linear driver for pin diode attenuators rev. v2 madr - 007098 1 1 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 1 features ? linearizes pin diode attenuators over a wide attenuation range ? output currents up to 12 ma ? operates with a single supply voltage of +3v to +12 v ? low quiescent currents ? single control voltage ? test boards are available ? tape and reel packaging available ? lead - free sow - 16 package ? 100% matte tin plating over copper ? halogen - free green mold compound ? 260c reflow compatible ? rohs* compliant version of dr65 - 0002 description m/a - com's madr - 007098 - 000100 is a break point free driver that produces a logarithmic output current suitable for linearizing pin diode based shunt attenuators. this driver, in conjunction with customer defined external components, produces a linear transfer function (db/v) between the input control voltage of the driver and the attenuation output of the pin attenuator. the madr - 007098 - 000100 has been optimized for linearizing m/a - coms maav - 007089 - 000100 or maav - 007090 - 000100 attenuators, but will function well with most types of cathode grounded, pin attenuators. the driver is packaged in a sow - 16 package for commercial smt applications. a typical schematic for a 30 db, 7.5 db/v linear attenuator is shown in figure 1. ordering information part number package madr - 007098 - 000100 bulk packaging madr - 007098 - 0001tr 1000 piece reel maav - 007089 - dr01tb test board with circuit per figure 1 ( maav - 007089 - 000100 , gsm attenuator) maav - 007090 - dr01tb test board with circuit per figure 1 ( maav - 007090 - 000100 , pcs attenuator) note: reference application note m513 for reel size information. * restrictions on hazardous substances, european union directive 2002/95/ec. circuit description: (reference figures 1 and 2) the input divider, r1 and the sum of r2 and r3, sets the overall transfer function of the circuit. to increase the transfer function, decrease the control voltage and the value of r1. varying the value of r4 will optimize the linearity of the circuit. one can achieve a very linear transfer function (less than 1 db/v) by driving the attenuator over a smaller portion of its dynamic range. in the case of the maav - 007089 - 000100 and maav - 007090 - 000100 attenuators, this would be limited to a dynamic range of 28 and 25 db, respectively. temperature compensation is a function temperature coefficient of the thermistor, r3, and the ratio of r2 to r3, and can only be optimized once the transfer function and linearity component values have been established. pin configuration pin no. function pin no. function 1 n/c 9 n/c 2 n/c 10 n/c 3 ref 11 n/c 4 input + 12 output 5 gnd 13 n/c 6 n/c 14 + v cc 7 n/c 15 n/c 8 n/c 16 n/c
linear driver for pin diode attenuators rev. v2 madr - 007098 2 2 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 2 figure 1. linear attenuator schematic figure 2. typical attenuation error madr-007098-000100 driver with maav-007090-000100 vva -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 0 3 6 9 12 15 18 21 24 27 30 attenuation (db) attenuation error (db) frequency: 1960 m hz vco nt: 0 to 4.0v madr - 007098 - 000100 in ref 3 r 2 680 r 3 ( ptct ) 330 r 1 39 k vcontrol ( 0 to 4 v ) 5 4 voltage variable attennuator 12 + vcc r 4 360 c 1 . 01 f 14 7 2 10 1 , 3 , 4 5 , 6 , 8 9 , 11 , 12 16 , 14 , 13 notes : a . transfer function is 7 . 5 db / v b . vcontrol is 0 v to 4 . 0 v c . + vcc is 5 . 0 v 5 % d . r 3 is a positive temperature coefficient thermistor . e . attenuator is maav - 007089 - 000100 or maav - 007090 - 000100 rfin rfoutput
linear driver for pin diode attenuators rev. v2 madr - 007098 3 3 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 3 electrical specifications: t a = 25 c, z 0 = 50 ? parameter test conditions units min typ max output drive current load dependent ma 10 +v cc supply range v 3.0 5.0 12 +v cc supply tolerance % 5 +v cc quiescent current no load ma 1.0 2.0 linearity application dependent db 1 2.5 transfer function application dependent db/v 3 7.5 10 settling time 50% ctl to 90%/10% rf s 50 absolute maximum ratings 1 ,2 parameter absolute maximum +v cc +20 v input + 5 v ref 5 v output current 20 ma operating temperature - 40o c to +85 o c storage temperature - 65o c to +125oc package power dissipation 150 mw lead temperature 300o c for 10 seconds 1. exceeding any one or combination of these limits may cause permanent damage to this device. 2. m/a - com does not recommend sustained operation near these survivability limits. handling procedures please observe the following precautions to avoid damage: static sensitivity gallium arsenide integrated circuits are sensitive to electrostatic discharge (esd) and can be damaged by static electricity. proper esd control techniques should be used when handling these devices.
linear driver for pin diode attenuators rev. v2 madr - 007098 4 4 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 4 lead - free, sow - 16 ? ? reference application note m538 for lead - free solder reflow recommendations.
linear driver for pin diode attenuators rev. v2 madr - 007098 5 5 m/a - com technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. visit www.macom.com for additional data sheets and product information. for further information and support please visit: https://www.macom.com/support 5 m/a - com technology solutions inc. all rights reserved. information in this document is provided in connection with m/a - com technology solutions inc ("macom") products. these materials are provided by macom as a service to its customers and may be used for informational purposes only. except as provided in macom's terms and conditions of sale for such products or in any separate agreement related to this document, macom assumes no liability whatsoever. macom assumes no responsibility for errors or omissions in these materials. macom may make changes to specifications and product descriptions at any time, without notice. macom makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppels or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of macom products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. macom further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. macom shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. macom products are not intended for use in medical, lifesaving or life sustaining applications. macom customers using or selling macom products for use in such applications do so at their own risk and agree to fully indemnify macom for any damages resulting from such improper use or sale.
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