A n d p r o v i d e s a g o o d m a t c h a v s w r o

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Unformatted text preview: S O P P W T 1 9 0 0/ D C T 1 9 0 0 D C S 1 8 0 0/P C S 1 9 0 0 P H S/P A C S DECT ________________F u n c tio n a l Di a gr a m LNAOUT __________________Pin C o nfig ur a tio n T OP V I E W RXMXIN GND 1 LNAIN 2 LN A I N IF IF GND 3 20 GND 19 LNAOUT 18 GND MA X2406 ________________G e n e r a l D e s c rip tio n L o w -C o s t D o w n c o n v e r t e r w i t h L o w -N o i s e A m p lifi e r R F BP F VCC VCC LNAOUT R F BP F RX MIXER LNAIN I F BP F IF LNA M A T CH IF OUT IF MAX2406 LO BU F F ER BIAS CONTROL RXEN L O p o rt i s i n t e r n a l l y t e r m i n a t e d t o 5 0 ! a n d p r o v i d e s a g o o d m a t c h ( a V S W R o f a p p ro x i m a t e l y 1 . 2 : 1 t o 2 G H z , a n d a V S W R o f a p p ro x i m a t e l y 2 : 1 t o 3 G H z ). Layout A p r o p e rl y d e s i g n e d P C b o a r d i s a n e s s e n t i a l p a rt o f a n y R F / m i c r o w a v e c ir c u i t . B e s u r e t o u s e c o n tr o l l e d i m p e d a n c e l i n e s o n a l l h i g h -fr e q u e n c y i n p u t s a n d o u t- LO SOURCE F or t h e p o w e r s u p p li e s , a s t a r t o p olo g y w ork s w e ll. E a c h V C C n o d e i n t h e c ir c u i t h a s i t s o w n p a t h t o a c e n tr a l V C C a n d a d e c o u p l i n g c a p a c i t o r t h a t p r o v i d e s l o w i m p e d a n c e a t t h e R F fr e q u e n c y o f i n t e r e s t . T h e c e n tr a l V C C n o d e h a s a l a r g e d e c o u p li n g c a p a c it or a s w e ll . T h i s p ro v i d e s g o o d i s o l a ti o n b e t w e e n t h e d if f e r e n t s e c tio n s o f t h e M A X 2 4 0 6 . T h e M A X 2 4 0 6 E V k it l a y o u t c a n b e u s e d a s a g ui d e to int e g r a tin g th e M A X 2 4 0 6 into MA X2406 ____________________________________Ty pi c a l A p pli c a tio n F u n c tio n a l Di a gr a m a n e x t e r n a l m a t c h i n g c ir c u i t . T h e T y p i c a l O p e r a t i n g C h a r a c t e ri s t i c s p r o v i d e p o rt-i m p e d a n c e d a t a v s . fr e q u e n c y f or u s e i n d e s i g n i n g a m a t c h i n g n e t w ork . T h e a c r o s s I F a n d IF ( i n d i f f e r e n t i a l a p p l i c a t i o n s ) c a n b e u s e d to s e t th e I F im p e d a n c e . VCC VCC 47p F 220pF LO INPUT DI F F E R E NT I A L LNA INPUT 7 8 LO LO 220pF DIF FERENTIAL LO OPERATION R E CE I V E MIXER INPUT 2 5 VCC 9 VCC LNAOUT LNAIN 19 220pF *1pF R E CE I V E R ENABLE LO INPUT (SINGLE-ENDED) 220pF 4 . 7n H 1p F 6 7 220pF 8 16 LNA OUTPUT V CC MAX2406 1000pF RXEN LCHOKE R* LO IF 13 LO RXMXIN GND IF 14 M A T CH 1000pF V CC 1000pF IF IF OUTPUT (SINGLE-ENDED) 14 1 , 3 , 4 , 10 , 11 , 12 , 15 , 17 , 18 , 20 1000pF LCHOKE R* VCC 1000pF M A T CH 220pF 47pF IF OUTPUT DIF FERENTIAL LCHOKE 1000pF IF *OPTIONAL 13 DIF FERENTIAL IF OPERATION F i g u r e 1 . M A X 2 4 0 6 T y p i c a l O p e r a t i n g C ir c u i t 6 _______________________________________________________________________________________ R X E N I n p u t B i a s C u rr e n t RX E N = 2.0V 0.1 S u p p l y C urr e n t , S h u t d o w n M o d e 30 mA 0.1 RX E N = G N D , V C C = 3.0V µA 20 S u p p l y C urr e n t , R e c e i v e M o d e 1.0 10 µA UNITS AC ELECTRICAL CHARACTERISTICS (M A X 2 4 0 6 E V K IT , R e v . B , V C C = 3 . 0 V , R X E N = V C C , ƒ L O = 1 . 5 G H z , ƒ L N A I N = ƒ R X M XI N = 1 . 9 G H z , P L N A I N = -3 0 d B m , P R X M XI N = -2 1 . 5 d B m , P L O = -1 0 d B m , d i f f e r e n t i a l I F o p e r a t i o n , 5 0! s y s t e m , T A = + 2 5° C , u n l e s s o t h e rw i s e n o t e d .) PARAMETER L N A G a i n ( N o t e 1) CONDITIONS MIN TYP MAX T A = + 2 5° C 13.6 16 17.6 T A = T MI N t o T M A X 12.2 L N A N o i s e F i g ur e L N A In p u t IP 3 dB 2.5 7.4 T A = T MI N t o T M A X d Bm -5 . 6 T A = + 2 5° C dB -9 . 5 ( N o t e 2) L N A O ut p ut 1 d B C o m p r e s sio n M i x e r C o n v e rs i o n G a i n ( N o t e 1) 18.8 d Bm 8.4 6.2 9.0 10.2 dB M i x e r N o i s e F i g ur e Sin g l e si d e b a n d 9.1 dB M i x e r In p u t IP 3 ( N o t e 3) 4.5 d Bm -7 d Bm M i x e r In p u t 1 d B C o m p r e s s i o n Mix e r O ut p ut F r e q u e n c y ( N o t e s 1 a n d 4) 450 MH z R e c e i v e r T urn- O n T i m e ( N o t e s 1 a n d 5) 0.5 2.5 µs M i n i m u m L O D ri v e L e v e l ( N o t e 6) -1 7 d Bm L O to L N AIN L e a k a g e R X E N = h i g h or l o w -4 9 d Bm G u a r a n t e e d b y d e s i g n a n d c h a r a c t e ri z a t i o n . 1 . 9 G H z a n d 1 . 9 0 1 G H z t o n e s a t -3 0 d B m p e r t o n e . 1 . 9 G H z a n d 1 . 9 0 1 G H z t o n e s a t -2 1 . 5 d B m p e r t o n e . M i x e r o p e r a t i o n i s g u a r a n t e e d t o t h i s fr e q u e n c y . F o r o p t i m u m g a i n , a d j u s t I F o u t p u t m a t c h . S e e t h e I F O u t p u t I m p e d a n c e ( s i n g l e e n d e d ) v s . F r e q u e n c y g r a p h i n t h e T y p i c a l O p e r a t i n g C h a r a c t e ri s t i c s . Note 5: T i m e fro m R X E N = l o w t o R X E N = h i g h , u n t il t h e c o m b i n e d r e c e i v e g a i n i s w i t h i n 1 d B o f i t s f i n a l v a l u e . M e a s ur e d w i t h 4 7 p F b l o c k i n g c a p a c it ors o n L N A I N a n d L N A O U T . Note 6: A t t h i s L O d ri v e l e v e l , t h e m i x e r c o n v e rs i o n g a i n i s t y p i c a ll y 1 d B l o w e r t h a n w i t h -1 0 d B m L O d ri v e . Note 1: Note 2: Note 3: Note 4: 2 _______________________________________________________________________________________...
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