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general description the max3503 programmable power amplifier is designed for use in catv upstream applications. the max3503 drives 61dbmv (qpsk) into a 75 ? load when driven with a 34dbmv nominal input signal. both input and output ports are differential, requiring that an exter- nal balun be used at the output port. the variable gain feature provides greater than 56db of dynamic range, which is controlled by an spi 3-wire interface. gain control is available in 0.5db steps. the device operates over a frequency range of 5mhz to 65mhz. the max3503 is internally matched for use with a 1:1 balun. this device operates from a single 3.3v dc supply and draws 235ma during transmit (100% duty cycle, 61dbmv out). the bias current is automatically adjusted, based on the output level to increase efficien- cy. additionally, the device can be disabled between bursts to minimize noise and save power while main- taining a match at the output port. a shutdown mode is available to disable all circuitry and reduce current con- sumption to 5? (typ). the max3503 is available in a 20-pin qfn package. the device operates in the extended industrial temper- ature range (-40? to +85?). ________________________applications docsis ? /eurodocsis ? and dvb cable modems opencable ? set-top box telephony over cable catv status monitor features single 3.3v supply operation accurate gain control, 1db over 53db range gain programmable in 0.5db steps -55dbc harmonic distortion at 65mhz low burst on/off transient high efficiency: 182mw at 34dbmv out; 16mw in transmit-disable mode max3503 upstream catv amplifier ________________________________________________________________ maxim integrated products 1 20 19 18 17 16 n.c. n.c. n.c. n.c. cext 6 7 8 9 10 sda sclk cs txen shdn 11 12 13 14 15 gnd ** note: corner gnd pins and the exposed pad must be soldered to the supply ground . gnd gnd gnd n.c. out- n.c. out+ v cc 5 4 3 2 1 gnd in- gnd v cc in+ max3503 qfn** top view pin configuration 19-2339; rev 1; 3/02 evaluation kit available ordering information spi is a trademark of motorola, inc. docsis/eurodocsis/opencable are trademarks of cablelabs . part temp range pin-package max3503egp -40 c to +85 c 20 qfn-ep* (5mm 5mm) typical operating circuit appears at end of data sheet. * exposed pad. 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.
max3503 upstream catv amplifier 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (max3503 ev kit, v cc = 3.1v to 3.6v, v gnd = 0, txen = shdn = high, t a = -40 c to +85 c. typical parameters are at v cc = 3.3v, t a = +25 c, unless otherwise specified.) (note1) ac electrical characteristics (max3503 ev kit, v cc = 3.1v to 3.6v, v gnd = 0, p in = 34dbmv, txen = shdn = high, t a = -40 c to +85 c. typical parameters are at t a = +25 c, unless otherwise specified.) (note 1) 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 , out+, out-..................................................-0.5v to +6.5v input voltage levels (all inputs) .................-0.3v to (v cc + 0.3v) continuous input voltage (in+, in-)....................................2v p-p continuous current (out+, out-) ...................................175ma continuous power dissipation (t a = +85 c) 20-pin qfn (derate 27mw/ c above +85 c) .............1600mw 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 parameter symbol conditions min typ max units supply voltage v cc 3.1 3.6 v d7 = 1, gain code = 115 (a v = 27db) 235 287 supply-current transmit mode i cc d7 = 0, gain code = 92 (a v = 0db) 55 ma supply-current transmit disable mode i cc txen = low 4.8 7 ma supply-current low-power standby i cc shdn = low 5 a logic inputs input high voltage v inh 2 v input low voltage v inl 0.8 v input high current i biash v inh = v cc 100 a input low current i biasl v inl = 0v -100 a parameter symbol conditions min typ max units d7 = 1, gain code = 119, t a = 0 c to +85 c 27 28.5 30 d7 = 1, gain code = 99, t a = 0 c to +85 c 17 18.5 20 d7 = 1, gain code = 83, t a = 0 c to +85 c 9 10.5 12 d7 = 0, gain code = 112, t a = 0 c to +85 c 8 9.5 11 d7 = 0, gain code = 92, t a = 0 c to +85 c -2 -0.5 1 d7 = 0, gain code = 72, t a = 0 c to +85 c -12 -10.5 -9 voltage gain, f in = 5mhz a v d7 = 0, gain code = 43, t a = 0 c to +85 c -26.5 -25 -23.5 db voltage gain, f in = 65mhz a v d7 = 1, gain code = 119, t a = -40 c to +85 c (note 2) 26.3 db
max3503 upstream catv amplifier _______________________________________________________________________________________ 3 ac electrical characteristics (continued) (max3503 ev kit, v cc = 3.1v to 3.6v, v gnd = 0, p in = 34dbmv, txen = shdn = high, t a = -40 c to +85 c. typical parameters are at t a = +25 c, unless otherwise specified.) (note 1) parameter symbol conditions min typ max units v out = 61dbmv, f in = 5mhz to 42mhz, (note 2) -0.6 -1.2 gain rolloff v out = 61dbmv, f in = 5mhz to 65mhz, (note 2) -1.1 -1.9 db f in = 5mhz to 65mhz, a v = -26db to 27db 0.5 f in = 5mhz to 65mhz, a v = -26db to 27db, any 2-bit transition of d0, d1 0.7 1 1.3 gain step size f in = 5mhz to 65mhz, d7 = 0, gain code = 112, to d7 = 1, gain code = 83 0.65 1 1.35 db transmit-disable mode noise txen = low, bw = 160khz, f in = 5mhz to 65mhz (note 2) -65 dbmv isolation in transmit-disable mode txen = low, f in = 5mhz to 65mhz (note 2) 60 db transmit mode noise bw = 160khz, f in = 5mhz to 65mhz, a v = -26db to 27db (note 2) -55 dbc transmit enable transient duration txen input rise/fall time < 0.1s, t a = +25 c (note 2) 2 s transmit disable transient duration txen input rise/fall time < 0.1s, t a = +25 c (note 2) 2 s d7 = 1, gain code = 115 (a v = 27db), t a = +25 c 30 80 d7 = 0, gain code = 83 (a v = 11db), t a = -40 c to +85 c 20 transmit disable/transmit enable transient step size d7 = 0, gain code = 92 (a v = 0db), t a = +25 c 3 mv p-p input impedance z in f in = 5mhz to 65mhz, differential (note 2) 2 k ? output return loss f in = 5mhz to 65mhz, in 75 ? system, d7 = 1, gain code = 119, (a v = 27db) 10 db output return loss in transmit- disable mode f in = 5mhz to 65mhz, in 75 ? system, txen = low 10 db
max3503 upstream catv amplifier 4 _______________________________________________________________________________________ parameter symbol conditions min typ max units input tones at 42mhz and 42.2mhz, both 31dbmv, v out = 58dbmv/tone (note 2) -53 -47 two-tone third-order distortion im3 input tones at 65mhz and 65.2mhz, both 31dbmv, v out = 58dbmv/tone -49 dbc f in = 33mhz, v out = 61dbmv -55 -50 2nd harmonic distortion hd2 f in = 65mhz, v out = 61dbmv (note 2) -55 -50 dbc f in = 22mhz, v out = 61dbmv -55 -50 3rd harmonic distortion hd3 f in = 65mhz, v out = 61dbmv -55 -50 dbc ac electrical characteristics (continued) (max3503 ev kit, v cc = 3.1v to 3.6v, v gnd = 0, p in = 34dbmv, txen = shdn = high, t a = -40 c to +85 c. typical parameters are at t a = +25 c, unless otherwise specified.) (note 1) parameter symbol conditions min typ max units sen-to-sclk rise set time t sens 20 ns sen-to-sclk rise hold time t senh 10 ns sda-to-sclk setup time t sdas 10 ns sda-to-sclk hold time t sdah 20 ns sda pulse width high t datah 50 ns sda pulse width low t datal 50 ns sclk pulse width high t sclkh 50 ns sclk pulse width low t sclkl 50 ns timing characteristics (v cc = 3.1v to 3.6v, v gnd = 0v, txen = shdn = high, d7 = 1, t a = +25 c, unless otherwise specified.) (note 2) note 1: all parameters guaranteed by design and characterization to 3 sigma for t a < +25 c, unless otherwise specified. note 2: guaranteed by design and characterization to 6 sigma.
max3503 upstream catv amplifier _______________________________________________________________________________________ 5 60 30 0 90 120 150 180 210 240 270 -50 0 -25 25 50 75 100 supply current vs. temperature max3503 toc01 temperature ( c) supply current (ma) transmit-enable mode, high power, gain code = 119 transmit-enable mode, low noise, gain code = 100 transmit-disable mode 120 90 60 30 0 180 150 240 210 270 330 360 300 390 0406080 20 100 120 140 supply current vs. gain code max3503 toc02 gain code supply current (ma) high-power mode low-noise mode 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 2.9 3.1 3.0 3.2 3.3 3.4 3.5 3.6 voltage gain vs. supply voltage high-power mode max3503 toc03 supply voltage (v) voltage gain (db) gain code = 119 -40 c +25 c +85 c -29.0 -28.5 -28.0 -27.5 -27.0 -26.5 -26.0 -25.5 -25.0 2.9 3.1 3.0 3.2 3.3 3.5 3.4 3.6 voltage gain vs. supply voltage low-noise mode max3503 toc04 supply voltage (v) voltage gain (db) gain code = 43 -40 c +25 c +85 c 27.0 27.6 27.4 27.2 27.8 28.0 28.2 28.4 28.6 28.8 29.0 -40 10 -15 35 60 85 voltage gain vs. temperature high-power mode max3503 toc05 temperature ( c) voltage gain (db) v cc = 3.6v v cc = 3.0v v cc = 3.3v gain code = 119 -10.0 -9.4 -9.6 -9.8 -9.2 -9.0 -8.8 -8.6 -8.4 -8.2 -8.0 -40 10 -15 35 60 85 voltage gain vs. temperature low-noise mode max3503 toc06 temperature ( c) voltage gain (db) gain code = 80 v cc = 3.0v v cc = 3.3v v cc = 3.6v 30 -15 1 1000 100 10 voltage gain vs. frequency high-power mode 0 -10 20 10 35 5 -5 25 15 max3503 toc07 frequency (mhz) voltage gain (db) a b c d gain code a = 119, b = 99, c = 82, d = 62 -40 -30 1 1000 100 10 voltage gain vs. frequency low-noise mode 20 -10 -20 10 0 max3503 toc08 frequency (mhz) voltage gain (db) a b c d gain code a = 112, b = 92, c = 72, d = 43 -35 -10 -15 -20 -25 -30 0 -5 10 5 15 25 30 20 35 30 50 60 70 40 80 90 100 120 110 voltage gain vs. gain code max3503 toc09 gain code voltage gain (db) high-power mode low-noise mode typical operating characteristics ( typical application circuit , v cc = 3.3v, v in = 34dbmv, txen = shdn = high, f in = 20mhz, z load = 75 ? , t a = +25 c, unless oth- erwise noted.)
max3503 upstream catv amplifier 6 _______________________________________________________________________________________ typical operating characteristics (continued) ( typical application circuit , v cc = 3.3v, v in = 34dbmv, txen = shdn = high, f in = 20mhz, z load = 75 ? , t a = +25 c, unless oth- erwise noted.) 0.0 0.3 0.2 0.1 0.5 0.4 0.9 0.8 0.7 0.6 1.0 60 70 80 90 100 110 120 gain step vs. gain code high-power mode max3503 toc10 gain code gain step (db) 0.2 0.1 0.4 0.3 0.6 0.5 0.7 0.9 0.8 1.0 30 50 60 70 40 80 90 100 110 120 gain step vs. gain code low-noise mode max3503 toc11 gain code gain step (db) -55 -45 -50 -35 -40 -25 -30 -20 30 70 50 90 110 130 transmit noise vs. gain code max3503 toc12 gain code output noise (dbmv in 160khz) high-power mode low-noise mode -95 -85 -90 -70 -75 -80 -55 -60 -65 -50 03040 10 20 50 60 70 2nd harmonic distortion vs. input frequency max3503 toc13 input frequency (mhz) 2nd harmonic distortion (dbc) 61dbmv, hp 50dbmv, hp 20dbmv, ln 6dbmv, ln -90 -85 -70 -75 -80 -55 -60 -65 -50 03040 10 20 50 60 70 3rd harmonic distortion vs. input frequency max3503 toc14 input frequency (mhz) 3rd harmonic distortion (dbc) 20dbmv, ln 6dbmv, ln 50dbmv, hp 61dbmv, hp 0.1 0 20 140 100 120 40 60 80 power-up/down transients vs. gain code 1 10 100 max3503 toc15 gain code transient level (mv p-p ) high-power mode low-noise mode output return loss vs. frequency (75 ? system) max3503 toc16 frequency (mhz) output return loss (db) 0 -30 -25 -20 -15 -10 -5 1 10 100 high-power mode low-noise mode/ transmit-disable mode output impedance (75 ? system) max3503 toc17 low-noise mode/ transmit- disable mode high-power mode -70 -80 -50 -60 -30 -40 -20 0 -10 10 500khz/div (db) output spectrum max3503 toc18 v out = 61dbmv = 0.25 1280ksps
max3503 upstream catv amplifier _______________________________________________________________________________________ 7 typical operating characteristics (continued) ( typical application circuit , v cc = 3.3v, v in = 34dbmv, txen = shdn = high, f in = 20mhz, z load = 75 ? , t a = +25 c, unless oth- erwise noted.) pin description pin name description 1v cc programmable-gain amplifier (pga) 3.3v supply. bypass to gnd with a 0.1f decoupling capacitor as close to the part as possible. 2 in+ positive pga input. along with in-, this port forms a high-impedance differential input to the pga. driving this port differentially increases the rejection of second-order distortion at low output levels. 3 gnd pga rf ground. as with all ground connections, maintain the shortest possible (low-inductance) length to the ground plane. 4 in- negative pga input. when not used, this port must be ac-coupled to ground. see in+. 5 gnd ground 6 sda serial-interface data. ttl-compatible input. see serial interface section. 7 sclk serial-interface clock. ttl-compatible input. see serial interface section. 8 cs serial-interface enable. ttl-compatible input. see serial interface section. 9 txen transmit enable. drive txen high to place the device in transmit-enable mode. 10 shdn shutdown. when shdn is set low, all functions (including the serial interface) are disabled. 11,13,17 20 n.c. no connection 12 out- negative output. along with out+, this port forms a 75 ? impedance output. this port is matched to a 75 ? load using a 1:1 transformer. 14 out+ positive output. see out-. 15 v cc output amplifier bias, 3.3v supply. bypass to gnd with a 0.1f decoupling capacitor as close to the part as possible. 16 cext rf output bypass. bypass to gnd with a 0.1f capacitor. exposed paddle gnd ground -70 -80 -50 -60 -30 -40 -20 0 -10 10 100khz/div output spectrum max3503 toc19 (db) v out = 61dbmv = 0.25 160ksps -70 -80 -50 -60 -30 -40 -20 0 -10 10 6mhz/div output spectrum max3503 toc20 (db) v out = 61dbmv = 0.25 1280ksps
max3503 detailed description programmable-gain amplifier the pga consists of the variable-gain amplifier (vga) and the digital-to-analog converter (dac), which pro- vide better than 56db of output-level control in 0.5db steps. the pga is implemented as a programmable gilbert-cell attenuator. the gain of the pga is deter- mined by a 7-bit word (d6 d0) programmed through the serial data interface (tables 1 and 2). specified performance is achieved when the input is driven differentially. the device may be driven single ended. to drive the device in this manner, one of the input pins must be capacitively coupled to ground. use a capacitor value large enough to allow for a low- impedance path to ground at the lowest frequency of operation. for operation down to 5mhz, a 0.001f capacitor is recommended. output amplifiers the output amplifiers are class a differential amplifiers, capable of driving 61dbmv (qpsk) differentially. this architecture provides superior even-order distortion performance but requires that a transformer be used to convert to a single-ended output. in transmit-disable mode, the output amplifiers are powered down. a resis- tor is placed across the output, so that the output impedance remains matched when the amplifier is in transmit-disable mode. disabling the output devices also results in low output noise. to match the output impedance to a 75 ? load, the trans- former must have a turns ratio of 1:1. the differential amplifier is biased directly from the 3.3v supply using the center tap of the output transformer. this provides a sig- nificant benefit when switching between transmit mode and transmit-disable mode. stored energy due to bias currents cancels within the transformer and prevents switching transients from reaching the load. serial interface the serial interface has an active-low enable ( cs ) to bracket the data, with data clocked in msb first on the rising edge of sclk. data is stored in the storage latch on the rising edge of cs . the serial interface controls the state of the pga and the output amplifiers. tables 1 and 2 show the register format. serial-interface timing is shown in figure 1. upstream catv amplifier 8 _______________________________________________________________________________________ functional diagram max3503 gnd sda sclk out- out+ in+ in- v cc txen cext bias control shdn high power low noise d/a converter serial data interface cs
applications information high-power and low-noise modes the max3503 has two transmit modes, high power (hp) and low noise (ln). each of these modes is actu- ated by the high-order bit, d7, of the 8-bit programming word. when d7 is a logic 1, hp mode is enabled. when d7 is a logic 0, ln mode is enabled. each of these modes is characterized by the activation of a distinct output stage. in hp mode, the output stage exhibits 10.5db higher gain than ln mode. the lower gain of ln output stage allows for significantly lower output noise and lower transmit-enable/transmit-disable transients. the full range of gain codes (d6 d0) can be used in either mode. for docsis applications, hp mode is rec- ommended for output levels at or above 10.5dbmv (d7 = 1, gain code = 83), ln mode when the output level is below 9.5dbmv (d7 = 0, gain code = 112). shutdown mode in normal operation, the shutdown pin ( shdn ) is held high. when shdn is taken low, all circuits within the ic are disabled. only leakage currents flow in this state. data stored within the serial-data interface latches are lost upon entering this mode. current consumption is reduced to 5a (typ) in shutdown mode. transformer to match the output of the max3503 to a 75 ? load, a 1:1 transformer is required. this transformer must have adequate bandwidth to cover the intended application. note that most rf transformers specify bandwidth with a 50 ? source on the primary and a matching resis- tance on the secondary winding. operating in a 75 ? system tends to shift the low-frequency edge of the transformer bandwidth specification up by a factor of 1.5, because of primary inductance. keep this in mind when specifying a transformer. bias to the output stage is provided through the center tap on the transformer primary. this greatly diminishes the on/off transients present at the output when switch- ing between transmit and transmit-disable modes. commercially available transformers typically have adequate balance between half-windings to achieve substantial transient cancellation. finally, keep in mind that transformer core inductance varies proportionally with temperature. if the application requires low temperature extremes (less than 0 c), adequate primary inductance must be present to sus- tain low-frequency output capability as temperatures drop. in general this is not a problem, as modern rf transformers have adequate bandwidth. input circuit to achieve rated performance, drive the inputs of the max3503 differentially with an appropriate input level. the differential input impedance is approximately 2k ? . most applications requires a differential lowpass filter preceding the device. the filter design dictates a termi- nating impedance of a specified value. place this load impedance across the ac-coupled input pins (see the typical operating circuit ). the max3503 has sufficient gain to produce an output level of 61dbmv (qpsk) when driven with a 34dbmv input signal. when a lower input level is present, the maximum output level is reduced proportionally and output linearity increases. if an input level greater than 34dbmv is used, the 3rd-order distortion performance degrades slightly. if single-ended sources drive the max3503, one of the input terminals must be capacitively coupled to ground max3503 upstream catv amplifier _______________________________________________________________________________________ 9 a. t sens b. t sdas c. t sdah d. t sckl e. t sckh f. t senh g. t datah /t datal d0 d7 d6 d5 a g b c de f d4 d3 d2 d1 figure 1. serial-interface timing diagram bit mnemonic description msb 7 d7 high-power/low-noise mode select 6 d6 gain code, bit 6 5 d5 gain code, bit 5 4 d4 gain code, bit 4 3 d3 gain code, bit 3 2 d2 gain code, bit 2 1 d1 gain code, bit 1 lsb 0 d0 gain code, bit 0 table 1. serial-interface control word
max3503 upstream catv amplifier 10 ______________________________________________________________________________________ (in+ or in-). the value of this capacitor must be large enough to look like a short circuit at the lowest frequen- cy of interest. for operation at 5mhz with a 75 ? source impedance, a value of 0.001f suffices. layout issues a well-designed pc board is an essential part of an rf circuit. for best performance, pay attention to power-sup- ply layout issues as well as to the output circuit layout. output circuit layout the differential implementation of the max3503 s out- put has the benefit of significantly reducing even-order distortion, the most significant of which is 2nd harmonic distortion. the degree of distortion cancellation depends on the amplitude and phase balance of the overall circuit. keep the trace lengths from the output pins equal. power-supply layout for minimal coupling between different sections of the ic, the ideal power-supply layout is a star configuration. this configuration has a large-value decoupling capac- itor at the central power-supply node. the power- supply traces branch out from this node, each going to a separate power-supply node in the circuit. at the end of each of these traces is a decoupling capacitor that provides very low impedance at the frequency of inter- est. this arrangement provides local power-supply decoupling at each power-supply pin. the power-supply traces must be made as thick as is practical. ground inductance degrades distortion per- formance. therefore, make ground plane connections with multiple vias. exposed-paddle thermal considerations the max3503 s 20-pin qfn package provides a low thermal-resistance path to the die. the pc board on which the max3503 is mounted must be designed to conduct heat from this contact. in addition, the ep should be provided with a low-inductance path to elec- trical ground. maxim recommends that the ep be sol- dered to a ground plane on the pc board, either directly or through an array of plated via holes. chip information transistor count: 1180 substrate connected to gnd shdn txen d7 d6 d5 d4 d3 d2 d1 d0 gain code (decimal) states 0 x x x x x x x x x shutdown mode 1 0 x x x x x x x x transmit-disable mode 1 1 1 x x x x x x x transmit-enable mode, high power 1 1 0 x x x x x x x transmit-enable mode, low noise 1 1 0 0 1 1 0 0 0 0 43 a v = -26.0db* 1 1 0 1 0 1 0 0 0 0 92 a v = -0.5db* 1 1 0 1 1 0 1 1 1 0 112 a v = -95db* 1 1 1 1 0 1 0 1 1 0 83 a v = -10.5db* 1 1 1 1 1 0 1 1 1 1 99 a v = -18.5db* 1 1 1 1 1 1 0 1 1 1 119 a v = -28.5db* table 2. chip-state control bits * typical gain at +25 c, v cc = 3.3v.
max3503 upstream catv amplifier ______________________________________________________________________________________ 11 typical application circuit 10 shdn control logic max3503 9 2 txen in+ 4 1 3 in- 3.3v v cc gnd n.c. n.c. gnd 15 output 1:1 0.1 f 0.1 f 0.1 f 0.001 f 0.001 f control logic 0.1 f 3.3v 3.3v v cc 14 12 out+ out- 16 cext 6 7 5 8 gnd sclk sda cs n.c. n.c. input + - anti-alias filter
max3503 upstream catv amplifier 12 ______________________________________________________________________________________ 32l qfn .eps 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 .)
upstream catv amplifier max3503 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) (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 max3503 part number table notes: see the max3503 quickview data sheet for further information on this product family or download the max3503 full data sheet (pdf, 408kb). 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 max3503egp qfn;20 pin;5x5x0.9mm dwg: 21-0091i (pdf) use pkgcode/variation: g2055-1 * -40c to +85c rohs/lead-free: no materials analysis MAX3503EGP-T -40c to +85c rohs/lead-free: no 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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