1 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 1. product overview 1.1 general description the aat207 7 b2 is a gaas mmic two bit positive control digital attenuator. the device operates from dc to 1200 mhz with a control and supply voltage of +3 v or +5 v. the aat207 7 b2 has lsb of 7 db and a total attenuation of 21 db. the aat207 7 b2 is composed of two cascade fixed attenuators. the states of attenuator are c ontrolled by the logic level voltage. the attenuator bit values are 7 db (lsb), 14 db for a total attenuation of 21 db. attenuation accuracy is (0. 5 db + 10 % of attenuation setting) @ dc~1200 mhz. 1.2 f eatures ? 75 impedance ? attenuation: 21 db with 7 db lsb ? attenuation accuracy : (0. 5 db + 10 % of atten. setting ) @dc~1200 mhz 1.3 applications ? telecommunication system ? catv and ftth 1.4 package profile & rohs compliance AAT2077B2 preliminary data sheet 75 digital attenuator 2 - bit 21 db dc~ 12 00 mhz uqfn - 14l, 2.0x2.0 mm 2 , surface mount rohs - compliant aat207 7 b2 block diagram (x - ray view)
2 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 2. summary on product performances 2.1 electrical specifications supply voltage = +5 v, t a = +25 ? c, z o = 75 ?? parameter test condition min typ max unit reference insertion loss (il) 50 mhz 500 mhz 1200 mhz - 0.4 0.6 0.7 - db attenuation accuracy 1) dc C C 2) 50 mhz 1200 mhz - 37 37 - dbm iip2 2) 50 mhz 860 mhz - 60 80 dbm supply voltage (vs) +3 +5 - v control voltage high low vs - 0.5 0 vs - +0.5 v current 600 ua 1) attenuation accuracy are calculated at a ny bit or combination 2 ) iip3 and iip2 are measured with two tones at an input power of +0 dbm/tone separated by 6 mhz. 2.2 truth table state v1 v2 insertion loss l ow l ow 7 db high low 14 db low high 21 db high high
3 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 2.3 pin configuration pin description simplified outline 1, 2, 4, 6, 8, 10, 11 no connection 3 rf1, rf port 9 rf2, rf port 5 , 7 rf gnd 1 2 vs, dc power supply voltage. 1 3 v2, dc control voltage. controls 14 db attenuation state. 14 v1, dc control voltage. controls 7 db attenuation state. note: backside metal paddle is dc ground. 2.4 absolute maximum ratings parameters max. ratings operation case temperature - 40 to ? 85 ? c storage temperature - 65 to ? 150 ? c device voltage +7 v input rf power +27 dbm @ 50 mhz +22 dbm @ 1200 mhz +15 dbm @ 2700 mhz 2.5 moisture sensitivity level level 3 at 260 c reflow (intentionally blanked)
4 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 pcb information material fr4 thickness (mm) 0.8 size (mm) 25x50 eb no. eb - 2x2 - qfn14_ att01 3. application : dc ~ 1200 mhz ( vs = +5 v, 75 ) 3.1 application circuit & evaluation board bill of material symbol value size description manufacturer AAT2077B2 - - 2 - bit digital attenuator asb c1, c 4 1 ? f 0 4 0 2 dc block ing capacitor murata c2, c3 1 ? f 0 402 bypass capacitor murata c 5 10 ? f 0 8 0 5 decoupling capacitor murata note: bypass capacitors (c2 and c3) should be close to the rf gnd(pin 5 and pin 7).
5 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 3.2 plot of performances insertion loss normalized attenuation all states input return loss over all states output return loss over all states
6 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 iip3 vs. frequency over all states iip2 vs. frequency over all states step error vs. frequency over all states
7 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 4. package outline (uqfn - 14l, 2.0x2.0x0.4 mm 3 ) 5. surface mount recommendation (in mm) symbols dimensions (in mm) min nom max a 0.35 - 0. 40 a1 0 .00 - 0.05 a2 0.223 - 0. 273 a3 - 0. 127 ref - b 0. 15 0. 20 0. 25 d 1.95 2.00 2 .03 e 1.95 2.00 2.03 d1 - 1 .00bsc - e1 - 1. 00 bsc - e1 - 0. 40 bsc - e2 - 0.4 5bsc - l 0.13 0.18 0 .23 r - 0.125bsc - - 12 - 0 burr 0.00 0.03 0.06 note 1. recommended is that the ground via holes be placed on the bottom of the exposed pad of the device for better rf and thermal performance, as shown in the drawing at the left side
8 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 6. tape and reel information 6.1 uqfn - 14l package
9 / 9 asb inc. ? sales@asb .co.kr june 201 7 aat207 7 b2 7. recommended soldering reflow profile (end of datasheet) copyright ? 2017 asb inc. all rights reserved. datasheet subject to change without notice. asb assumes no responsibility for any errors which may appear in this datasheet. no part of the datasheet may be copied or reproduced in any form or by any means without the prior written consent of asb. 20~40 sec 260 ? c 200 ? c 150 ? c 60~180 sec ramp - up (3 ? c/sec) ramp - down (6 ? c/sec)
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