attenuators - analog - chip 1 1 - 34 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 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz v01.0209 general description features functional diagram low insertion loss: 2 db wide dynamic range: 14 db balanced topology flexible biasing single control voltage: -5v to +5v die size: 1.99 x 1.845 x 0.1 mm electrical speci cations, t a = +25 c, 50 ohm system typical applications this hmc-vvd104 is ideal for: ? e-band communication systems ? short haul / high capacity radios ? automotive radar ? test equipment ? satcom and sensors the hmc-vvd104 is a monolithic gaas pin diode based voltage variable attenuator (vva) which exhibits low insertion loss, high ip3, and wide dy- namic range. the balanced topology delivers excellent return loss while the single control voltage can be applied to either side of the die. all bond pads and the die backside are ti/au metallized, and the pin diode devices are fully passivated for reliable operation. this wideband vva mmic is compatible with conventional die attach methods, as well as thermocompression and thermosonic wirebonding, making it ideal for mcm and hybrid microcircuit applications. all data shown herein is measured with the chip in a 50 ohm environment and contacted with rf probes. hmc-vvd104 parameter min. typ. max. units frequency range 70 - 86 ghz insertion loss 23db attenuation range 14 db input return loss 14 db output return loss 12 db *unless otherwise indicated, all measurements are from probed die
attenuators - analog - chip 1 1 - 35 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 hmc-vvd104 v01.0209 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz dynamic range vs. frequency output return loss vs. frequency attenuation vs. frequency input return loss vs. frequency -18 -15 -12 -9 -6 -3 0 70 74 78 82 86 90 -5v 5v attenuation (db) frequency (ghz) -30 -25 -20 -15 -10 -5 0 70 74 78 82 86 90 -5v 5v return loss (db) frequency (ghz) -30 -25 -20 -15 -10 -5 0 70 74 78 82 86 90 -5v 5v return loss (db) frequency (ghz) 0 4 8 12 16 70 74 78 82 86 90 dynamic range (db) frequency (ghz)
attenuators - analog - chip 1 1 - 36 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 hmc-vvd104 v01.0209 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz outline drawing absolute maximum ratings control voltage range (vdd) -6v to +6v vdc storage temperature -65 to +150 c operating temperature -55 to +85 c bias current (idd) 30 ma electrostatic sensitive device observe handling precautions notes: 1. all dimensions are in inches [mm]. 2. typical bond pad is .004 square. 3. backside metallization: gold. 4. backside metal is ground. 5. bond pad metallization: gold. 6. connection not required for unlabeled bond pads. 7. overall die size .002 die packaging information [1] standard alternate gp-1 (gel pack) [2] [1] refer to the packaging information section for die packaging dimensions. [2] for alternate packaging information contact hittite microwave corporation.
attenuators - analog - chip 1 1 - 37 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 pad number function pad description interface schematic 1rfin this pin is dc blocked and matched to 50 ohms. 2, 4 vdd control input. 3rfout this pin is dc blocked and matched to 50 ohms. die bottom gnd die bottom must be connected to rf/dc ground pad descriptions hmc-vvd104 v01.0209 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz
attenuators - analog - chip 1 1 - 38 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 assembly diagram note 1: bypass caps should be 100 pf (approximately) ceramic (single-layer) placed no farther than 30 mils from the ampli er. note 2: best performance obtained from use of <6 mil (long) by 3 by 0.5mil ribbons on input and output. note 3: part can be biased from either side. hmc-vvd104 v01.0209 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz
attenuators - analog - chip 1 1 - 39 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 mounting & bonding techniques for millimeterwave gaas mmics the die should be attached directly to the ground plane eutectically or with conductive epoxy (see hmc general handling, mounting, bonding note). 50 ohm microstrip transmission lines on 0.127mm (5 mil) thick alumina thin lm substrates are recommended for bringing rf to and from the chip (figure 1). if 0.254mm (10 mil) thick alumina thin lm substrates must be used, the die should be raised 0.150mm (6 mils) so that the surface of the die is coplanar with the surface of the substrate. one way to accom- plish this is to attach the 0.102mm (4 mil) thick die to a 0.150mm (6 mil) thick molybdenum heat spreader (moly-tab) which is then attached to the ground plane (figure 2). microstrip substrates should be placed as close to the die as possible in order to minimize bond wire length. typical die-to-substrate spacing is 0.076mm to 0.152 mm (3 to 6 mils). handling precautions follow these precautions to avoid permanent damage. storage: all bare die are placed in either waffle or gel based esd protec- tive containers, and then sealed in an esd protective bag for shipment. once the sealed esd protective bag has been opened, all die should be stored in a dry nitrogen environment. cleanliness: handle the chips in a clean environment. do not attempt to clean the chip using liquid cleaning systems. static sensitivity: follow esd precautions to protect against esd strikes. transients: suppress instrument and bias supply transients while bias is applied. use shielded signal and bias cables to minimize inductive pick-up. general handling: handle the chip along the edges with a vacuum collet or with a sharp pair of bent tweezers. the surface of the chip has fragile air bridges and should not be touched with vacuum collet, tweezers, or ngers. mounting the chip is back-metallized and can be die mounted with ausn eutectic preforms or with electrically conductive epoxy. the mounting surface should be clean and at. eutectic die attach: a 80/20 gold tin preform is recommended with a work surface temperature of 255 c and a tool temperature of 265 c. when hot 90/10 nitrogen/hydrogen gas is applied, tool tip temperature should be 290 c. do not expose the chip to a temperature greater than 320 c for more than 20 seconds. no more than 3 seconds of scrubbing should be required for attachment. epoxy die attach: apply a minimum amount of epoxy to the mounting surface so that a thin epoxy llet is observed around the perimeter of the chip once it is placed into position. cure epoxy per the manufacturers schedule. wire bonding rf bonds made with 0.003 x 0.0005 ribbon are recommended. these bonds should be thermosonically bonded with a force of 40-60 grams. dc bonds of 0.001 (0.025 mm) diameter, thermosonically bonded, are recommended. ball bonds should be made with a force of 40-50 grams and wedge bonds at 18-22 grams. all bonds should be made with a nominal stage temperature of 150 c. a minimum amount of ultrasonic energy should be applied to achieve reliable bonds. all bonds should be as short as possible, less than 12 mils (0.31 mm). 0.102mm (0.004?) thick gaas mmic wire bond rf ground plane 0.127mm (0.005?) thick alumina thin film substrate 0.076mm (0.003?) figure 1. 0.102mm (0.004?) thick gaas mmic wire bond rf ground plane 0.254mm (0.010?) thick alumina thin film substrate 0.076mm (0.003?) figure 2. 0.150mm (0.005?) thick moly tab hmc-vvd104 v01.0209 gaas pin mmic voltage-variable attenuator, 70 - 86 ghz
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