? 2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 1 california micro devices PACAC p/active ac termination network features ? high frequency performance ? miniature qsop package ? 18 terminating lines/package ? stable resistor-capacitor network schematic configuration product description note: camd?s p/active ac integrated resistor-capacitor termination network is an upgraded version of the original prc202/212 series. PACAC provides 2kv esd protection, minimized lead inductance and parasitic capacitive effects (with added ground pins), improved termination characteristics, and frequency response at high data transmission rates. the PACAC is recommended for all new designs. this integrated thin film resistor-capacitor network is designed to eliminate transmission line effects on high speed data lines. incorporating camd?s p/active ac integrated resistor-capacitor termination network will result in improved board yields and reliability, minimized space and routing problems on the board, and reduced assembly costs. this highly integrated network requires no dc power dissipation. why p/active termination networks? a terminating rc is used to reduce or eliminate reflections on a transmission line. it can perform this function only when its impedance value matches the characteristic impedance of the transmission line across a broad frequency spectrum. passive components affect the electrical performance of electronic systems. in reality, every resistor has some parasitic series inductance and a parasitic capacitance; and every capacitor has both series resistance and inductance. at low speeds, these parasitics do not affect the performance of resistors and capacitors. however, at higher speeds, these parasitics cause mismatch in a termination. to prevent these problems in high speed digital designs, a designer must take special care in selecting passive components or networks. the PACAC family of devices provides consistent and predictable behavior over a higher frequency range than discrete components or any previous network products. *maximum frequency where the real part of the impedance of the ac termination is within 10% tolerance of the designed resistance r. 20 21 22 23 24 19 18 17 16 15 14 13 1234567 8910 12 11 refer to ap-201 termination application note for further information. applications ? ac termination ? low pass filtering c0840400 s n o i t a c i f i c e p s d r a d n a t s ) r ( e c n a r e l o t e t u l o s b a% 0 1 ) c ( e c n a r e l o t e t u l o s b a% 0 1 e g n a r e r u t a r e p m e t g n i t a r e p oc 0 7 o t c 0 ) t i u c r i c t x e t e e s ( k l a t s s o r c) l a c i p y t ( % 5 < r o t s i s e r / g n i t a r r e w o pw m 0 0 1 p m a l c d s e p m a l c e v i t i s o p p m a l c e v i t a g e n v 6 > v 6 - < n o i t c e t o r p d s e ) 5 1 0 3 d o h t e m , 3 3 8 - d t s - l i m r e p (v k 2 > e r u t a r e p m e t e g a r o t sc 0 5 1 o t c 0 6 - g n i t a r r e w o p e g a k c a p. x a m , w 0 0 . 1 d r a d n a t s s e u l a v ( r w )) f p ( c @ * x a m f % 0 1 r e m i t ) s n ( t n a t s n o c e d o c c r 3 37 4z h g 1 5 5 . 10 7 4 / 0 3 3 7 47 4z h g 1 1 2 . 20 7 4 / 0 7 4 7 43 3z h g 1 5 5 . 10 3 3 / 0 7 4 5 70 5z h g 1 5 7 . 30 0 5 / 0 5 7 0 0 10 0 1z h g 10 . 0 11 0 1 / 1 0 1
?2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 2 california micro devices PACAC 20 21 22 23 24 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 12 11 pulse generator 0to5volt 10 mhz > 1ns rise/fall time to all terminations except victim line to victim line victim voltage test point 50 w crosstalk test circuit (t a =25 o c) n o i t a m r o f n i g n i r e d r o t r a p d r a d n a t s e g a k c a pr e b m u n t r a p g n i r e d r o e d o c c r s n i pe l y t ss e b u tl e e r & e p a tg n i k r a m t r a p 0 7 4 / 0 3 34 2p o s qt / q a 0 7 4 / 0 3 3 c a pr / q a 0 7 4 / 0 3 3 c a pq c a 0 7 4 / 0 3 3 c a p 0 7 4 / 0 7 44 2p o s qt / q a 0 7 4 / 0 7 4 c a pr / q a 0 7 4 / 0 7 4 c a pq c a 0 7 4 / 0 7 4 c a p 0 3 3 / 0 7 44 2p o s qt / q a 0 3 3 / 0 7 4 c a pr / q a 0 3 3 / 0 7 4 c a pq c a 0 3 3 / 0 7 4 c a p 0 0 5 / 0 5 74 2p o s qt / q a 0 0 5 / 0 5 7 c a pr / q a 0 0 5 / 0 5 7 c a pq c a 0 0 5 / 0 5 7 c a p 1 0 1 / 1 0 14 2p o s qt / q a 1 0 1 / 1 0 1 c a pr / q a 1 0 1 / 1 0 1 c a pq c a 1 0 1 / 1 0 1 c a p
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