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general description the max2027 high-performance, digitally controlled variable-gain amplifier is designed for use from 50mhz to 400mhz. the device integrates a digitally controlled attenuator and a high-linearity if amplifier in one package. targeted for if signal chains to adjust gain either dynamically or as a one-time channel gain setting, the max2027 is ideal for applications requiring high perfor- mance. the attenuator provides 23db of attenuation range with ?.05db state-to-state accuracy. the max2027 is available in a thermally enhanced 20- pin tssop-ep package and operates over the -40? to +85? temperature range. applications cellular base stations receiver gain control transmitter gain control broadband systems automatic test equipment terrestrial links features ? 50mhz to 400mhz frequency range ? variable gain: -8db to +15db ? output ip3: 35dbm (at all gain settings) ? noise figure: 4.7db at maximum gain ? digitally controlled gain with 1db resolution and 0.05db state-to-state accuracy max2027 if digitally controlled variable-gain amplifier ________________________________________________________________ maxim integrated products 1 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 12 11 9 10 max2027 attenuation logic control amp bias gnd gnd attn out gnd gnd rf_in v cc v cc gnd amp in i bias i set b2 b3 b4 gnd rf_out v cc b0 b1 pin configuration/ functional diagram ordering information 19-2601; rev 1; 2/04 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. part temp range pin-package max2027eup-t -40? to +85? 20 tssop-ep* * ep = exposed pad.
max2027 if digitally controlled variable-gain amplifier 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. all pins input voltage (except amp in , i bias , and i set ) to gnd................................................................-0.3v to +5.5v input voltage levels (b0?4).....................-0.3v to (v cc + 0.5v) input voltage levels (amp in and i bias ) ................-0.3v to +1.5v input voltage levels (i set ) ....................................-0.3v to +1.0v rf input signal .................................................................20dbm rf output signal...............................................................22dbm continuous power dissipation (t a = +70?) 20-pin tssop-ep (derate 21.7mw/? above +70?) ..................................1.7w operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +165? lead temperature (soldering, 10s) .................................+300? dc electrical characteristics (typical application circuit, v cc = +4.75v to +5.25v, gnd = 0v. no rf signals applied, and rf input and output ports are terminated with 50 ? . r 1 = 825 ? , t a = -40? to +85?. typical values are at v cc = +5v and t a = +25?, unless otherwise noted.) (notes 1, 2) parameter symbol conditions min typ max units supply supply voltage v cc 4.75 5.00 5.25 v supply current i cc 60 75 ma i set current i set 0.9 ma control inputs/outputs control bits parallel 5 bits input logic high (note 3) 2 v input logic low 0.6 v input leakage current -1.2 +1.2 ?
max2027 if digitally controlled variable-gain amplifier _______________________________________________________________________________________ 3 ac electrical characteristics (typical application circuit without matching, v cc = +4.75v to +5.25v, gnd = 0v, max gain (b0 = b1 = b2 = b3 = b4 = 0), r 1 = 825 ? , p out = 5dbm, f in = 50mhz, 50 ? rf system impedance. typical values are at v cc = +5v and t a = +25?, unless otherwise noted.) (notes 1, 2) parameter symbol conditions min typ max units frequency range f r 50 400 mhz gain g no attenuation 15.5 db noise figure nf max gain 4.7 db minimum reverse isolation max gain 22 db output 1db compression point p 1db max gain 20.6 dbm 2nd-order output intercept point oip2 f 1 + f 2 , f 1 = 50mhz, f 2 = 51mhz, 5dbm/tone 42 dbm 3rd-order output intercept point oip3 all gain conditions, 5dbm/tone 34.7 dbm 2nd harmonic 2f in -44 dbc 3rd harmonic 3f in -68 dbc rf gain-control range 23 db gain-control resolution 1db attenuation absolute accuracy compared to the ideal expected attenuation 0.15/ -0.05 db attenuation relative accuracy between adjacent states ?.05 db gain drift over temperature t a = -40? to +85? ?.1 db peak-to-peak for all settings, f center = 75mhz 0.1 gain flatness over 50mhz bw peak-to-peak for all settings, f center = 200mhz 0.2 db attenuator switching time 50% control to 90% rf 40 ns input return loss f r = 50mhz to 250mhz, all gain conditions 15 db output return loss f r = 50mhz to 250mhz, all gain conditions 15 db note 1: guaranteed by design and characterization. note 2: all limits reflect losses of external components. output measurements are taken at rf out using the typical application circuit.
max2027 if digitally controlled variable-gain amplifier 4 _______________________________________________________________________________________ t ypical operating characteristics ( typical application circuit, v cc = 5.0v, max gain (b0 = b1 = b2 = b3 = b4 = 0), p out = 5dbm, r 1 = 825 ? , t a = +25?, unless otherwise noted.) supply current vs. temperature max2027 toc01 temperature ( c) supply current (ma) 80 65 -25 -10 5 35 20 50 54 56 58 60 62 64 66 68 52 -40 v cc = 5.25v v cc = 5.0v v cc = 4.75v input return loss vs. rf frequency (all states) max2027 toc02 frequency (mhz) input return loss (db) 350 300 250 200 150 100 30 25 20 15 10 5 0 35 50 400 output return loss vs. rf frequency (all states) max2027 toc03 frequency (mhz) output return loss (db) 350 300 250 200 150 100 30 25 20 15 10 5 0 35 50 400 gain vs. rf frequency (all states) max2027 toc04 frequency (mhz) gain (db) 350 300 250 200 150 100 -10 -5 0 5 10 15 20 -15 50 400 reverse isolation vs. frequency max2027 toc05 frequency (mhz) reverse isolation (db) 350 300 250 200 150 100 10 15 20 25 30 35 5 50 400 gain vs. frequency max2027 toc06 frequency (mhz) gain (db) 350 300 100 150 200 250 11 12 13 14 15 16 17 18 10 50 400 t a = -40 c t a = +25 c t a = +85 c gain vs. frequency max2027 toc07 frequency (mhz) gain (db) 350 300 100 150 200 250 11 12 13 14 15 16 17 18 10 50 400 v cc = 4.75v, 5.0v, and 5.25v
max2027 if digitally controlled variable-gain amplifier _______________________________________________________________________________________ 5 attenuation absolute accuracy (all states) max2027 toc08 frequency (mhz) absolute accuracy (db) 350 300 200 250 150 100 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 50 400 attenuation relative accuracy (all states) max2027 toc09 frequency (mhz) relative accuracy (db) 350 300 200 250 150 100 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 50 400 noise figure vs. frequency max2027 toc10 frequency (mhz) noise figure (db) 350 300 200 250 150 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 2.0 50 400 t a = +25 c t a = +85 c t a = -40 c output p-1db vs. frequency max2027 toc11 frequency (mhz) output p-1db (dbm) 350 300 250 200 150 100 18 19 20 21 22 23 17 50 400 t a = +85 c t a = -40 c t a = +25 c output p-1db vs. frequency max2027 toc12 frequency (mhz) output p-1db (dbm) 350 300 250 200 150 100 18 19 20 21 22 23 17 50 400 v cc = +5.25v v cc = +4.75v v cc = +5v output ip3 vs. frequency max2027 toc13 frequency (mhz) oip3 (dbm) 350 300 250 200 150 100 32 34 36 38 40 30 50 400 t a = -40 c t a = +85 c t a = +25 c p rf1 = p rf2 = 5dbm at output, ? f = 1mhz output ip3 vs. frequency max2027 toc14 frequency (mhz) oip3 (dbm) 350 300 250 200 150 100 32 34 36 38 40 30 50 400 v cc = +5.25v v cc = +5v v cc = +4.75v p rf1 = p rf2 = 5dbm at output, ? f = 1mhz t ypical operating characteristics (continued) ( typical application circuit, v cc = 5.0v, max gain (b0 = b1 = b2 = b3 = b4 = 0), p out = 5dbm, r 1 = 825 ? , t a = +25?, unless otherwise noted.)
max2027 if digitally controlled variable-gain amplifier 6 _______________________________________________________________________________________ input ip3 vs. attenuation state max2027 toc15 attenuation state iip3 (dbm) 20 16 12 8 4 20 30 25 35 40 45 15 024 f in = 400mhz f in = 200mhz f in = 50mhz p rf1 = p rf2 = 5dbm at output, ? f = 1mhz 2nd harmonic vs. frequency max2027 toc16 frequency (mhz) harmonic (dbc) 350 300 250 200 150 100 -55 -50 -45 -40 -35 -30 -60 50 400 t a = +85 c t a = -40 c t a = +25 c 2nd harmonic vs. frequency max2027 toc17 frequency (mhz) harmonic (dbc) 350 300 250 200 150 100 -55 -50 -45 -40 -35 -30 -60 50 400 v cc = +5v v cc = +5.25v v cc = +4.75v o1p2 vs. frequency (f1 + f2) max2027 toc18 frequency (mhz) o1p2 (dbm) 350 300 250 200 150 100 39 41 43 45 49 47 51 37 50 400 t a = +25 c t a = +85 c t a = -40 c p rf1 = p rf2 = 5dbm at output, ? f = 1mhz o1p2 vs. frequency (f1 + f2) max2027 toc19 frequency (mhz) o1p2 (dbm) 350 300 250 200 150 100 39 41 43 45 49 47 51 37 50 400 v cc = +4.75v v cc = +5.0v v cc = +5.25v p rf1 = p rf2 = 5dbm at output, ? f = 1mhz 3rd harmonic vs. frequency max2027 toc20 frequency (mhz) harmonic (dbc) 350 300 250 200 150 100 -80 -75 -70 -65 -60 -55 -85 50 400 t a = +25 c t a = +85 c t a = -40 c 3rd harmonic vs. frequency max2027 toc21 frequency (mhz) harmonic (dbc) 350 300 250 200 150 100 -80 -75 -70 -65 -60 -55 -85 50 400 v cc = +4.75v v cc = +5.25v v cc = +5v t ypical operating characteristics (continued) ( typical application circuit, v cc = 5.0v, max gain (b0 = b1 = b2 = b3 = b4 = 0), p out = 5dbm, r 1 = 825 ? , t a = +25?, unless otherwise noted.)
max2027 if digitally controlled variable-gain amplifier _______________________________________________________________________________________ 7 detailed description the max2027 is a high-performance, digitally con- trolled variable-gain amplifier for use in applications from 50mhz to 400mhz. the max2027 incorporates a digital attenuator with a 23db selectable attenuation range followed by a fixed- gain, high-linearity amplifier. the attenuator is digitally controlled through five logic lines: b0?4. this on-chip attenuator provides up to 23db of attenuation with ?.05db state-to-state accuracy. the fixed-gain amplifi- er utilizes negative feedback to achieve high stability, gain, linearity, and wide bandwidth. applications information input and output matching the max2027 incorporates on-chip input and output matching for operation below 250mhz. use a dc-block- ing capacitor value of 1000pf for pins 3, 12, and 18 (see figure 1). for operation above 250mhz, external match- ing improves performance. table 1 and table 2 provide recommended components for device operation. digitally controlled attenuator the digital attenuator is controlled through five logic lines: b0, b1, b2, b3, and b4. table 3 lists the attenua- tion settings. the input and output of this attenuator require external dc-blocking capacitors. this attenua- tor insertion loss is 2db when the attenuator is set to 0db (b0 = b1 = b2 = b3 = b4 = 0). pin description pin name function 1, 2, 11 v cc power supply. bypass to gnd with capacitors as close to the pin as possible as shown in the typical application circuit (figure 1). 3 rf_in signal input. see the typical application circuit for recommended component values. requires an external dc-blocking capacitor. 4, 5, 16, 17, 19, 20, ep gnd ground. use low-inductance layout techniques on pc board. solder the exposed pad evenly to the board ground plane. 6?0 b4?0 gain-control bits. see table 3 for gain setting. 12 rf_out signal output. requires an external pullup choke inductor (52ma typical current) to v cc along with a dc-blocking capacitor (figure 1). 13 i set connect an 825 ? resistor from i set to gnd. 14 i bias amplifier bias. connect to amp in (pin 15) through a choke inductor (0.3ma typ). 15 amp in amplifier input. requires a dc-coupling capacitor to allow biasing. 18 attn out attenuator output. requires an external dc-blocking capacitor. component value size c1, c3, c4 1000pf 0603 c2, c5 100pf 0603 c6, c7 0.1? 0603 c10 0.047? 0603 r1 825 ? ?% 0603 r2?6 47k ? 0603 l1 330nh 0805 l2 680nh 1008 table 1. suggested components of typical application circuit frequency component value size l3, l4 11nh 0603 300mhz c8, c9 6.8pf 0603 l3, l4 8.7nh 0603 400mhz c8, c9 5pf 0603 table 2. suggested matching components
max2027 if digitally controlled variable-gain amplifier 8 _______________________________________________________________________________________ fixed-gain amplifier the max2027 integrates a fixed-gain amplifier in a neg- ative feedback topology. this fixed-gain amplifier is optimized for a frequency range of operation from 50mhz to 400mhz with a high-output third-order inter- cept point (oip3). the bias current is chosen to opti- mize the ip 3 of the amplifier. when r 1 is 825 ? , the current consumption is 60ma while exhibiting a typical 35dbm output ip 3 . choke inductor the fixed-gain amplifier output port requires an external pullup choke inductor to v cc . at the input, connect a bias inductor of 330nh from amp in (pin 15) to i bias (pin 14). at the output, connect a 680nh choke inductor from rf_out (pin 12) to v cc (pin 11) to provide bias current to the amplifier. 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 induc- tance. for the best performance, route the ground pin traces directly to the exposed pad under the package. the pc board exposed pad must be connected to the ground plane of the pc board. it is suggested that multi- ple vias be used to connect this pad to the lower level ground planes. this method provides a good rf/thermal conduction path for the device. solder the exposed pad on the bottom of the device package to the pc board. the max2027 evaluation kit can be used as a refer- ence for board layout. gerber files are available upon request at www.maxim-ic.com. power-supply bypassing proper voltage-supply bypassing is essential for high- frequency circuit stability. bypass each v cc pin with a 0.1? and 100pf capacitor. connect the 100pf capacitor as close to v cc pins as possible. exposed pad rf/thermal considerations the exposed paddle (ep) of the max2027? 20-pin tssop-ep package provides a low thermal-resistance path to the die. it is important that the pc board on 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 rf in v cc c 2 r 2 r 3 b2 b3 b4 12 11 9 10 rf out v cc b0 b1 max2027 attenuation logic control amp bias v cc c 8 * l 3 * c 7 c 6 c 5 l 2 l 1 c 1 r 4 r 5 r 6 control inputs l 4 * attn out amp in *optional components: use to improve higher frequency matching i bias i set c 3 c 9 * c 10 c 4 r 1 exposed paddle figure 1. typical application circuit
max2027 if digitally controlled variable-gain amplifier _______________________________________________________________________________________ 9 which the max2027 is mounted be designed to con- duct heat from the ep. in addition, provide the ep with a low-inductance path to electrical ground. the ep must be soldered to a ground plane on the pc board, either directly or through an array of plated via holes. attenuation (db) b4 (16db) b3* (8db) b2 (4db) b1 (2db) b0 (1db) 0 00000 1 00001 2 00010 3 00011 4 00100 5 00101 6 00110 7 00111 8 01000 9 01001 10 01010 11 01011 12 01100 13 01101 14 01110 15 01111 16 1 x 000 17 1 x 001 18 1 x 010 19 1 x 011 20 1 x 100 21 1 x 101 22 1 x 110 23 1 x 111 table 3. attenuation setting vs. gain- control bits * enabling b4 disables b3, and the minimum attenuation is 16db. chip information transistor count: 325
max2027 if digitally controlled variable-gain amplifier maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. tssop 4.4mm body.eps d 1 1 21-0108 package outline, tssop, 4.40 mm body exposed pad 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 .)
e nglish ? ???? ? ??? ? ??? what's ne w p roducts solutions de sign ap p note s sup p ort buy comp any me mbe rs max2027 part number table notes: see the max2027 quickview data sheet for further information on this product family or download the max2027 full data sheet (pdf, 1.4mb). 1. other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales . 2. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 3. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free; # = rohs/lead-exempt. more: see full data sheet or part naming c onventions . 4. * some packages have variations, listed on the drawing. "pkgc ode/variation" tells which variation the product uses. 5. part number free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis max2027eup+d tssop;20 pin;4.4mm dwg: 21-0108e (pdf) use pkgcode/variation: u20e+1 * -40c to +85c rohs/lead-free: yes materials analysis max2027eup+td tssop;20 pin;4.4mm dwg: 21-0108e (pdf) use pkgcode/variation: u20e+1 * -40c to +85c rohs/lead-free: yes materials analysis max2027eup-d tssop;20 pin;4.4mm dwg: 21-0108e (pdf) use pkgcode/variation: u20e-1 * -40c to +85c rohs/lead-free: no materials analysis max2027eup-td tssop;20 pin;4.4mm dwg: 21-0108e (pdf) use pkgcode/variation: u20e-1 * -40c to +85c rohs/lead-free: no materials analysis didn't find what you need? c ontac t us: send us an email c opyright 2 0 0 7 by m axim i ntegrated p roduc ts , dallas semic onduc tor ? legal n otic es ? p rivac y p olic y

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