attenuators - smt 5 5 - 84 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com HMC346G8 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz v03.1008 general description features functional diagram wide bandwidth: dc - 8 ghz low phase shift vs. attenuation 30 db attenuation range 8 lead hermetic smt package electrical speci cations, t a = +25 c, 50 ohm system typical applications the HMC346G8 is ideal for: ? basestation infrastructure ? fiber optics & broadband telecom ? microwave radio & vsat ? military radios, radar, & ecm ? test instrumentation the HMC346G8 is an absorptive voltage variable attenuator (vva) in an 8 lead glass / metal (her- metic) surface-mount package operating from dc - 8 ghz. it features an on-chip reference attenuator for use with an external op-amp to provide simple single voltage attenuation control, 0 to -3v. the device is ideal in designs where an analog dc control signal must control rf signal levels over a 30 db amplitude range. applications include agc circuits and temperature compensation of multiple gain stages in microwave radios and test instrumentation. parameter min typical max units insertion loss dc - 6 ghz dc - 8 ghz 2.0 2.0 3.0 3.5 db db attenuation range dc - 8 ghz 30 db return loss dc - 8 ghz 7 10 db switching characteristics trise, tfall (10/90% rf) ton, toff (50% ctl to 10/90% rf) 2 8 ns ns input power for 0.25 db compression (0.5 - 8 ghz) min. atten. atten. >2 db +8 -2 dbm dbm input third order intercept (0.5 - 8 ghz) (two-tone input power = -8 dbm each tone) min. atten. atten. >2 db +25 +10 dbm dbm
attenuators - smt 5 5 - 85 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com insertion loss vs. temperature return loss vs. attenuation relative attenuation vs. control voltage @ 8 ghz relative attenuation vs. control voltage @ 4 ghz relative attenuation, control voltage optimized for 4 ghz operation relative attenuation, control voltage optimized for 8 ghz operation -5 -4 -3 -2 -1 0 012345678 + 25c - 40c + 85c insertion loss (db) frequency -3 -2.5 -2 -1.5 -1 -0.5 0 0 5 10 15 20 25 30 v1 + 25c v2 + 25c v1 - 40c v2 - 40c v1 + 85c v2 + 85c control voltage (vdc) relative attenuation (db) -3 -2.5 -2 -1.5 -1 -0.5 0 0 5 10 15 20 25 30 v1 + 25c v2 + 25c v1 - 40c v2 - 40c v1 + 85c v2 + 85c control voltage (vdc) relative attenuation (db) -40 -30 -20 -10 0 012345678 attenuation (db) frequency (ghz) -25 -20 -15 -10 -5 0 012345678910 5 db 10 db 15 db 20 db 25 db 30 db return loss (db) frequency (ghz) -40 -30 -20 -10 0 012345678 attenuation (db) frequency (ghz) HMC346G8 v03.1008 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz
attenuators - smt 5 5 - 86 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com relative phase input second order intercept vs. attenuation* 1 db compression vs. attenuation input third order intercept vs. attenuation* 0.25 db compression vs. attenuation second harmonic vs. attenuation *two-tone input power = -8 dbm each tone. -5 0 5 10 15 20 012345678 0 db (ref) 5 db input.25db compression (dbm) frequency (ghz) -5 0 5 10 15 20 012345678 0 db (ref) 5 db input p1db (dbm) frequency (ghz) 20 30 40 50 60 70 80 012345678 0 db 3 db 6 db 10 db second harmonic (dbc) frequency (ghz) 10 20 30 40 50 60 70 012345678 0 db 3 db 6 db 10 db ip2 (dbm) frequency (ghz) 5 10 15 20 25 30 012345678 0 db 3 db 6 db 10 db ip3 (dbm) frequency (ghz) 0 10 20 30 40 50 60 012345678 5 db 10 db 15 db 20 db 25 db 30 db relative phase (deg) frequency (ghz) HMC346G8 v03.1008 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz
attenuators - smt 5 5 - 87 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com outline drawing absolute maximum ratings rf input power +18 dbm control voltage range +1 to -5v storage temperature -65 to +150 c operating temperature -40 to +85 c esd sensitivity (hbm) class 1a notes: 1. package material: alumina loaded borosilicate glass. 2. lead, base, cover material: kovar? (#7052 corning). 3. plating: electrolytic gold 50 microinches min., over electrolytic nickel 50 microinches min. 4. dimensions are in inches [millimeters]. 5. tolerances: .005 [0.13] unless otherwise specified. 6. all ground leads and ground paddle must be soldered to pcb rf ground. electrostatic sensitive device observe handling precautions HMC346G8 v03.1008 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz
attenuators - smt 5 5 - 88 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com pin number function description interface schematic 1, 8 rf1, rf2 this pin is dc coupled and matched to 50 ohm. blocking capacitors are required if rf line potential is not equal to 0v. 2, 7 gnd this pin must be dc grounded. 3, 6 v2, v1 control input (master). 4 i control input (slave). 5 o this pin must have an external 500 ohm resistor to ground. pin descriptions single-line control driver note: external op-amp control circuit maintains imped- ance match while attenuation is varied. input con- trol ranges from 0 volts (min. attenuation) to -2.5 volts (max. attenuation.) HMC346G8 v03.1008 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz
attenuators - smt 5 5 - 89 for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com evaluation pcb the circuit board used in the nal application should be generated with proper rf circuit design techniques. signal lines at the rf ports should be 50 ohm impedance and the package ground leads and package bottom should be connected directly to the pcb rf ground plane, similar to that shown above. the evaluation circuit board shown above is available from hittite microwave corporation upon request. list of materials for evaluation pcb 104095 [1] item description j1 - j2 pcb mount sma rf connector j3 - j7 dc pin u1 HMC346G8 pcb [2] 104093-2 eval board [1] reference this number when ordering complete evaluation pcb [2] circuit board material: rogers 4350 HMC346G8 v03.1008 gaas mmic hermetic smt voltage- variable attenuator, dc - 8 ghz
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