1/8 preliminary data february, 12 2003 sma428a high gain, low noise amplifier r thjs thermal resistance junction soldering point tbd o c/w symbol parameter value unit v cc device voltage 4.5 v v out voltage at pin out 4.5 v v gs voltage at pin gs 3.5 v i tot total device current 12 ma i in current into pin in 0.5 ma p tot total dissipation, t s < 125 o c 60 mw p in input power 8 dbm t op operating temperature -40 to +85 o c t stg storage temperature -65 to +150 o c t j max. operating junction temperature 150 o c order code SMA428ATR branding tbd sot323-6l (sc70) ? high gain gp = 21 db at 1.85 ghz ? low noise figure nf = 1.3 db at 1.85 ghz ? low current consumption 5.9 ma ? open collector output ? typical supply voltage: 2.4-3 v ? gain-step-mode (36db) ? ultra miniature sot323-6l package (lead free) applications ? lna for cellular market (ideal for gsm900, dcs1800 and pcs1900). ? lna for gps applications description high gain and low noise figures make the sma428a an ideal solution for low noise amplifiers and receiver front end stages up to 2.5 ghz. sma428a's typical supply voltage range is 2.4 to 3.3 volts. it shows excellent performances in terms of nf, gain and current consumption, using just 3 external matching components. applying supply voltage to the gs pin and grounding vcc pin, it provides a reduced gain step of 35 db. sma428a is housed in ultra miniature sot323-6l package(lead free), the relative dimensions are 1.15mmx1.8mm with 0.8mm thickness. absolute maximum ratings thermal resistance in, 6 gs, 4 vcc, 1 gnd, 2;5 out, 3 block diagram
sma428a 2/8 sma428a rf in 100 pf in gs 3 k w v ctrl vcc gnd out 0.5 pf rf out supply 6.8 nh 180 pf 47 pf sma428a rf in 100 pf in gs 3 k w v ctrl vcc gnd out 0.5 pf rf out supply 6.8 nh 180 pf 47 pf typical application circuit (fig. 2) test circuit (fig. 1)
3/8 sma428a electrical characteristics (ta = +25 o c, v cc = 2.7v, tested in circuit shown in fig.1, unless otherwise specified) symbol parameters test conditions min typ max unit f frequency range 1850 mhz i tot total device current 5.9 6.9 ma gp power gain 21 db nf noise figure (zs = 50 w ) 1.3 db p -1db input power at 1 db gain compression -19 dbm iip3 input third order intercept point -9.6 dbm l gs insertion loss in gain-step-mode vcc = 0.0 v, v ctrl = 2.7 v, r ctrl = 3 k w 15 db i ctr current consumption in gain-step-mode vcc = 0.0 v, v ctrl = 2.7 v, r ctrl = 3 k w 0.33 ma 3 2 1 4 5 6 (bottom view) 4 5 6 3 2 1 (top view) pin no. pin name 1vcc 2gnd 3output 4gs 5gnd 6input pin connection
sma428a 4/8 s-parameters ( z l = z s = 50 w, v cc = 2.7v, measured in application circuit shown in fig.2) 18 19 20 21 22 23 24 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f (mhz) gp (db) tc = 25 c tc = -40 c tc = 85 c -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f (mhz) irl (db) tc = 25 c tc = -40 c tc = 85 c -40 -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f ((mhz ) isl (db) tc = 25 c tc = -40 c tc = 85 c -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f (mhz ) orl (db) tc = 25 c tc = -40 c tc = 85 c
5/8 sma428a supply current vs temperature -30 -25 -20 -15 -10 -5 0 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f (mhz) gp (db) tc = 25 c tc = -40 c tc = 85 c typical performance control current vs temperature 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -40 -25 25 50 85 t (c) ictrl (ma) off-gain (vcc = 0v, vctrl = 2.7v, rctrl = 3kohm) -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 f (mhz) gp (db) tc = 25 c tc = -40 c tc = 85 c
sma428a 6/8 tape & reel dimensions mm min. typ. max a 178.5 179 179.5 c 12.8 13.0 13.5 d 20.2 n 54.5 55 55.5 t 14.4 ao 2.25 bo 2.7 ko 1.2 po 3.8 (cumulative 10 po) 4.0 4.2 (cumulative 10 po) p 4.0 device orientation top view end view 428 428 428 428
7/8 sma428a sot323-6l mechanical data mm inch min. typ. max min. typ. max a 0.8 1.1 0.031 0.043 a1 0 0.1 0 0.004 a2 0.8 1 0.0031 0.039 b 0.15 0.3 0.006 0.012 c 0.1 0.18 0.004 0.007 d 1.8 2.2 0.071 0.088 e 1.15 1.35 0.045 0.59 e 0.65 0.025 h 1.8 2.4 0.071 0.094 q 0.1 0.4 0.004 0.016 dim.
sma428a 8/8 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is registered trademark of stmicroelectronics a 2003 stmicroelectronics - all rights reserved all other names are the property of their respective owners. stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. htt p ://www.st.com
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