features l attenuation 4-db steps to 28 db l high accuracy +/- 3% l low dc power consumption: 50 ? l low intermodulation product: +50 dbm ip 3 l temperature range: -40?c to +85?c l low cost soic14 plastic package l tape and reel packaging available 1 description m/a-com? at-230 is a 3-bit, 4-db step gaas mmic digital attenuator in a low cost soic 14-lead surface mount plastic package. the at-230 is ideally suited for use where high accuracy, fast switching, very low power consumption and low intermodulation products are required. typical applications include radio and cellular equipment, wireless lans, gps equipment and other gain/level control circuits. the at-230 is fabricated with a monolithic gaas mmic using a mature 1-micron process. the process features full chip passivation for increased performance and reliability. digital attenuator, 28 db, 3-bit dc - 2 ghz at-230 so-14 parameter test conditions unit min. typ. max reference insertion loss dc ?0.1 ghz db 1.2 1.4 dc ?0.5 ghz db 1.5 1.7 dc ?1.0 ghz db 1.6 1.8 dc ?2.0 ghz db 1.8 2.1 attenuation accuracy dc ?1.0 ghz (0.15 db +3% of attenuation setting in db) db dc ?2.0 ghz (0.30 db +3% of attenuation setting in db) db vswr 1.2:1 trise, tfall 10% to 90% rf, 90% to 10% rf ns 12 ton, toff 50% control to 90% rf, 50% control to 10% rf ns 18 transients in band mv 25 1 db input power 0.05 ghz dbm 20 compression input power 0.5 ?2.0 ghz dbm 28 measured relative 0.05 ghz dbm 45 ip 2 to input power 0.5 ?2.0 ghz dbm 68 (for two-tone input power up to +5 dbm) measured relative 0.05 ghz dbm 40 ip 3 to input power 0.5 ?2.0 ghz dbm 50 (for two-tone input power up to +5 dbm) electrical specifications 1 , t a = +25? 1. all measurements at 1 ghz in a 50 system, unless otherwise specified. .013-.020 typ
(0.33-0.51)
.0040-.0098
(0.10-0.25) .2284-.2440
(5.80-6.20)
pin #14 orientation
mark pin #1 .010(0.25) m b m
.1497-.1574
(3.80-4.00) -b-
.3357-.3444
(8.55-8.75) -a-
0.050(1.27) bsc. .0532-.0688
(1.35-1.75)
.010(0.25) m c a m b s
14-lead sop outline dimensions
narrow body .150
(all dimensions per jedec no. ms-012-ab, issue c)
dimensions in ( ) are in mm. 0?8?
.0099-.0196 x 45?chamfer
(0.25-0.50) .016-.050
(0.40-1.27) .0075-.0098
(0.19-0.25) -c- ordering information part number package at-230 pin soic 14-lead plastic AT-230TR forward tape & reel at-230rtr reverse tape & reel specifications subject to change without notice. m/a-com, inc. n 1011 pawtucket boulevard, lowell, ma 01853 usa n telephone: 800-366-2266 v2.0 * if specific reel size is required, consult factory for part number assignment.
0 = vin low = 0 v to -0.2 v @ 20 *a maximum 1 = vin high = -5 v @ 10 *a typ. to -8 v @ 200 *a maximum parameter absolute maximum max. input power 50 mhz +27 dbm 500-2000 mhz +34 dbm control voltage +5 v, -8.5 v operating temperature -40? to +85? storage temperature -65? to +150? at-230 digital attenuator, 28 db, 3-bit 14 rf1 13 gnd 12 gnd 11 gnd 10 gnd 9 gnd 8 rf2 vc2 vc2 1 2 3 4 5 6 7 vc1 vc1 vc3 vc3 gnd 16 db 8 db 4db functional schematic absolute maximum ratings 1 1. operation of this device above any one of these parameters may cause permanent damage truth table vswr vs frequency 0.5 1.0 1.5 2.0 2.0 1.4 0 vswr frequency (ghz) 1.8 1.6 1.2 1 4 db atten insertion loss 8 db atten 16 db atten typical performance attenuation vs frequency 0.5 1.0 1.5 2.0 0 -2 0 loss (db) frequency (ghz) -10 -12 -16 -4 -6 -8 -14 -18 -20 -22 -24 -26 -28 -30 -32 attenuation accuracy vs frequency 0.5 1.0 1.5 2.0 1.5 0 0 frequency (ghz) 1 0.5 -0.5 -1 4 db atten 8 db atten 16 db atten -1.5 28 db atten nominal attenuation (db)
insertion loss vs frequency 0.5 1.0 1.5 2.0 3.0 0 loss (db) frequency (ghz) 2.0 1.0 0 +85 c -40 c +25 c control input vc3 vc3 vc2 vc2 vc1 vc1 atten (db) 1 0 1 0 1 0 reference 0 1 1 0 1 0 4 db 1 0 0 1 1 0 8 db 1 0 1 0 0 1 16 db 0 1 0 1 0 1 28 db m/a-com, inc. n 1011 pawtucket boulevard, lowell, ma 01853 usa n telephone: 800-366-2266 specifications subject to change without notice. v2.0
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