout i s a pri m ary concern fo r a c hieving optim um perfo rman ce and con s iste nt manufa c tu ring results. care must used wi th the orienta t ion of comp onent s to ensure that they do not cou p le o r deco uple th e rf sig nal. pcb trace l ength shoul d be sho r t to minimize pa rasiti c indu ctan ce (1 inch ~ 2 0 n h). f o r exa m ple, dep en ding upon indu cta n ce value s , a 0.5 in ch tra c e can ch ange the indu ctan ce b y as much as 10%. to redu ce p a rasitic indu ctan ce, the pra c tice of using wi d e trace s an d a grou nd plan e und er the si gnal t r a c e s i s re comm en ded. via s w i th low va lue indu c t a n c e sh ou ld be us ed fo r comp one nts requiri ng a co nne ction-to -g roun d. antenna l a y out dire ctivity is affected by a n tenna trace l a yout. no g r o und plane sh ould be un de r the antenn a tra c e. for co nsi s t ent perfo rman ce, comp onent s shoul d not be pla c ed in side the loop of the anten na. gerb er fo rma t s (see figu re 8, for a sugg est ed layout) ca n be obtai ne d from the mi cre l web site at: http://www.mic r el.co m .
mic r el, inc . micrf 113 jun e 200 8 15 m999 9-06 020 8 (408) 9 44-0 8 0 0 pcb boar d a ssem bly d r aw i n g micrf 113 d e mo bo ard top la y e r micrf 113 d e mo bo ard bottom lay e r micrf 113 d e mo bo ard figure 8 . de mo boa r d pcb
mic r el, inc . micrf 113 jun e 200 8 16 m999 9-06 020 8 (408) 9 44-0 8 0 0 l1 820 nh ( 4 70 nh) c1 10 f 6. 3 v r7 r2 1 00k y1 1 3 . 560m h z ( 9 .4 3 75m hz ) c2 1 00p f 50 v c1 1 n p c12 n p (4. 7 f/ 6. 3v/ 0805 ) c6 n p c 7 4.7 p f (6 . 8 pf ) c5 1 2 p f 50v (1 0 p f 5 0 v ) c16 n p l4 68 nh (1 5 0 n h ) l5 an t e n n a c1 0 0. 1 f 50 v c1 4 1 8pf c1 3 1 8pf c15 n p 1n f 4 5 6 3 3 2 2 1 1 xt l o u t mi cr f 1 1 3 y m 6 xt l i n as k vd d vss pa o u t vd d vd d re f o s c da t a da t a con 3 j1 d a t a 3 ground 2 1.8v to 3.6v 1 vdd re f o s c con 2 j2 ground 2 external ref-osc 1 f i g u r e 9. t x 113-1 c demo b o ard sch e mat i c notes : 1. com p o n en ts la beled np are n o t place d. 2. values w i thout parent heses are for 433.9 2 mhz and v a l u es i n p a renth eses are f o r 315mhz. 3. value o f r7 is s e lected to v a r y t h e o u tp ut po w e r.
micrel, inc. micrf113 june 2008 17 m9999-060208 (408) 944-0800 functional description of tx113-1 evaluation board. figure 8 shows the tx113-1c demo board pcb layout and assembly (gerber format). figure 9 is a detailed schematic of the tx113-1c. note that components labeled as np (not placed) can be used to obtain different configurations. table 2 describes each header pin connector used in the demo board. pin function name functional description j1-1 vdd 1.8v to 3.6v input voltage j1-2 vss ground j1-3 ask modulating data input j2-1 ref-osc external reference oscillator input j2-2 vss ground table 2 tx113-1-433.92 ask bill of materials item quantity ref part pcb footprint mfg p/n manufacturer 1 1 c1 10f 0805 grm21br60j106ke01l murata 2 1 c2 100pf 0603 grm1885c1h101ja01d murata 3 1 c5 12pf 0603 grm1885c1h100ja01d murata 4 5 3 c6,c11,c16 (np) 6 1 c7 4.7pf 0603 grm1885c1h4r7ja01d murata 7 8 2 c13,c14 18pf 0603 grm1885c1h180ja01d murata 9 1 j1 con3 tshr-114-s-02-a-gt 10 1 l1 820nh 0805 0805cs-680xjb coilcraft 11 1 l4 68nh 0603 0603cs-082nxjb coilcraft 12 1 l5 antenna antenna loop, part of pcb 13 1 r2 100k ? 0603 crcw0603100kfkea vishay 14 1 r7 0 ? 0603 crc06030000z0ea vishay 13 1 u1 micrf113ymm6 micrf113ymm6 micrel 14 1 y1 13.560mhz xtal sa-13.5600-f-10-c-3-3 hib table 3
micrel, inc. micrf113 june 2008 18 m9999-060208 (408) 944-0800 tx113-1-315mhz ask bill of materials item quantity ref part pcb footprint mfg p/n manufacturer 1 1 c1 10f 0805 grm21br60j106ke01l murata 2 1 c2 100pf 0603 grm1885c1h101ja01d murata 3 1 c5 10pf 0603 grm1885c1h1000ja01d murata 4 5 3 c6,c11,c16 (np) 6 1 c7 6.8pf 0603 grm1885c1h6r8ja01d murata 7 1 c10 0.1f 0603 grm188f51h104za01d murata 8 2 c13,c14 18pf 0603 grm1885c1h180ja01d murata 9 1 j1,j2 con3 tshr-114-s-02-a-gt 10 1 l1 470nh 0805 0805cs-470xjb coilcraft 11 1 l4 150nh 0603 0603cs-r15xjb coilcraft 12 1 l5 antenna antenna loop, part of pcb 13 1 r2 100k ? 0603 crcw0603100kfkea vishay 14 1 r7 0 ? 0603 crc06030000z0ea vishay 13 1 u1 micrf113ymm6 micrf113ymm6 micrel 14 1 y1 9.84375mhz xtal sa-9.84375-f-10-c-3-3 hib table 4
mic r el, inc . micrf 113 jun e 200 8 19 m999 9-06 020 8 (408) 9 44-0 8 0 0 package inform ation 6-pin so t packag e t y p e (ym6) notes : 1. dimen s io ns an d tol e rances are in acc ordan ce w i th a n si y14 . 5 m , 1982. 2. package s u rfac e to be mirr or fi nish. 3. die is faci ng up for m o ld. die is facin g d o w n for trim/form, tha t i s , re v e r se tri m /form. 4. the foo t len g t h measuri ng is ba sed o n t h e ga ug e plane me tho d . 5 dimen s io ns are exclusi v e of m o ld f l ash a nd ga te b u rr. micrel, inc. 2180 fortune drive san jose, ca 9513 1 usa t e l + 1 (408) 9 44-0 800 f a x + 1 (408) 47 4-1 000 web ht t p : / / w w w . micr el. c om the information f u rnished b y micrel in this data sh eet is belie ved to be accurate and reliable. ho w e ver, no responsibility is a ssumed by micr el for its use. micrel reserves the right to change circuitr y a nd specifications at an y time w i tho u t notification to the customer. micrel products are not designed or autho ri zed for use as components in life support app liances, devices or sy stems where malfu nction of a product r e a s o n a b l y b e expected to res u lt in pers onal injur y . life suppo rt devices or sy ste m s are devices or s y stems that (a ) are in tende d for s u r g i c a l i m p l a into the bod y or ( b ) support o r sustain life, and w h o s e failure to perf o rm can be re asonabl y e x pected to result in a significan t injury to th e user. a purchaser?s use or sale of micrel products for use in life support appli ances, devices or s y stems is at purchaser?s ow n risk an d purchaser agre e s to fully indemnif y micrel for an y dam ages resulting fro m such use or sale. c a n n t ? 2008 micrel, in corporated.
micrel, inc. micrf113 june 2008 20 m9999-060208 (408) 944-0800

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