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general description the MAX2645 is a versatile, high-linearity, low-noise amplifier designed for 3.4ghz to 3.8ghz wireless local loop (wll), wireless broadband access, and digital microwave radio applications. the device features an externally adjustable bias control, set with a single resis- tor, that allows the user to meet minimum linearity require- ments while minimizing current consumption. the amplifier? high-gain, low-noise performance and adjustable input third-order intercept (ip3) allow it to be used as a low-noise amplifier (lna) in the receive path, a pa predriver in the transmit path, or as an lo buffer. the MAX2645 features a logic-level gain control that pro- vides a 25db step reduction in gain, which improves ip3 performance for operation during high input signal level conditions. supply current is reduced from 9ma in high- gain mode to 3ma in low-gain mode. the device also includes a logic-controlled shutdown mode, which reduces supply current to 0.1?. the MAX2645 operates from a +3v to +5.5v supply and is offered in the miniature 10-pin ?ax package (5mm ? 3mm) with an exposed paddle. its performance has been optimized for use with the max2683/max2684 3.5ghz sige mixers to provide a complete high-performance, front-end solution for 3.5ghz applications. applications wireless local loop wireless broadband access digital microwave radios features 3.4ghz to 3.8ghz frequency range lna performance (high/low-gain modes) gain: +14.4db/-9.7db nf: 2.3db/15.5db input ip3: +4dbm/+13dbm supply current: 9.2ma/2.7ma highly versatile application receive path 1st and 2nd stage lna transmit pa predriver lo buffer adjustable ip3 and supply current 0.1? supply current in shutdown mode +3.0v to +5.5v single-supply operation 10-pin ?ax-ep package (5.0mm x 3.0mm) MAX2645 ________________________________________________________________ maxim integrated products 1 19-1759; rev 1; 8/03 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver ordering information pin configuration appears at end of data sheet. part temp range pin-package MAX2645eub -40 c to +85 c 10 max-ep* *ep = exposed paddle. application circuit lna, low nf 14.4/-9.7 2.3/15.5 +4/+13 +10/+15.5 +11.8/+16.2 2.6/16 2.6/16 14.9/-10.7 15.2/-9.7 lna, high ip3 pa predriver gain (db) nf (db) iip3 (dbm) MAX2645 bias and power management rfin z1 rf input 3.5ghz c1 high gain low gain gnd gain step shutdown logic inputs r bias radial stub v cc rf output t line typical operating circuit evaluation kit available for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver 2 _______________________________________________________________________________________ absolute maximum ratings 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 +6.0v gain, shdn , rfout to gnd .....................0.3v to (v cc + 0.3v) rfin input power (50 ? source)........................................16dbm minimum r bias ....................................................................10k ? continuous power dissipation (t a = +70 c) 10-pin max-ep (derate 10.3mw/ c above t a = +70 c) ....................825mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c dc electrical characteristics (v cc = +3.0v to +5.5v, gain = shdn = v cc , r bias = 20k ? , no rf signals applied, t a = -40 c to +85 c. typical values are at v cc = +3.3v, t a = +25 c, unless otherwise indicated.) (note 1) parameter conditions min typ max units supply voltage 3.0 5.5 v gain = v cc 9.2 10.9 r bias = 20k ? , t a = +25 c gain = gnd 2.7 3.9 gain = v cc 11.6 r bias = 20k ? , t a = -40 c to +85 c gain = gnd 4.0 gain = v cc 12 operating supply current r bias = 15k ? , t a = +25 c gain = gnd 3.6 ma shutdown supply current shdn = gnd 0.1 2 a input logic voltage high gain, shdn 2.0 v input logic voltage low gain, shdn shdn = v cc 1 input logic bias current gain = shdn = gnd -10 a caution! esd sensitive device
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver _______________________________________________________________________________________ 3 ac electrical characteristics?na (low-noise figure application circuit) (MAX2645 ev kit, v cc = gain = shdn = +3.3v,r bias = 20k ? 1%, p rfin = -20dbm, f rfin = 3550mhz, z o = 50 ? , t a = +25 c, unless otherwise noted.) parameter conditions min typ max units frequency range (note 2) 3400 3800 mhz gain = v cc 12.9 14.4 15.4 gain (note 3) gain = gnd -11.8 -9.7 -8.0 db gain variation over temperature t a = -40 c to +85 c, gain = v cc or gnd (note 4) 0.3 0.7 db gain step 24.1 db gain = v cc (note 5) +4 input third-order intercept gain = gnd (note 6) +13 dbm gain = v cc -5 input 1db compression point gain = gnd 0 dbm gain = v cc (notes 4, 7) 2.3 3.0 noise figure gain = gnd 15.5 db gain = v cc 25 reverse isolation gain = gnd 19 db gain step transition time (note 8) 1 s turn-on/turn-off time (note 9) 0.5 s ac electrical specifications lna (high-input ip3 application circuit) (MAX2645 ev kit, v cc = gain = shdn = +3.3v,r bias = 20k ? 1%, p rfin = -20dbm, f rfin = 3550mhz, z o = 50 ? , t a = +25 c, unless otherwise noted.) parameter conditions min typ max units frequency range (note 2) 3400 3800 mhz gain = v cc 14.9 gain gain = gnd -10.7 db gain variation over temperature t a = -40 c to +85 c, gain = v cc or gnd 0.3 db gain step 25.6 db gain = v cc (note 6) +10.0 input third-order intercept gain = gnd (note 7) +15.5 dbm gain = v cc -4 input 1db compression point gain = gnd 0 dbm gain = v cc 2.6 noise figure gain = gnd 16 db gain = v cc 25 reverse isolation gain = gnd 19 db
7 8 9 10 11 12 13 14 15 3.0 3.5 4.0 4.5 5.0 5.5 supply current vs. supply voltage (high-gain mode) MAX2645-01 supply voltage (v) supply current (ma) t a = +25? t a = +85? t a = -40? t a = +25? t a = +85? r bias = 20k ? t a = -40? r bias = 15k ? 2.0 3.0 2.5 4.0 3.5 4.5 5.0 3.0 4.0 3.5 4.5 5.0 5.5 supply current vs. supply voltage (low-gain mode) MAX2645-02 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = +25 c t a = +85 c t a = -40 c t a = -40 c r bias = 15k ? r bias = 20k ? 20 15 10 5 0 15 20 25 supply current vs. r bias MAX2645-03 r bias (k ? ) supply current (ma) high gain low gain v cc = 3.3v v cc = 5v v cc = 5v v cc = 3.3v typical operating characteristics (MAX2645 ev kit, v cc = +3.3v, r bias = 20k ? , f rfin = 3550mhz, t a = +25 c, unless otherwise noted.) MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver 4 _______________________________________________________________________________________ ac electrical specifications pa predriver application circuit (MAX2645 ev kit, v cc = gain = shdn = +3.3v,r bias = 20k ? 1%, p rfin = -20dbm, f rfin = 3550mhz, z o = 50 ? , t a = +25 c, unless otherwise noted.) parameter conditions min typ max units frequency range (note 2) 3400 3800 mhz gain = v cc 15.2 gain gain = gnd -9.7 db gain variation over temperature t a = -40 c to +85 c, gain = v cc or gnd 0.3 db gain step 24.9 db gain = v cc (note 6) +11.8 input third-order intercept gain = gnd (note 7) +16.2 dbm gain = v cc -1.8 input 1db compression point gain = gnd 0 dbm gain = v cc 2.6 noise figure gain = gnd 16 db gain = v cc 25 reverse isolation gain = gnd 19 db note 1: limits over temperature guaranteed by correlation to worst-case temperature testing. note 2: this is the recommended operating frequency range. operation outside this frequency range is possible but has not been characterized. the device is characterized and tested at 3550mhz. for optimum performance at a given frequency, the out- put matching network must be properly designed. see applications information section. note 3: specifications are corrected for board losses (0.25db at input, 0.25db at output). note 4: guaranteed by design and characterization. note 5: input ip3 measured with two tones, f 1 = 3550mhz and f 2 = 3551mhz, at -20dbm per tone. note 6: input ip3 measured with two tones, f 1 = 3550mhz and f 2 = 3551mhz, at -12dbm per tone. note 7: specifications are corrected for board losses (0.25db at input). note 8: time from when gain changes state to when output power reaches 1db of its final value. note 9: time from when shdn changes state to when output power reaches 1db of its final value.
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver _______________________________________________________________________________________ 5 7 10 9 8 11 12 13 14 15 16 17 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (high-gain mode) MAX2645-04 frequency (ghz) gain (db) t a = +25 c t a = +85 c t a = -40 c low-noise figure circuit -15 -12 -13 -14 -11 -10 -9 -8 -7 -6 -5 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (low-gain mode) MAX2645-05 frequency (ghz) gain (db) t a = +85 c t a = -40 c t a = +25 c low-noise figure circuit 13.0 13.6 13.4 13.2 13.8 14.0 14.2 14.4 14.6 14.8 15.0 3.0 3.5 4.5 5.0 5.5 gain vs. supply voltage (high-gain mode) MAX2645-06 supply voltage (v) gain (db) 4.0 t a = +25 c t a = +85 c t a = -40 c low-noise figure circuit -11.0 -10.5 -10.0 -9.5 -9.0 -8.5 -8.0 -7.5 -7.0 3.0 3.5 4.0 4.5 5.0 5.5 gain vs. supply voltage (low-gain mode) MAX2645-07 supply voltage (v) gain (db) t a = -40 c t a = +25 c t a = +85 c low-noise figure circuit 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 26.0 3.0 3.5 4.0 4.5 5.0 5.5 gain step vs. supply voltage MAX2645-08 supply voltage (v) gain step (db) t a = +25 c t a = +85 c t a = -40 c low-noise figure circuit 14.0 14.2 14.6 14.4 14.8 15.0 gain vs. r bias (high-gain mode) MAX2645-09 r bias (k ? ) gain (db) 15.0 20.0 17.5 22.5 25.0 v cc = 5v v cc = 3.3v low-noise figure circuit -12.0 -11.4 -11.6 -11.8 -11.2 -11.0 -10.8 -10.6 -10.4 -10.2 -10.0 15.0 17.5 20.0 22.5 25.0 gain vs. r bias (low-gain mode) MAX2645-10 r bias (k ? ) gain (db) v cc = 3.3v v cc = 5v low-noise figure circuit 0 1 3 2 4 5 noise figure vs. frequency (high-gain mode) MAX2645-11 frequency (ghz) noise figure (db) 3.4 3.6 3.5 3.7 3.8 low-noise figure circuit 10 13 12 11 14 15 16 17 18 19 20 3.4 3.5 3.6 3.7 3.8 noise figure vs. frequency (low-gain mode) MAX2645-12 frequency (ghz) noise figure (db) low-noise figure circuit typical operating characteristics (continued) (MAX2645 ev kit, v cc = +3.3v, r bias = 20k ? , f rfin = 3550mhz, t a = +25 c, unless otherwise noted.)
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver 6 _______________________________________________________________________________________ typical operating characteristics (continued) (MAX2645 ev kit, v cc = +3.3v, r bias = 20k ? , f rfin = 3550mhz, t a = +25 c, unless otherwise noted.) 0 1 3 2 4 5 noise figure vs. r bias (high-gain mode) MAX2645-13 r bias (k ? ) noise figure (db) 15.0 20.0 17.5 22.5 25.0 low-noise figure circuit 1.0 2.5 2.0 1.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 3.0 3.5 4.5 5.0 5.5 input ip3 vs. supply voltage (high-gain mode) MAX2645-14 supply voltage (v) input ip3 (dbm) 4.0 t a = -40 c t a = +85 c t a = +25 c low-noise figure circuit 10.5 12.0 11.5 11.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 3.0 3.5 4.5 5.0 5.5 input ip3 vs. supply voltage (low-gain mode) MAX2645-15 supply voltage (v) input ip3 (dbm) 4.0 t a = +85 c t a = +25 c t a = -40 c low-noise figure circuit -1 1 5 3 7 9 input ip3 vs. r bias (high-gain mode) MAX2645-16 r bias (k ? ) input ip3 (dbm) 15.0 20.0 17.5 22.5 25.0 v cc = 5v v cc = 3.3v low-noise figure circuit 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 15.0 17.5 20.0 22.5 25.0 input ip3 vs. r bias (low-gain mode) MAX2645-17 r bias (k ? ) input ip3 (dbm) v cc = 5v v cc = 3.3v low-noise figure circuit -8.5 -7.0 -7.5 -8.0 -6.5 -6.0 -5.5 -5.0 -4.5 -4.0 -3.5 3.0 3.5 4.5 5.0 5.5 input p1db vs. supply voltage (high-gain mode) MAX2645-18 supply voltage (v) input p1db (dbm) 4.0 t a = -40 c t a = +25 c t a = +85 c low-noise figure circuit -25 -15 -20 -5 -10 5 0 10 -10.0 -5.0 0 5.0 output power vs. input power (low-gain mode) MAX2645-19 input power (dbm) output power (dbm) t a = +25 c t a = +85 c t a = -40 c low-noise figure circuit -6 -7 -4 -5 -3 -2 input p1db vs. r bias (high-gain mode) MAX2645-20 r bias (k ? ) input p1db (dbm) 15.0 20.0 17.5 22.5 25.0 v cc = 5v v cc = 3.3v low-noise figure circuit 1.00 1.50 1.25 2.00 1.75 2.25 2.50 3.4 3.6 3.5 3.7 3.8 input vswr vs. frequency MAX2645-21 frequency (ghz) vswr high gain low gain low-noise figure circuit
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver _______________________________________________________________________________________ 7 1.0 2.5 2.0 1.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 3.4 3.5 3.6 3.7 3.8 output vswr vs. frequency MAX2645-22 frequency (ghz) vswr low gain high gain low-noise figure circuit -35 -25 -30 -15 -20 -5 -10 0 reverse isolation vs. frequency MAX2645-23 frequency (ghz) reverse isolation (db) 3.4 3.5 3.6 3.7 3.8 low gain high gain low-noise figure circuit 12.0 13.5 13.0 12.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (high-gain mode) MAX2645-24 frequency (ghz) gain (db) high-input ip3 circuit t a = +25 c t a = +85 c t a = -40 c -15.0 -13.5 -14.0 -14.5 -13.0 -12.5 -12.0 -11.5 -11.0 -10.5 -10.0 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (low-gain mode) MAX2645-25 frequency (ghz) gain (db) t a = +25 c t a = +85 c t a = -40 c high-input ip3 circuit 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.4 3.5 3.6 3.7 3.8 input vswr vs. frequency MAX2645-26 frequency (ghz) vswr low gain high gain high-input ip3 circuit 10 13 12 11 14 15 16 17 18 19 20 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (high-gain mode) MAX2645-27 frequency (ghz) gain (db) pa predriver circuit t a = +25 c t a = +85 c t a = -40 c v cc = 5v -15 -12 -13 -14 -11 -10 -9 -8 -7 -6 -5 3.4 3.5 3.6 3.7 3.8 gain vs. frequency (low-gain mode) MAX2645-28 frequency (ghz) gain (db) t a = +25 c t a = +85 c t a = -40 c pa predriver circuit v cc = 5v 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 3.0 3.5 4.0 4.5 5.0 5.5 gain vs. supply voltage (high-gain mode) MAX2645-29 supply voltage (v) gain (db) t a = +85 c t a = -40 c t a = +25 c pa predriver circuit v cc = 5v -12.5 -12.0 -11.5 -11.0 -10.5 -10.0 -9.5 -9.0 -8.5 3.0 3.5 4.0 4.5 5.0 5.5 gain vs. supply voltage (low-gain mode) MAX2645-30 supply voltage (v) gain (db) t a = +25 c t a = +85 c t a = -40 c pa predriver circuit v cc = 5v typical operating characteristics (continued) (MAX2645 ev kit, v cc = +3.3v, r bias = 20k ? , f rfin = 3550mhz, t a = +25 c, unless otherwise noted.)
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver 8 _______________________________________________________________________________________ typical operating characteristics (continued) (MAX2645 ev kit, v cc = +3.3v, r bias = 20k ? , f rfin = 3550mhz, t a = +25 c, unless otherwise noted.) 7 9 8 11 10 12 13 3.0 4.0 3.5 4.5 5.0 5.5 output p1db point vs. supply voltage (high-gain mode) MAX2645-31 supply voltage (v) t a = +25 c t a = +85 c t a = -40 c pa predriver circuit v cc = 5v -25 -15 -20 -5 -10 5 0 10 -10.0 -5.0 0 5.0 output power vs. input power (low-gain mode) MAX2645-32 input power (dbm) output power (dbm) t a = +25 c t a = +85 c t a = -40 c pa predriver circuit v cc = 5v 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.4 3.5 3.6 3.7 3.8 input vswr vs. frequency MAX2645-33 frequency (ghz) vswr high gain low gain pa predriver circuit v cc = 5v pin description pin name function 1, 2, 4, 7, ep gnd ground. connect to ground plane with a low-inductance connection. solder exposed paddle evenly to the board ground plane. 3 rfin rf input port to amplifier. requires a matching network and a dc-blocking capacitor that may be part of this network. see figure 1 for recommended component values. 5 bias bias-setting resistor connection. a resistor, r bias , placed from bias to ground sets the linearity and supply current of the amplifier. 6 rfout rf open-collector output port of amplifier. requires a matching network composed of an inductance to v cc and a dc-blocking capacitor. see figure 1 for recommended component values. 8 shdn shutdown control logic-level input. a logic high enables the device for normal operation. a logic low places the device in low-power shutdown mode. 9 gain gain control logic-level input. a logic high places the device in high-gain mode. a logic low places the device in low-gain mode, reducing the gain by 25db. 10 v cc power supply input. bypass directly to ground with a capacitor as close to the supply pin as possible. see figure 1 for recommended component values.
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver _______________________________________________________________________________________ 9 detailed description the MAX2645 is a versatile amplifier with high-gain, high-linearity, and low-noise performance features that make it suitable for use as an lna, high-linearity/low- noise amplifier, pa predriver, or lo buffer in the 3.4ghz to 3.8ghz frequency range. see figure 1, MAX2645 typical application circuit , for recommended compo- nent values. a single external bias-setting resistor allows the system designer to trade off linearity for reduced supply current. a logic-level control reduces gain by a 25db step to further improve input ip3 performance. a low-power shutdown mode disables the device and reduces current consumption to 0.1a. bias circuitry the linearity and supply current of the MAX2645 are externally programmable with a single resistor (r bias ) placed from bias to gnd. larger resistor values result in lower ip3 performance and lower supply current, while smaller resistor values result in higher ip3 performance and higher supply current. use resistor values in the 15k ? to 25k ? range, with a nominal value of 20k ? suitable for most applications. see typical operating characteristic s for performance variation vs. r bias value. gain step control the MAX2645 features a logic-level gain step control input (gain) that places the device in high-gain or low- gain mode. a logic-level high places the device in high- gain mode, where the gain is 14.5db. a logic-level low places the device in low-gain/high-linearity mode, where the gain is reduced to 10db and the input ip3 perfor- mance is increased. shutdown control the MAX2645 features a logic-level shutdown control input. a logic high on shdn enables the device for nor- mal operation. a logic low on shdn disables all device functions and reduces supply current to 0.1a. applications information rf input the rfin port is internally biased and requires an exter- nal dc-blocking capacitor. a matching network is required for best performance. figure 1 shows compo- nent values optimized for best noise-figure performance, low-noise figure, high-input ip3 performance, and high- output p1db performance in the 3.4ghz to 3.8ghz fre- quency range. for matching to other frequencies, see tables 1 and 2. table 1. MAX2645 s-parameters s11 s21 s12 s22 freq (mh z ) mag phase mag phase mag phase mag phase r bias = 20 k ? , v cc = +3.3v, t a = +25 c 3400 0.468 -149.8 5.061 -44.6 0.053 -55.5 0.660 -57.0 3450 0.466 -150.4 4.975 -46.3 0.058 -60.8 0.658 -58.4 3500 0.472 -151.6 5.098 -49.9 0.056 -64.6 0.661 -60.6 3550 0.469 -153.4 4.883 -53.7 0.054 -62.7 0.658 -63.0 3600 0.471 -154.6 4.814 -53.7 0.056 -64.4 0.647 -64.2 3650 0.477 -155.0 5.118 -57.4 0.058 -68.9 0.657 -66.2 3700 0.485 -156.6 4.769 -63.4 0.054 -70.5 0.657 -69.8 3750 0.484 -156.5 4.780 -62.3 0.058 -72.0 0.654 -70.9 3800 0.492 -157.0 4.939 -66.6 0.060 -75.4 0.654 -72.3 r bias = 15 k ? , v cc = +5v, t a = +25 c 3400 0.454 -146.6 5.350 -41.8 0.057 -51.3 0.651 -52.3 3450 0.457 -147.4 5.245 -43.5 0.061 -56.7 0.646 -53.7 3500 0.465 -147.9 5.375 -46.6 0.060 -61.2 0.654 -55.6 3550 0.468 -149.7 5.165 -50.3 0.057 -61.0 0.652 -58.3 3600 0.472 -150.5 5.066 -50.2 0.060 -62.7 0.645 -59.3 3650 0.481 -150.5 5.386 -53.4 0.063 -67.6 0.652 -60.7 3700 0.486 -152.2 5.040 -59.4 0.060 -67.8 0.648 -63.9 3750 0.486 -152.4 5.019 -58.3 0.062 -67.0 0.642 -64.8 3800 0.499 -152.6 5.207 -62.0 0.065 -73.3 0.643 -66.2
rf output the rfout port is an open-collector output that must be tied to v cc through an inductance for proper biasing. the MAX2645 ev kit uses a length of transmission line equivalent to 1.5nh of inductance. a dc-blocking capacitor is required and can be part of the output matching network. see figure 1 for component values recommended for operation over the 3.4ghz to 3.8ghz frequency range. see table 1 for matching to other fre- quencies. this transmission line is terminated at the v cc node with a radial stub for high-frequency bypass- ing. this arrangement provides a high-q, low-loss bias network used to optimize performance. the radial stub can be replaced with an appropriate microwave capacitor. power-supply, bias circuitry, and logic- input bypassing proper power-supply bypassing is essential for high-fre- quency circuit stability. bypass v cc with 10f, 0.1f, and 50pf capacitors located as close to the v cc pin as possible. to minimize the amount of noise injected into the bias circuitry and logic inputs, bypass the pins with capaci- tors located as near to the device pin as possible. for additional isolation on the logic-control pins, place resis- tors between the logic-control inputs and the bypass capacitors. see figure 1 for recommended component values; refer to MAX2645 ev kit manual for recommend- ed board layout. layout considerations a properly designed pc board is an essential part of any rf/microwave circuit. keep rf signal lines as short as possible to reduce losses, radiation, and inductance. use separate, low-inductance vias to the ground plane for each ground pin. for best performance, solder the exposed paddle on the bottom of the device package evenly to the board ground plane. MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver 10 ______________________________________________________________________________________ table 2. MAX2645 noise parameters frequency (mhz) f min (db) | opt | opt angle r n ( ? ) r bias = 20 k ? , v cc = +3.3v, t a = +25 c 3400 2.098 0.237 144.1 31.1 3450 2.122 0.235 146.1 31.5 3500 2.148 0.235 148.2 32.0 3550 2.173 0.234 150.3 32.5 3600 2.198 0.233 152.4 32.9 3650 2.225 0.232 154.5 33.5 3700 2.251 0.231 156.5 33.9 3750 2.279 0.230 158.6 34.5 3800 2.306 0.229 160.7 35.0 r bias = 15 k ? , v cc = +5v, t a = +25 c 3400 2.103 0.210 146.3 31.1 3450 2.127 0.209 148.4 31.6 3500 2.152 0.208 150.5 32.1 3550 2.177 0.207 152.6 32.5 3600 2.203 0.206 154.7 33.0 3650 2.229 0.206 156.8 33.5 3700 2.256 0.205 158.9 34.0 3750 2.282 0.204 161.0 34.6 3800 2.310 0.204 163.1 35.1
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver ______________________________________________________________________________________ 11 application circuit lna, low nf lna, high input ip3 pa predriver c1 1000pf 0.01 f 1.5pf z1 1.8nh 0.75pf 0.75pf r bias (k ? ) 20 20 15 v cc (v) 3.3 3.3 5.0 v cc v cc gain rfin bias gnd rf out rf output gnd gnd gnd MAX2645 shdn v cc 40 294mils 0.1 f 0.75pf 1000pf t line l equiv = 1.5nh radial stub * * board material = getek, copper thickness = 1 oz board thickness = 0.012in, dielectric constant = 3.8 8 8 7 9 47pf rf input 3.4ghz to 3.8ghz 1 2 3 4 5 c1 z1 r bias 220pf high gain low gain on off figure 1. typical application circuit figure 2. typical system application block diagram MAX2645 MAX2645 max2683 max2684 MAX2645 MAX2645 max2683 max2684 MAX2645 lo buffer lo buffer transmit if input receive if output lo lo if bandpass filter rf image-reject filter high ip3 lna low nf lna duplexer pa pa predriver rf bandpass filter
MAX2645 3.4ghz to 3.8ghz sige low-noise amplifier/pa predriver maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. 1 2 3 4 5 10 9 8 7 6 v cc gain shdn gndgnd rfin gnd gnd MAX2645 max-ep top view rfoutbias pin configuration chip information transistor count: 271 10lumax.eps package outline, 10l umax/usop 1 1 21-0061 i rev. document control no. approval proprietary information title: top view front view 1 0.498 ref 0.0196 ref s 6 side view bottom view 0 0 6 0.037 ref 0.0078 max 0.006 0.043 0.118 0.120 0.199 0.0275 0.118 0.0106 0.120 0.0197 bsc inches 1 10 l1 0.0035 0.007 e c b 0.187 0.0157 0.114 h l e2 dim 0.116 0.114 0.116 0.002 d2 e1 a1 d1 min -a 0.940 ref 0.500 bsc 0.090 0.177 4.75 2.89 0.40 0.200 0.270 5.05 0.70 3.00 millimeters 0.05 2.89 2.95 2.95 - min 3.00 3.05 0.15 3.05 max 1.10 10 0.60.1 0.60.1 ?0.500.1 h 4x s e d2 d1 b a2 a e2 e1 l l1 c gage plane a2 0.030 0.037 0.75 0.95 a1 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)

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