t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 1 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com sot - 89 package applications ? single - ended and push - pull optical receivers ? low - noise drop amplifiers ? distribution amplifiers ? multi - dwelling units ? single - ended gain block product features ? gain, return loss and bias externally adjustable ? on - chip active bias for consistent bias current and repeatable performance ? dc C 2000 mhz bandwidth ? low noise: typical nf < 2 db to 1000mhz ? flexible 5 v to 8 v biasing ? i dd = 120 ma typical at v dd 5v in appl ication circuit ? 19 db typical gain in application circuit ? +40 dbm typical oip3 ? +61 dbm typical oip2 ? +21 dbm typical p1db ? low distortion: cso - 66 dbc, ctb - 78 dbc ? ( 10 dbmv/ch at in put , 80 ch ntsc flat) ? phemt device technology ? sot - 89 package ordering info rmation part no. description tat7457 75 ? high linearity phemt amplifier tat7457 - eb assembled evaluation board standard t/r size = 10 00 pieces on a 7 reel. functional block diagram general description the tat7457 is a low cost rf amplifi er designed for applications from dc to 2000 mhz. the balance of low noise and distortion provides an ideal solution for a wide range of broadband amplifiers used in cable television applications such as optical receivers and low noise front ends. the ta t7457 has features allowing a great deal of design - in flexibility. gain and return loss are adjustable with an external feedback resistor. an internal bias circuit mitigates the effect of temperature and process variation and an external resistor may be used to adjust the bias current to optimize distortion or noise performance. there are no on - chip capacitors limiting the low freq response which extends down to dc. the tat7457 is fabricated using 6 - inch gaas phemt technology to optimize performance and c ost. it provides excellent gain and return loss consistency inherent to the phemt process. pin configuration pin no. label 1 rf in 2 gnd 3 rf out /v dd back side paddle g nd r f i n g n d r f o u t / v d d 1 2 3 b a c k s i d e p a d d l e - g n d e x t e r n a l f e e d b a c k c i r c u i t f o r g a i n a n d r e t u r n l o s s a d j u s t m e n t .
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 2 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com recommended operating conditions parameter min typ max units v dd 5 8 v i dd 1 20 ma tj for >10 6 hours mttf +1 5 0 c electrical specifications are measured at specified test conditions. specifications are not guaranteed over a ll recommended operating conditions. absolute maximum ratings parameter rating storage temperature - 6 5 to 150c device voltage (v dd ) + 10 v operation of this devi ce outside the parameter ranges given above may cause permanent damage. electrical sp ecifications test conditions unless otherwise noted: v dd =+5 v, temp= +25c , freq.= dc to 1200 mhz parameter conditions min typ max units operational frequency range dc 1200 mhz gain 50 - 1000 mhz 19 db gain flatness +/ - 0.7 db noise figure 2. 0 db input return loss 18 db output return loss 18 db gain 50 - 1200 mhz 19 db gain flatness +/ - 0.7 db noise figure 2.3 db input return loss 14 db output return loss 17 db output p1db +21 dbm output ip2 f1=225 mhz, f2=325 mh z pout = +5 dbm/tone +61 dbm output ip3 + 40 dbm cso 10 dbmv/ch annel at in put , flat loading, 8 0 ch annels ntsc +qam upto 1 218 mhz. - 66 dbc ctb - 78 dbc thermal resistance, jc junction to case 38 c/w
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 3 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com reference design ? dc - 1200 mhz bill of material reference des. value description manuf. part number u1 amplifier, sot - 89 triquint tat7457 r1 1 k thick film res., 0402, 1% various r2 0 thick film res., 1206 various r3 n/l r4 0 thick film res., 0402 various r5 75 k thick film res., 0402, 1% various c1, c2 0.01 uf ceramic cap, 0603, x7r, 16v, 10% various c3, c4 0.01 uf ceramic cap, 0402, x7r, 16v, 10% various c5, c6 0.1 uf ceramic cap, 0603, x7r, 16v, 10% various l1, l2 4.7 nh ceramic wire - wound ind, 0402, 5% various l3 880 nh ferrite ind., vertical wire - wound, 1206, 10% various l4 910 nh ferrite ind., vertical wire - wound, 1008, 10% various evaluation board pcb stack up and material c6 c5 l4 c4 l3 r2 c3 r1 c1 c2 l1 l2 r3 r4 r5 1 2 3 u1 1 1 1 1 o z . c u b o t t o m l a y e r f r 4 1 o z . c u t o p l a y e r 0 . 0 6 2 0 . 0 0 6 f i n i s h e d b o a r d t h i c k n e s s
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 4 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com performance plots ? v dd ? = ? +5 v test conditions unless otherwise noted: v dd =+5 v, i dd = 1 2 0 ma (typ.) 15 16 17 18 19 20 21 22 23 24 25 0 325 650 975 1300 s21 (db) freq (mhz) gain +85 c +25 c ?40 c - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 325 650 975 1300 s11 (db) freq (mhz) input return loss +85 c +25 c - 40 c -100 -90 -80 -70 -60 -50 0 100 200 300 400 500 600 cso & ctb (dbc) frequency (mhz) cso & ctb ctb +85 c ctb +25 c ctb ?40 c cso +85 c cso +25 c cso ?40 c 80 ch ntsc + qam (at 6db offset) upto 1218 mhz , flat loading, pin = 10 dbmv/ch. - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 325 650 975 1300 s22 (db) freq (mhz) output return loss +85 c +25 c - 40 c 0 . 0 0 . 8 1 . 6 2 . 4 3 . 2 4 . 0 0 325 650 975 1300 nf (db) freq (mhz) noise figure + 85 c + 25 c ? 40 c
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 5 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com performance plots ? v dd ? = ? +8 v test conditions unless otherwise noted: v dd =+ 8 v, i dd = 1 4 0 ma idd adjusted with an external supply, similar to adjusting r3 and r5. 15 16 17 18 19 20 21 22 23 24 25 0 325 650 975 1300 s21 (db) freq (mhz) gain - 40 0 c +25 0 c +85 0 c - 40 0 c +25 0 c +85 0 c - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 325 650 975 1300 s11 (db) freq (mhz) input return loss - 40 0 c +25 0 c +85 0 c - 100 - 95 - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 0 100 200 300 400 500 600 cso & ctb (dbc) freq (mhz) cso & ctb 80 ch ntsc @ +10 dbmv/ch flat input ctb - 40 0 c ctb +25 0 c ctb +85 0 c cso - 40 0 c cso +25 0 c cso +85 0 c - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 325 650 975 1300 s22 (db) freq (mhz) output return loss - 40 0 c +25 0 c +85 0 c 0 1 2 3 4 5 6 0 325 650 975 1300 nf (db) freq (mhz) noise figure - 40 0 c +25 0 c +85 0 c
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 6 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com bill of material ? 2.0 ghz satellite reference des. value description manuf. part number u1 amplifier, sot - 89 triquint tat7457 r1 750 thick film res., 0402, 1% various r5 75 k thick film res., 0402, 1% various c1, c2 0.01 uf ceramic cap, 0603, x7r, 16v, 10% various c3 560 pf ceramic cap, 0402, x7r, 16v, 10% various c4 0.01 uf ceramic cap, 0402, x7r, 16v, 10% various cin 0.5 pf ceramic cap, 0603, .1 pf various l1 2.7 nh ceramic wire - wound ind, 0402, 5% var ious l2 2.0 nh ceramic wire - wound ind, 0402, 5% various l3 880 uh ferrite ind., vertical wire - wound, 1206, 10% various reference design ? 2.0 ghz satellite
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 7 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com performance plots ? 2.0 ghz satellite test conditions unless otherwise noted: v dd =+5 v, i dd = 120 ma (typ.), temp=+25c 13 14 15 16 17 18 19 20 21 22 23 0 600 1200 1800 2400 s21 (db) freq (mhz) gain - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 600 1200 1800 2400 s11 (db) freq (mhz) input return loss - 100 - 95 - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 0 100 200 300 400 500 600 cso & ctb (dbc) freq (mhz) cso & ctb 80 ch ntsc @ +8 dbmv/ch flat input ctb cso - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 600 1200 1800 2400 s22 (db) freq (mhz) output return loss 0.0 0.8 1.6 2.4 3.2 4.0 0 600 1200 1800 2400 nf (db) freq (mhz) noise figure
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 8 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com detailed device description the tat7457 was designed to be a low cost general purp ose amplifier suitable for a wide range of applications. the tat7457 is a high gain cascode amplifier with no internal shunt feedback. an on - chip biasing network sets the operating conditions for the fets. this network stabilizes bias current against ch anges in temperature as well as against the normal process variations expected from wafer to wafer. stabilized bias current will lead to more consistent rf performance. customers may set the gain and return loss of their amplifier by selecting an appr opriate external feedback resistor. reducing the value of the feedback resistor will reduce the gain and lower the input and output impedances. low noise tia designers may set the value of feedback to a high value (>1k ohm) for best performance. the re are no on - chip capacitors that limit the low frequency response, enabling the tat7457 frequency response to extend to dc. the open loop gain (no external feedback) and high frequency gain performance is shown in the plot to the left. biasing option s for improved performance distortion and noise performance may be optimized with simple changes to the application circuit. noise performance may be improved by adding a large resistor r3 of approximately 20 k to ground. this resistor will reduce t he bias current and improve noise. best distortion occurs on a 6v supply; however for improved distortion on a 5v supply, bias current may be increased by adding a large pull up resistor r5 of approximately 75 k in parallel with the feedback capacitor. 1 2 3 1 2 3 bias network large cascode rfic schematic simplified 1 2 3 biasing through tat 7457 feedback resistor 0.1uf application schematic fig. 1 vna bias tee 1 0 2 4 6 frequency (ghz) tat7457 open loop gain in 75 ohms 0 5 10 15 20 25 30 s21 (db) -30 -25 -20 -15 -10 -5 0 return losses (db) db(|s(2,1)|) (l) no feedback db(|s(2,2)|) (r) no feedback db(|s(1,1)|) (r) no feedback
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 9 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com package marking and dimensions marking: part number C tat 745 7 lot code C xxxx yyww pcb mounting pattern notes: 1. ground / thermal vias are critical for the proper performance of this device. vias should use a .35 mm (#80/.0135) diameter drill and have a final, plated thru diameter of .25 mm (.010). 2. add as much copper as possible to inner and outer layers near the part to ensure optimal thermal performance. 3. rf trace width depends upon the pc board material a nd construction. 4. all dimensions are in millimeters (inches). angles are in degrees. tat745 7 xxxxyyww
t at74 57 75 phemt adjustable gain rf amplifier datasheet: rev g 09 - 16 - 14 - 10 of 10 - disclaimer: subject to change without notice ? 2013 triquint www.triquint.com product compliance information esd sensitivity ratings caution! esd - sensitive device esd rating: class 1 a value: passes passes solderability comp atible with both lead - free (260 c max imum refl ow temperature) and tin/lead (245 c max imum reflow temperature) soldering processes. contact plating: annealed matte tin over copper. rohs compliance this part is compliant with eu 2002/95/ec rohs directive (restrictions on the use of certain hazardou s substances in electrical and electronic equipment). this product also has the following attributes: ? ? ? ? 15 h 12 br 4 0 2 ) free ? ? msl rating msl rating: level 3 te st: 260c convection reflow standard: jedec standard ipc/jedec j - std - 020 contact information for the latest specifications, additional product information, worldwide sales and distribution locations, and information about triquint: web: www.triquint.com tel: +1. 707.526.4498 email: info - sales@tqs.com fax: +1. 707.526.1485 for technical questions and application information: email: sjcapplications.engineering@tqs.com important notice the information contained herein is believed to be reliable. triquint makes no warranties regarding the information contained herein. triquint assumes no re sponsibility or liability whatsoever for any of the information contained herein. triquint assumes no responsibility or liability whatsoever for the use of the information contained herein. the information contained herein is provided "as is, where is" a nd with all faults, and the entire risk associated with such information is entirely with the user. all information contained herein is subject to change without notice. customers should obtain and verify the latest relevant information before placing or ders for triquint products. the information contained herein or any use of such information does not grant, explicitly or implicitly, to any party any patent rights, licenses, or any other intellectual property rights, whether with regard to such informat ion itself or anything described by such information. triquint products are not warranted or authorized for use as critical components in medical, life - saving, or life - sustaining applications, or other applications where a failure would reasonably be exp ected to cause severe personal injury or death.
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