7-161 absorptive spdt gaas mmic switch technical data features ? single-pole, double-throw output ? broad bandwidth: dc to 3 ghz ? high isolation: 37 db typical at 1 ghz ? fast switching time: 3 ns typical ? ultra low dc power consumption ? small surface-mount plastic package MGS-71008 so-8 package description the MGS-71008 is a single-pole, double-throw monolithic gaas mmic switch. the j2 and j3 of the MGS-71008 are terminated to ground by internal 50 w load resistors when off (a reflective version, the mgs-70008, which terminates the off port to ground, is also available). the switch is sealed in a small, plastic, ac equivalent circuit/pinout j1 ground j2 control 1 control 2 j3 ground ground surface-mount so-8 package. switching is actuated by a -5 v control voltage per the truth table shown on the next page. -3.3 v operation is also possible with some reduction in p 1 db and ip 3 . the MGS-71008 is designed for high volume commercial applica- tions where low insertion loss, high isolation, and fast switching speed are required. its low cost and high performance make it suitable for a wide variety of uses such as digital cellular, spread spectrum, gps, and other rf switching applications. refer to applications note an-g007 for more application details. the die is fabricated using hps nominal 0.3 micron recessed schottky-barrier-gate, gold metallization, and silicon nitride passivation to achieve excellent performance, uniformity, and reliability. 5965-9118e
7-162 MGS-71008 absolute maximum ratings absolute symbol parameter units maximum [1] maximum input power below 500 mhz dbm +27 above 500 mhz dbm +30 control voltage v -8.0 t stg storage temperature c -65 to 150 note: 1. operation of this device above any one of these limits may cause permanent damage. electrical specifications, t a = 25 c symbol parameters and test conditions [1] units min. typ. max. i c control input current dc m a 12 110 bw bandwidth ghz dc-3 il insertion loss 200 mhz db 0.9 1000 mhz db 1.2 1.5 2000 mhz db 1.3 2500 mhz db 1.4 3000 mhz db 1.5 iso isolation 200 mhz db 52 1000 mhz db 30 37 2000 mhz db 26 2500 mhz db 22 3000 mhz db 16 vswr voltage standing wave ration (on port) dc - 1000 mhz 1.2:1 1.4:1 j1, j2 or j3 1000- 3000 mhz 1.3:1 vswr voltage standing wave ration (off port) dc - 2000 mhz 1.2:1 j2 or j3 2000- 3000 mhz 1.3:1 i sw switching speed 10% to 90% ns 3 p 1 db [2] output @ 1 db gain compression 200 mhz dbm 16.5 1000 mhz dbm 25.2 2000 mhz dbm 25.2 ip 3 [2] 3rd order intercept 200 mhz dbm 41 1000 mhz dbm 45 2000 mhz dbm 45 notes: 1. measured in a 50 w system at 1 ghz, unless otherwise specified, v c = -5 v. 2. measured in a 50 w system with v c = -7 v.
7-163 mgs-70008 typical performance, t a = 25 c MGS-71008 truth table (typical performance at 1 ghz) control input insertion loss return loss c1 c2 j1-j2 j1-j3 j1 j2 j3 0 v 0 v 16 db 16 db 1 db 1 db 1 db for normal spdt use 0 v -5 v 37 db 1.2 db 22 db 22 db 22 db for normal spdt use -5 v 0 v 1.2 db 37 db 22 db 22 db 1 db -5 v -5 v 26 db 26 db 1 db 1 db 1 db MGS-71008 typical power performance vs. frequency and control voltage (v c ) (all other typical specifications remain constant.) v c = -7 v v c = -5 v v c = -3.3 v frequency p 1 db ip 3 p 1 db ip 3 p 1 db ip 3 200 mhz 16.5 dbm 41 dbm 16.5 dbm 41 dbm 15.5 dbm 35 dbm 1000 mhz 25.2 dbm 45 dbm 23.7 dbm 44 dbm 19.0 dbm 38 dbm 2000 mhz 25.2 dbm 45 dbm 22.5 dbm 44 dbm 18.5 dbm 38 dbm frequency (ghz) 0 -0.5 -1.0 -1.5 -2.0 insertion loss (db) 0123 figure 3. isolation vs. frequency. v control = -5 v. figure 1. insertion loss vs. frequency. v control = -5 v. figure 2. off port vswr vs. frequency. v control = -5 v. figure 5. output power vs. frequency. v control = -7 v. frequency (ghz) -10 -20 -30 -40 -50 isolation (db) 0123 frequency (ghz) 2:1 1.5:1 1:1 off port vswr 0123 figure 4. on port vswr vs. frequency. v control = -5 v. frequency (ghz) 2:1 1.5:1 1:1 on port vswr 0123 frequency (ghz) 40 30 20 10 0 p 1 db (dbm) 0123
7-164 typical scattering parameters, on switch port, z o = 50 w , t a =25 c, v c = -5 v freq. s 11 s 21 s 12 s 22 mhz mag. ang. db mag. ang. db mag. ang. mag. ang. 0.2 .05 -18.2 -.9 .90 -5.1 -.9 .904 -5.0 .05 -14.1 0.4 .05 -18.3 -.9 .90 -9.4 -.9 .9.6 -9.2 .04 -10.1 0.6 .05 -20.6 -.9 .90 -13.9 -.9 .898 -13.6 .03 -8.2 0.8 .05 -18.7 -.9 .90 -18.2 -.9 .898 -17.8 .02 8.9 1.0 .05 -20.4 -1.0 .89 -22.8 -1.0 .890 -22.3 .02 30.5 1.2 .06 -26.3 -1.0 .89 -27.8 -1.0 .893 -26.9 .01 42.3 1.4 .06 -29.1 -1.0 .89 -32.7 -1.0 .891 -31.5 .02 55.2 1.6 .07 -38.1 -1.1 .88 -37.5 -1.0 .889 -36.3 .02 59.1 1.8 .06 -46.4 -1.1 .88 -42.4 -1.1 .884 -41.5 .01 19.1 2.0 .06 -63.8 -1.2 .87 -47.8 -1.1 .879 -46.6 .01 -75.6 2.2 .06 -82.3 -1.2 .87 -53.5 -1.2 .871 -52.2 .03 -103.5 2.4 .07 -109.8 -1.3 .86 -58.5 -1.2 .867 -57.8 .05 -115.3 2.6 .08 -128.7 -1.4 .85 -63.2 -1.4 .851 -62.9 .08 -126.2 2.8 .11 -153.4 -1.5 .84 -68.7 -1.5 .838 -70.0 .11 -134.4 3.0 .14 -169.6 -1.6 .83 -74.0 -2.0 .791 -76.5 .16 -144.1 3.2 .20 178.3 -2.0 .79 -80.3 -2.5 .746 -82.8 .20 -152.8 3.4 .26 167.7 -2.3 .77 -83.8 -3.1 .700 -87.2 .26 -163.4 3.6 .31 154.5 -2.4 .76 -87.3 -3.3 .686 -93.8 .29 -168.1 3.8 .40 152.0 -2.5 .75 -90.3 -4.0 .632 -99.3 .37 -169.7 4.0 .51 145.4 -3.0 .71 -100.2 -4.6 .588 -99.6 .37 167.2 4.2 .63 139.5 -3.3 .68 -101.6 -5.4 .534 -101.6 .43 168.5 4.4 .82 133.0 -3.1 .70 -103.8 -6.1 .498 -104.6 .46 162.7 typical scattering parameters, off switch port, z o = 50 w , t a =25 c, v c = -5 v freq. s 11 s 21 s 12 s 22 ghz mag. ang. db mag. ang. db mag. ang. mag. ang. 0.2 .06 -9.8 -52.0 0 73.6 -46.0 .005 74.7 .01 146.5 0.4 .05 0 -42.4 .01 94.8 -41.9 .008 95.5 .03 130.7 0.6 .05 27.3 -36.4 .02 113.0 -36.5 .015 113.7 .05 125.1 0.8 .06 20.7 -35.2 .02 92.3 -35.4 .017 93.0 .07 116.9 1.0 .06 21.7 -33.7 .02 106.1 -33.6 .021 107.1 .08 115.7 1.2 .07 20.6 -31.4 .03 114.5 -32.0 .025 116.4 .10 114.8 1.4 .08 15.7 -30.5 .03 122.9 -29.1 .035 125.5 .12 114.6 1.6 .08 -5.6 -28.0 .04 112.0 -27.7 .041 114.2 .14 116.3 1.8 .08 -11.8 -26.0 .05 122.0 -26.2 .049 124.9 .16 115.2 2.0 .07 -17.0 -24.4 .06 121.9 -24.2 .062 125.4 .18 117.1 2.2 .08 -24.6 -21.9 .08 124.3 -22.3 .077 128.3 .21 118.5 2.4 .07 -40.0 -20.9 .09 119.5 -20.4 .095 123.5 .23 117.9 2.6 .06 -46.7 -20.0 .10 119.4 -19.6 .105 124.0 .25 117.8 2.8 .05 -66.2 -18.4 .12 119.0 -17.8 .129 122.9 .27 117.9 3.0 .05 -112.4 -16.5 .15 116.5 -16.1 .157 119.7 .30 118.0 3.2 .08 -158.0 -15.4 .17 111.0 -14.4 .191 113.1 .32 116.2 3.4 .16 170.2 -14.4 .19 100.7 -13.8 .204 100.3 .33 119.8 3.6 .23 158.7 -13.6 .21 100.8 -13.0 .223 96.7 .35 120.5 3.8 .34 146.0 -12.4 .24 97.3 -12.8 .229 90.9 .36 124.0 4.0 .45 138.0 -11.4 .27 83.0 -11.7 .260 78.3 .33 113.0 4.2 .54 129.9 -12.0 .25 82.7 -12.6 .234 78.8 .39 120.7 4.4 .65 125.4 -10.8 .29 81.1 -11.9 .253 74.5 .39 116.1
7-165 so-8 package dimensions 5.84/6.20 (.230/.244) 3.80/4.00 (.1497/.1574) pin 1 1.27 (.050) 6x 4.72/5.00 (.186/.197) 0.10/0.25 (.004/.0098) 0.33/0.51 (.013/.020) 8x 1.35/1.75 (.0532/.0688) 0.19/0.25 (.0075/.0098) 0.41/1.27 (.016/.050) 0 /8 0.38 0.10 (.015 .004) x 45 0.10 (.004) note: 1. dimensions are shown in millimeters (inches).
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