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for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. for small orders, phone 1-800-835-8769. general description the max2472/max2473 are flexible, wideband, high- reverse-isolation buffer amplifiers. the max2472 has dual open-collector outputs capable of delivering -5dbm into 50 while maintaining harmonic suppression below -25dbc. the max2473 has a single open-collector output with a bias control pin to vary output power from -10dbm to -2dbm while maintaining harmonic suppression below -25dbc. the max2472/max2473? combination of high reverse isolation and low supply current makes them ideal for applications requiring high performance with low power. they feature high input impedance and open-col- lector outputs for maximum flexibility, enabling them to be used with a variety of oscillator topologies. both the max2472 and max2473 operate from a single +2.7v to +5.5v supply. with v cc = +3.0v and -25dbm input power, the max2472 consumes 5.2ma, while the max2473 consumes only 2.7ma. both devices are avail- able in a tiny 6-pin sot23 package requiring minimal board space. applications cellular and pcs mobile phones private mobile radios ism-band applications if/rf oscillators general-purpose buffers/amplifiers typical operating circuits appear at end of data sheet. features ? +2.7v to +5.5v supply range ? 500mhz to 2500mhz input frequency range ? high reverse isolation: 49db at 900mhz ? dual open-collector outputs (max2472) ? adjustable -10dbm to -2dbm output power control (max2473) ? high input impedance: >250 at 900mhz ? ultra-small sot23-6 package max2472/max2473 500mhz to 2500mhz vco buffer amplifiers ________________________________________________________________ maxim integrated products 1 functional diagrams 19-1466; rev 0; 6/99 part max2472 eut-t max2473 eut-t -40? to +85? -40? to +85? temp. range pin- package 6 sot23-6 6 sot23-6 evaluation kit manual follows data sheet ordering information sot top mark aaaz aaba gnd gnd out2 out1 in v cc max2472 bias gnd gnd bias out in v cc max2473 bias gnd in out2 (bias) 16 v cc 5 gnd out1 (out) max2472 max2473 sot23-6 top view ( ) are for max2473. 2 34 pin configuration
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +2.7v to +5.5v, p in = -25dbm, in driven from a 50 source, out_ lc-matched to 50 , t a = t min to t max , unless otherwise noted. typical values are at v cc = +3v, t a = +25?.) (note 1) ac electrical characteristics?ax2472 ( typical operating circuits , v cc = +3v, p in = -25dbm, in driven from a 50 source, out1 and out2 lc matched to 50 , t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ..............................................................-0.3v to +7v out1, out2, bias to gnd........................-0.3v to (v cc + 0.3v) maximum bias pin current................................................150? maximum input power....................................................+10dbm continuous power dissipation sot23-6 (derate 8.7mw/? above +70?)...................696mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? conditions 2.7 ma 5.2 8.0 i cc v 2.7 5.5 v cc input voltage range supply current 4.8 5.1 2.5 4.3 units min typ max symbol parameter max2473, r bias = 23k max2473, r bias = 11k max2472 no drive max2472 max2473, r bias = 23k max2473, r bias = 11k dbm ? s 12 ? 2 ? s 21 ? 2 f in = 900mhz, t a = +25? transducer gain (in to out2) f in = 600mhz f in = 900mhz db 9.2 f in = 900mhz f in = 2400mhz f in = 1900mhz f in = 600mhz 40 f in = 1900mhz f in = 2400mhz f in = 900mhz f in = 900mhz, t a = t min to t max (note 3) conditions db 6.6 14.6 f in = 600mhz 13.0 ? s 21 ? 2 f in = 2400mhz 5.3 f in = 1900mhz 6.8 transducer gain (in to out1) db 7.8 10.2 12.2 14.0 mhz 500 2500 f in input frequency range (note 2) 26 30 43 reverse isolation (in to out2) 7.5 6.0 -3.2 p out1db output 1db compression point units min typ max symbol parameter
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers _______________________________________________________________________________________ 3 note 1: limits are 100% production tested at t a = +25?. limits over the entire operating temperature range are guaranteed by design and characterization but are not production tested. note 2: this is the recommended operating frequency range. the parts have been characterized over the specified frequency range and production tested at 900mhz. operation outside of this range is possible but not guaranteed. note 3: guaranteed by design and characterization. p out = -5dbm, f in = 900mhz f in = 900mhz f in = 1900mhz f in = 900mhz conditions dbc -25 db 24 isolation (out1 to out2) 10.2 9.5 nf noise figure units min typ max symbol parameter harmonic suppression db f in = 900mhz, t a = +25? f in = 600mhz f in = 1900mhz f in = 900mhz p out = -5dbm, f in = 900mhz f in = 600mhz f in = 1900mhz f in = 2400mhz f in = 900mhz f in = 900mhz f in = 2400mhz conditions harmonic suppression db dbc -25 9.2 db 29 nf noise figure 6.8 11.8 16.8 14.8 ? s 21 ? 2 mhz 500 2500 f in input frequency range (note 2) 35 ? s 12 ? 2 48 50 reverse isolation 7.6 7.2 -6.0 p out1db output 1db compression point units min typ max symbol parameter ac electrical characteristics?ax2473 ( typical operating circuits , v cc = +3v, p in = -25dbm, r bias = 15k , in driven from a 50 source, out lc matched to 50 , t a = +25?, unless otherwise noted.) dbm -0.9 r bias = 23k r bias = 11k f in = 1900mhz 9.9 transducer gain db f in = 900mhz, t a = t min to t max (note 3) 6.4 19.0 ? s 12 ? 2 f in = 900mhz f in = 2400mhz f in = 1900mhz f in = 600mhz 49 db 30 34 54 reverse isolation (in to out1) ac electrical characteristics?ax2472 (continued) ( typical operating circuits , v cc = +3v, p in = -25dbm, in driven from a 50 source, out1 and out2 lc matched to 50 , t a = +25?, unless otherwise noted.)
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 4 _______________________________________________________________________________________ typical operating characteristics (max2472/max2473 ev kit, v cc = +3v, t a = +25?, unless otherwise noted.) 5.0 4.0 6.0 7.0 -40 -20 0 20 40 60 80 supply current vs. temperature max2472 toc01 temperature (?) i cc (ma) p in = -20dbm f in = 900mhz v cc = 3v v cc = 5v 0 4 2 10 8 6 14 12 -50 10 30 -30 -10 50 70 90 s 21 2 vs. temperature max2472 toc02 temperature (?) f in = 600mhz f in = 900mhz f in = 1900mhz f in = 2400mhz p in = -20dbm s 21 2 (db) 0 2 4 6 10 8 12 14 -20 -16 -14 -18 -12 -10 -8 -6 -4 -2 0 s 21 2 vs. output power max2472 toc03 p out (dbm) for out1 with out2 reactively matched and terminated f in = 600mhz f in = 900mhz f in = 2400mhz s 21 2 (db) f in = 1900mhz s 21 max2472 toc07 a c b d (3 units full scale) for out2 with out1 biased and terminated a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz s 11 max2472 toc06 a c b d for out2 with out1 biased and terminated a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz s 12 max2472 toc08 a c b d (0.1 units full scale) for out2 with out1 biased and terminated a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz s 22 max2472 toc09 a c b d for out2 with out1 biased and terminated a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz max2472
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers _______________________________________________________________________________________ 5 typical operating characteristics (continued) (max2472/max2473 ev kit, v cc = +3v, t a = +25?, unless otherwise noted.) max2472 scattering parameters (in to out 2)
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (max2472/max2473 ev kit, v cc = +3v, t a = +25?, unless otherwise noted.) 0 8 6 4 2 12 10 14 16 18 20 -20 -10 -5 -15 0 5 max2472 toc13d p out (dbm) r bias = 11k w r bias = 15k w r bias = 22k w s 21 2 (db) s 21 2 vs. output power f in = 600mhz 0 8 6 4 2 12 10 14 16 18 20 -25 -15 -10 -20 -5 0 max2472 toc13a p out (dbm) r bias = 11k w r bias = 15k w r bias = 22k w s 21 2 vs. output power s 21 2 (db) f in = 2400mhz 0 8 6 4 2 12 10 14 16 18 20 -20 -10 -5 -15 0 max2472 toc13b p out (dbm) r bias = 11k w f in = 1900mhz r bias = 15k w r bias = 22k w s 21 2 (db) s 21 2 vs. output power 0 8 6 4 2 12 10 14 16 18 20 -20 -12 -8 -16 -4 0 max2472 toc13c p out (dbm) r bias = 11k w r bias = 15k w r bias = 22k w s 21 2 (db) s 21 2 vs. output power f in = 900mhz 0 2 1 4 3 6 5 7 9 8 10 50 40 35 45 30 25 20 15 10 supply current vs. r bias max2472 toc11 r bias (k w ) i cc (ma) v cc = 5v v cc = 3v 0 4 2 10 8 6 16 14 12 18 -50 025 -25 50 75 100 max2472 toc12 temperature (?) f in = 600mhz f in = 900mhz f in = 1900mhz f in = 2400mhz p in = -20dbm r bias = 15k w s 21 2 (db) s 21 2 vs. temperature max2473
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers _______________________________________________________________________________________ 7 typical operating characteristics (continued) (max2472/max2473 ev kit, v cc = +3v, t a = +25?, unless otherwise noted.) s 11 max2472 toc16 r bias = 15k w a c b d a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz -60 -55 -50 -45 -40 -35 -30 010 5 152025303540 reverse isolation vs. r bias max2472 toc15 r bias (k w ) reverse isolation (db) f in = 900mhz max2473 s 12 max2472 toc17 (0.1 units full scale) r bias = 15k w a c b d a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz s 21 max2472 toc18 (3 units full scale) r bias = 15k w a c b d a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz s 22 max2472 toc19 r bias = 15k w a c b d a: f in = 600mhz b: f in = 900mhz c: f in = 1900mhz d: f in = 2400mhz
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 8 _______________________________________________________________________________________ typical operating characteristics (continued) (max2472/max2473 ev kit, v cc = +3v, t a = +25?, unless otherwise noted.) max2473 scattering parameters (in to out)
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers _______________________________________________________________________________________ 9 detailed description the max2472/max2473 are ideal replacements for dis- crete solutions where a vco output must drive more than one input, especially where high reverse isolation and low supply currents are mandatory. the max2472 features a two-stage wideband architecture with a high- input-impedance common-emitter amplifier followed by two separate open-collector output stages. the max2473 features a two-stage wideband architecture with a high-input-impedance common-emitter amplifier followed by one open-collector output stage, with the added feature of output power control. using values for r bias from 11k to 23k allows the output power of the max2473 to range from -2dbm to -10dbm. pin description table 1. output matching components 1.2nh murata lqg11ainzs00 2400 1pf murata grm39cog1r0b50v 2.2nh murata lqg11azn2500 1900 1pf murata grm39cog1r0b50v 1pf murata grm39cog1r0b50v 1.5pf murata grm39cog1r5b50v c match 12nh coilcraft 0603hs-12ntjbc 900 22nh coilcraft 0603hs-22ntjbc 600 l match operating frequency (mhz) function name pin max2472 max2473 open-collector buffer output 1. connect to v cc via a resistor or inductor/choke. ac-coupling to the output is required. 1 open-collector buffer output. connect to v cc via a resistor or inductor/choke. ac-coupling to the output is required. 2, 5 2, 5 rf ground. connect to the ground plane as close to the ic as possible to minimize trace inductance. 1 3 open-collector buffer output 2. connect to v cc via a resistor or inductor/choke. ac-coupling to the output is required. 3 bias resistor connection. connect a resistor from bias to gnd to set the output stage bias current and gain. to choose r bias , refer to the typical operating characteristics for the max2473. 6 6 supply voltage input: +2.7v < v cc < +5.5v 4 4 high-impedance input to the buffer amplifier out1 out gnd out2 bias v cc in
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 10 ______________________________________________________________________________________ applications information input considerations the max2472/max2473 offer high-impedance inputs ideal for low-distortion buffering of a vco. for applica- tions with discrete transistor-based oscillator designs, simply ac-couple the oscillator directly to the input; the buffer? high input impedance results in minimal load- ing on the oscillator. for use with 50 vco modules, determine the approximate input impedance (s11) of the max2472/max2473 from the s parameter tables in the typical operating characteristics . terminate the buffer input with a shunt resistor ? term ?such that r term || re[s 11 ] = 50 , and use a series blocking capacitor between the shunt resistor and the device input. this provides a very stable 50 termination and increases reverse isolation. for those applications needing both high gain and good input match, reac- tively match the buffer inputs to 50 with simple two- element matching circuits. figure 1 shows an equivalent input circuit of the max2472/max2473 in pin. output considerations the max2472/max2473 outputs are configured as open-collector output stages, allowing maximum flexi- bility. to achieve maximum gain and output drive, reac- tively match these outputs with a shunt inductor/choke to v cc followed by a series capacitor (dc block). for applications not requiring high gain and output drive (pll prescaler), use a simple resistor to v cc followed by a dc blocking capacitor. figure 2 shows an equiva- lent circuit of the max2472/max2473 out pin(s). figure 3 shows an equivalent circuit of the max2473 bias pin. output matching circuit table 1 lists recommended values for lumped-element output matching circuits at certain frequencies. for fre- quencies other than those specified, use the parame- ters given in the typical operating characteristics . layout and power-supply bypassing a properly designed pc board is essential to any rf/microwave circuit. be sure to use controlled imped- ance lines on all high-frequency inputs and outputs. bypass the power supply with decoupling capacitors v cc (pin 6) 250 w 1k 33 w 1.3pf gnd (pin 5) in (pin 4) figure 1. input structure v cc (pin 6) 2k out 10 w gnd (pin 2) figure 2. output structure v cc (pin 6) bias (pin 3) internal 1.2v reference gnd (pin 2) 1k figure 3. bias structure (max2473 only)
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers ______________________________________________________________________________________ 11 as close to the v cc pin as possible. for long v cc lines (inductive), it may be necessary to add additional decoupling capacitors located farther away from the device package. proper connection of the gnd pins is essential to achieving maximum reverse isolation. if the pc board uses a topside rf ground, connect both gnd pins directly to it. for a board where the ground plane is not on the component side, the best technique is to con- nect the gnd pins to the board with plated through- holes (vias) to the ground plane, located as close to the package as possible. typical operating circuits gnd gnd 0.01 m f 0.01 m f 30pf 0.01 m f 30pf 1.0 m f to mixer to mixer or pll out2 out1 l match l match c match c match 100pf vco in v cc v cc v cc v cc max2472 bias gnd gnd 0.01 m f 0.01 m f 30pf 1.0 m f bias l match c match 100pf vco in v cc v cc v cc max2473 bias to mixer r bias
max2472/max2473 500mhz to 2500mhz vco buffer amplifiers 12 ______________________________________________________________________________________ package information 6lsot.eps chip information transistor count: 109

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