using the dr65-0109 to drive spdt pin switches rev. v2 application note AN3008 ? north america tel: 800.366.2266 ? europe tel: +353.21.244.6400 ? india tel: +91.80.4155721 ? china tel: +86.21.2407.1588 1 visit www.macomtech.com for additional data sheets and product information. m/a-com technology solutions inc. and its affiliates reserve the right to make changes to the product(s) or inform ation contained herein without notice. introduction for use as a replacement part to the dr65-0003 pin driver. this application note describes how to use the m/a-com dr65-0109 single channel driver for fet switches as a sp2t pin diode driver. when configured per the directions herein, the dr65-0109 will provide the same functionality as the dr65-0003 in the same package style, however the pinout is different. using the dr65-0109 as a direct drop-in replacement without doing a pcb change will not pin# function pin # function 1 vcc 5 ground 2 logic input 6 non-inverting output 3 vdd 7 inverting output 4 ground 8 vee pin assignments electrical specifications: t a = +25 c, +vcc = + vdd = + 5.0v 5%, -vee = - 5.0v 5% parameter test conditions units min typical max switching speed 1 delay rt/ft spike current into 10 ohm load 50 % ttl to 90% 10%-90%; 90%-10% ns ns ? ? 25 2 35 5 prf 50% duty cycle mhz dc ? 5 output voltage drop, no load with reference to supply voltage v ? ? .25 dc output current peak spike output current load dependent spiking capacitor in circuit ma ma ? ? 30 150 50 200 output stage on resistance positive output fet, qp negative output fet, qn w w ? ? 15 25 ? ? quiescent supply currents +5v -5v ma ma ? ? ? ? 1.0 .2 ttl levels logic ?0? @ 20 a sink current logic ?1? @ 20 a source current v v 0 2.0 ? ? .8 5.0 package dissipation ? mw ? ? 200 1. decoupling capacitors (.01 f) are required on power supply lines. equivalent output circuit for pins 6 & 7 .1v 15 ohms vdd .1v 25 ohms vee pin 6 & pin 7
using the dr65-0109 to drive spdt pin switches rev. v2 application note AN3008 ? north america tel: 800.366.2266 ? europe tel: +353.21.244.6400 ? india tel: +91.80.4155721 ? china tel: +86.21.2407.1588 2 visit www.macomtech.com for additional data sheets and product information. m/a-com technology solutions inc. and its affiliates reserve the right to make changes to the product(s) or inform ation contained herein without notice. typical application for sp2t circuit description of circuit the dr65-0109 provides 2 complementary outputs t hat are each capable of driving a maximum of 50 ma into a load. in addition, with proper capacitor selection (c3 & c4) used in parallel with the current setting resistor (r1 & r2), a maximum of 200 ma of spiking current can be achieved. configurations using dc steering diodes and a lower vdd supply will decrease the peak spiking current available to the user. to achieve the non-inverting and inverting complement ary voltages, each output is switched between two inter- nal fets. the fets are connected to vdd for the posit ive output and vee for the negat ive output. vdd and vee are adjustable for various configurations and have the fo llowing limitations: vee can be no more negative than ? 5.5 volts; vdd can be no more positive than 5.5 volts a nd vdd must always be less than or equal to vcc. in- creasing vdd beyond vcc will prevent the device from switch ing states when commanded to by the logic input. recommended configurations are to drive vee at ?5.0 vo lts and vcc and vdd should be tied together at 5 volts.
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