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lf to 2.7ghz dual 60db trupwr detector prelimi n ar y techni cal da t a AD8364 rev . prc 1/20/2 005 in fo rmation furn is h e d by an al o g dev i ces is believed to be a ccu rate and r e liable. how e ver, no r e spons i bili ty is assumed by analog devices fo r its use, nor f o r an y i n fri n geme nt s of p a t e nt s or ot her ri g h t s o f th ird parties th at may result fro m its use . specifications subject to chan g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot he rwi s e un der a n y p a t e nt or p a t e nt r i ghts of anal og de vices. trad emarks an d registered tra d ema r ks are the proper ty of th eir respectiv e co mpan ies. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2005 analog de vices, i n c. al l r i ght s r e ser v ed . features rms measur e m ent of high cr est-f a c t or sig n als d u al channel a n d d i ff er enc e o u tputs por t s int e gr a t ed ac cur a t e ly sc ale d t e mper a t ur e s e nsor w i de d y n a mic r a nge 1 db ov er 60 db @ 2 .2 ghz 0.5 db t e mpe r a t ure - stable linear-in- db res p o n se l o w log c o nf or manc e rip p le +5v o p er a t ion a t 70 ma , C40 c t o +8 5 c small footprint 5x5 mm lfcsp package applic ati o ns w i r e less infr a s t r uc tur e p o w e r a m plifier linea r iza t ion/c o n t r o l a n t e nna v s wr monit o r de vices gain control a n d measur eme n t transmitter si gnal strength indication (tssi) dual -channel wireless infras tructure ra dios func tio n a l block di agram de c a in l a co m r pw d n in l b in h b de c b ou t b vs t b fbk b ou t n ou t p fbk a ou t a vs t a in h a ch p a vpsa co m a vpsr a c m b t em p a c m a c l p a ch p b vp sb co m b a d j b a d j a v r ef vl vl c l p b tem p c h a nne l a tr up wr ? v2i bi a s v2i ou t a ou t b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 ch a n n e l b tr up w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 figure 1. functional bl ock diagra m gener a l description the AD8364 is a tr ue rms r e s p o n din g d u al c h anne l rf p o w e r m e as ur e m en t subsys t e m fo r t h e p r e c is e m e as u r em e n t and co n t r o l o f sig n al p o w e r . the f l exi b il i t y o f th e AD8364 al lo ws co mm uni c a t io ns sy stem s and inst r u m e n t a t ion, such as rf p o wer a m plif iers an d r a dio t r a n s c e i ver a g c cir c ui ts, to b e m o n i to r e d a nd co n t r o ll ed w i t h ea se . ope r a t i n g o n a s i n g l e 5v s u p p l y , ea c h cha n n e l is f u l l y sp e c if ie d fo r o p era t io n u p t o 2.7gh z , o v er a d y na mic ran g e o f 60db . the AD8364 p r o v ides acc u ra t e l y s c ale d , i n d e p e nd e n t , r m s output s of b o t h r f m e a s u r e m e n t ch a n nel s . a us ef u l m e as ur em e n t dif f er en ce b e tw e e n t h e two cha nne ls is als o made a v a i la b l e. on chi p ch a n nel ma tchi n g ma k e s t h e rms dif f er en ce o u t p u t ext r eme l y s t ab le w i t h t e m p er a t ur e and p r o c e s s va r i a t ion s . th e de vice als o i n cl udes a us ef u l t e m p er a t ur e s e n s o r w i t h a n a c c u r a t e ly s c a l e d vo lt ag e prop or t i on a l t o te m p e r a t u r e, s p e c if ie d o v er t h e de vice op era t in g t e m p er a t ure ra n g e . th e AD8364 can be us ed wi t h in p u t sig n als ha vin g rms val u es f r o m - 55db m t o +5dbm, re: 50 ? an d la rg e cr es t fac t ors wi t h n o acc u rac y deg r ad a t ion. i n teg r a t ed in t h e AD8364 a r e tw o w e l l -ma t ch e d ad8362 c h a n n e ls ( s e e ad83 62 d a t a s h e e t f o r m o r e i n f o ). enhanc em e n ts i n cl ude im p r o v e d te m p er a t ur e p e r f o r m a n c e an d r e d u c e d lo g-co nfo r ma n c e r i p p le v e rs us the ad8362. o n c h i p wide b a n d wid t h o p -a m p s a r e co nnec t e d t o ac co mm o d a t e f l exi b le co nf igur a t io n s tha t s u p p o r t ma n y sys t em s o l u tio n s. t h e devi ce ca n ea s i l y be co n f i g ur ed t o p r o v i d e th r e e r m s m e as ur em e n t s s i m u l t a n eo us l y . li n e a r - i n - d b rms m e a s ur em en t s a r e su p p l i e d a t out a a nd outb , w i t h c o n v e n ie n t ly s c a l e d sl op e of 50mv/ db . the rms dif f er en c e b e tw e e n outa a nd outb is a v a i la b l e dif f er en t i a l ly o r sin g le-ende d a t outp a nd outn . a n opt i on a l vo lt ag e a p pl i e d to vlv l prov i d e s a c o m m o n mo d e re f e re nc e l e v e l t o of f s e t outp a nd outn ab ove g r ou nd. e a c h c h a n ne l o f th e AD8364 c a n in dep e n d en tly be us ed t o co n t r o l s e p a ra t e gain con t r o l f eed back l o o p s usin g vs t a a nd vs t b . t h e dif f er en ce o u t p u t s als o p r o v ide fe e d b a ck co n t r o l w h i l e p r o v idi n g im p r o v e d t e m p era t ur e st a b i l i t y t h r o ug h ma t c he d cha n ne ls. flexi b ili t y exis ts t o us e ei t h er cha nne l as a r e fer e n c e w h i l e t h e o t h e r cha n n e l is sla v e d t h r o ug h a fe e d b a ck lo o p . rf p o w e r a m plif ier co n t r o l, v s wr m e a s ur e m en ts, a nd t r a n s c ei v e r a g c cir c ui ts b e n e f i t f r o m th i s f e a t ur e . i n co n t r o l m o d e s, th e o p posi t e po la ri ti es o f th e outp a nd out n output s a l l o w prop or t i on a l or c o m p l e me n t ar y ga in-con t r ol f u n c t i o n s, e l imi n a t in g t h e n e e d fo r a b o a r d-l e v e l s i g n - in v e r t ing a m pl if ier . f e e d b a ck pin s fbka an d f bkb allo w cus t o m lo o p r e gu la tion in sp e c ial co n t rol sys t em a p p l ic a t io n s and log-slo p e ad j u s t f l exi b i l i t y . w h e n on e channe l is s l a v e d o f f t h e o t her , co n t r o l l in g t h e v o l t a g e a t vlvl wil l ad j u s t t h e sla v e d c h a n ne l s rms v a l u e, i f a p o we r l e vel of f s e t i s de s i re d. the AD8364 is supplied in a 32 -lea d 5x5mm l f csp package, f o r the operati n g te mp erature of C40 o c to +85 o c.
preliminary technical data AD8364 rev. prc page 2 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units overall function channel a and channel b, cw sine wave input signal input interface inh[a,b] (pins 26, 31) inl[a,b] (pins 27, 30) specified frequency range lf 2.7 ghz dc common-mode voltage 2.5 v signal output interface out[a,b] (pins 15,10) small signal bandwidth c lpa = c lpb d 300pf tbd mhz slew rate c lpa = c lpb d 300pf tbd v/ p s settling time 10%-100% respon se of -45 dbm to 0 dbm modulated pulse, c lpa =c lpb =open tbd p s 100%-10% response of 0 dbm to -45 dbm modulated pulse, c lpa =c lpb =open, tbd ns wideband noise clpf = 1000pf, f spot d 100khz tbd nv/ ? hz measurement mode 450 mhz operation adja = adjb = 0 v, error referred to best fit line using linear regression @ p inh[a,b] = -40dbm & -20dbm, t a = 25 o c, balun = m/a-com mabaes0054 1 db dynamic range pins out[a,b] 67 db -40 o c < t a < +85 o c 65 db 0.5 db dynamic range -40 o c < t a < +85 o c 30 db maximum input level 1db error +15 dbm minimum input level 1db error -52 dbm slope 50 mv/db intercept -55 dbm output voltage ? high power in pins out[a,b] @ p inh[a,b] = -10dbm tbd 2.2 tbd v output voltage ? low power in pins out[a,b] @ p inh[a,b] = -40dbm tbd 0.7 tbd v temperature sensitivity deviation from out[a,b] @ 25c -40c preliminary technical data AD8364 rev. prc page 3 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units inputa to inputb isolation 30 db inputa to outb isolation inputb to outa isolation (note 1) p inhb = -50dbm, outb = outb pinhb 1 db p inha = -50dbm, outa = outa pinha 1 db tbd db input impedance inha/inla, inhb/inlb differential drive 210||0.1 : ||pf inha/inla, inhb/inlb single-ended drive tbd||tbd : ||pf input return loss with recommended balun tbd measurement mode 880mhz operation adja = adjb = 0 v, error referred to best fit line using linear regression @ p inh[a,b] = -40dbm & -20dbm, t a = 25 o c, balun = m/a-com etc 1.6-4-2-3 1 db dynamic range pins out[a,b] 59 db -40 o c < t a < +85 o c 54 db 0.5 db dynamic range -40 o c < t a < +85 o c 49 db maximum input level 1db error -2 dbm minimum input level 1db error -61 dbm slope 50 mv/db intercept -61 dbm output voltage ? high power in pins out[a,b] @ p inh[a,b] = -10dbm tbd 2.75 tbd v output voltage ? low power in pins out[a,b] @ p inh[a,b] = -40dbm tbd 1.1 tbd v temperature sensitivity deviation from out[a,b] @ 25c -40c preliminary technical data AD8364 rev. prc page 4 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units measurement mode 1880 mhz operation adja = adjb = 0.75 v, error referred to best fit line using linear regression @ p inh[a,b] = -40dbm & -20dbm, t a = 25 o c, balun = m/a-com etc 1.6-4-2-3 1 db dynamic range pins out[a,b] 57 db -40 o c < t a < +85 o c 52 db 0.5 db dynamic range -40 o c < t a < +85 o c 49 db maximum input level 1db error -5 dbm minimum input level 1db error -62 dbm slope 50 mv/db intercept -62 dbm output voltage ? high power in pins out[a,b] @ p inh[a,b] = -10dbm tbd 2.5 tbd v output voltage ? low power in pins out[a,b] @ p inh[a,b] = -40dbm tbd 1.0 tbd v temperature sensitivity deviation from out[a,b] @ 25c -40c preliminary technical data AD8364 rev. prc page 5 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units slope 50 mv/db intercept -58 dbm output voltage ? high power in pins out[a,b] @ p inh[a,b] = -10dbm tbd 2.3 tbd v output voltage ? low power in pins out[a,b] @ p inh[a,b] = -40dbm tbd 0.85 tbd v temperature sensitivity deviation from out[a,b] @ 25c -40c preliminary technical data AD8364 rev. prc page 6 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units temperature sensitivity deviation from out[a,b] @ 25c -40c preliminary technical data AD8364 rev. prc page 7 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units deviation from out[p,n] @ 25c -40c preliminary technical data AD8364 rev. prc page 8 of 23 AD8364-specifications table i. (v s =vpsa = vpsb = vpsr =5v, t a =25c, chan a freq = chan b freq , vlvl = vref, vst[a,b] = out[a,b], out[p,n] = fbk[a,b], differential input via balun 1 , cw input f d 2.7ghz unless otherwise noted) parameters conditions min typ max units temperature compensation pin adja and adjb input voltage range 0 2.5 v input resistance <1 m : voltage reference pin vref output voltage rf in = -55 dbm 2.5 v temperature sensitivity -40q c d t a d +85 q c 0.22 mv/ q c current limit source/sink into a grou nded load /to 1% change 18/6 ma temperature reference pin temp output voltage t a =25 q c, r l =10k : 0.6 v temperature slope -40q c d t a d +85 q c, r l =10k : 2 mv/ q c current source/sink t a =25 q c to 1% change 1.6/2 ma power down interface pin pwdn logic level to enable logic lo enables 1 v logic level to disable logic hi disables 3 v input current logic hi pwdn = 5v 100 p a logic lo pwdn = 0v <1 p a enable time pwdn lo to outa/outb at 100% final value, c lpa/b =open, c hpa/b =10nf rf in = 0 dbm 2 p s disable time pwdn hi to outa/outb at 10% final value, c lpa/b =open, c hpa/b =10nf, rf in = 0 dbm 1.6 p s power interface pin vps[a,b], vpsr supply voltage 4.5 5.5 v quiescent current rf in = -55 dbm, vs =5v 72 tbd ma supply current pwdn enabled, vs =5v 500 p a notes (not complete) 1. see figure/tpc x for a plot of isolation versus frequency for a 1 db error 2. see figure/tpc x 3. best fit line, linear regression
preliminary technical data AD8364 rev. prc page 9 of 23 absolute maximum ratings table 2. adl5306 absolute maximum ratings parameter rating supply voltage vpsa, vpsb, vpsr pwdn, vsta, vstb, adja, adjb input power (re: 50 : ) internal power dissipation t ja maximum junction temperature operating temperature range storage temperature range lead temperature range (soldering 60 sec 5.5v 0v, 5.5v tbd dbm tbdmw tbd c/w +125q c. -40q c to +85 q c -65q c to +150 q c +300q c 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.
prelimi n ar y techni cal da t a a d 8 3 6 4 rev. pr c page 10 of 23 pin conf iguration and fu nctional descri ptions de c a in l a co m r pw d n in l b in h b de c b ou t b vs t b fbk b ou t n ou t p fbk a ou t a vs t a in h a ch p a vpsa co m a vpsr a c m b t em p a c m a c l p a ch p b vp sb co m b a d j b a d j a v r ef vl vl c l p b tem p c h a nne l a tr up wr ? v2i bi a s v2i ou t a ou t b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 ch a n n e l b tr up w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 f i g u re 2. a d 83 64 p i nout ta ble 3. pi n f u nct i on d e s c ri pt i o ns p i n n a m e des c ri p t io n e q uiv . cir c ui t 1 chpb c o nn e c t to co mmo n via a ca p a ci to r to determin e 3 db p o i n t o f c h ann e l b in p u t sig n a l hig h -pas s f i l t er . 2,23 deca, decb d e co u p lin g ter m ina l s f o r inha / i nla and inhb/inlb . c o n n e c t t o co mm o n via a la r g e ca p a ci t a nce to c o m p lete in p u t cir c u i t. 3, 22, 29 comb, coma comr i n p u t sys t em co mm o n co nn e c t i o n . c o nn e c t via lo w im p e da n c e to sys t em co mm o n . 4, 5 adjb, adja t e m p e r a t ur e co m p en sa t i o n f o r c h a n n e l b a n d c h a n n e l a. an ext e r n a l v o l t a g e i s co nn e c t e d t o t h ese p i n s t o im p r o v e t e m p era t u r e d r ift. this v o l t a g e ca n be der i v e d f r o m v r ef , t h a t is, co nn e c t a r e sis t o r f r om v r e f t o a d j [ a , b ] a n d a n ot h e r re s i s t or f r om a d j [ a , b ] t o g r o u n d . t h e v a lu e of t h e s e re s i s t or s w i l l c h a n g e w i th fr eq u e n c y . 6 vref g e ne r a l - pur p os e re fe r e nce vol t ag e o u tput o f 2 . 5 v . 7 vlvl ref e r e n c e le v e l in p u t f o r outp and outn . (u s u a l l y co nn e c te d to vref t h r o ug h a v o l t ag e divider o r left o p en). 8, 17 clpb, clpa c h ann e l b an d c h ann e l a co nne ct io n f o r l o o p f i l t er in teg r a t io n (a v e rag i n g ) ca p a ci to r . c o n n e c t a g r o u n d -r ef er en ce d ca p a ci to r to t h is p i n. a r e sis t o r ca n b e co nn e c te d in s e r i es wi t h t h is ca p a ci to r to i m p r ov e l o op s t a b i l it y a n d r e s p on s e t i m e . 9 vstb th e v o l t a g e a p p l ie d t o t h is p i n se ts t h e de ci be l va l u e o f t h e r e q u i r ed rf in p u t v o l t a g e t o c h a n n e l b t h a t r e s u l t s in zer o cu r r en t o u t o f t h e lo o p in t e gra t in g ca p a ci t o r p i n, cl pb . 10 outb c h ann e l b o u t p u t o f er r o r am plif i e r . i n me as ur em en t mode, no r m a l ly co nn e c te d dir e c t l y to vstb . 11 fbkb f eed ba c k th r o u g h 1 k : to t h e n e ga t i v e ter min a l o f t h e in teg r a t e d o p -am p dr i v in g outn . 12 outn o u t p u t o f dif f e r e n c in g o p -am p . i n me as ur em en t mode, n o r m a l ly co n n e c te d dir e c tly to fbkb . 13 outp o u t p u t o f dif f e r e n c in g o p -am p . i n me as ur em en t mode, n o r m a l ly co n n e c te d dir e c tly to fbka . 14 fbka f eed ba c k th r o u g h 1 k : to t h e n e ga t i v e ter min a l o f t h e in teg r a t e d o p -am p dr i v in g outp . 15 outa c h a n n e l a o u t p u t o f er r o r a m pli f ier . i n m e as ur em en t m o de, no r m a l l y co nn e c te d dir e c t l y to vsta . 16 vsta th e v o l t a g e a p p l ie d t o t h is p i n se ts t h e de ci be l va l u e o f t h e r e q u i r ed rf in p u t v o l t a g e t o c h a n n e l a t h a t r e s u l t s in zer o cur r en t o u t o f t h e loo p in teg r a t in g ca p a ci to r p i n, clpa . 18, 20 acma, acmb an a l o g c o mmo n f o r c h a n n e l a &b . c o nn e c t v i a lo w im p e da n c e t o co mmo n. 21,25,32 vpsr, vpsa vpsb s u p p l y f o r t h e in p u t sys t em o f c h a n n e l a & b . s u p p l y f o r t h e in terna l r e f e r e n c es. c o nn e c t to +5 v po w e r s u p p l y . 19 temp t e mp e r at u r e s e n s or ou t p u t . 24 chpa c o nn e c t to co mmo n via a ca p a ci to r to determin e 3 db p o i n t o f c h ann e l a in p u t signa l hig h -pas s f i l t er . 26, 27 inha, inla c h a n n e l a ? h igh ? a n d ? l o w ? rf signa l in p u t t e rmi n a l . cir c ui t a 28 pwdn dis a b l e/en a b le c o n t r o l in p u t. a p pl y log i c hig h v o l t a g e to s h u t AD8364 do wn. 30, 31 inlb, inhb c h ann e l b ? l o w ? an d ? h ig h ? rf si g n a l in p u t t e r m i n a l . cir c ui t a un d e r pa c k a g e exposed paddle th e exp o se d pad d le o n t h e un der side o f t h e p a c k a g e s h o u ld be so l d er e d t o a lo w t h erma l a n d ele c tr ica l im p e da n c e g r o u n d plane.
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 11 of 23 typical perf orm ance cha r acte ristics v p = 5 v , t = +25 q c, ?40 q c, +85 q c; c lp a / b = o p e n . c o l o rs: +25 q c bl a c k ; ? 4 0 q c blu e ; + 8 5 q c re d 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 - 6 0 - 55 - 5 0 - 45 - 4 0 - 35 - 3 0 - 25 -2 0 - 15 -10 - 5 0 5 1 0 1 5 2 0 pi n ( d b m ) ou t a ( v ) -2 . 5 -2 -1 . 5 -1 -0 . 5 0 0.5 1 1.5 2 2.5 erro r a (d b ) fi g u r e 3 . out[ a , b] v ou t and l o g co nf or ma nc e v s . input a m plit ud e at 4 5 0 m h z, t y pi c a l de vic e , t ad ja /b = 0v , sin e w a ve , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 5 0 -45 - 4 0 -35 - 30 -2 5 - 20 -1 5 - 10 -5 0 5 1 0 pi n ( d b m ) outa (v ) -2. 5 -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 2. 5 er ror a (d b) fi g u r e 4 . ou t [ a , b ] v ou t and l o g conf or ma nc e v s . input a m plit ud e at 8 8 0 m h z, ty p i c a l d e v i c e , t ad j a /b = 0v , sin e w a ve , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 5 0 -45 - 4 0 -35 - 30 -2 5 - 20 -1 5 - 10 -5 0 5 1 0 pi n ( d b m ) outa (v ) -2. 5 -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 2. 5 er ror a (d b) fi g u r e 5 . ou t [ a , b ] v ou t and l o g conf or ma nc e v s . input a m plit ud e at 1. 88 gh z, ty p i c a l d e v i c e , t ad j a /b = 0. 75v , s i ne w a ve , d i fferential d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 5 0 -45 - 4 0 -35 - 30 -2 5 - 20 -1 5 - 10 -5 0 5 1 0 pi n ( d b m ) outa (v ) -2. 5 -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 2. 5 er ror a (d b) fi g u r e 6 . out[ a , b] v ou t and l o g conf or manc e vs. inpu t a m plit ud e at 2. 14 gh z, ty p i c a l d e v i c e , t ad j a /b = 1 . 02v , s i ne w a ve , d i f f e r e nt ia l d r iv e 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 5 0 -45 - 4 0 -35 - 30 -2 5 - 20 -1 5 - 10 -5 0 5 1 0 pi n ( d b m ) outa (v ) -2. 5 -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 2. 5 er ror a (d b) fi g u r e 7 . out[ a , b] v ou t and l o g conf or manc e vs. input a m plit ud e at 2. 5 g h z, t y pi c a l de vic e , t ad ja /b = 1 .14 v , si n e w a v e , di ffe r en ti al d r i v e 2700 m h z 1 00 m h z f i gure 8. d i ffer e nti a l i n put i m ped a nce (s1 1 ) v s . f r equen c y ; zo = 50 :
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 12 of 23 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 50 - 4 5 - 4 0 -35 - 30 -25 - 20 -1 5 - 10 -5 0 5 1 0 pin ( d b m ) out[p , n] (v ) -5 -4 -3 -2 -1 0 1 2 3 4 5 e r r o r [p ,n ] (d b ) fi g u r e 9 . out[p ,n] v ou t and l o g conf or ma nc e v s . input a m plit ud e at 4 5 0 m h z, w i t h b input held at -25db m and a input sw ept, t y pic a l d e vic e , t ad ja/b =0v , s i ne w a ve , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 50 - 4 5 - 4 0 -35 - 30 -25 - 20 -1 5 - 10 -5 0 5 1 0 pin ( d b m ) out[p , n] (v ) -5 -4 -3 -2 -1 0 1 2 3 4 5 e r r o r [p ,n ] (d b ) f i g u re 10. out[p , n ] v ou t and l o g co n f orm a nce v s . input a m plit ud e at 8 8 0 m h z, w i t h b input h e ld at - 2 5dbm and a input s w ept, t y pic a l d e vice , t ad ja/b =0v , sin e w a v e , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 50 - 4 5 - 4 0 -35 - 30 -25 - 20 -1 5 - 10 -5 0 5 1 0 pin ( d b m ) out[p , n ] ( v ) -5 -4 -3 -2 -1 0 1 2 3 4 5 e rror [p , n ] (d b) f i g u re 11. out[p , n ] v ou t and l o g co n f orm a nce v s . input a m plit ud e at 1. 88 gh z, w i t h b input h e ld at - 2 5dbm and a input s w ept, t y pic a l d e vice , t ad ja/b = 0 .75 v , s i ne w a v e , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 50 - 4 5 - 4 0 -35 - 30 -25 - 20 -1 5 - 10 -5 0 5 1 0 pin ( d b m ) out[p , n] (v ) -5 -4 -3 -2 -1 0 1 2 3 4 5 e r r o r [p ,n ] (d b ) f i g u re 12. out[p , n ] v ou t and l o g co n f orm a nce v s . input a m plit ud e at 2. 14 gh z, w i t h b input h e ld at - 2 5dbm and a input s w ept, t y pic a l d e vice , t ad ja/b = 1 .02 v , s i ne w a v e , d i f f e r e nt ia l d r ive 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 4. 5 5 -65 - 60 -55 - 50 - 4 5 - 4 0 -35 - 30 -25 - 20 -1 5 - 10 -5 0 5 1 0 pin ( d b m ) out[p , n] (v ) -5 -4 -3 -2 -1 0 1 2 3 4 5 e r r o r [p ,n ] (d b ) f i g u re 13. out[p , n ] v ou t and l o g co n f orm a nce v s . input a m plit ud e at 2. 5 g h z, w i t h b input held at -25db m and a input sw ept, t y pic a l d e vic e , t ad ja/b =1. 14v , sin e w a v e , d i f f e r e nt ia l d r ive -2 -1 .5 -1 -0 .5 0 0. 5 1 1. 5 2 - 6 5- 6 0 - 5 5- 5 0 - 4 5- 4 0 - 3 5- 3 0 - 2 5- 2 0 - 1 5- 1 0 - 5 0 5 1 0 pi n ( d bm ) er ro r ( d b) f i g u re 14. d i s t r i but i on of out[ a , b] e r r o r o v er t e mper atu r e a f ter a m bie n t nor m al iz atio n v s . input a m pl itude f o r 10 d e v i ces, f r eque nc y=4 50 m h z, t ad j a /b = 0 v , s i n e w a v e , di ffer e nti a l dri v e
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 13 of 23 -2 -1 .5 -1 -0 .5 0 0. 5 1 1. 5 2 -6 5 - 60 -5 5 - 50 -45 - 4 0 -35 - 30 -25 - 2 0 -15 - 1 0 -5 0 5 1 0 pi n ( d bm ) e rror (d b) f i g u re 15. d i s t r i but i on of ou t [ a , b ] e r r o r at t e mpe r at u r e a f ter a m b i ent no r m a l i z at ion vs . input a m pl i t ude fo r 10 de vic e s , f r e q ue nc y= 88 0 mh z, t ad ja/b = 0v , sin e w a v e , d i f f e r e nt ia l d r ive -2 -1 .5 -1 -0 .5 0 0. 5 1 1. 5 2 -6 5 - 60 -5 5 - 50 -45 - 4 0 -35 - 30 -25 - 2 0 -15 - 1 0 -5 0 5 1 0 pi n ( d bm ) e rror (d b) f i g u re 16. d i s t r i but i on of ou t [ a , b ] e r r o r at t e mpe r at u r e a f ter a m b i ent no r m a l i z at ion vs . input a m pl i t ud e fo r 10 de vic e s , f r e q ue nc y=1 . 8 8 ghz, t ad ja/b = 0. 75v , sin e w a ve , d i f f e r e nt ia l d r ive -2 -1 .5 -1 -0 .5 0 0. 5 1 1. 5 2 -6 5 - 60 -5 5 - 50 -45 - 4 0 -35 - 30 -25 - 2 0 -15 - 1 0 -5 0 5 1 0 pi n ( d bm ) er ro r ( d b) f i g u re 17. d i s t r i but i on of out[ a , b] e r r o r at t e mpe r at u r e a f ter a m b i ent no r m a l i z at ion vs . input a m pl i t ud e fo r 10 de vic e s , f r e q ue nc y=2 . 1 4 ghz, t ad ja/b = 1. 02v , s i ne w a ve , d i f f e r e nt ia l d r ive -2 -1 .5 -1 -0 .5 0 0. 5 1 1. 5 2 - 6 5- 6 0 - 5 5- 5 0 - 4 5- 4 0 - 3 5- 3 0 - 2 5- 2 0 - 1 5- 1 0 - 5 0 5 1 0 pi n ( d bm ) e rror (d b) f i g u re 18. d i s t r i but i on of out[ a , b] e r r o r at t e mpe r at u r e a f ter a m b i ent no r m a l i z at ion vs . input a m pl i t ud e fo r 10 de vic e s , f r e q ue nc y=2 . 5 ghz , t ad ja/b = 1 . 14 v , s i ne w a v e , d i f f e r e nt ia l d r ive -2 -1 0 1 2 - 4 0 - 30 - 2 0 - 10 0 1 0 2 0 rfi n ( d b m ) e r ro r (d b ) id e a l +5 -5 + 15 -1 5 -1 d b ph as e : in lx w r t in hx in hx < i n lx f i g u re 19. v ou t a n d l o g conf or ma nc e v s . input a m plitud e for m a gn itude b a lan c e of 0 db , and -1 d b and phase b a lance of 0 deg , 5 deg , 15 d e g at 450 m h z, t y p i c a l d e v i ce , t ad ja/b = 0v , sine w a ve , d i fferential d r ive f i gure 20. o u tput r e s p ons e to r f burs t input for v a ri ous r f input l e vels, car r ie r f r equ e nc y 45 0 m h z, cl p a / b = 0
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 14 of 23 f i gure 21. o u tput r e s p ons e to r f burs t input for v a ri ous r f input l e vels, ca rr i e r f r equ e nc y 45 0 m h z, cl p a /b = 0.1 f f i gure 22. o u tput r e s p ons e u s i n g p o wer - d o wn mod e fo r v a ri ous r f inp u t l e vels, carr ie r f r equ e nc y 45 0 m h z, cl p a = 0 f i gure 23. o u tput r e s p ons e u s i n g p o wer - d o wn mod e fo r v a ri ous r f inp u t l e vels, carr ie r f r equ e nc y 45 0 m h z, cl p a = 0. 1 f , c h p a = 10 nf 2.486 2.488 2.49 2.492 2.494 2.496 2.498 2.5 2 .502 2.504 2.506 vref (volts) 0 2 4 6 8 10 12 14 count total = 40 devices rf input = -60 dbm f i g u re 24. d i s t r i but i on of v r e f f o r 4 0 d e v i c e s 0. 617 0. 619 0. 621 0 . 623 0. 625 0. 627 temp ( volts) 0 1 2 3 4 5 6 7 8 c o unt to ta l = 40 devi ces rf i n put = -60 dbm f i g u re 25. d i s t r i but i on of te m p vo lt ag e f o r 4 0 d e v i c e s -2 0 -1 5 -1 0 -5 0 5 10 15 20 - 4 0 - 3 0 - 2 0 - 1 0 0 1 02 0 3 04 05 06 07 08 09 0 te m p ( d e g c ) c h a n g e in vref ( m v) f i gure 2 6 . change in vref vs . t e m p er atur e , 11 p a r t s
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 15 of 23 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 -60 - 5 5 -5 0 - 45 -40 - 35 -3 0 - 2 5 -20 - 15 -10 - 5 0 5 1 0 pi n (db m ) ou t a ( v o l t s ) -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 e r ro r ( d b ) cw v o u t 1 cha n n e l vo ut 3 cha n n e l vo ut 4 cha n n e l vo ut 11 ch a nne l vo ut cw e rror 1 cha n n e l e rror 3 ch an ne l e rror 4 cha n n e l e rror 11 ch a nne l e rror f i gur e 27. o u tpu t v o l t ag e and e r r o r f r om c w l i ne a r r e f e r e nce v s . i n pu t am p l i t ud e wi t h di ff e r en t w a v e f o rm s, c w , w c d m a1 , 3 ,4 a n d 11- cha n n e l , f r e q uen c y 880mh z . 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 -60 - 55 -50 - 45 -4 0 - 35 -30 - 2 5 -20 - 15 -10 - 5 0 5 1 0 pin ( d b m ) ou t a ( v o l t s ) -2 -1. 5 -1 -0. 5 0 0. 5 1 1. 5 2 e rro r ( d b ) cw v o u t 1 cha n n e l vo ut 3 cha n n e l vo ut 4 cha n n e l vo ut cw e rror 1 cha n n e l e rror 3 ch an nel e rror 4 cha n n e l e rror fi g u re 2 8 . o u t p u t v o l t a g e a n d e r ro r f r o m c w l i n e a r r e f e re n c e v s . i n p u t am p l i t ude wi t h di ff e r en t w a v e f o rm s, cw , w c d m a 1,3,4-cha n n e l , f r e q uen c y 2140 m h z
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 16 of 23 gener a l desc riptio n and t h eo r y th e AD8364 is a d u a l ch a n n e l 2.7gh z t r ue rms r e s p o n din g detec t o r wi t h 6 0 db me as ur emen t ra n g e a n d in co r p o r a t es tw o ad8362 ch a n n e l s wi t h s h a r e d r e f e r e n c e cir c ui t r y ( se e t h e ad83 62 d a t a s h e e t f o r m o r e i n f o r m a t i o n ). m u l t i p l e enh a n c e m en ts h a v e b e en ma d e t o t h e a d 836 2 co r e s t o im p r o v e me as ur em en t accura c y . log-co nf o r m a n c e p e ak-t o- p e ak ri p p l e h a s b e en re du c e d t o < 0.2 db , o v er t h e en tir e d y n a mic ra n g e . t e m p era t ur e s t a b i l i t y o f t h e rms o u t p u t m e as ur em en ts p r o v ides < 0.5 db er r o r o v er t h e s p ecif ie d t e m p era t ur e ra n g e o f -40 o c t o 85 o c, t h r o ugh p r o p r i et a r y t e c h niq u es. th e u s e o f w e ll ma t c h e d ch a n n e l s o f f e r s extr eme l y t e m p era t ur e s t a b le ch a n n e l dif f er e n ce output s a t out p and outn . give n wel l ma tche d chan nels t h ro u g h ic i n te g r a t i o n , t h e r m s m e a s u r e m e n t output s , ou ta and outb , wi ll drift in th e sa m e m a nn er (< 0.5 db). w i th outp sho r te d to fbka , t h e f u n c t i o n a t out p is: ou t p ou t a ou t b vl v l wh e n outn is sho r te d to fb kb , t h e f u n c t i o n a t outn is: ou t n ou tb ou t a vl v l t , outp and outn , a r e in sen s i t iv e t o th e c o m m on d r i f t du e t o t h e d i f f e r e n c e c a nc e l l a t i on of ou t a ou t b t ad d c u , ad t a n l a co p d n n l b nb ou t b vtb bb ou t n ou t p ba ou t a vt a n a c pa co a vp aco t p a co c lpa c p b c o b v vlvl clpb tem p ch a n n e l a tr u p wr ? v2 i bi a s v2 i out a out b 25 1 2 3 4 5 6 13 15 14 16 22 11 10 9 8 7 24 23 22 21 20 19 17 18 c h a nne l b tr u p wr ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 ad j b ad j a deca vpsb decb v psa f i g u re 29. b l o c k d i ag r a m a s i ng l e chan nel of t h e a d 8 3 6 4 c o ns ist s of a h i g h p e r f o r ma nc e a g c l o op . r e fe r r i n g t o f i g u re 3 0 , t h e a g c l o op i s c o m p r i s e d of a w i de b a n d wid t h va r i a b le ga in a m plif ier (v ga), s q ua r e la w det e c t o r s, a m p l i t ud e t a r g e t c i r c ui t, a n d o u t p u t d r i v er . fo r m o r e deta ile d des c r i p t io n o f th e f u n c tio n al b l o c ks, s e e ad8362 da t a s h e e t. sq ua r e l a w d e t e ct o r a n d a m p l i t ude t a r g e t t h e output of t h e v g a , c a l l e d v sig , i s a p p l i e d t o a w i d e b a n d sq ua r e la w det e c t o r . th e d e t e ct o r p r o v id es t h e t r ue rms re sp ons e of t h e r f i n put s i g n a l , i n d e p e nd e n t of w a v e for m , up t o c r e s t f a c t or s of 6 . t h e d e t e c t or output , c a l l e d i sq u , i s a f l uct u a t in g cu r r e n t w i th po s i ti v e m e a n v a l u e . t h e d i ff e r e n ce be t w e e n i sq u and an i n te r n a l l y ge ne r a te d c u r r e n t , i tg t [ a , b ] ,is in t e gra t ed b y c f and a c a p a ci t o r a t t a che d to clp[a,b] . c f is t h e o n chi p 2 5 pf f i l t e r c a paci t o r . clp[a,b] ca n be u s ed t o a r b i tra r i l y in cr ease th e a v er a g in g tim e wh ile trad in g o f f r e s p o n se tim e . w h en t h e a g c lo o p is a t e q ui li b r i u m: mean( i sq u ) = i tg t [ a , b ] (3 ) t h is e q u i libr ium o c c u rs o n ly w h e n : mean( v sig 2 ) = v tg t [ a , b ] 2 (4 ) w h er e v tg t is a n a t t e n u a t e d v e r s io n o f t h e v ref vol t age. s i n c e t h e sq ua r e la w det e c t o r s a r e e l ec tr ic all y iden t i cal a n d wel l ma tche d, pr o c e s s and tem p e r a t u r e - dep e ndan t var i a t i o ns ar e e f fe c t ively c a nc el le d. f i gure 30. s i ngl e c h ann e l d e t a i l s b y f o r c in g th e a b o v e id e n ti t y th r o ugh v a r y in g th e v g a se t - p o i n t , i t i s app a r e nt t h at : rms( v sig ) = ? (mean ( v sig 2 )) = ? ( v tg t 2 ) = v tg t (5 ) s u bs ti t u tin g t h e val u e o f v sig , w e h a v e : rms( g 0 * rf in ex p ( - v st [ a , b ] / v gns )) = v tg t (6) w h en co nn e c t e d as a me as ur emen t de v i ce vs t[a, b] = o u t[a,b] . s o l v i n g f o r o u t[ a,b] as a f u n c tio n o f rf in : o u t[a,b] = v slop e *l og10(rms( rf in )/ v z ) (7) w h er e v slop e is a p p r o x im a t e l y1v/de c a de o r 5 0 mv/db . v z is t h e in t e r c ep t v o l t a g e, sin c e l o g10(1) = 0 wh en rms( rf in ) = v z . i f desir e d , th e ef f e c t iv e val u e o f v slop e ma y b e a l ter e d b y x 2 x 2 i sq u i tg t c lpf ex t e rnal interna l res i s t ors s e t buff e r gain to 5 matc he d w i de ban d s quar er s v si g v i n v ou t [ a , b ] ban d - g ap ref e r enc e set- p o i n t interf ac e v st [ a , b ] clp[a,b] v st[a,b] inh[a,b] inl[a,b] v ref v re f out[a,b] a dj[a,b] a com o u tput buff er g se t a m p litud et ar get fo r v si g c f chp[a,b] o ffs e t ? n u llin g 2. 5v vg a -28 t o +40db v re f t e m per atur e com pens ation
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 17 of 23 usin g a r e sis t o r divid e r f r o m o ut[a,b] to dr ive vst[a,b] . th e in t e r c e p t, v z , is a ppr o x ima t ely 316 p v (-70 db v) w i t h a cw si g n a l . this is t h e ext r a p ola t ed i n ter c ept si nce out[a,b] do es not me a s u r e do w n to 0 v . i n most a p plic a t i o ns, t h e a g c lo o p is clos e d thr o u g h t h e s e t p o in t in t e rfac e , vst[a,b] . i n me asu r emen t mo de, out[a,b] is t i e d to vst[ a,b] , r e s p e c t i v e l y . i n c o n t r o l l e r m o d e , a c o n t r o l vol t age is a p plie d to vst[a , b] . p i n s out[ a,b] dr iv e t h e co n t r o l in p u t o f a sys t em. th e rf f e e d b a c k sign al t o t h e in p u t p i n s is f o r c e d t o h a v e a n rms val u e det e rmin e d b y vsta or vstb . rf i n p u t i n t e rfa c e t e ad36 s rf in p u ts a r e co nn e c te d as s o w n in f i g u r e 3 . t er e a r e 00 r e sis t o r s co n n e c t e d b e tw e e n d e c[a,b] a n d inh[a,b ] a n d inl[a,b ] . t e mid po i n t i s w i r e d t o a p i n c a l l e d d e c [ a , b ] . int e r n a l l t o t e ic , t e d c l e v e l on d e c [ a , b ] i s es t a blis e d as vps[a,b] 55vb e/30. w i t a 5v s u p p l , d e c[a,b] is a t a b o u t 2.6v . s i gn al co u p lin g c a p a ci t o r s m u s t b e co nn ec t e d f r o m t e in p u t sign al t o t e i n h[a,b] a n d i n l[a,b] p i n s . t e ig p as s co r n er is fo u n d as f i gpas s /2 s 00c a de c o u p ling c a p a cito r so u ld b e c o nne c te d f r o m de c[ a,b] to g r o u n d to a t ten u a t e a n s i g n a l a t t e mid p o in t. a 00pf and 0. f cap fro m dec [ a,b] to g r ound are reco mmended w i t a nf cou p ling c a pacito r su c t at signals above .6mh can be measured. for coupling of sig n als below .6mh, a good rule of tumb would be to use 00c couplin g for te dec [ a,b] cap a citor. f i g u re 3. a d 3 6 r f input s off s et c o m p e n s a tio n a n o f f s etn u l lin g lo o p is use d t o add r es s sm all d c o f f s ets in t e v a. t e igp as s co r n er fr e q uen c o f t i s lo o p is in t e r n all pr e s et to a b o u t m h usi n g a n o n ci p c a p a c i to r o f 25p f /2 s 5k 25pf, s u f f icie n t l lo w f o r m o s t hf ap p l i c at i o n s . t e i g p a s s c o r n e r c a n b e re du c e d b a c a p a cito r f r o m c h p [ a, b] to gr o u nd. t e i n put o f fs e t v o l t a g e va ries d e p e n d in g o n t e ac t u al ga in a t wic t e v a is o p era t in g, a n d t us, o n t e in p u t sign al a m pli t ud e . w en a n ex ces s iv e l la r g e val u e o f c hp[a,b] is us e d , t e o f fs et co r r ec tio n p r oces s ma la g t e mo r e ra p i d c a n g e s in t e v a s ga in, wic m a in c r ea se t e ti m e r e q u i r ed f o r t e lo o p to fu l l s e t t le f o r a giv e n s t e a d in p u t a m pl i t ude. t e mpe r a t ur e se ns o r i n t e rfa c e t e ad36 p r o v id es a tem p era t ur e s e n s o r o u t p u t c a p a ble o f dr ivin g a b o u t .6 ma. a 3 3 0 in t e r n al r e sis t o r is co nn ec t e d f r o m temp to co m r to p r o v ide c u r r e n t si n c a p a bi l i t . t e t e m p e r a t u r e s c a l i n g f a c t or of t e output vol t age is a p p r o x i m a t el 2m v/ o c. t e tp i cal a b so l u t e vol t age a t 2 o c is a b o u t 630 mv . vre f i n t e rface a n in t e r n al v o l t a g e r e f e r e n c e i s p r o v ide d t o t e user a t p i n vre f . t e vref vol t age is a te m p e r a t ure s t a b l e 2 . 5 v r e f e r e n c e t a t ca n dr i v e a b o u t ma. a n 30 in t e rn al re s i st or i s c o n n e c t e d f r o m vref to ac o m for 6 m a s i n ca pa b i l i t . p o wer d o w n i n t e rf ac e t e o p era t in g a n d s t a n db c u rr en ts f o r t e ad36 a t 2 q c a r e a p p r o x ima t el 2 ma a n d 500 p a r e s p ec tiv e l t e pwd n pi n is co nne c te d to an i n ter n a l r e sist o r divi de r made wi t tw o 2k r e sis t o r s. t e divider v o l t a g e is a p pl ie d to t e ba se o f a n n p n tr a n s i s t o r t o f o r c e a p o w e r d o wn co n d i t io n w en t e d e vice is ac tiv e . t p i c a l l w en pwd n is p u l l e d g r e a t e r t a n .6v t e de v i ce is p o w e r e d do wn. fi g u re 2 2 s ow s t p i c a l r e s p on s e t i m e s f o r v a r i o u s r f i n p u t l e vels . t e o u t p ut re ace s to w i t i n 0 . d b o f it s ste a d s t a te va l u e in a b o u t .6 p s t e re fe r e nc e vol t age is a v ai l a bl e to f u l l accura c in a m u c s o r t e r time . t is w a eu p r e s p o n se wi ll va r in deta i l de p e n d in g o n t e in p u t co u p l i n g m e a n s a n d t e c a p a ci ta n c es c d e c[a , b ] , c hp [a,b ] and c lp[a,b] t ese r e s u l t a r e f o r a me as ur emen t s s t em o p era t in g in t e 0. t o 2 h r a n g e , b a l u n co u p l e d a t t e in p u t p o r t , wi t c d e c[a ,b ] 00 nf , c hp [a, b ] op en a n d c lp[a,b] op en . vs t [ a , b ] i n t e r f a c e t e vs t [ a , b ] in ter f ace a s a ig in p u t im p e da n c e o f 2k . t e vol t age a t vs t [ a , b ] is co n v er t e d t o a n in t e r n al c u r r en t us e d to s t e e r t e v a ga in. te v a a t ten u a t io n co n t r o l is s e t to 20 db/v . v in inh[a,b] inl[a,b] dec[a,b] v g a v p o s c o m m v pos v pos comm comm
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 18 of 23 ou t [ a , b, p , n ] o u tpu t s th e o u t p u t d r i v ers us e d in t h e AD8364 a r e dif f er en t t h a n th e o u t p u t s t a g e o n t h e ad8362. th e AD8364 in co r p o r a t es ra il-to- ra i l o u t p u t driv ers wi t h p u l l -u p a n d p u l l -do w n c a p a b i li ty . o u t[a,b , p , n ] c a n so ur ce a n d sink u p 70ma. th er e is al so a n in t e r n al load f r o m b o t h o u t a a n d o u tb t o a c o m o f 2.5 k : . m e a s u r ement d i f f eren c e o u t p ut u s ing o u t [ p , n] th e AD8364 in co r p o r a t es tw o o p era t io n a l a m pl if iers wi t h ra i l - t o -ra i l o u t p u t ca p a b i li ty t o p r o v id e a dif f er en ce o u t p u t . a s in t h e ca se o f th e o u t p u t d r i v e r s f o r o u t [ a , b ] , th e o u t p u t s t a g e s h a v e t h e c a p a b i l i ty o f dr ivin g 160 ma. ou t a and ou t b are i n ter n a l ly c o nn e c te d t h r o u g h 1k : r e sis t o r s t o t h e in p u ts o f e a ch op - a m p . t h e pi n vl vl is co n n e c t e d t o t h e p o si tiv e t e rmin al o f bo t h o p - a m p s t h r o u g h 1 k : r e sis t o r s to p r o v ide l e v e l s h if tin g . th e n e ga t i v e f e e d b a c k t e rmin al is al so m a de a v a i la b l e t h r o ugh a 1k : r e si s t o r . th e in p u t im peda n c e o f vl v l is 1k : and fb k [ a, b ] is 2k : .. s e e f i gur e 32 b e lo w f o r th e co nn e c tio n s o f th e s e p i n s . dec a in l a co mr pw d n in l b in h b de c b ou t b vs tb fb k b ou t n out p fb k a ou t a vs ta in h a ch p a vpsa co m a vps r acm b t emp a c m a c l p a ch p b vps b c o m b a d jb a d ja vr ef vl vl cl p b te m p ch a n ne l a tr up w r ? v2 i bi a s v2 i ou t a ou t b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 ch a n n e l b tru p w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 f i g u r e 32. o p - a m p c o nnec t ions ( a l l r e sist or s ar e 1k : 12 % ) if ou t p is c o nne c te d to fb k a , t h e n ou t p will b e gi v e n a s : ou t p ou t a ou t b v l vl ou t n b b , ou t n ou t n ou tb ou t a vl vl , ou t [ a , b, p , n ] a ou t p ou tn vl v l ad c c t a d a b a ou t p , t 1 2 % . i f c h an nel a is d r ive n and c h a n ne l b h a s a fe e d b a ck l o op f r om ou t p th r o ugh a p a , t h e n ou t p w i l l i n te g r a t e to a vol t age v a l u e such t h a t : ou t b ou t a vl vl t ou t n ou t n v vl vl ou t a , , ou t n vl vl ou t a vl vl ou t a , ou t b ou t a t , , ad j a ad jb , , ad j a ad j b t c a c b a , vl v l , c , ou t n ou t n ou t p t ou t b ou t p ou t b out a vl vl vl vl ou t a , ou t n v , ou t n vl vl o u t a t c a c b c b c b , ou tb ou t a ou t n ou t p t c a t ad , , ad j[ a b] p ,
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 19 of 23 ab s o lut e v a lu e of c o m p e n s a t i o n i s d i f f e r e n t fo r v a r i ou s f r eq uen c ies. t h e f o llo w in g c h a r t c a n b e u s ed t o a p pl y th e a ppro p r i a t e ad j[ a/ b] vol t age to mai n t a i n a te m p e r a t ure dr i f t er r o r les s t h a n +/- 0.5db o v er t h e en tir e t e m p era t ur e ra n g e . f (mh z ) 4 5 0 9 0 0 1 7 0 0 1 9 0 0 2 2 0 0 2 5 0 0 2 7 0 0 ad j[a/b] ( v ) 0 0 0 0 . 7 5 1 . 0 2 1 . 1 4 1 . 1 8 ta b l e 4 c o m p en sa t i n g t h e d e vice f o r t e m p era t ur e drift usin g ad j a / b allo ws f o r gr e a t f l exib i l i t y . i f th e user r e q u ir e s minim u m t e m p e r a t u r e d r i f t a t a g i ve n i n put p o we r or su b s e t of t h e dy na m i c ra n g e , t h e ad j a,b vol t age c a n b e s w e p t w h i l e mo nito r i ng ou t a , b ov e r t e mp e r atu r e . fi g u re 3 3 s h ow s a n e x a m p l e of th i s . t h e ad ja , b val u e wh e r e t h e o u t p u t d o es n o t ch a n g e is t h e v o l t a g e t h a t m u s t b e a p pl ied t o h a v e minim u m t e m p era t ur e d r i f t a t t h e g i ven p o we r and f r e q u e nc y . 1. 4 1. 45 1. 5 1. 55 1. 6 1. 65 1. 7 0 0 . 2 5 0 . 5 0. 75 1 1 . 2 5 1 . 5 1. 75 2 2 . 2 5 2 . 5 ad j a ( v ) outa (v ) 85c 65c 45c 25c 10c -4 0 c -2 0 c f i g u r e 33 . out a v s . a d j a o v e r t e mp . p i n= -3 0 d bm, 1 . 9 g h z th e ad j[a,b] in p u t h a s a high in p u t im p e da n c e . th e in p u t c a n b e co n v enien t l y driv en fr o m a n a t t e n u a t e d v a l u e o f vref , u s i n g a r e sis t o r d i vid e r . altering the slope n o n e o f t h e chan ges in op er a t i n g co ndi t i on s dis c uss e d s o fa r a f fe c t th e loga ri th m i c s l o p e , v slp , in e q ua t i o n 9. h o wev e r , this can r e adil y be al t e r e d b y co n t r o lli n g th e f r a c ti o n o f v o ut th a t i s f e d b a c k t o th e s e t p oin t in t e r f ace a t t h e v s et p i n. w h e n t h e f u l l sig n al f r o m v o u t is a p p l ie d t o v s et , th e s l op e assum e s i t s n o minal val u e o f 50 mv/db . i t ca n be in cr eased b y in c l udi n g a n a t t e n u a t o r bet w een t h e s e p i n s , a s shown i n f i g u re 3 4 . m o de r a tely l o w re s i st anc e v a l u e s shou l d b e u s e d t o mini mi ze s c a l in g er r o rs d u e t o t h e 70 k i n pu t r e sis t an ce a t t h e v s et p i n. k e ep in mind tha t this r e sis t o r s t r i n g als o lo ads th e o u t p u t , a n d i t ev e n t u all y r e d u ce s th e l o a d -d ri vi n g ca pa b i l i ti es i f v e r y lo w val u es a r e us e d . t o calc u l a t e t h e r e sis t o r val u es, us e 1 50 d ' s r2 r1 ( 1 7 ) w h er e s d is t h e desir e d slo p e, ex p r ess e d i n m v /db , and r2' is t h e val u e o f r2 in p a ral l e l wi t h 70 k. f o r exa m p l e , usin g r1 = 1.65 k an d r2 = 1.69 k (r2' = 1.649 k), th e n o minal s l o p e is in cr eas e d t o 100 mv/db . this c h o i ce o f s c aling is us ef u l wh en t h e o u t p ut is a pplie d to a dig i t a l vol t m e ter b e c a us e t h e displ a ye d n u m b er r e ads a s a de c i b e l qua n t i ty d i r e c t ly , wi t h o n ly a de c i ma l p o in t shif t. dec a in l a m r d n in l b in h b de c b ou t b vstb fb k b ou t n out p fb k a ou t a vsta in h a ch p a psa co m a vps r a c m b t em p a c m a c lpa ch p b vpsb c o m b ad j b ad j a vr e f vlv l c l p b co pw v tem p cha nne l a tru p wr ? v2 i bi a s v2 i ou t a ou t b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 cha n n e l b tr u p w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 r1 r2 vo u t f i g u re 34. e x ter n a l net w ork t o r a is e s l ope o p era t ion a t hi g h s l o p es is us ef u l w h e n a p a r t ic u l a r s u b - ra n g e o f t h e in p u t is m e a s ur e d i n g r e a t e r det a i l . h o we v e r , a m e a s ur e m en t r a n g e o f 60 db w o u l d co r r esp o nd to a 6 v cha n ge in v o ut a t this s l o p e , exceed ing th e ca p a c i ty of th e AD8364 s o u t p ut s t a g e w h en o p er a t in g on a 5 v s u p p l y . this r e q u ir es t h a t t h e i n t e r c e p t is r e p o si t i o n e d t o place t h e desir e d s u b-ra n g e wi t h in a win d ow co r r es p o nding t o a n o u t p u t r a n g e o f 0.2 v v o ut 4.8 v , a 46 db ra n g e . using the arr a nge m ent sh o w n in dec a l a m r d n l b h b de c b ou t b vs tb f bb ou t n ou t p f ba ou t a vs t a h a ch pa psa co m a v psr acm b t em p a c m a c l p a ch p b s b c o m b ad j b ad j a vre f vl vl clp b in co pw in in in v vp tem p ch a n n e l a tr u p w r ? v2 i bi a s v2 i out a out b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 c h a nne l b tr u p w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 v out r1 4.0 2 k o hms r2 4.3 2 k o hms r3 2k ohm s f i gur e 35, a n o u t p u t o f 0.5 v cor r es p o n d s t o t h e lo w e r en d o f t h e desir e d sub- r a n g e, a nd 4.5 v co r r esp o n d s to t h e u p p e r lim i t wi t h 3 db o f marg in a t each end o f th e ra n g e , w h ic h is n o minal l y 3 mv r m s t o 300 mv r m s, wi t h the in t e r c ep t a t 1.9 mv r m s. n o te t h a t r2 is conn e c t e d t o v r ef ra th er tha n g r o u n d . r3 is neede d t o en s u r e tha t t h e ad836 4 s r e f e r e n c e b u f f er , w h ich can sin k o n l y a s m al l c u r r en t, is co r r e c t l y l o ade d . i t i s ap p a r e n t t h at a v a r i a b l e a t t e nu at i o n f a c t o r b a s e d o n t h i s s c h e me co u l d pr o v ide a man u a l ad u st m e n t o f t h e slop e, b u t t h er e a r e fe w si t u a t ion s in w h ich t h is is o f va l u e . w h e n t h e slop e is ra is ed b y s o me fac t o r , th e lo op ca p a ci t o r , cl p f , s h o u ld be ra is e d b y t h e s a m e fac t o r t o en sur e s t a b i l i t y and t o p r es er v e a ch os en a v er a g ing t i me . th e s l op e can b e lo w e r e d b y placin g a t w o - re s i stor atte n u a t or af te r t h e output pi n , f o l l o w i n g st a n d a r d pr a c t i c e .
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 20 of 23 dec a in l a co m r pw d n in l b in h b de c b ou t b vs tb f bkb ou t n ou t p f bka ou t a vs t a in h a ch pa v psa co m a v psr acm b t em p a c m a c l p a ch p b vp s b c o m b ad j b ad j a vre f vl vl clp b tem p ch a n n e l a tr u p w r ? v2 i bi a s v2 i out a out b 25 1 2 3 4 5 6 13 15 14 16 12 11 10 9 8 7 24 23 22 21 20 19 17 18 c h a nne l b tr u p w r ? 2 2 2 2 3 3 3 6 7 8 9 0 1 2 v out r1 4.0 2 k o hms r2 4.3 2 k o hms r3 2k ohm s f i g u re 35. s c he me p r o v iding 1 00 mv / d b sl ope f o r o p er a t ion o v er a 3 mv t o 30 0 mv input r a ng e choos ing the right value for chpf and clpf the AD8364? s va r i a b le ga in am p l if ier in c l udes a n o f fs et can c e l l a tio n lo o p , w h ich i n t r o d uces a hig h -p as s f i l t er ef fe c t i n i t s t r an sfer f u nc t i o n . t h e c o r n e r f r e q u e nc y , f hp , o f this f i t er m s t e e o tha t o f th e o e s t in p t sig n a in the desir e d m e as rem en t a n d id t h f r e en t o p r o p er m e as r e t h e am pi t de of t h e in p t sig n a the r e ir e d a e of t h e ext e r n a a p a i t o r is g i e n hz in f f b a chp hp hp u u s 2 f 200 ] , [ (18) th us, f o r o p era t io n a t f r eq uen c ies do wn t o 100 kh z, chp[a,b] s h o u ld b e 318 pf . i n t h e st anda r d co nne c t io n s fo r t h e m e asur e m e n t m o d e , t h e vs t [ a , b ] p i n is tied t o ou t[a,b] . f o r smal l c h a n g e s in in p u t a m p l i t ud e (a f e w d e ci b e ls), th e ti m e - d o m a i n r e s p o n s e o f th i s loo p i s es s e n t ial l y lin e ar wi t h a 3 db lo w-p a s s co r n er f r eq uen c y o f nom i n a l l y f lp 1(2 lp[a, b] 11 ) i n t e r n a time de a s a r o n d this o a o o p s e t th e minim m r e o mm e n de d a e of this a p a i t o r t o ao t 300 pf , main g f lp 482 h f o r o p era t io n a t o e r sig n a f r e en ies, o r h ene er t h e a era g in g t i me n e e d s t o e o n g er , s e hz in f f b a clp lp lp u u s 2 f 900 ] , [ (19) w h en t h e i n p u t sig n al exhi b i ts l a rg e cr es t fac t o r s, s u ch as a w c d m a sig n al , clp[a,b ] m s t e m h a r g e r t h a n m i g h t a t f i rst s e em n e ess a r this is d e t o t h e p r es e n e o f sig n if ia n t o f r e en o m p o n e n ts in t h e o m p ex , ps edo -r a ndo m m o d a t i o n , hi h genera t e s f t a t ion s in th e o t p t o f the AD8364
preliminary technical data AD8364 rev. prc page 21 of 23 table 5 evaluation board configuration options component function/notes part number default value t1, t2 the dynamic range of the AD8364 is directly related to the magnitude and phase balance of the balun feeding the rf signal to the part. the evalu ation board includes m/a-com mabaes0031 solderd to the board and two unsoldered m/a-com etc1.6-4-2-3. the mabaes0031 has good magnitude and phase balance between 10mhz and 500mhz, then slowly degrades above 500mhz. the performance of the evaluation board will be degraded above 500 mhz due to the balu n. the m/a-com etc1.6-4- 2-3 broadband baluns allows limited dynamic range performance between 500 ? 2500 mhz. better dynamic range can be achieved by using narrow band baluns with better magnitude and phase performance. m/a-com mabaes0031 c11, c13, c21 supply filtering/de coupling capacitors 0.1 f c10, c12,c20 supply filtering/de coupling capacitors 100 pf c19 vref filtering/decoupling capacitors 0.1 f c18 vlvl filtering/decoup ling capacitors tbd c15, c17 output low-pass filter capacitors 0.1 f c14, c16 output low-pass filter capaci tors, can be activated by removing jumpers r15 and r6 0.1 f c23, c24 input bias-point decoupling capacitors 100 pf c1, c8 input bias-point decoupling capacitors 0.1 f c2, c3, c4, c5, c6, c7 input signal coupling capacitors 0.1 f c9, c22 input high-pass filter capacitor 0.1 f dut AD8364 AD8364xcp r4, r5, r6, r9, r12, r15, r17, r19, r21, r24, r23, jumpers 0 r10, r11 capacitors can be inst alled for controller mode r2, r13, r16, r18, r20 optional pull-down resistors 10 k/open r1, r3 100 resistor to be added wh en input coupling from a single-ended source (not installed) 100 r14 to be added for use in slope adjustment (not installed) sw1 power-down/enable or external power-down selector sw2, sw3 measurement mode/controller mode selector sw4 vlvl vref/external controll selector sw5 adja vref/external controll selector sw6 adjb vref/external controll selector
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 22 of 23 e v al ua tion b o ar d (10mh z ? 5 0 0 mhz) 24 23 22 21 20 19 18 17 de cb in h b in l b co mr pw d n in l a in h a de ca 25 26 27 28 29 30 31 32 ch pb vp s b co mb adj b a d j a vr e f v l vl cl p b 16 15 14 13 12 11 10 9 vs t b out b fb k b out n out p fb k a out a vs t a chp a vp sa co m a vp s r ac m b t e mp ac ma c l p a 1 2 3 4 5 6 7 8 ad 8 3 6 4 ac pz 1: 4 c2 0. 1u f c3 0. 1u f c4 0. 1u f vpo s c1 0. 1uf c8 0. 1 p c6 0. 1u f c7 0. 1u f t2 m aba es 0 0 3 1 sw 3 a b r1 1 0 r e f l e vel vo l t ag e j1 1 vp os tp 1 vp o s co m m tp 2 inp b j1 in p a j3 pw d n j2 te m p se ns or j4 set p o in t vo l t ag e a j5 set p o in t vo l t a g e b j10 ou t p u t vo l t ag e a j6 ou t p u t vo l t a g e b j9 di f f o u t + j7 di f f ou t - j8 c9 0. 1u f c2 2 0. 1 u f c1 0 100 p c1 2 10 0 p f c1 1 0. 1 p c1 3 0. 1uf c1 4 0. 1 u f c1 6 0. 1 u f c1 8 tb d c2 1 0. 1 p c2 0 10 0p r2 10 k r4 0 r5 0 r9 0 r1 0 0 r1 2 0 r1 7 0 r2 1 0 sw 1 a b sw 2 sw 4 a b ab r3 o pen r1 o pen a b r1 9 0 a b ad ja j1 2 ad jb j1 3 r1 8 op e n r2 0 op e n sw 5 sw 6 c1 5 0. 1uf c1 7 0. 1u f r1 5 0 r6 0 c1 9 0. 1 p r1 3 o pen vr e f vr ef r1 4 ope n r1 6 op e n 1: 4 c5 0. 1u f c2 4 100 pf r2 4 0 c2 3 10 0p f r2 3 0 t1 m aba es0 0 3 1 ex p o s e d p a d d l e f i g u re 36. ev aluat i on b o a r d
prelimi n ar y techni cal da t a AD8364 rev. pr c pag e 23 of 23 f i g u re 37. p a ckag e ordering guide model temperature r a nge package descri ption package option AD8364xcp ?40c to +85c 32-lead lfcsp a d 8 3 6 4 - e v a l e v a l u a t i o n boar d

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