v 3 .00 features l 35 db voltage variable attenuation @ 1 ghz l single voltage control 0 to -4 volts l low dc power consumption: 10 mw l nanosecond switching speed l t emperature range: -40?c to +85?c l low cost soic14 plastic package l t ape and reel packaging available 1 description m/a-com s at-635 is a gaas mmic voltage variable absorptive attenuator in a low cost soic 14-lead surface mount plastic pack- age. the at-635 is ideally suited for use where attenuation fine tuning, fast switching and very low power consumption are r e q u i r ed. typical applications include radio, cellular, gps equip- ment and other automatic gain/level control cir c u i t s . the at-635 is fabricated with a monolithic gaas mmic using a m a t u r e 1-micron process. the process features full chip passiva- tion for increased per f o r mance and r e l i a b i l i t y . v o l t a ge v a r i a b le absorptive atten u a t o r , 35 db dc - 2 ghz at-635 s o - 1 4 parameter test conditions 2 unit min. typ. max insertion loss dc ?0.1 ghz db 6.5 6.7 dc ?0.5 ghz db 6.7 7.0 dc ?1.0 ghz db 7.2 7.4 dc ?2.0 ghz db 7.5 7.8 flatness dc-2 ghz 10 db attenuation db +/-1.0 +/-1.3 (peak to peak) 20 db attenuation db +/-1.2 +/-1.5 30 db attenuation db +/-1.2 +/-1.5 vswr 2.0:1 trise, tfall 10% to 90% rf, 90% to 10% rf ns 2 ton, toff 50% control to 90% rf, 50% control to 10% rf ns 4 transients in band mv 30 power linear operation dbm 13 handling absolute max input power dbm 21 measured relative 0.05 ghz dbm 34 ip 2 to input power 0.5 ?2.0 ghz dbm 47 (for two-tone input power up to +5 dbm) measured relative 0.05 ghz dbm 18 31 (3) ip 3 to input power 0.5 ?2.0 ghz dbm 18.5 36 (3) (for two-tone input power up to +5 dbm) electrical specifications, t a = +25? 1.refer to ?ape and reel packaging?ection, or contact factor y. 2.all measurements at 1 ghz in a 50 w system, unless otherwise specified.the a control voltage 0 to -4 volts @ 20 ? typ . 3. for levels above 6 db attenuation. for lev els below 6 db, the minimum specification numbers apply . ordering information part number package a t - 63 5 pin soic 14-lead plastic package a t - 6 35 tr f orward t ape & reel
v 2.00 v olta ge v ariable absorptive attenuator , 35 db at -635 functional sc h e m a t i c absolute maximum ratings 1 1.operation of this device abo v e any one of these parameters ma y cause permanent damage . p arameter absolute maximum max. input p ow er +21 dbm control v oltage +5 v , -8.5 v operating t emperature -40? to +85? storage t emperature -65? to +150? pin configuration pin no. description 1 a 2 gnd 3 gnd 4 gnd 5 gnd 6 gnd 7 gnd pin no. description 8 rf2 9 gnd 10 gnd 11 gnd 12 gnd 13 gnd 14 rf1 typical p e r fo r m a n c e
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