a s12 28 pin ssop p ackage features applica tions ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 low cost integrated monolithic gaas amplifier and step attenuator with output disconnect switch. meets docsis distortion requirements at +60 dbmv frequency range: 5 ? 100 mhz attenuation range: 0 ? 56 db, variable in 4 db steps 5 volt operation low distortion & low noise figure mcns/docsis compliant cable modems catv interactive set-top box telephony over cable systems description the ARA1400S12 is a gaas ic designed to perform the reverse path amplification and output level control functions in a catv set-top box or cable modem. it incorporates a digitally controlled precision step attenuator that is preceded by an ultra low noise amplifier stage, and followed by an ultra-linear output driver amplifier. it is capable of meeting the mcns/docsis harmonic distortion specifications while only requiring a single polarity +5v supply. this part is a single ended design that does not require an output balun to achieve ?52 dbc 2 nd harmonic performance at +60 dbmv output levels. both the input and output are matched to 75 ohms. the precision attenuator provides up to 56 db of attenuation in 4 db increments. the ARA1400S12 is supplied in a 28-pin ssop package featuring a thermal heat slug on the bottom of package. soldering this heat slug to the ground plane of the pc board ensures the lowest possible thermal resistance for the device resulting in a long mtf. v d d ) 7 1 , 2 1 , 4 s n i p (9c d v v n i f r ) 6 2 , 0 1 s n i p (3 - o t 0c d v t t a n i t t a ) 3 ( t u o v ) 8 2 (5c d v v t e s i ) 7 2 , 1 1 s n i p (2c d v * ) 6 2 , 0 1 s n i p ( e g a t l o v t u p n i f r 0 6 +v m b d e r u t a r e p m e t e g a r o t s0 0 2 + o t 5 5 -c e r u t a r e p m e t g n i r e d l o s0 6 2c e m i t g n i r e d l o s5c e s e r u t a r e p m e t e s a c g n i t a r e p o5 8 + o t 0c absolute maximum ratings parameter parameter 1 28
a 2 ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 notes: 1. as measured in anadigics test fixture 2. at +60 dbmv output level into 75 ohm load electrical characteristics (typical) (v dd =5 v dc , t c =25 c) r e t e m a r a pn i mp y tx a mt i n us t n e m m o c n i a g 1 0 32 33 3b d n o i t a u n e t t a b d 0 t a g n i t t e s s s e n t a l f n i a g 1 -5 7 . 0-b dz h m 0 0 1 o t 5 p m e t r e v o n o i t a i r a v n i a g-6 0 0 . 0 --c / b d s p e t s n o i t a u n e t t a 1 b d 4 b d 8 b d 6 1 b d 2 3 6 . 3 7 . 7 3 . 5 1 0 . 1 3 9 . 3 0 . 8 7 . 5 1 5 . 1 3 2 . 4 3 . 8 1 . 6 1 0 . 2 3 b d 2 d n l e v e l n o i t r o t s i d c i n o m r a h 2 z h m 0 1-7 5 -2 5 -c b dv m b d 0 6 + t a 3 d r l e v e l n o i t r o t s i d c i n o m r a h 2 z h m 0 1-4 6 -6 5 -c b dv m b d 0 6 + t a 3 d r t n i o p t p e c r e t n i t u p t u o r e d r o8 7-- v m b d t n i o p n o i s s e r p m o c n i a g b d 10 7- v m b d e r u g i f e s i o n-7 . 15 . 2b d r e w o p e s i o n t u p u o g n i t t e s . n t t a n i m / l a n g i s o n / e v i t c a g n i t t e s . n t t a x a m / l a n g i s o n / e v i t c a - - - - 6 . 4 2 - 6 . 1 4 - v m b d z h k 0 0 2 3 y n a m o r f h t d i w d n a b z h m 2 4 - 5 z h m 5 4 t a n o i t a l o s i h c t i w s-5 30 3b d t u p t u o n i e c n e r e f f i d n e e w t e b l e v e l l a n g i s y b d n a t s d n a e v i t c a e c n a d e p m i t u p n i 1 -5 7- m h o s s o l n r u t e r t u p n i 1 -0 2 -5 1 -b d e c n a d e p m i t u p t u o 1 -5 7- m h o s s o l n r u t e r t u p t u o 1 -0 2 -5 1 -b dd e l b a n e x t s s o l n r u t e r t u p t u o 1 -2 1 -0 1 -b dd e l b a s i d x t c i g o l l o r t n o c h c t i w s t u p t u ol i v h i v 0 8 . 2 - - 1 v d d v v ) n e p o ( ) d e s o l c ( e c n a d e p m i l o r t n o c h c t i w s t u p t u o-k 0 1-m h o v 1 d d v , 2 d d -57v v d d l a t i g i d-5-v n w o d t u h s v5 . 1 --2 -v i 1 d d -4 75 9a m i 2 d d -8 0 10 3 1a m i d d l a t i g i d-2 10 2a m n o i t p m u s n o c r e w o p-7 9 . 03 2 . 1w c i g o l l o r t n o c r o t a u n e t t a 4 l i v h i v 0 7 . 2 - - 5 . 0 5 . 6 s t l o v d e l b a s i d . n t t a d e l b a n e . n t t a e c n a d e p m i l o r t n o c r o t a u n e t t a-k 5-m h o
3 a ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 pa pa attn 4/8/16/32 db lpf upstream qpsk/ 16-qam modulator mac qam receiver w/fec saw double conversion tuner microcontroller w/enet mac ram rom 10base-t tranceiver diplex filter ara1400 reverse amp switch 54-860 mhz gain control clock clock data data rj45 connector coax connector balun 45 mhz if tx enable/disable figure 1: cable modem or interactive set-top box block diagram figure 2 rf out1 rf in2 iset1 32 db 16 db 8 db 4 db iset2 rf in att in att out amp rf out amp 56 db 4 db step digital attenuator section tx
a 4 ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 reverse amp .1uf vdd1 0.1uf .1uf rf in gnd gnd 20 w 1uf .1uf 600 w 5k .1uf 3.9 w 1uf gnd 1uf 1.8k gnd 3.3k 10uh 1uf gnd 1uf gnd 0.1uf gnd gnd 1uf .1uf 20 w 1uf .1uf 1.8k 10uh .01uf .1uf gnd 3.3k rf out vdd2 8 db 4 db 16 db 5v digital 32 db 1uf 1pf 620 w 5k gnd gnd gnd gnd gnd 1uf .01uf gnd output switc h control ara1400 10k 5k 5k 0.1uf shutdown #2 0.1uf shutdown #1 5k +5v sw4 sw3 sw2 sw1 test circuit dip switch logic t able f o = open (0 vdc) x = closed (+5 vdc) ) b d ( n t t a 48 2 16 10 24 28 22 36 30 44 48 42 56 50 6 1 w s xoxoxoxoxoxoxox 2 w s oxxooxxooxxooxx 3 w s oooxxxx oooo xxxx 4 w s ooooooo xxxxxxxx
5 a ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 package diagram
a 6 ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 pin description n i pn o i t c n u fn o i t p i r c s e d 1d n g g i dd n u o r g l a t i g i d 2c n 3t t a n i t u p n i r o t a u n e t t a 4f r 1 t u o v + 1 d d t s 1 r o f y l p p u s v 5 + d n a t u p t u o f r e g a t s r e i f i l p m a 5v 1 f e r r e i f i l p m a t s 1 r o f e g a t l o v e c n e r e f e r 9 , 8 , 7 , 61 d n g _ c a . t i b r o t a u n e t t a b d 2 3 r o f d n u o r g c a c a y l l a n r e t x e e b t s u m s n i p e s e h t d e l p u o c e d 0 1f r n i & e g a t s r e i f i l p m a t s 1 o t t u p n i f r r e i f i l p m a t s 1 r o f n i p n w o d t u h s 1 1i 1 t e s t s 1 r o f t n e r r u c t e s r o t s i s e r r e i f i l p m a 2 1l a t i g i d v 5e g a t l o v y l p p u s l a t i g i d s t l o v 5 3 1b d 2 3 l e l l a r a p l o r t n o c r o t a u n e t t a b d 2 3 t u p n i a t a d 4 1b d 6 1 l e l l a r a p l o r t n o c r o t a u n e t t a b d 6 1 t u p n i a t a d 5 1b d 8 l e l l a r a p l o r t n o c r o t a u n e t t a b d 8 t u p n i a t a d 6 1b d 4 l e l l a r a p l o r t n o c r o t a u n e t t a b d 4 t u p n i a t a d 7 1v 2 d d e g a t s r e i f i l p m a d n 2 r o f y l p p u s v 5 + 8 1r 2 f e r r e i f i l p m a d n 2 r o f e g a t l o v e c n e r e f e r 9 1f r t u o h c t i w s m o r f t u p t u o f r 3 2 , 2 2 , 1 2 , 0 22 d n g _ c a b d 6 1 , 8 , 4 r o f d n u o r g c a e b t s u m s n i p e s e h t . s t i b r o t a u n e t t a . d e l p u o c e d c a y l l a n r e t x e 4 23 d n g _ c a e s e h t . h c t i w s t u p t u o r o f d n u o r g c a c a y l l a n r e t x e e b t s u m s n i p . d e l p u o c e d 5 2x tl o r t n o c h c t i w s t u p t u o 6 2f r 2 n i d n a e g a t s r e i f i l p m a d n 2 o t t u p n i f r r e i f i l p m a d n 2 r o f n i p n w o d t u h s 7 2i 2 t e s d n 2 r o f t n e r r u c t e s r o t s i s e r x a m r o f d n u o r g ( r e i f i l p m a ) e c n a m r o f r e p 8 2t t a t u o t u p t u o r o t a u n e t t a
7 a ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 notes
a 8 ARA1400S12 catv reverse amplifier with step attenuator advanced product information rev. 2 important notice anadigics, inc. reserves the right to make changes to its products or discontinue any product at any time without notice. the advanced product data sheets and product specifications contained in this data sheet are subject to change prior to a products formal introduction. the information in this data sheet has been carefully checked and is assumed to be reliable. however, anadigics assumes no responsibility for inaccuracies. anadigics strongly urges customers to verify that the information they are using is current before placing orders. warning anadigics products are not intended for use in life support appliances, devices, or systems. use of an anadigics product in any such application without written consent is prohibited. a anadigics, inc. 35 technology drive warren, new jersey 07059 tel: (908) 668-5000 fax: (908) 668-5132 http://www .anadigics.com mktg@anadigics.com
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