emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified rev 07/28/2010 data sheet qtvaxx0nxxxsmtf features applications ? 36 ? 50 ghz ? surface mount for pick and place assembly ? 1206 small footprint ? rohs compliant versions ? available on tape & reel ? same footprint, fixed versions available ? point to point radios ? phased array radar ? high frequency transceivers ? up/down converters ? software defined radios general description the qtva is a one of a kind, temperature variable high fr equency surface mount device devel oped for applications where specific signal level control is required. being passive in nature, there is no distortion, phase shift or time delay. the attenuator structure is internally t uned for optimum performance beyond ka band, wi th the added benefit of being a truly symmetrical, bidirectional att enuator. the qtva comes in two styles, microstrip and coplanar. electrical specifications (1) specification notes: (1) measured on emc technology test fixture. spec ifications are subject to change without notice. (2) tca = (linear regression slope) / (attenuation @ 25c). calculate linear regression slope from attenuation versus temperature from -55c to +125c in 20c increment. (3) full rated power to 125c, derated linearly to 0 watts at 150c part numbering qtvaxxxnxxxsmtf frequency ghz impedance ? attenuation db attenuation accuracy db temperature coefficient (2) 10 -3 db/db/c temperature coefficient tolerance 10 -3 db/db/c power handling (3) mwatts cw vswr max operating temperature c 36 ? 50 50 0, 3 ? 10 0.5 3, 5, 7 1 200 1.50 -55 to +150
rev 07/28/2010 2 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf typical performance qtva060nxxmsmtf* * simulation data at 25c qtvaxxxxnxxcsmtf
rev 07/28/2010 3 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf qtvaxx0nxxmsmtf pin designation / mechanical specification 0.120 [3.05] 0.065 [1.65] 0.009 0.006 [ 0.22 0.15 ] top side bottom side 0.010 [0.25] 0.005 [0.13] 0.020 [0.51] 0.010 [0.25] 0.010 [0.25] mechanical specification substrate 96% alumina resistive element thick film encapsulant silicon polymer termination gold termination finish silver .0003 - .0006 nickel .0001 - .0003 mounting for qtvaxx0nxxmsmtf 0.025 [0.64] 0.020 [0.51] 50 ohm line 5x ?0.012 [?0.30] plated thru holes 0.063 [1.60] mounting cross-section view 0.024 [0.61] 0.038 [0.96]
rev 07/28/2010 4 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf qtvaxx0nxxcsmtf pin designatio n / mechanical specification bottom side top side xx input/output protective coating tie to microstrip ground 0.120 [3.05] 0.065 [1.65] 0.025 0.021 [ 0.64 0.53 ] bottom side top side 0.020 [0.51] 0.010 [0.25] 0.010 [0.25] 0.013 [0.32] ground 0.095 [2.41] xx attenuation value 0.040 [1.02] 0.095 [2.41] mechanical specification substrate 96% alumina resistive element thick film encapsulant silicon polymer termination gold termination finish silver .0003 - .0006 nickel .0001 - .0003
rev 07/28/2010 5 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf mounting for qtvaxx0nxxcsmtf land pattern flip chip mounting ?0.010 [?0.25] 0.020 [0.51] 0.013 [0.32] 0.010 [0.25] 0.020 [0.51] 0.025 [0.64] 0.095 [2.41] 0.003 [0.06] 50ohm microstrip trace dielectric microstrip ground plane gap created by etching land pattern
rev 07/28/2010 6 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf commonly used attachment materials material composition thermal conductivity ( watts/cm/ c ) melting temperature ( c ) gold-tin solder 80% gold / 20% tin 0.58 280 lead-free solder 99.3% ti n ? 0.7% copper n/a 227 lead-free solder 96.5% tin / 3.5% silver 0.33 221 lead-free solder 96.5% tin / 3% s ilver / 0.5% copper n/a 217 - 220 sn63 solder 63% tin / 37% lead 0.49 183 conductive epoxy silver filled 0.01 to 0.29 n/a circuit board layout qtvaxx0nxxxsmtf in order to achieve the specified rf performance, an optimized rf test board mu st be used for testing this attenuator. florida rf labs test board is cons tructed with a 0.010 in rogers ro4350b high frequency board material is shown below. [drawing tbd] figure 1: qtvaxx0nxxmsmtf figure 2: qtvaxx0nxxcsmtf
rev 07/28/2010 7 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf soldering profile
rev 07/28/2010 8 emc-rflabs.com ? +1 772-286-9300 as 9100 , iso 9001 and iso 14001 certified data sheet qtvaxx0nxxxsmtf packaging [drawing tbd] figure 3: qtvaxx0nxxmsmtf figure 4: qtvaxx0nxxcsmtf
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