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tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier 48- pin 7x7mm leadless smt p ackage applications ? ? ? ? forward p ath v ariable g ain amplifier functional block diagram ordering information part no. description ta t2814a 1l docsis 3.0 edge qam variable gain amplifier tat2814a 1l- e b evaluation board standard t ?/ ? r size = 1000 pieces on a 7 ? reel product features ? ?db typical performance ? < ? 5 watt n ominal power c onsumption ? 45? ? ?1003? mhz bandwidth ? low - reflection differential input?/?output s tages ? 18 ?db typical return loss across gain r ange ? variable g ain a ttenuator: 18 ? db t ypical r ange ? 30? db t ypical m ax g ain ? +49 ? dbm t ypical oip3 ? 2.7 ? db t ypical n oise f igure ? typical input s tage b ias: + 5 ? v, 290 ? ma ? typical output stage b ias: + 8 ? v, 415 ? ma general description the tat2814a 1l is an rfic for docsis 3.0 output sections, such as cmts and edge qam. it combines a low - reflection differential input stage, a variable gain attenuator and an eff icient output amplifier to provide significant reduction in power consumption and pc board space. it replaces circuitry requiring up to 10x the board space and 2x the power. the tat2814a 1l meets the stringent docsis 3.0 output linearity specifications wit h extra margin to overcome additional losses before the output connector. the tat2814a 1l is packaged in an industry standard 7 ? x ? 7 ? mm 48 - pin leadless smt package and consumes 5 ? w between a + 5 ? v input amplifier supply and an + 8 ? v output amplifier supply. the tat2814a 1l utilizes proven gaas phemt to optimize performance and cost. it allows the designer to optimize output stage vol tage to significantly reduce power consumption in edge qam applications. . datasheet: rev . h 1 1 - 1 2 - 14 - 1 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier recommended operating conditions parameter min typ max units v dd - stage 1 +5 v v pa - stage 2 +8 v operating ambient temp . ?40 ?c ?c absolute maximum ratings parameter rating storage temperature ? ? ? ? electrical specifications test conditions unless otherwise noted: v dd ?= ?+ 5? v, v pa =?+8?v, t ambient = + 25?c , i ncludes input and output balun losses parameter conditions min typ max units operational frequency range 45 1003 mhz gain i agc = 1?ma , f= 1003?mhz 27.5 30 32 db gain variation over temp ? ( 1 ) maximum gain deviation within passband within temp. range of ?40?c to +85?c relative to +25?c. ?1.4 ? 1.0 db attenuator range max gain - min gain 18 db input return loss i agc = 1?ma 18 db output return loss i agc = 1?ma dbmv?/ ?chan. next - adjacent channel (1, 3) third - adjacent channel (1, 4) eqam vout? ( 1, 5) single channel harmonics +63 +64 dbmv output p1db +28 dbm output ip3 pout=+8?dbm/tone, 6?mhz tone spacing +49 dbm noise figure 2.7 db 1 st stage current v dd =+5?v 290 330 ma 2 nd stage current v pa =+5?v 415 450 ma power down dc co ntrol pin 12) input high voltage 1.8 v input low voltage 0.5 input high current 300 ua input low current ? -50 agc input current (pin 14) ?40 ?1 ma thermal resistance, jc? ? c/w notes: 1. production tested at 66 and 990?mhz. 2. ad jacent channel (750?khz from channel block edge to 6?mhz from channel block edge) better than ?60?dbc. 3. next - adjacent channel (6?mhz from channel block edge to 12?mhz from channel block edge) better than ??63?dbc. 4. third - adjacent channel (12?mhz from channel block edge to 18?mhz from channel block edge) better than ?65?dbc. 5. in each of 2n contiguous 6?mhz channels or in each of 3n contiguous 6?mhz channels coinciding with 2 nd harmonic and with 3 rd harmonic components, respectively (up to 1002?mhz) better than ?63?dbc. . 6. ? jb = ( tj max - t groundslug )/p diss , where p diss = power dissipated in the 2 nd stage amplifier (power amplifier) datasheet: rev . h 1 1 - 1 2 - 14 - 2 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier tat2814a1l - eb schematic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 subckt 1 2 3 4 subckt 1 2 3 4 5 6 subckt id=u5 n e t="mb t3904" 1 2 3 4 5 6 7 8 subckt rf i nput c15 l1 u3 c1 c2 c10 c9 c3 c4 c35 r4 r1 r3 l7 r7 r34 r31 r13 u5 r29 l6 c26 l5 r11 r2 l12 l14 r12 c19 r16 c16 c20 c21 c13 vagc vpre pd1 vpre tat2814 vpa pd1 vagc c41 l18 c35 r24 c7 c8 l15 c22 l17 vpa gnd vagc pd1 vpre j1 vpre r35 note: r3 and r4 required for matching and stability of input amplifie c datasheet: rev . h 1 1 - 1 2 - 14 - 3 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier bill of material ? tat2814a1l - eb reference des. value description manuf. part number u1 variable gain amplifier, qfn 7 ? x ? 7 triquint tat2814a c1, c2, c20, c21 0.01 ?f ? ?pf ?f ceramic cap, 0603, x7r, 50 ? v,5% var ious c9, c10, c13, c14, c15, c16, c17, c36, r7, r10 dnp no load parts l1 1.8 ? ? ? ? ? ?h ? ? ? ? ? ? ? ? ? ? ? ? 1200? mhz m/a - com maba - 009210 - ct1760 u5 npn trans, dual npn, sot363 various datasheet: rev . h 1 1 - 1 2 - 14 - 4 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier typical performance ? tat2814a1l - eb 25 27 29 31 33 35 0 200 400 600 800 1000 gain (db) frequency (mhz) gain vs. frequency +85 c +25 c ?40 c 8 12 16 20 24 28 32 0 8 16 24 32 40 gain (db) agc current (ma) gain vs. agc current freq.=500 mhz temp.=+25 c 0 2 4 6 8 10 12 14 0 200 400 600 800 1000 nf (db) frequency (mhz) noise figure vs. frequency 36 ma 21 ma 11 ma 1 ma 0 1 2 3 4 5 0 200 400 600 800 1000 nf(db) frequency (mhz) noise figure vs. frequency +85 c +25 c ?40 c i agc =1 ma -30 -25 -20 -15 -10 -5 0 0 200 400 600 800 1000 |s11| , |s22| (db) frequency (mhz) return loss vs. frequency temp.=+25 c |s22| |s11| agc current=1 ma -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 100 300 500 700 900 1100 harmonic (dbc) frequency (mhz) harmonics at docsis +4 -40c +25c +85c 2x66mhz 3x66mhz 2x330mhz 3x330mhz datasheet: rev . h 1 1 - 1 2 - 14 - 5 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier typical performance ? tat2814a1l - eb measurements at 990 ? mhz taken using a high pass filter to minimize contributions from the source -70 -68 -66 -64 -62 -60 0 200 400 600 800 1000 acpr2 (dbc) frequency (mhz) acpr2 over temperature 4 - ch docsis+4, 750 khz - 6 mhz +85 c +25 c ?40 c -70 -68 -66 -64 -62 -60 0 200 400 600 800 1000 acpr3 (dbc) frequency (mhz) acpr3 over temperature 4 - ch docsis+4, 6 mhz - 12 mhz +85 c +25 c ?40 ?40 datasheet: rev . h 1 1 - 1 2 - 14 - 6 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier 1200 mhz performance ? tat2814a1l - eb 25 27 29 31 33 35 0 200 400 600 800 1000 1200 gain (db) frequency (mhz) gain vs. frequency temp.=+25 c -30 -25 -20 -15 -10 -5 0 0 200 400 600 800 1000 1200 |s11| (db) frequency (mhz) input return loss vs. frequency temp.=+25 c -30 -25 -20 -15 -10 -5 0 0 200 400 600 800 1000 1200 |s22| (db) frequency (mhz) output return loss vs. frequency temp.=+25 c 0 1 2 3 4 5 0 200 400 600 800 1000 1200 nf (db) frequency (mhz) noise figure vs. frequency temp.=+25 c v agc =+1.2 v agc current=1 ma datasheet: rev . h 1 1 - 1 2 - 14 - 7 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier detailed device description balance the tat2814a 1l is designed for excellent differential - mode performance throughout the chain. unlike many commercially available push - pull amplifiers built with 2 discrete die, both stages of the tat2814a 1l are single - chip designs utilizing a differential pair topology for best common - mode performance. provision is made for using external bias inductors to increase tail impedances in the input differential pairs, improving further the signal balance and 2 nd order performance through the chain. the rf output of the first st age is connected internally to the differential attenuator and brought out to external pins for applying stage bias and enabling rf feedback to the input. the attenuator outputs are brought out to a single side of the tat2814a 1l for customers desiring to perform inter - stage filtering or signal processing. the differential inputs to the output stage are located on an adjacent side of the die, spaced to minimize package coupling so as to not limit the performance of off - stage filtering. input matching the input stage uses external feedback to achieve 75 ? ? differential input impedance. the bias current of the input stage may be adjusted with an external resistor to ground. pre - amp powerdown the preamp stage of the tat2814a 1l can be powered down by setting pd pin to logic low. v dd pins should be set to 5 ? v in both power - down and operating modes. gain adjustment a fully differential gain control function is implemented with a low distortion analog diode - based attenuator. the attenuator provides for monoton ic gain adjustment over a full 18 ? db attenuation range. the excellent rf match characteristics ensure excellent gain flatness and return loss over the full attenuation range. control is provided by a single current controlled line. attenuation is monoton ic and linear with control current. output stage a differential output stage has excellent output linearity performance at very low power. the differential outputs of the second stage may be combined with a commercially available balun to provide for sing le - ended drive signals. the bias current of the output stage may be placed in active bias control. this is implemented by sensing the voltage at pin 19 and providing a feedback voltage bias to pin 27. please contact triquint for further details. thermal management total maximum power consumption of the tat2814a 1l is 5.25 watts. care must be taken in the layout to provide adequate thermal path with multiple vias under the tat2814a 1l . a heat sink should also be used to carry heat away from the backside pc b. see section on mechanical information for recommended mounting pattern for the part. technology the tat2814a 1l utilizes proven phemt device technology that has yielded over 200 million rfics to date. for detailed qualification and reliability report s on other products fabricated in this process, please consult triquint. key rfics that will be used in the tat2814a 1l have already exceeded industry qualification requirements in other packages. bias current set bias current to each amplification stage is set by external circuitry to allow trade - off of power consumption and distortion performance. separate bias voltage for each stage preamplifier, interstage attenuator, and driver amplifier have independent voltage supply pins. datasheet: rev . h 1 1 - 1 2 - 14 - 8 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier pin configuration an d description 25 26 27 28 29 30 31 32 33 34 35 36 2 3 5 4 6 7 8 9 1 12 11 10 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 nc rfin1_p src1 src1 rfin1_n nc nc nc rfout1_n nc nc pd nc agc nc vddatt vddatt vg2_adj id2_sense vpa rfout2_n gnd gnd rfout2_p vpa gnd id2_adj nc nc rfin2_p nc rfin2_n nc nc nc nc nc nc nc rfout_att_n rfout_att_p nc nc nc nc rfout1_p nc nc pin no. label description 1, 6 ? ? ? 8, 10, 11, 13, 15, 28, 29, 31, 33 ? ? ? 39, 42 ? ? ? 45, 47, 48 nc no connect 2 rfin1_p preamp rf input, positive 3, 4 src1 preamp rf source 5 rfin1_n preamp rf input, negative 9 rfout1_n preamp rf output, negative 12 pd power down control 14 agc current based attenuator control 16, 17 vddatt attenuator bias 18 vg2_adj power amplifier vg2 bias adjust 19 id2_sense power amplifier current sense 20, 25 vpa power amplifier supply 21 rfout2_n power amplifi er rf output, negative 22, 23, 26 gnd ground pin 24 rfout2_p power amplifier rf output, positive 27 id2_adj power amplifier bias current adjust (optional) 30 rfin2_p power amplifier rf input, positive 32 rfin2_n power amplifier rf input, negative 40 rfout_att_n attenuator rf output, negative 41 rfout_att_p attenuator rf output, positive 46 rfout1_p preamp rf output, positive backside pad gnd backside ground slug datasheet: rev . h 1 1 - 1 2 - 14 - 9 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier package marking and dimensions this package is lead - free/rohs - compliant. the plating material on the leads is 100 % matte tin. it is compatible with both lead - free (maximum 260 c reflow temperature) and lead (maximum 245 c reflow temperature) soldering processes. the tat2814a will be marked with a ?tat2814a? de signator and an 8 digit alphanumeric lot code (yywwcccc). the first four digits are a date code consisting of the year and work week (yyww) of assembly. the last four digits are the lot code (xxxx). datasheet: rev . h 1 1 - 1 2 - 14 - 10 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier pcb mounting pattern datasheet: rev . h 1 1 - 1 2 - 14 - 11 of 1 2 - disclaimer: subject to change without notice ? 2014 triquint www.triquint.com
tat2814a 1l d ocsis 3.0 ? / ? edge ? qam? variable ? gain ? amplifier product compliance information esd sensitivity ratings caution! esd - sensitive device esd rating: class 1a value: ?250 v to

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