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1 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 1. product overview 1.1 general description the aat207 4 b2 is a gaas mmic two bit positive control digital attenuator. the device operates from dc to 2700 mhz with a control and su pply voltage of +3 v or +5 v. the aat207 4 b2 has lsb of 4 db and a total attenuation of 12 db. the aat207 4 b2 is composed of two cascade fixed attenuators. the states of attenuator are controlled by the logic level voltage. the attenuator bit values are 4 db (lsb), 8 db for a total attenuation of 12 db. attenuation accuracy is (0.15 db + 3 % of attenuation setting) @ dc~1200 mhz. 1.2 features ? 75 impedance ? attenuation: 12 db with 4 db lsb ? attenuation accuracy : (0.15 db + 3 % of atten. setting ) @dc~1200 mhz 1.3 applications ? telecommunication system ? catv and ftth 1.4 package profile & rohs compliance AAT2074B2 preliminary data sheet 75 digital attenuator 2 - bit 12 db dc~ 27 00 mhz uqfn - 14l, 2.0x2.0 mm 2 , surface mount rohs - compliant aa t2074 b2 block diagram (x - ray view)
2 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 2. summary on product performances 2.1 electrical specifications parameter test condition min typ max unit reference insertion loss (il) 50 1200 2000 2700 - 0.4 0.7 1.0 2.1 - db attenuation accuracy 1) dc C 1200 mhz dc C 2700 mhz ( 0.15 db + 3% of attenuation setting) (0. 7 db + 10% of attenuation setting) return loss dc C 1200 mhz dc C 2700 mhz 15 14 16 15 - db switching characteristics: rise/fall time on/off time (10% to 90% rf) (50% vctrl to rf) 300 320 ns input p1db 50 mhz 1 200 mhz 2000 mhz 2700 mhz - 26 21 20 15 - dbm iip3 2) 50 mhz 1200 mhz 2000 mhz 2700 mhz - 37 37 4 0 34 - dbm iip2 2) 50 mhz 860 mhz - 60 70 dbm supply voltage (vs) +3 +5 - v control voltage high low vs - 0.5 0 vs - +0.5 v current 600 ua 1) attenua tion 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 4 db high low 8 db low high 12 db high high
3 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 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 8 db attenuation state. 14 v1, dc co ntrol voltage. controls 4 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 powe r +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 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 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 bi ll of material symbol value size description manufacturer aat2074 b2 - - 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 capacito rs (c2 and c3) should be close to the rf gnd(pin 5 and pin 7).
5 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 3.2 plot of performances insertion loss normalized attenuation all states input return loss over all states output re turn loss over all states
6 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 iip3 vs. frequency over all states iip2 vs. frequency over all st ates step error vs. frequency over all states
7 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 pcb information material fr4 thickness (mm) 0.8 size (mm) 25x50 eb no. eb - 2x2 - qfn14_ att01 4. application : dc ~ 2700 mhz ( vs = +5 v, 75 ) 4.1 application circuit & evaluation board bill of material symbol value size description manufacturer aat2074 b2 - - 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 ca pacitors (c2 and c3) should be close to the rf gnd(pin 5 and pin 7).
8 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 4.2 plot of performances insertion loss normalized attenuation all states step error vs. frequency over all states input return loss over all states output return loss over all states iip3 vs. frequency over all states
9 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 5. package outline (uqfn - 14l, 2.0x2.0x0.4 mm 3 ) 6. 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 exp osed pad of the device for better rf and thermal performance, as shown in the drawing at the left side
10 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 7. tape and reel information 7.1 uqfn - 14l package
11 / 11 asb inc. ? sales@asb .co.kr j u n e 201 7 aat207 4 b2 8. 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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