digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 2 ghz at - 283 cr - 12 v 5.00 electrical specifications 1 : t a = 25 c features n attenuation: 0.5 db steps to 15.5 db 2 n temperature stability: 0.18 db from ? 55c to +85c typical n low dc power consum ption n hermetic surface mount package n integral ttl driver n 50 o nominal impedance description m/a - com?s at - 283 is a gaas fet 5 - bi t digital attenuator with a 0.5 db minimum step size and 15.5 db total attenuation. this attenuator and integral ttl driver is in a hermetically sealed ceramic 16 - lead surface mount package. the at - 283 is ideally suited for use where accuracy, fast switching, very low power consumption and low intermodulation products are required. typical applications include dynamic ran ge setting in precision receiver circuits and other gain/leveling control circuits. environmental screening is available. cont act the factory for information. parameter test conditions units min typical max reference insertion loss dc - 0.5 ghz dc - 1.0 ghz dc - 2.0 ghz db db db ? ? ? ? ? ? 2.2 2.5 2.9 attenuation accuracy 3 any single bit dc - 2.0 ghz any combination of bits dc - 2.0 ghz (0.25 +3% of attenuation setting in db) db (0.25 +3% of attenuation setting in db) db or 0.4 db, whichever is greater vswr dc - 1.0 ghz dc - 2.0 ghz ? ? ? ? ? ? 1.6:1 1.7:1 trise, tfall ton, toff transients 10% to 90% 50% control to 90/10% rf in - band (peak ? peak) ns ns mv ? ? ? 10 27 22 ? ? ? 1 db compression 4 input power 0.05 ghz input power 0.5 - 2.0 ghz dbm dbm ? ? +20 +28 ? ? input ip 3 4 for two - tone input power 0.05 ghz up to +5 dbm 0.5 - 2.0 ghz dbm dbm ? ? +40 +47 ? ? 1. all specifications apply when operated with bias voltages of +5.0v for v cc and ? 5.0v to - 8.0v for v ee , and 50 o impedance at all ports unless otherwise specified. 2. above reference insertion loss. 3. this attenuator is guaranteed monotonic. 4. v ee = - 5.0v for the typical numbers given.
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 2 ghz at - 283 specifications subject to change without notice. n north america: tel. (800) 366 - 2266 n asia/pacific: tel.+ 81 - 44 - 844 - 8296 , fax + 81 - 44 - 844 - 8298 n europe: tel. +44 (1344) 869 595, fax+44 (1344) 300 020 visit www.macom.com for additional data sheets and product information. v 5.00 2 parameter test conditions units min typical max input ip 2 4 for two - tone input power 0.05 ghz up to +5 dbm 0.5 - 2.0 ghz dbm dbm ? ? +53 +68 ? ? i cc v cc = 4.5 to 5.5v vctl = 0 to 0.8v, or v cc - 2.1v to v cc ma ? ? 5.0 i ee v ee = - 5.0 to ? 8.0v ma ? ? 1.0 vctl vctl logic 0 (ttl) logic 1 (ttl) v v 0.0 2.0 ? ? 0.8 5.0 input leakage current (low) input leakage current (high) 0 to 0.8v 2.0 to 5.0v a a ? ? ? ? 1.0 1.0 v cc v ee ? ? v v 4.5 - 8.0 5.0 ? 5.5 - 5.0 recommended pcb layout absolute maximum ratings parameter absolute maximum maximum input power 0.05 ghz 0.5 - 2.0 ghz +27 dbm +34 dbm supply voltages v cc v ee +5.5v - 8.5v control voltage - 0.5v to v cc + 0.5v operating temperature - 55c to +125c storage temperature - 65c to +150c note: operation of this device above any on of these parameters may cause permanent damage. truth table control inputs c1 c2 c3 c4 c5 attenuation 0 0 0 0 0 reference 1 0 0 0 0 0.5 db 0 1 0 0 0 1 db 0 0 1 0 0 2 db 0 0 0 1 0 4 db 0 0 0 0 1 8 db 1 1 1 1 1 15.5 db 0 = ttl low; 1 = ttl high functional schematic (top view) electrical specifications 1 : t a = 25 c
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 2 ghz at - 283 specifications subject to change without notice. n north america: tel. (800) 366 - 2266 n asia/pacific: tel.+ 81 - 44 - 844 - 8296 , fax + 81 - 44 - 844 - 8298 n europe: tel. +44 (1344) 869 595, fax+44 (1344) 300 020 visit www.macom.com for additional data sheets and product information. v 5.00 typical performance curves reference insertion loss vs. 3 attenuation accuracy vs. frequency 0.5, 1, 2 db bits attenuation accuracy vs. frequency 4, 8 db bits and full attenuation vswr vs. frequency reference loss, 0.5, 1, 2 db bits -0.5 -0.3 0.0 0.3 0.5 0 500 1000 1500 2000 frequency (mhz) deviation from nom. atten. (db) 1.0 1.2 1.4 1.6 1.8 2.0 0 500 1000 1500 2000 frequency (mhz) vswr -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 frequency (mhz) deviation from nom. atten. (db) full atten. 0.0 1.0 2.0 3.0 4.0 5.0 0 500 1000 1500 2000 frequency (mhz) insertion loss (db) +25c -55c +85c vswr vs. frequency 4, 8 db bits and full attenuation ordering information 5 part number package at - 283 pin cr - 12 5. contact the factory for standard or custom screening requirements. 1.0 1.2 1.4 1.6 1.8 2.0 0 500 1000 1500 2000 frequency (mhz) vswr
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