digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 3.5 ghz at90 - 1283 csp - 1 v 4.00 electrical specifications t a = +25c parameter test conditions frequency units min typical max insertion loss ? dc - 3.5 ghz db ? 2.8 3.2 attenuation accuracy individual bits 0.5 - 1 - 4 - 8 db individual bit 2 db any combination of bits 1 to 15.5 db dc - 3.5 ghz dc - 3.5 ghz dc - 3.5 ghz db db db ? ? ? ? ? ? (. 3 + 5 % of atten setting ) (. 4 + 10 % of atten setting ) (. 5 + 7 % of atten setting ) vswr full range dc - 3.5 ghz ratio ? 1. 6 :1 1.8 :1 switching speed 50% cntl to 90%/10% rf 10% to 90% or 90% to 10% ? ? ns ns ? ? 75 20 150 50 1 db compression ? ? 50 mhz 0.5 - 3.5 ghz dbm dbm ? ? +21 +29 ? ? input ip 3 two - tone inputs up to +5 dbm 50 mhz 0.5 - 3.5 ghz db db ? ? +35 +48 ? ? + vcc ? ? v 4.75 5.0 5.25 logic ?0? sink current is 20 a max. ? v 0.0 ? 0 .8 logic ?1? source current is 20 a max. ? v 2.0 ? 5.0 icc vcc min to max, logic ?0? or ?1? ? ma ? 6 10 features n attenuation: 0.5 db steps to 15.5 db n single positive supply n contains internal dc to dc converter n low dc power consump tion n small footprint, jedec package n integral ttl driver n 50 ohm impedance description m/a - com's at 90 - 1 283 is a gaas fet 5 - bit dig ital attenuator with integral ttl driver. step size is 0.5 db providing a 15.5 db total attenuation range. this device is in a n fqfp - n plastic surface mount package. the at 90 - 1 283 is ideally suited for use where accuracy, fast speed, very low power consump tion and low costs are required.
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 3.5 ghz at90 - 1283 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 4.00 2 absolute maximum ratings 8 parameter absolute maximum max. input power 0.05 ghz 0.5 - 3.5 ghz +27 dbm +34 dbm +vcc +5.5v logic voltages 9 - 0.5 to + vcc + 0.5v operating temperature - 40c to +85c storage temperature - 65c to +125c 8. operation of this device above any one of these parameters may cause permanent damange. 9. standard cmos ttl interface, latch - up wi ll occur if logic signal is applied prior to power supply. recommended pcb layout 7 truth table 0 = ttl low; 1 = ttl high pin configuration pin # function pin # function 1 gnd 17 nc 2 c8 18 nc 3 c4 19 +vcc 2 4 c 2 20 nc 5 c 1 21 cp 4 6 c0.5 22 nc 7 gnd 23 cp 4 8 nc 24 nc 9 nc 2 5 - vee 3,5 10 nc 1 2 6 gnd 11 gnd 2 7 rf2 12 rf1 2 8 gnd 13 gnd 29 nc 1 14 nc 30 - vee 3,5 15 nc 31 nc 16 nc 32 +vcc 2,6 1. pins 10 & 29 must be isolated 2. pin 19 must be connected to pin 32. 3. pin 25 must be connected to pin 30. 4. .01 f cap must be between pins 21 & 23. 5. - vee produced internally and requires a .1 f cap to gnd. 6. +vcc requires a .1 f cap to gnd. c8 c4 c2 c1 c0.5 attenuation 0 0 0 0 0 loss, reference 0 0 0 0 1 0.5 db 0 0 0 1 0 1.0 db 0 0 1 0 0 2.0 db 0 1 0 0 0 4.0 db 1 0 0 0 0 8.0 db 1 1 1 1 1 15.5 db 7. application note c2083 is available on line at www.macom.com
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 3.5 ghz at90 - 1283 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 4.00 typical performance curves 3 attenuation error, 1 db bit attenuation error, 0.5 db bit attenuation error, 2 db bit attenuation error, 4 db bit -1.0 -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) -1.0 -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) -1.0 -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) vswr @ insertion loss insertion loss 1.0 1.5 2.0 2.5 3.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) loss (db) 1.00 1.25 1.50 1.75 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 3.5 ghz at90 - 1283 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 4.00 typical performance curves 4 attenuation error, 8 db bit attenuation error, max. attenuation -0.5 0.0 0.5 1.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) -1.0 0.0 1.0 2.0 3.0 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) error (db) vswr, 1 db bit vswr, 0.5 db bit vswr, 2 db bit vswr, 4 db bit 1.0 1.2 1.4 1.6 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output 1.0 1.2 1.4 1.6 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output 1.0 1.2 1.4 1.6 1.8 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output 1.0 1.2 1.4 1.6 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output
digital attenuator, 15.5 db, 5 - bit, ttl driver, dc - 3.5 ghz at90 - 1283 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 4.00 typical performance curves 5 ordering information part number package at 90 - 1283 bulk packaging at 90 - 1283 tr tape and ree l (1k reel) at 90 - 1283 - tb units mounted on test board vswr, 8 db bit vswr, maximum attenuation 1.0 1.2 1.4 1.6 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output 1.0 1.2 1.4 1.6 1.8 0 500 1000 1500 2000 2500 3000 3500 frequency (mhz) vswr ratio input output
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