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general description the MAX2058 high-linearity digital-variable-gain ampli- fier (dvga) is designed to provide 62db of total gain range and typical output ip3 and output p1db levels of +32.3dbm and +19dbm, respectively. the device is ideal for a variety of applications, including rfid hand- held and portal readers, as well as single and multicar- rier 700mhz to 1200mhz gsm/edge, cdma2000 , wcdma, and iden base stations. the MAX2058 yields a high level of component integration, which includes two 5-bit, 31db digital attenuators, a two-stage driver amplifier, a loopback mixer, and a serial interface to control the attenuators. the MAX2058 is pin compatible with the max2059 1800mhz to 2200mhz dvga, facilitating an easy design-in for applications where a common pc board layout is used for both frequency bands. the MAX2058 is available in a 40-pin thin qfn pack- age with an exposed paddle. electrical performance is guaranteed over a -40? to +85? temperature range. applications gsm 850/gsm 900 2g and 2.5g edge base- station transmitters and power amplifiers cellular cdmaone, cdma2000, and integrated digital enhanced network (iden) base-station transmitters and power amplifiers wcdma 850mhz and other 3g base-station transmitters and power amplifiers transmitter gain control receiver gain control broadband systems automatic test equipment digital and spread-spectrum communication systems microwave terrestrial links rfid handheld and portal readers features +32.3dbm typical output ip3 +19dbm typical output 1db compression point 700mhz to 1200mhz rf frequency range 1800mhz to 2200mhz rf frequency range (max2059) 10.5db typical small-signal gain includes two independent 31db attenuator stages, yielding 62db of total gain-control range with 1db steps 3-wire spi?/microwire?-compatible integrated loopback mixer for tx/rx self- diagnostics +5v single-supply operation external current-setting resistors for scalable device power lead-free package available MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer ________________________________________________________________ maxim integrated products 1 ordering information 19-0512; rev 0; 6/06 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. evaluation kit available ** ep = exposed paddle. + denotes lead-free package. t = tape-and-reel. pin configuration/functional diagram appears at end of data sheet. spi is a trademark of motorola, inc. microwire is a trademark of national semiconductor corp. cdma2000 is a registered trademark of telecommunications industry association. iden is a registered trademark of motorola, inc. cdmaone is a trademark of cdma development group. part temp range pin-package pkg code MAX2058etl -40c to +85c 40 thi n q fn - e p ** (6mm x 6mm) t4066-3 MAX2058etl-t -40c to +85c 40 thi n q fn - e p ** ( 6m m x 6m m ) t4066-3 MAX2058etl+ -40c to +85c 40 thi n q fn - e p ** ( 6m m x 6m m ) t4066-3 MAX2058etl+t -40c to +85c 40 thi n q fn - e p ** ( 6m m x 6m m ) t4066-3
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, r1 = 1.2k ? , r2 = 3.92k ? , r3 = 2k ? , t c = -40? to +85?. typical values are at v cc = +5.0v and t c = +25?, unless otherwise noted.) (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 to gnd ...........................................................-0.3v to +5.5v rset1, rset2......................................................+1.2v to +4.0v lbbias .......................................................(v cc - 1.5v) to +5.5v lb_en, data, cs , clk .............................-0.3v to (v cc + 0.3v) atten_ina, atten_inb, atten_outa, atten_outb input power .................................................................+24dbm ampin, differential lo input power ...............................+12dbm continuous power dissipation (t a = +70?) 40-pin tqfn (derated 26.3mw/? above +70?) ......2100mw operating temperature range (note a) .............-40? to +85? junction temperature ......................................................+150? jc ....................................................................................10?/w ja ....................................................................................38?/w storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? ac electrical characteristics (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, p lo = -6dbm, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) (note 1) note a: t c is the temperature on the exposed paddle of the package. parameter symbol conditions min typ max units supply voltage v cc reference to v cc , vcclb, vcclogic, vccbias1, vccbias2, vccamp 4.75 5.0 5.25 v lb mixer disabled (lb_en = 1) 134 156 total supply current i cc lb mixer enabled (lb_en = 0) 158 186 ma logic inputs (data, cs , clk, lb_en) input high voltage v ih 2.4 v input low voltage v il 0.8 v input current with logic-high i ih 0.01 ? input current with logic-low i il 0.01 ? parameter symbol conditions min typ max units MAX2058 700 1200 rf frequency (note 2) max2059 1800 2200 mhz small-signal gain a v f rf = 940mhz, t c = +25? 8.4 10.5 12.8 db t c = -40? to +25? -0.014 gain variation vs. temperature all attenuation settings t c = +25? to +85? -0.021 db/? output power p out p in = 0dbm, f rf = 940mhz, t c = +25? 8.4 10.5 12.8 dbm 800mhz to 900mhz 0.13 output power flatness p in = 0dbm 900mhz to 1000mhz -0.52 db attenuation range 62 db output third-order intercept point oip3 two tones: f rf1 = 940mhz, f rf2 = 941mhz, p out1 = p out2 = +5dbm 32.3 dbm
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer _______________________________________________________________________________________ 3 ac electrical characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, p lo = -6dbm, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units output -1db compression point (note 3) op 1db 19 dbm rms error vector magnitude evm p out = +12dbm, edge modulation 0.5 % 200khz offset -39.2 400khz offset -73.5 600khz offset -82.7 spurious emissions in 30khz bandwidth (note 4) p out = +12dbm, edge modulation 1.2mhz offset -85.7 dbc noise figure nf 6.8 db input return loss 50 ? source, minimum attenuation setting 18 db output return loss 50 ? load, minimum attenuation setting 20 db 5-bit digital attenuators insertion loss attenuator measured separately z s = z l = 50 ? 3.3 db input third-order intercept point iip3 attenuator measured separately z s = z l = 50 ? , two tones: f rf1 = 940mhz, f rf2 = 941mhz, p in1 = p in2 = +5dbm 44 dbm control range 31 db 800mhz to 900mhz ?.08 attenuation step size variation vs. frequency 900mhz to 1000mhz ?.06 db 800mhz to 1000mhz, t c = -40? to +25? ?.002 attenuation variation vs. temperature 800mhz to 1000mhz, t c = +25? to +85? ?.003 db/? step size 1db relative step accuracy 800mhz to 1000mhz -0.2 +0.4 db absolute step accuracy 800mhz to 1000mhz -0.2 +0.5 db spurious emissions in 300khz bandwidth (note 5) no rf input, attenuator a stepped from 0 to 2db, 7db to 9db, 15db to 17db, 0 to 31db, 31db to 0db, with attenuator b at 0db; attenuator b stepped from 0 to 2db, 7db to 9db, 15db to 17db, 0 to 31db, 31db to 0db, with attenuator a at 0db -85 dbm switching speed from chip select transitioning high to the output settling to within 1db of steady state output 0.3 ?
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 4 _______________________________________________________________________________________ ac electrical characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, p lo = -6dbm, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) (note 1) note 1: all limits include external component losses. output measurements taken at rfout or lbout ports of the typical application circuit . note 2: operating outside this range is possible, but with degraded performance of some parameters. note 3: compression point characterized. it is advisable not to continuously operate the vga rf input above +15dbm. note 4: input rf source contribution to spurious emissions (agilent esg 4435b, psa e4443a): 200khz = -39.2dbc, 400khz = -73.5dbc, 600khz = -83.2dbc, 1.2mhz = -85.7dbc note 5: no spi clock input applied. note 6: guaranteed by design and characterization. parameter symbol conditions min typ max units loopback mixer lo frequency (note 2) f lo 40 100 mhz lo input power p lo -6 0 dbm output power (note 6) p in = +5dbm, f rf = 940mhz, t c = +25? -14.7 -12.7 -10.8 dbm 800mhz to 900mhz ?.7 gain accuracy p in = +5dbm, t c = -40? to +25? 900mhz to 1000mhz ?.7 db output third-order intercept point (note 6) oip3 tw o tones: f r f1 = 940m h z, f r f2 = 940.2m h z, p in 1 = p in 2 = + 2d bm , t c = + 25c 10.6 dbm output noise floor p in = +5dbm -137 dbc/hz lb_en enable time 0.12 on/off switching time lb_en disable time 0.12 ? lbout to atten_outb isolation mixer enabled, attenuators a and b both set to 31db, p in = +5dbm 67 db atten_outb to lbout isolation mixer disabled, p in = 0dbm 50 db mixer enabled, 50 ? load 22 output return loss mixer disabled, 50 ? load 23 db lo port return loss 50 ? source 32 db serial peripheral interface (spi) maximum clock speed 38 mhz data to clock setup time t cs 1ns data to clock hold time t ch 9ns clock to cs setup time t es 4ns cs positive pulse width t ew 18 ns cs negative pulse width t ewn 24 ns clock pulse width t cw 13 ns
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer _______________________________________________________________________________________ 5 t ypical operating characteristics (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) gain vs. rf frequency (maximum gain) rf frequency (mhz) gain (db) MAX2058 toc01 700 800 900 1000 1100 1200 6 7 8 9 10 11 12 13 t c = +25 c t c = +5 c t c = +85 c t c = -40 c gain vs. rf frequency (maximum gain) rf frequency (mhz) gain (db) MAX2058 toc02 6 8 7 10 9 12 11 13 700 900 800 1000 1100 1200 v cc = 4.75v v cc = 5.0v v cc = 5.25v gain vs. rf frequency adjusting atten a rf frequency (mhz) gain (db) MAX2058 toc03 700 800 900 1000 1100 1200 -25 -15 -5 5 15 a tten a abs accuracy vs. rf frequency rf frequency (mhz) error (db) MAX2058 toc04 700 800 900 1000 1100 1200 -1.0 -0.5 0 0.5 1.0 a tten a rel accuracy vs. rf frequency rf frequency (mhz) error (db) MAX2058 toc05 700 800 900 1000 1100 1200 -1.0 -0.5 0 0.5 1.0 gain vs. rf frequency adjusting atten b rf frequency (mhz) gain (db) MAX2058 toc06 700 800 900 1000 1100 1200 -25 -15 -5 5 15 a tten b abs accuracy vs. rf frequency rf frequency (mhz) error (db) MAX2058 toc07 700 800 900 1000 1100 1200 -1.0 -0.5 0 0.5 1.0 a tten b rel accuracy vs. rf frequency rf frequency (mhz) error (db) MAX2058 toc08 700 800 900 1000 1100 1200 -1.0 -0.5 0 0.5 1.0 output ip3 vs. rf frequency rf frequency (mhz) output ip3 (dbm) MAX2058 toc09 800 850 900 950 1000 29 30 31 32 33 34 t c = +85 c t c = +5 c t c = +25 c t c = -40 c
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 6 _______________________________________________________________________________________ t ypical operating characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) output p 1db vs. rf frequency rf frequency (mhz) output p 1db (dbm) MAX2058 toc13 700 800 900 1000 1100 1200 14 15 16 17 18 19 20 21 22 t c = +85 c t c = +25 c t c = +5 c t c = -40 c output p 1db vs. rf frequency rf frequency (mhz) output p 1db (dbm) MAX2058 toc14 700 800 900 1000 1100 1200 14 15 16 17 18 19 20 21 22 v cc = 4.75v v cc = 5.0v v cc = 5.25v input return loss vs. rf frequency a tten a varied rf frequency (mhz) input return loss (db) MAX2058 toc15 700 800 900 1000 1100 1200 0 5 10 15 20 25 30 8db 0db 2db 4db 1db 16db, 31db input return loss vs. rf frequency a tten b varied rf frequency (mhz) input return loss (db) MAX2058 toc16 700 800 900 1000 1100 1200 0 5 10 15 20 25 30 31db 0db, 1db output return loss vs. rf frequency a tten a varied rf frequency (mhz) output return loss (db) MAX2058 toc17 700 800 900 1000 1100 1200 0 10 20 30 40 0db 31db output return loss vs. rf frequency a tten b varied rf frequency (mhz) output return loss (db) MAX2058 toc18 700 800 900 1000 1100 1200 0 10 20 30 40 1db 0db 8db 16db, 31db 4db 2db output ip3 vs. rf frequency rf frequency (mhz) output ip3 (dbm) MAX2058 toc10 800 850 900 950 1000 29 30 31 32 33 34 v cc = 5.0v v cc = 4.75v v cc = 5.25v noise figure vs. rf frequency rf frequency (mhz) noise figure (db) MAX2058 toc11 700 800 900 1000 1100 1200 4 5 6 7 8 9 10 t c = +85 c t c = +5 c t c = +25 c t c = -40 c noise figure vs. rf frequency rf frequency (mhz) noise figure (db) MAX2058 toc12 700 800 900 1000 1100 1200 4 5 6 7 8 9 10 v cc = 4.75v v cc = 5.0v v cc = 5.25v
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer _______________________________________________________________________________________ 7 t ypical operating characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) reverse gain vs. rf frequency adjusting atten a and b rf frequency (mhz) gain (db) MAX2058 toc19 700 800 900 1000 1100 1200 -80 -70 -60 -50 -40 -30 atten a and b, 0db atten a, 31db atten b, 31db mixer conv loss vs. rf frequency rf frequency (mhz) conversion loss (db) MAX2058 toc20 800 850 900 950 1000 14 15 16 17 18 19 20 t c = +5 c t c = -40 c t c = +85 c t c = +25 c mixer conv loss vs. rf frequency rf frequency (mhz) conversion loss (db) MAX2058 toc21 800 850 900 950 1000 14 15 16 17 18 19 20 v cc = 5.0v v cc = 4.75v v cc = 5.25v mixer conv loss vs. rf frequency rf frequency (mhz) conversion loss (db) MAX2058 toc22 800 850 900 950 1000 14 15 16 17 18 19 20 p lo = 0dbm p lo = -3dbm p lo = -6dbm mixer output ip3 vs. rf frequency rf frequency (mhz) output ip3 (dbm) MAX2058 toc23 800 850 900 950 1000 7 8 9 10 11 12 13 t c = +85 c t c = +5 c t c = +25 c t c = -40 c mixer output ip3 vs. rf frequency rf frequency (mhz) output ip3 (dbm) MAX2058 toc24 800 850 900 950 1000 7 8 9 10 11 12 13 v cc = 4.75v v cc = 5.0v v cc = 5.25v mixer output ip3 vs. rf frequency rf frequency (mhz) output ip3 (dbm) MAX2058 toc25 800 850 900 950 1000 7 8 9 10 11 12 13 p lo = -6dbm p lo = 0dbm p lo = -3dbm, 0dbm mixer output return loss vs. rf frequency (mixer enabled) rf frequency (mhz) mixer out return loss (db) MAX2058 toc26 700 800 900 1000 1100 1200 0 10 20 30 40 t c = +85 c t c = +25 c t c = +5 c t c = -40 c mixer output return loss vs. rf frequency (mixer enabled) rf frequency (mhz) mixer out return loss (db) MAX2058 toc27 700 800 900 1000 1100 1200 0 10 20 30 40 v cc = 4.75v, 5.0v, 5.25v
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 8 _______________________________________________________________________________________ t ypical operating characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) mixer output return loss vs. rf frequency (mixer disabled) rf frequency (mhz) mixer out return loss (db) MAX2058 toc28 700 800 900 1000 1100 1200 0 10 20 30 40 t c = +85 c t c = +25 c t c = +5 c t c = -40 c mixer output return loss vs. rf frequency (mixer disabled) rf frequency (mhz) mixer out return loss (db) MAX2058 toc29 700 800 900 1000 1100 1200 0 10 20 30 40 v cc = 4.75v, 5.0v, 5.25v lo return loss vs. lo frequency (mixer enabled) lo frequency (mhz) lo return loss (db) MAX2058 toc30 050 100 150 200 0 10 20 30 40 t c = -40 c t c = +5 c t c = +25 c t c = +85 c lo return loss vs. lo frequency (mixer enabled) lo frequency (mhz) lo return loss (db) MAX2058 toc31 150 100 50 30 20 10 0 40 0 200 v cc = 4.75v, 5.0v, 5.25v atten a only gain vs. rf frequency MAX2058 toc32 rf frequency (mhz) gain (db) 1000 1100 900 800 -30 -20 -10 0 -40 700 1200 atten a only gain vs. rf frequency (nmt 450mhz band) MAX2058 toc33 rf frequency (mhz) gain (db) 500 550 350 400 450 -30 -20 -10 0 -40 300 atten a only abs accuracy vs. rf frequency MAX2058 toc34 rf frequency (mhz) error (db) 1100 1000 900 800 700 -1.0 -1.5 -0.5 0 1.0 0.5 1.5 2.0 -2.0 1200 atten a only abs accuracy vs. rf frequency (nmt 450mhz band) MAX2058 toc35 rf frequency (mhz) error (db) 550 500 450 400 350 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 300 atten a only rel accuracy vs. rf frequency MAX2058 toc36 rf frequency (mhz) error (db) 1000 900 700 800 -0.5 0 0.5 1.0 -1.0 1200 1100
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer _______________________________________________________________________________________ 9 t ypical operating characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) atten b only abs accuracy vs. rf frequency MAX2058 toc40 rf frequency (mhz) error (db) 1100 1000 900 800 700 -1.0 -1.5 -0.5 0 1.0 0.5 1.5 2.0 -2.0 1200 atten b only abs accuracy vs. rf frequency (nmt 450mhz band) MAX2058 toc41 rf frequency (mhz) error (db) 550 500 450 400 350 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 300 atten a only rel accuracy vs. rf frequency (nmt 450mhz band) MAX2058 toc37 rf frequency (mhz) error (db) 500 450 400 350 300 -0.5 0 0.5 1.0 -1.0 550 atten b only gain vs. rf frequency MAX2058 toc38 rf frequency (mhz) gain (db) 1000 1100 900 800 -30 -20 -10 0 -40 700 1200 atten b only gain vs. rf frequency (nmt 450mhz band) MAX2058 toc39 rf frequency (mhz) gain (db) 500 550 350 400 450 -30 -20 -10 0 -40 300
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 10 ______________________________________________________________________________________ t ypical operating characteristics (continued) (MAX2058 typical application circuit , v cc = +4.75v to +5.25v, digital attenuators set for maximum gain, 700mhz f rf 1200mhz, 40mhz f lo 100mhz, t c = -40? to +85?. typical values are at v cc = 5.0v, p in = 0dbm, f rf = 940mhz, f lo = 45mhz, f lbout = f rf - f lo , and t c = +25?, unless otherwise noted.) atten b only rel accuracy vs. rf frequency MAX2058 toc42 rf frequency (mhz) error (db) 1000 900 700 800 -0.5 0 0.5 1.0 -1.0 1200 1100 atten b only rel accuracy vs. rf frequency (nmt 450mhz band) MAX2058 toc43 rf frequency (mhz) error (db) 500 450 400 350 300 -0.5 0 0.5 1.0 -1.0 550 supply current vs. supply voltage (mixer disabled) v cc (v) supply current (ma) MAX2058 toc44 4.750 4.875 5.000 5.125 5.250 110 120 130 140 150 t c = +25 c t c = +5 c t c = -40 c t c = +85 c supply current vs. supply voltage (mixer enabled) v cc (v) supply current (ma) MAX2058 toc45 4.750 4.875 5.000 5.125 5.250 130 140 150 160 170 180 t c = +85 c t c = +5 c t c = -40 c t c = +25 c
MAX2058 pin description 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer ______________________________________________________________________________________ 11 pin name function 1 lo+ loopback mixer local oscillator positive input 2 lo- loopback mixer local oscillator negative input 3 vcclb loopback mixer supply voltage. +5v supply for the internal loopback mixer. bypass to gnd with 100pf and 0.1? capacitors as close as possible to the pin. 4 lbout loopback mixer rf output. internally matched to 50 ? . ac-couple with a capacitor. 5 lb_en loop b ack m i xer log i c inp ut. s et to l og i c- l ow 0 to enab l e the m i xer . s et to l og i c- hi g h 1 to d i sab l e the m i xer . 6 data spi digital data input 7 clk spi clock input 8 cs spi chip-select input 9 vcclogic logic supply voltage. +5v supply for the internal logic circuitry. bypass to gnd with 100pf and 0.1? capacitors as close as possible to the pin. 10, 11, 13, 14, 16, 17, 19, 22, 24, 25, 26, 30, 32, 34, 35, 37, 38 gnd ground 12 atten_outb attenuator b output. internally matched to 50 ? . 15 v cc attenuator b supply. +5v supply for attenuator b. bypass to gnd with 100pf and 0.01? capacitors as close as possible to the pin. 18 atten_inb attenuator b input. internally matched to 50 ? . 20 rset2 output amplifier bias-current-setting resistor. sets the bias current for the output amplifier stage. connect a 3.92k ? resistor to ground. 21 vccbias2 bias circuit supply voltage. +5v supply for the internal bias circuitry. bypass to gnd with 1000pf and 0.1? capacitors as close as possible to the pin. 23 ampout rf amplifier output. internally matched to 50 ? . 27 vccamp rf amplifier supply voltage. +5v supply for the rf amplifier. bypass to gnd with 1000pf and 0.1? capacitors as close as possible to the pin. 28 ampin rf amplifier input. internally matched to 50 ? . 29 vccbias1 bias circuit supply voltage. +5v supply for the internal bias circuitry. bypass to gnd with 1000pf and 0.1? capacitors as close as possible to the pin. 31 rset1 input amplifier bias-current-setting resistor. sets the bias current for the input amplifier stage. connect a 1.2k ? resistor to ground. 33 atten_outa attenuator a output. internally matched to 50 ? . 36 v cc attenuator a supply voltage. +5v supply for attenuator a. bypass to gnd with 100pf and 0.01? capacitors as close as possible to the pin. 39 atten_ina attenuator a input. internally matched to 50 ? . 40 lbbias loopback mixer bias-current-setting resistor. sets the bias current for the mixer. connect a 2k ? resistor to ground. ep gnd exposed ground paddle. solder the exposed paddle to gnd using multiple vias.
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 12 ______________________________________________________________________________________ detailed description the MAX2058 high-linearity dvga consists of two 5-bit, 31db digital attenuators, a fixed-gain two-stage driver amplifier, a loopback mixer, and a serial interface to control the attenuators. this high level of component integration makes the MAX2058 ideal for base-station transmitter applications. the MAX2058 is designed to operate in the 700mhz to 1200mhz frequency ranges. the overall cascaded performance of the MAX2058 produces a typical 10.5db gain, a +32.3dbm oip3, a 19dbm op1db, and a total 62db gain-control range. 5-bit attenuators the MAX2058 integrates two 5-bit digital attenuators to achieve a high dynamic range. each attenuator has a 31db control range, a 1db step size, and is pro- grammed with the 3-wire spi. see the applications information section and table 1 for attenuator program- ming details. the attenuators can be used for both stat- ic and dynamic power control. driver amplifier the MAX2058 includes a two-stage medium power amplifier with a fixed 17.5db gain. the driver amplifier circuit is optimized for high linearity and medium output power capability for the 800mhz to 1000mhz frequen- cy range. the driver amplifier is intended to amplify a modulated signal and drive a high-power amplifier in base-station transmitters. in a typical application, the driver amplifier is cascaded in between the two digital attenuators. see the typical application circuit. the two-stage amplifier stage can be disabled for applications where only the digital attenuators and/or loopback mixer are used. to disable the two-stage amplifier, ground or leave unconnected the amplifier supplies vccbias2, vccamp, vccbias1, and also the inputs for setting the amplifier bias currents rset1, rset2. this reduces the supply current by approxi- mately 132ma under typical conditions. loopback mixer the MAX2058 loopback mixer uses a double-balanced active architecture designed to operate with a 700mhz to 1200mhz rf frequency range, and a 40mhz to 100mhz lo frequency range. the rf port of the mixer is connected internally (with an on-chip switch) to the input of the first attenuator stage. the mixer? if port is matched for a single-ended 50 ? impedance, while the lo port requires a differential input impedance of 100 ? . the loopback mixer facilitates a self-diagnostic mode for cellular transceivers, whereby the tx band signal at the input of the mixer can be translated up or down to the corresponding rx band. this translated signal can then be fed back to the radio? receiver for complete tx/rx loop diagnostics. the loopback mixer is enabled and disabled with lb_en. set lb_en to a logic-low 0 to enable the mixer, set lb_en to a logic-high 1 to disable the mixer. applications information spi interface and attenuator settings the two 5-bit attenuators are programmed with the 3- wire spi/microwire-compatible serial interface using 10-bit words. bit 9 of the 10-bit data is shifted in first, along with all remaining data bits, on the rising edge of the clock regardless of cs being high or low. once all the data bits are shifted in, all will be sent to the attenua- tors on the rising edge of cs , thus changing the attenua- tion state. for standard spi operation, pull cs low for the duration of a valid 10-bit data set (t ewn ). this cs nega- tive pulse width includes the setup time of the rising clock edge to cs transitioning high (t es ). see figure 1. table 1. attenuator programming figure 1. spi timing diagram attenuator a (5 msbs) attenuator b (5 lsbs) bit 9 = 16db step bit 4 = 16db step bit 8 = 8db step bit 3 = 8db step bit 7 = 4db step bit 2 = 4db step bit 6 = 2db step bit 1 = 2db step bit 5 = 1db step bit 0 = 1db step notes: data entered on clock rising edge. attenuator state change on cs rising edge. msb data clock cs bit 9 bit 8 bit 1 bit 0 lsb t cs t ch t cw t ewn t es t ew
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer ______________________________________________________________________________________ 13 figure 2. direct conversion transmitter for gsm/edge basestations the 5 msbs of the 10-bit word program attenuator a, and the 5 lsbs of the 10-bit word program attenuator b. each bit sets the attenuators to a corresponding attenuation level. for example, logic-low 0 for bit 5 and bit 0 of attenuator a and b, respectively, sets both attenuators at 1db. 00000 configures both attenuators for 31db attenuation and 11111 sets for 0db attenua- tion. see table 1 for programming details. external bias bias currents for the two-stage amplifier and the loop- back mixer are set and optimized with external resistors. resistor r1 (pin 31) sets the bias current for the input amplifier, r2 (pin 20) sets the bias current for the output amplifier, and r3 (pin 40) sets the bias for the loopback mixer. the external biasing resistor values can be increased for reduced current operation at the expense of performance. contact the factory for details. board layout the pin configuration of the MAX2058 has been opti- mized to facilitate a very compact physical layout of the device and its associated discrete components. the exposed paddle (ep) of the MAX2058? thin qfn- ep package provides a low thermal-resistance path to the die. it is important that the pc board on which the MAX2058 is mounted be designed to conduct 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. table 2. component list referring to the typical application circuit MAX2058/max2059* 90 dual dac quad amp zero-if mods/demods rf digital vgas max9491* vco + pll i 12 q 12 spi logic 31db rf out *future products?ontact factory for samples spi control loopback out (feeds back into rx chain front-end) rx off 45, 80, or 95mhz lo 17.5db 31db 0 max5873 max4395 max2021/max2022/max2023* component value description c1, c4, c10, c13, c16 0.1? microwave capacitors (0603) c2, c5, c8, c17 100pf microwave capacitors (0402) c3, c6, c14, c19 47pf microwave capacitors (0402) c7, c18 0.01? microwave capacitors (0402) c9, c12, c15 1000pf microwave capacitors (0402) c11 3.9pf microwave capacitor (0402) r1 1.2k ? ?% resistor (0402) r2 3.92k ? ?% resistor (0402) r3 2.0k ? ?% resistor (0402) r4 110 ? ?% resistor (0402) t1 2:1 rf transformer (100:50) mini-circuits tc2-1t u1 MAX2058 maxim ic
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 14 ______________________________________________________________________________________ t ypical application circuit direct-conversion base-station transmitter the MAX2058/max2059 are designed to interface directly with maxim? direct-conversion quadrature modulators and high-speed dacs to provide a com- plete solution for gsm/edge base-station transmitter applications. see figure 2. the MAX2058/max2059, together with the max2021/max2022/max2023* direct- conversion modulators/demodulators, the max5873 dual-channel dac, and the max4395 quad amplifier, form an ideal total transmitter lineup. this overall sys- tem is highly efficient and low cost, while maintaining high linearity and low noise performance. MAX2058 30 29 28 27 26 36 35 34 33 32 31 r1 gnd gnd gnd gnd gnd ampout r2 c19 c17 c18 c1 c2 c3 v cc v cc v cc c7 c8 rf input v cc gnd gnd gnd gnd gnd rset1 atten_outb atten_inb attn_ina atten_outa lbbias 40 39 38 37 15 16 17 18 19 20 11 12 13 14 25 23 21 24 22 5 4 3 2 9 8 10 7 6 1 r3 t1 r4 lo+ lo- vcclb vcclogic driver amp vccbias2 lbout lb_en data clk cs gnd gnd gnd rset2 gnd gnd gnd gnd v cc 5-bit attenuator b spi e.p. 5-bit attenuator a lo input lbout rf output c4 c5 c6 v cc c10 c11 c14 c9 v cc vccamp ampin vccbias1 c13 c12 v cc c16 c15
MAX2058 700mhz to 1200mhz high-linearity, spi-controlled dvga with integrated loopback mixer 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 ____________________ 15 2006 maxim integrated products is a registered trademark of maxim integrated products, inc. package information for the latest package outline information, go to www.maxim-ic.com/packages . pin configuration/functional block diagram chip information process: sige bicmos MAX2058 30 29 28 27 26 36 35 34 33 32 31 40 39 38 37 15 16 17 18 19 20 11 12 13 14 25 23 21 24 22 5 4 3 2 9 8 10 7 6 1 driver amp 5-bit attenuator b spi 5-bit attenuator a gnd gnd gnd gnd gnd ampout v cc gnd gnd gnd gnd gnd rset1 atten_outb atten_inb atten_ina atten_outa lbbias lo+ lo- vcclb vcclogic vccbias2 lbout lb_en data clk cs gnd gnd gnd rset2 gnd gnd gnd gnd v cc vccamp ampin vccbias1

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