north america: tel. (800) 366-2266, fax (800) 618-8883 asia/pacific: tel.+81-44-844-8296, fax +81-44-844-8298 europe: tel. +44 (1344) 869 595, fax+44 (1344) 300 020 specifications subject to change without notice. visit www.macom.com for additional data sheets and product information. v 4.0 features ? single voltage control 0 to -3 volts ? 25 db attenuation range at 0.9 ghz ? low dc power consumption ? low cost sot-25 plastic package ? tape and reel packaging available sot-25 electrical specifications: t a = +25c 1 = == = parameter test conditions units min. typ. max. insertion loss dc - 2.0 ghz db 3.6 4.2 attenuation dc - 1.0 ghz db 23 25 1.0 - 2.0 ghz db 18 20 flatness (peak-to-peak) dc - 1.0 ghz db 7 10 1.0 - 2.0 ghz db 5 8 vswr dc - 2.0 ghz 3:1 t rise , t fall 10% to 90% rf, 90% to 10% rf ns 10 t on , t off 50% control to 90% rf, control to 10% rf ns 20 t ransients in-band mv 10 description m/a-com?s at-255 is a gaas mmic voltage variable absorptive attenuator in a low cost sot-25 surface mount plastic package. the at-255 is ideally suited for use where variable attenuation fine tuning and very low power consumption are required. typical applications include radio, cellular, gps equipment and automatic gain/level control circuits. the at-255 is fabricated using a mature 1-micron gaas mesfet process. the process features full chip passivation for increased performance and reliability. ordering information part number package at-255 sot-25 plastic AT-255TR forward tape and reel 1 1. reference application note m513 for reel size information. 1. all measurements at 1 ghz in a 50 ? system unless otherwise specified. insertion loss varies 0.003 db/c. inches millimeters dim min max min max a .106 .122 2.70 3.10 b .100 .118 2.54 3.00 c ? .051 ? 1.30 d .063 ref. 1.60 ref. e .032 .043 .80 1.10 f .014 .020 .35 .50 g .003 ? .08 ? h .000 .006 .00 .15 j .018 ref. .45 ref note: 1. leads coplanarity should be 0.003 (0.08) max. at-255 3volt voltage variable attenuator 25 db, dc - 2.5 ghz 1
north america: tel. (800) 366-2266, fax (800) 618-8883 asia/pacific: tel.+81-44-844-8296, fax +81-44-844-8298 europe: tel. +44 (1344) 869 595, fax+44 (1344) 300 020 specifications subject to change without notice. visit www.macom.com for additional data sheets and product information. v 4.0 0 5 10 15 20 25 30 -3 -2 -1 0 control voltage (volts) compression point (dbm) 50mhz 500mhz input ip3 vs control voltage 0 5 10 15 20 25 30 35 40 45 -3 -2 -1 0 control voltage (volts) ip3 (dbm) 500 mhz 50mhz -35 -30 -25 -20 -15 -10 -5 0 00.511.522.53 frequency ( ghz ) attenuation(db) q -25 -20 -15 -10 -5 0 -3 -2 -1 0 control voltage (volts) return loss (db) -4 -3 -2 -1 0 01234 frequency(ghz) attenuation(db) -35 -30 -25 -20 -15 -10 -5 0 -3 -2 -1 0 control voltage (volts) attenuation (db) 2.5ghz 1.0ghz 50mhz typical performance curves relative attenuation vs. control voltage insertion loss vs. frequency maximum relative attenuation vs. frequency return loss vs. control @ 900 mhz functional schematic 1 parameter absolute maximum maximum input power +21 dbm control voltage v c -8v, +0.5v operating temperature -40c to +85c storage temperature -65c to +150c absolute maximum ratings 1 1. exceeding any one or a combination of these limits may cause permanent damage. 1. v cc = 0 v dc to -3 v dc @ 50 a max. input ip3 vs. control voltage input p1db vs. control voltage 5 4 1 3 2 rf gnd vc rf gnd 2 3 volt voltage variable attenuator, 25 db, dc - 2.5 ghz at-255
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