digital attenuator, 30 db, 4 - bit, ttl driver, dc - 2.5 ghz at90 - 1233 csp - 1 v 1.00 features n attenuation: 2 db steps to 30 db n single positive supply n contains internal dc to dc converter n small footprint, jedec pa ckage n integral ttl driver n 50 ohm impedance n test boards available n tape and reel packaging available description m/a - com?s at90 - 1 233 is a gaas fet 4 - bit digital attenuator with integral driver. step size is 2 db providing a 30 db attenuation range. this device is in an fqfp - n plastic surface mount package. the at90 - 1233 is suited for single supply applications where accuracy, fa st speed, low power consumption and low costs are required. electrical specifications t a = +25c parameter test conditions frequency units min typical max insertion loss ? dc - 2.5 ghz db ? 2.7 3.0 attenuation accuracy individual bits or combination of bits dc - 2.5 ghz db ? ? (. 3 + 5 % of atten setting ) vswr full range dc - 2.5 ghz ratio ? 1.5:1 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 - 2.5 ghz db m db m ? ? +21 +29 ? ? input ip 3 two - tone inputs up to +5 dbm 50 mhz 0.5 - 2.5 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
digital attenuator, 30 db, 4 - bit, ttl driver, dc - 2.5 ghz at90 - 1233 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 1.00 2 recommended pcb layout 7 7. application note c2083 is available on line at www.macom.com pin configuration p in no. function pin no. function 1 gnd 17 n/c 2 c16 18 n/c 3 c8 19 +v cc 2 4 c4 20 n/c 5 c2 21 cp 4 6 gnd 22 n/c 7 gnd 23 cp 4 8 n/c 24 n/c 9 n/c 25 - v ee 3 10 n/c 1 26 gnd 11 gnd 27 rf2 12 rf1 28 gnd 13 gnd 29 n/c 1 14 n/c 30 - v ee 3,5 15 n/c 31 n/c 16 n/c 32 +v cc 2,6 1. pins 10 and 29 must be isolated. 2. pin 19 must be connected to pin 32. 3. pin 25 must connect to pin 30. 4. a .01 f cap must be connect ed between pins 21 and 23. 5. - v ee is produced internally and requires a .1 f cap to gnd. 6. +v cc requires a .1 f cap to gnd. absolute maximum ratings 8 parameter absolute maximum max. input power 0.05 ghz 0.5 - 2.5 ghz +27 dbm +34 dbm +vcc +5.5v - vee - 8.5v 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. c16 c6 c4 c2 attenuation 0 0 0 0 loss, reference 0 0 0 1 2.0 db 0 0 1 0 4.0 db 0 1 0 0 8.0 db 1 0 0 0 16.0 db 1 1 1 1 30.0 db truth table ordering information part number package at90 - 1233 bulk packaging at90 - 1233tr tape and reel (1k reel) at90 - 1233 - tb units mounted on test board 0 = ttl low; 1 = ttl high
digital attenuator, 30 db, 4 - bit, ttl driver, dc - 2.5 ghz at90 - 1233 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 1.00 3 3 typical performance curves vswr @ insertion loss insertion loss attenuation error, 2 db bit attenuation error, 4 db bit attenuation error, 8 db bit attenuation error, 16 db bit 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr input output 1.00 1.50 2.00 2.50 3.00 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db) -0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db) -0.40 -0.20 0.00 0.20 0.40 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db) -0.40 -0.20 0.00 0.20 0.40 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db) -0.80 -0.60 -0.40 -0.20 0.00 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db)
digital attenuator, 30 db, 4 - bit, ttl driver, dc - 2.5 ghz at90 - 1233 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 1.00 4 typical performance curves vswr, 2 db bit attenuation error, max. attenuation vswr, 4 db bit vswr, 8 db bit vswr, 16 db bit vswr, maximum attenuation 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr output input 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr output input 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr output input 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr output input 1.00 1.20 1.40 1.60 0 500 1000 1500 2000 2500 frequency (mhz) vswr output input -1.50 -1.00 -0.50 0.00 0.50 0 500 1000 1500 2000 2500 frequency (mhz) attenuation (db)
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