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general description the max2720/MAX2721 are low-cost, high-performance, direct i/q modulators designed for use in wideband- cdma and wireless local-loop (wll) systems. their direct-upconversion architecture reduces system cost, component count, and board space compared to devices with dual-conversion architectures. the max2720/MAX2721 include an i/q modulator, a variable gain amplifier (vga), and a power amplifier (pa) driver. the quadrature modulator accepts differential baseband i/q signals and directly modulates an rf carrier in the 1.7ghz to 2.1ghz range (max2720) or the 2.1ghz to 2.5ghz range (MAX2721). the vga pro- vides 35db of output power control. the modulator? amplitude and phase balance yield 35dbc of sideband suppression and 30dbc of carrier suppression. these devices feature an lo frequency doubler that allows the external lo source to operate at half-frequency or full-frequency when disabled. the max2720/MAX2721 operate from a single +2.7v to +3.3v supply and require only 77ma (max2720) or 86ma (MAX2721) of supply current. an additional 20ma of supply current is saved by disabling the stand-alone pa driver. a low-power shutdown mode further reduces supply current to less than 0.1?. the device is packaged in the small 20-pin tssop-ep with exposed paddle to improve rf performance. applications wireless local loop (wll) wideband cdma systems lmds/mmds 2.4ghz broadband ism radios dcs/pcs base stations features rf frequency range 1.7ghz to 2.1ghz (max2720) 2.1ghz to 2.5ghz (MAX2721) integrated i/q modulator, lo doubler, vga, and pa driver 35db vga gain control range 35dbc sideband suppression 30dbc carrier suppression low supply current 77ma (max2720), 86ma (MAX2721) 20ma reduction with pa driver disabled 0.1? supply current in shutdown mode +2.7v to +3.3v single-supply operation max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ________________________________________________________________ maxim integrated products 1 4 5 20 drin 19 gnd 18 pc v cc 2 drout 1 gnd 17 modout 16 15 v cc 14 q- 7 i- 6 v cc gnd 13 q+ 12 v cc 11 lo 9 v cc 8 i+ max2720/MAX2721 3 shdn enx2 0 90 pa driver vga lo doubler lo phase shifter 10 gnd x2 bias functional diagram 19-1606; rev 0; 1/00 part max2720 eup MAX2721 eup -40? to +85? -40? to +85? temp. range pin-package 20 tssop-ep* 20 tssop-ep* pin configuration appears at end of data sheet. * exposed paddle. ordering information for free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. for small orders, phone 1-800-835-8769.
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +2.7v to +3.3v; shdn = v cc ; enx2 = gnd; v pc = 0.5v; no input ac signals applied to i+, i-, q+, q-, lo, drin. modout and drout = v cc, t a = -40? to +85?. typical values are at v cc. = +3v, t a = +25?, unless otherwise noted.) ac electrical characteristics (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +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 +6v enx2 , shdn , pc, i+, i-, q+, q-, lo, drin to gnd ........................................-0.3v to (v cc + 0.3v) enx2 , shdn continuous current.....................................?0ma pc continuous current.....................................................?0ma i+ to i-, q+ to q- ....................................................................?v modout, drout to gnd short-circuit duration .................10s continuous power dissipation (t a = +70?) 20-pin tssop-ep (derate 21.7mw/? above +70?) ......1.74w operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range ............................ -65? to +150? lead temperature (soldering 10s) ................................. +300? MAX2721 max2720 0.5v < v pc < 2.5v, shdn = gnd 0.5v < v pc < 2.5v max2720, drin = gnd MAX2721, drin = gnd shdn = gnd conditions 86 129 ma 77 119 v 2.7 3.3 supply voltage supply current 2.5 ? -5 5 pc input bias current ? -1 1 logic input bias current v 0.5 logic input low voltage ma 59 86 supply current with pa driver disabled 67 96 ? 0.1 10 shutdown supply current v 2.0 logic input high voltage units min typ max parameter 100khz < f i = f q < 2mhz 100khz < f i+ = f q+ < 2mhz f i = f q < bw -1db f i = f q < bw -1db f i = f q < bw -3db , 0.5v < v pc < 2.5v f i = f q < bw -3db , 0.5v < v pc < 2.5v f i = f q < bw -1db conditions mhz 40 i/q input -3db bandwidth (note 2) mhz 14 20 i/q baseband inputs i/q input -1db bandwidth (note 2) ns 1 group delay mismatch ns 1 group delay ripple pf 5 i/q input capacitance ? 18 i/q input resistance mismatch mvp-p 200 630 i/q differential input level db ?.2 i/q gain imbalance degrees ?.0 i/q phase imbalance k ? 1.6 2.0 i/q input resistance units min typ max parameter
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver _______________________________________________________________________________________ 3 ac electrical characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) v pc = 2.5v MAX2721 enx2 = gnd MAX2721 max2720 enx2 = v cc v pc = 2.5v 0.5v < v pc < 2.5v v pc = 2.5v, i/q terminated in 50 ? slope between v pc = 1v and v pc = 2v dbm +8 +14 MAX2721, v pc = 2.5v, enx2 = v cc or gnd, t a = +25? (note 3) output third-order intercept point (note 4) max2720 conditions +3 +6 MAX2721 MAX2721 enx2 = gnd 30 40 enx2 = v cc 20 25 enx2 = gnd enx2 = v cc 24 31 enx2 = gnd enx2 = v cc max2720, 0.5v < v pc < 2.5v +9 +14 2:1 output vswr dbm/hz -141 -137 out-of-band noise density 26 33 max2720 MAX2721 v cc = +3.0v + 100mvp-p at 10khz/300khz max2720 0.5v < v pc < 2.5v 50 45 modout to lo input isolation 1.8:1 1.9:1 lo input vswr 2100 2500 max2720, v pc = 2.5v, enx2 = v cc or gnd, t a = +25? (note 3) mhz 1700 2100 2100 2500 1050 1250 1.8:1 frequency range (note 3) dbm +1 +5 output 1db compression point db/v 19 23 dbc pc slope v pc = 2.5v 41 v pc = 0.5v power-supply ripple rejection (note 5) dbm -12.5 -8.5 -6.0 output power, high max2720 -10.5 -5.0 -2.5 MAX2721 mhz units min typ max 850 1050 parameter lo frequency range (note 3) 1700 2100 28 35 1.6:1 modulator output dbc carrier suppression sideband suppression dbc db v pc = 2.5v, t a = -40? to +85? db ?.0 ?.8 output power variation over temperature ?.8 ?.5 max2720 MAX2721 max2720 MAX2721 dbm -16 -10 lo input power (note 3) v pc = 0.5v, enx2 = v cc or gnd db 29 35 power control range 28 32 max2720 MAX2721 lo buffer, lo frequency doubler, quadrature generator
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 4 _______________________________________________________________________________________ note 1: min/max limits are guaranteed by design and characterization and are not production tested. note 2: i/q input bandwith is determined by the baseband source impedance and the i/q input capacitance. the bandwith can be increased by lowering the baseband source impedance. note 3: modout output power specifications are met over this frequency range for v pc = 2.5v and t a = +25?. note 4 ip3 measured with two tones, f 1 = 500khz and f 2 = 600khz, at 100mvp-p each. note 5: measured relative to desired upconverted signal level. note 6 drout gain specifications are met over this frequency range at t a = +25?. note 7: ip3 measured with two tones, f 1 = 1900mhz and f 2 = 1901mhz, at -18dbm each. note 8: ip3 measured with two tones, f 1 = 2315mhz and f 2 = 2316mhz, at -18dbm each. conditions max2720 MAX2721 max2720 MAX2721 units min typ max parameter max2720 max2720 MAX2721 max2720 MAX2721 t a = -40? to +85? mhz 1700 2100 frequency range (note 6) dbm +9.5 +12.5 output 1db compression point 2.6 db 2.4 noise figure ?.3 ?.8 2100 2500 db 11 13.5 15.5 gain variation over temperature 8.5 11.5 15.5 ?.4 ?.8 MAX2721 (note 8) max2720 (note 7) MAX2721 db 19 reverse isolation +20 +24 db 65 drout to lo input isolation 1.5:1 input vswr 1.5:1 output vswr dbm +22 +24 output third-order intercept point +8 +11 ac electrical characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) gain (note 6) db pa driver
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver _______________________________________________________________________________________ 5 0 30 20 10 40 50 60 70 80 90 100 2.7 2.9 2.8 3.0 3.1 3.2 3.3 supply current vs. supply voltage with pa driver enabled max2720/21toc01 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = -40 c enx2 = gnd enx2 = v cc 0 30 20 10 40 50 60 70 80 90 100 2.7 2.9 2.8 3.0 3.1 3.2 3.3 supply current vs. supply voltage with pa driver disabled max2720/21toc02 supply voltage (v) supply current (ma) enx2 = gnd enx2 = v cc drin = gnd t a = +85 c t a = +25 c t a = -40 c -60 -50 -40 -30 -20 -10 0 1700 1800 1900 2000 2100 modulator output power vs. rf frequency max2720/21toc04 rf frequency (mhz) output power (dbm) t a = +85 c v pc = 2.5v v pc = 1.5v v pc = 0.5v t a = +25 c t a = -40 c -60 -40 -50 -20 -30 -10 0 -19 -13 -11 -17 -15 -9 -7 -5 max2720/21toc05 lo power (dbm) output power (dbm) and carrier and sideband suppression (dbc) output power carrier suppression sideband suppression modulator performance vs. lo power (enx2 = gnd) -70 -50 -60 -20 -30 -40 -10 0 -19 -13 -11 -17 -15 -9 -7 -5 max2720/21toc06 lo power (dbm) output power (dbm) and carrier and sideband suppression (dbc) output power modulator performance vs. lo power (enx2 = v cc ) carrier suppression sideband suppression typical operating characteristics (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) max2720
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 6 _______________________________________________________________________________________ -50 -35 -40 -45 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc10 pc voltage (v) output power (dbm) modulator output power vs. pc voltage (enx2 = v cc ) 2.1ghz 1.9ghz 1.7ghz -70 -50 -60 -40 -10 -20 -30 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc11 pc voltage (v) carrier suppression (dbc) modulator carrier suppression vs. pc voltage (enx2 = v cc ) 2.1ghz 1.9ghz 1.7ghz -50 -35 -40 -45 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc12 pc voltage (v) sideband suppression (dbc) modulator sideband suppression vs. pc voltage (enx2 = v cc ) 2.1ghz 1.7ghz 1.9ghz typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) -40 -35 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc08 pc voltage (v) carrier suppression (dbc) modulator carrier suppression vs. pc voltage (enx2 = gnd) 2.1ghz 1.9ghz 1.7ghz -60 -40 -50 -20 -30 -10 0 0 1.0 1.5 0.5 2.0 2.5 3.0 max2720/21toc09 pc voltage (v) sideband suppression (dbc) modulation sideband suppression vs. pc voltage (enx2 = gnd) 2.1ghz 1.9ghz 1.7ghz max2720 -50 -35 -40 -45 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc07 pc voltage (v) output power (dbm) 1.9ghz 1.7ghz 2.1ghz modulator output power vs. pc voltage (enx2 = gnd)
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver _______________________________________________________________________________________ 7 typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) -35 -40 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc14 pc voltage (v) carrier suppression (dbc) modulator carrier suppression vs. pc voltage (enx2 = gnd) t a = +85 c t a = +25 c t a = -40 c -55 -60 -20 -30 -40 -10 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc15 pc voltage (v) sideband suppression (dbc) modulator sideband suppression vs. pc voltage (enx2 = gnd) t a = +85 c t a = +25 c t a = -40 c -45 -40 -50 -15 -20 -25 -35 -30 -5 -10 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc16 pc voltage (v) output power (dbm) modulator output power vs. pc voltage (enx2 = v cc ) t a = +85 c t a = +25 c t a = -40 c -40 -70 -50 -60 -20 -30 -10 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc17 pc voltage (v) carrier supression (dbc) modulator carrier suppression vs. pc voltage (enx2 = v cc ) t a = +85 c t a = +25 c t a = -40 c -40 -50 -60 -20 -30 -10 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc18 pc voltage (v) sideband supression (dbc) t a = +85 c t a = -40 c modulator sideband suppression vs. pc voltage (enx2 = v cc ) t a = +25 c max2720 -50 -35 -40 -45 -15 -10 -20 -30 -25 -5 0 0 1.5 0.5 1.0 2.0 2.5 3.0 max2720/21toc13 pc voltage (v) output power (dbm) t a = +85 c t a = +25 c t a = -40 c modulator output power vs. pc voltage (enx2 = gnd)
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 8 _______________________________________________________________________________________ -60 10 10,000 1000 100 modulator output power vs. input level (t a = +25 c) 10 -30 -40 -50 0 -10 -20 max2720 toc20 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 2.0v v pc = 1.5v v pc = 1.0v v pc = 0.5v -60 10 10,000 1000 100 modulator output power vs. input level (t a = +85?) 10 -30 -40 -50 0 -10 -20 max2720 toc21 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 2.0v v pc = 1.5v v pc = 1.0v v pc = 0.5v -20 -15 -30 -25 15 10 0 -5 -10 5 20 25 1.0 0 0.5 1.5 2.0 2.5 3.0 modulator output ip3 vs. pc voltage max2720/21toc22 pc voltage (v) output ip3 (dbm) t a = +25 c t a = -40 c t a = +85 c 1.0 1.2 1.6 2.0 2.4 2.8 850 890 930 970 1010 1050 max2720-24 frequency (mhz) vswr lo port vswr vs. lo frequency (enx2 = gnd) 1.0 1.4 1.8 2.0 2.4 2.8 1700 1780 1860 1940 2020 2100 max2720-25 frequency (mhz) vswr lo port vswr vs. lo frequency (enx2 = v cc ) typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) max2720 -60 10 10,000 1000 100 modulator output power vs. input level (t a = -40 c) 10 -30 -40 -50 0 -10 -20 max2720 toc19 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 2.0v v pc = 1.5v v pc = 1.0v v pc = 0.5v
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver _______________________________________________________________________________________ 9 10 11 12 13 14 15 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver gain vs. supply voltage max2720/21toc27 supply voltage (v) gain (db) t a = +85 c t a = +25 c t a = -40 c 20 22 21 23 24 26 25 28 27 29 30 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver output ip3 vs. supply voltage max2720/21toc28 supply voltage (v) output ip3 (dbm) t a = +85 c t a = +25 c t a = -40 c page 1 10 12 11 13 14 16 15 18 17 19 20 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver output p1db vs. supply voltage max2720/21toc29 supply voltage (v) output p1db (dbm) t a = +85 c t a = +25 c t a = -40 c 0 4 2 6 8 12 10 16 14 18 20 1700 1800 1900 2000 2100 pa driver gain vs. rf frequency max2720/21toc30 rf frequency (mhz) gain (db) t a = +25 c t a = +85 c t a = -40 c typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) 20 22 21 23 24 26 25 28 27 29 30 1700 1800 1900 2000 2100 pa driver output ip3 vs. frequency max2720/21toc31 frequency (mhz) output ip3 (dbm) t a = +25 c t a = +85 c t a = -40 c 10 12 11 13 14 16 15 18 17 19 20 1700 1800 1900 2000 2100 pa driver output p1db compression point vs. frequency max2720/21toc32 frequency (mhz) output p1db (dbm) t a = +25 c t a = -40 c t a = +85 c max2720
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 10 ______________________________________________________________________________________ typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) 0 1.0 0.5 1.5 2.0 3.0 2.5 4.0 3.5 4.5 5.0 1700 1800 1900 2000 2100 pa driver noise figure vs. frequency max2720/21toc33 frequency (mhz) noise figure (db) t a = +25 c t a = +85 c t a = -40 c -15 -10 -5 10 5 0 15 20 -25 -15 -10 -20 -5 5 01020 15 pa driver output power vs. input power max2720/21toc34 input power (dbm) output power (dbm) t a = -40 c t a = +85 c t a = +25 c max2720
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 11 -50 -40 -45 -30 -35 -20 -25 -15 -5 -10 0 2100 2200 2300 2400 2500 modulator output power vs. rf frequency max2720 toc38 rf frequency (mhz) output power (dbm) v pc = 2.5v v pc = 1.5v v pc = 0.5v t a = +85 c t a = +25 c t a = -40 c -40 -30 -35 -25 -20 -5 -15 -10 0 -19 -17 -15 -13 -11 -9 -7 -5 modulator performance vs. lo power (enx2 = gnd) max2720/21toc39 rf frequency (mhz) output power (dbm) and carrier and sideband suppression (dbc) output power carrier suppression sideband suppression -40 -30 -35 -25 -20 -15 -5 -10 0 -19 -17 -15 -13 -9 -7 -11 -5 modulator performance vs. lo power (enx2 = v cc ) max2720/21toc40 lo power (dbm) output power (dbm) and carrier and sideband suppression (dbc) output power carrier suppression sideband suppression 20 30 50 40 70 60 110 100 90 80 120 2.7 2.9 2.8 3.0 3.1 3.2 3.3 supply current vs. supply voltage with pa driver enabled max2720/21toc35 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = -40 c enx2 = gnd enx2 = v cc 20 40 30 60 50 100 90 80 70 120 110 2.7 2.9 2.8 3.0 3.1 3.2 3.3 supply current vs. supply voltage with pa driver disabled max2720/21toc36 supply voltage (v) supply current (ma) t a = +25 c t a = -40 c t a = +85 c drin = gnd enx2 = gnd enx2 = v cc typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) MAX2721
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 12 ______________________________________________________________________________________ typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator sideband supression vs. pc voltage (enx2 = v cc ) MAX2721 toc46 pc voltage (v) sideband supression (dbc) 2.1ghz 2.5ghz 2.3ghz -45 -35 -40 -20 -25 -30 -5 -10 -15 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator output power vs. pc voltage (enx2 = v cc ) MAX2721 toc44 pc voltage (v) output power (dbm) 2.1 ghz 2.3 ghz 2.5 ghz -45 -35 -40 -20 -25 -30 -5 -10 -15 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator carrier supression vs. pc voltage (enx2 = v cc ) MAX2721 toc45 pc voltage (v) carrier supression (dbc) 2.1ghz 2.3ghz 2.5ghz -40 -30 -35 -25 -20 -15 -5 -10 0 0 0.5 1.0 2.0 2.5 1.5 3.0 max2720/21toc42 pc voltage (v) carrier suppression (dbm) carrier suppression vs. pc voltage (enx2 = gnd) 2.5ghz 2.1ghz 2.3ghz -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 sideband supression vs. pc voltage (enx2 = gnd) MAX2721 toc43 pc voltage (v) sideband supression (dbc) 2.3ghz 2.1ghz 2.5ghz MAX2721 -40 -30 -35 -25 -20 -15 -5 -10 0 0 0.5 1.0 1.5 2.0 3.0 2.5 max2720/21toc41 pc voltage (v) output power (dbm) modulator output power vs. pc voltage (enx2 = gnd) 2.3ghz 2.1ghz 2.5ghz
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 13 typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator output power vs. pc voltage (enx2 = gnd) MAX2721 toc47 pc voltage (v) output power (dbm) t a = +25 c t a = -40 c t a = +85 c -35 -25 -30 -15 -20 -5 -10 0 0 1.0 1.5 0.5 2.0 2.5 3.0 modulator carrier supression vs. pc voltage (enx2 = gnd) MAX2721 toc48 pc voltage (v) carrier supression (dbc) t a = +85 c t a = +25 c t a = -40 c -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator sideband supression vs. pc voltage (enx2 = gnd) MAX2721 toc49 pc voltage (v) sideband supression (dbc) t a = -40 c t a = +25 c t a = +85 c -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator output power vs. pc voltage (enx2 = v cc ) MAX2721 toc450 pc voltage (v) output power (dbm) t a = -40 c t a = +85 c t a = +25 c -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator carrier supression vs. pc voltage (enx2) = v cc MAX2721 toc51 pc voltage (v) carrier suppression (dbc) t a = -40 c t a = +25 c t a = +85 c -40 -35 -30 -25 -20 -15 -10 -5 0 0 1.0 0.5 1.5 2.0 2.5 3.0 modulator sideband suppression vs. pc voltage (enx2 = v cc ) MAX2721 toc52 pc voltage (v) sideband suppression (dbc) t a = -40 c t a = +85 c t a = +25 c MAX2721
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 14 ______________________________________________________________________________________ -60 -50 -40 -30 -20 -10 0 10 20 10 1000 100 10,000 modulator output power vs. input level (t a = +85 c) MAX2721 toc55 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 1.5v v pc = 2.0v v pc = 1.0v v pc = 0.5v -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 0 0.5 1.0 1.5 2.0 2.5 3.0 modulator output ip3 vs. pc voltage MAX2721 toc56 input level (mvp-p) output ip3 (dbm) t a = -40 c t a = +85 c t a = +25 c -20 -15 -10 -25 15 10 -5 0 5 20 25 1.5 0.5 1.0 2.0 2.5 modulator output p1db compression point vs. pc voltage max2720/21toc57 pc voltage (v) output p1db (dbm) t a = +85 c t a = +25 c t a = -40 c 1.0 1.4 1.8 2.0 2.4 2.6 MAX2721toc58 2100 2180 2260 2340 2420 2500 lo port vswr vs. lo frequency (enx2 = v cc ) frequency (mhz) vswr -60 -50 -40 -30 -20 -10 0 10 20 10 1000 100 10,000 modulator output power vs. input level (t a = +25 c) MAX2721 toc54 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 1.5v v pc = 2.0v v pc = 1.0v v pc = 0.5v typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) MAX2721 -60 -50 -40 -30 -20 -10 0 10 20 10 1000 100 10,000 modulator output power vs. input level (t a = -40 c) MAX2721 toc53 input level (mvp-p) output power (dbm) v pc = 2.5v v pc = 1.5v v pc = 2.0v v pc = 1.0v v pc = 0.5v
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 15 8 10 9 11 12 14 13 16 15 17 18 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver output p1db vs. supply voltage max2720/21toc63 supply voltage (v) output p1db (dbm) t a = +85 c t a = +25 c t a = -40 c 1.0 1.4 1.6 1.8 2.0 MAX2721toc59 lo port vswr vs. frequency (enx2 = gnd) 1050 1090 1130 1170 frequency (mhz) 1210 1250 vswr 10 11 13 12 14 15 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver gain vs. supply voltage MAX2721 toc61 supply voltage (v) gain (db) t a = +25 c t a = -40 c t a = +85 c -2 2 0 4 6 10 8 14 12 16 18 2100 2200 2300 2400 2500 pa driver gain vs. rf frequency max2720/21toc64 rf frequency (mhz) gain (db) t a = +25 c t a = +85 c t a = -40 c 20 22 21 23 24 26 25 28 27 29 30 2.7 2.9 2.8 3.0 3.1 3.2 3.3 pa driver output ip3 vs. supply voltage max2720/21toc62 supply voltage (v) output ip3 (dbm) t a = +85 c t a = -40 c t a = +25 c typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) 20 22 21 23 24 26 25 28 27 29 2100 2200 2300 2400 2500 pa driver output ip3 vs. frequency max2720/21toc65 frequency (mhz) output ip3 (dbm) t a = +85 c t a = +25 c t a = -40 c MAX2721
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 16 ______________________________________________________________________________________ 0 2 1 3 4 6 5 8 7 9 10 2100 2200 2300 2400 2500 pa driver noise figure vs. frequency max2720/21toc67 frequency (mhz) noise figure (db) t a = +25 c t a = -40 c t a = +85 c -15 -10 5 10 15 2.0 -25 -15 -10 -20 -5 -5 01020 15 pa driver output power vs. input power max2720/21toc68 input power (dbm) output power (dbm) t a = -40 c t a = +85 c t a = +25 c typical operating characteristics (continued) (max2720/MAX2721 ev kit, v cc = +3.0v, shdn = v cc , enx2 = gnd, v pc = 2.5v, input i/q signals driven in quadrature, from a 1k ? source impedance, single-ended, f i+ = f q+ = 500khz, v i+ = v q+ = 200mvp-p, p lo = -13dbm, f lo = 950mhz (max2720), f lo = 1157.5mhz (MAX2721), p drin = -12dbm, f drin = 1900mhz (max2720), f drin = 2315mhz (MAX2721), modout and drout ports are matched to a 50 ? load, t a = +25?, unless otherwise noted.) (note 1) MAX2721 0 4 2 6 8 12 10 16 14 18 20 2100 2200 2300 2400 2500 pa driver output p1db vs. frequency max2720/21toc66 frequency (mhz) output p1db (dbm) t a = +25 c t a = +85 c t a = -40 c
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 17 detailed description the max2720/MAX2721 upconvert in-phase (i) and quadrature (q) baseband signals directly to rf frequencies of 1700mhz to 2100mhz (max2720) or 2100mhz to 2500mhz (MAX2721). they are designed for wideband-cdma and wll systems where direct i/q modulation of the rf carrier reduces system cost, com- ponent count, and board space compared to dual-conversion architectures. internally, the max2720/MAX2721 include an i/q mod- ulator, a variable gain amplifier (vga), and a pa driver. separate modulator output and pa driver input ports allow insertion of a bandpass filter between the modulator and pa driver for increased noise rejection. disable the stand-alone pa driver to reduce current consumption. a low-power shutdown mode further reduces current consumption to less than 0.1?. additionally, a logic- level control disables or enables an internal frequency doubler that allows the external lo to run at full or half frequency. name function 1, 5, 10, 19, ep gnd ground. connect to ground plane with lowest inductance path. solder exposed paddle evenly to the board ground plane. 2 drout pa driver open-collector output port. requires an external matching network and a pull- up inductor to v cc for proper biasing. see typical application circuit for recommended component values. pin 3 shdn shutdown control input. drive with a logic-level high to enable the device. drive with a logic- level low to disable the device. bypass with a 1000pf capacitor to ground, as close to the pin as possible to minimize the amount of external noise coupled onto the control line. 4, 6, 9, 12, 15 v cc supply voltage input. bypass to ground with the specified capacitor as close to the pin as possible. (see typical application circuit .) 16 enx2 logic-level enable input for lo doubler. drive with a logic-level low to enable the doubler, allowing the external lo to run at half-frequency, f lo = f out / 2. drive with a logic-level high to disable the doubler, and allow the external lo to run at full-frequency, f lo = f out . bypass with a 1000pf capacitor to ground as close to the pin as possible to minimize noise coupled into the control line. 13, 14 q+, q- quadrature differential input ports. requires dc-blocking capacitors. see typical application circuit for recommended component values. 11 lo local oscillator input. internally matched to 50 ? over the operating frequency band. requires a dc-blocking capacitor. see typical application circuit for recommended com- ponent values. 7, 8 i-, i+ in-phase differential input ports. requires dc-blocking capacitors. see typical application circuit for recommended component values. 20 drin pa driver amplifier input port. requires an external matching network and a dc-blocking capacitor that can be part of the matching network. see typical application circuit for rec- ommended component values. connect to ground to disable the pa driver and reduce supply current. 18 pc modulator power control input. apply a voltage between 0.5v to 2.5v to vary the output power of the i/q modulator over a 30db range. bypass with a 1000pf capacitor to ground as close to the pin as possible to minimize noise on the control line. 17 modout modulator open-collector output port. requires an external matching network and a pull- up inductor to v cc for proper biasing. see typical application circuit for recommended component values. pin description
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 18 ______________________________________________________________________________________ i/q modulator the max2720/MAX2721 modulator is composed of a pair of matched double-balanced mixers, an active lo quad- rature generator, and a summing amplifier. the pair of mixers accept differential i/q baseband signals that directly modulate the internal 0 and 90 lo signals applied to the i/q mixers. an external lo source drives an internal lo quadrature generator that shifts the phase of the lo signal applied to the q mixer by 90 relative to the lo signal applied to the i channel mixer. the modu- lated output of the i/q mixers is summed together, and the undesired sideband is suppressed. the i+, i-, q+, and q- input ports feature high-linearity buffer amplifiers with a -1db bandwidth of 20mhz and a -3db bandwidth of 38mhz (1k ? i/q source imped- ance), and accept differential input voltages up to 630mvp-p. input bandwith can be extended to beyond 100mhz by lowering the i/q source impedance. the ports are internally biased and therefore require dc- blocking capacitors. for single-ended operation, bypass the i- and q- ports with a capacitor to ground equal in value to the dc-blocking capacitors used on the i+ and q+ ports. see the typical application circuit for recommended component values. variable gain amplifier (vga) a vga follows the summing amplifier of the i/q modulator. apply a voltage between 0.5v and 2.5v to pc to vary the output power of the modulator over a 32db span. the open-collector modout output requires a pull-up inductor to v cc for proper biasing, an external matching network for optimum power transfer, and a dc-blocking capacitor. since the max2720/MAX2721 are optimized for different frequency ranges, they require different output matching networks. see the max2720 and MAX2721 typical application circuit for recommended component values. see table 1 for matching to other frequencies. lo buffer and lo frequency doubler the max2720/MAX2721 feature an internal lo frequency doubler that allows the external lo source to run at full or half frequency (table 2). operating the lo at half fre- quency reduces injection-pulling of the voltage-con- trolled oscillator (vco) from the pa, and reduces the complexity of designing a high-frequency vco. an internal two-pole bandpass filter is integrated before the lo phase-shift network to help reduce lo harmonic content and spurious mixing. to enable the lo frequency doubler, drive enx2 to a logic-level low and operate the external lo source at half the rf carrier frequency. to disable the lo frequency doubler, drive enx2 to a logic-level high and run the external lo source at the rf carrier frequency. see table 2 for lo input frequency ranges. the lo port is a single-ended input that achieves a vswr of better than 2:1 over the specified lo input frequency range. since the port is internally terminated with 50 ? , it requires a dc-blocking capacitor. see the typical applications circuits for recommended compo- nent values. for optimum performance, drive the lo port with an input power of -16dbm to -10dbm. driving the lo port with lower input power levels may affect quadrature performance, while higher input powers may increase lo leakage. pa driver amplifier the pa driver provides a gain of 13.5db for the max2720 and 11.5db for the MAX2721. the drin input port requires an external matching network and a -71.0 -68.9 -93.8 0.832 0.896 -91.3 -66.6 0.861 s22 phase (degrees) 0.909 1750 1800 -77.1 75.4 -97.1 0.866 0.878 -94.8 -74.6 0.834 -73.0 0.868 1950 2000 -94.7 0.807 0.871 -94.4 0.811 0.884 1850 1900 -86.5 0.861 0.914 s22 phase (degrees) s22 mag s22 mag frequency (mhz) 1700 2200 2150 2100 frequency (mhz) 2400 2350 2300 2250 table 1. vga modout s22 parameters (v cc = 3.0v, v pc = 2.5v, t a = +25?) 82.5 -79.6 -104.5 0.905 0.897 -100.5 0.891 0.892 2050 2100 2500 2450 max2720 MAX2721
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 19 dc-blocking capacitor that can be part of the matching network. the drout open-collector output port requires an external matching network and a pull-up inductor to v cc for proper biasing. the pull-up inductor is incorporated as part of the matching network. see the max2720 and MAX2721 typical application circuit for recommended component values. refer to table 3 for matching to other frequencies. if the additional gain of the pa driver is not required, disable the pa driver to reduce current consumption. to disable the pa driver, short pin 20 (drin) to ground and leave pin 2 unconnected. shutdown apply a logic-level high to the shdn pin to enable the max2720/MAX2721. apply a logic-level low voltage to disable the device and reduce supply current to less than 0.1?. applications information layout considerations a properly designed pc board is an essential part of any rf circuit. a ground plane is essential. keep rf signal lines as short as possible to reduce losses, radi- ation, and inductance. use separate, low-inductance vias to the ground plane for each pin. for best perfor- mance, solder the exposed pad on the bottom of the device package evenly to the board ground plane. remove the ground plane under the external vco and lowpass filters to reduce the effects of parasitic capaci- tance. in direct i/q modulator applications, radiated power from the pa can couple into the vco tank. to reduce pa injection-pulling, the external vco should be housed in a separate shielded compartment if possible. power-supply, logic, and pc input bypassing proper voltage supply bypassing is essential for high-fre- quency circuit stability. with the exception of pin 6, bypass all v cc pins with a 470pf capacitor as close to the v cc pins as possible. the decoupling capacitor for pin 6 also serves as part of an on-chip matching network, so it should be chosen to resonate out series inductance on the board. some empirical adjustment may yield increased output power. see the max2720/MAX2721 typical application circuit for suggested values. bypass the enx2 , shdn, and pc inputs with a 1000pf capacitor to ground to minimize noise injected into the device. use a series resistor (10k ? typ) to further reduce coupling of high-frequency signals into the device. voltage supply layout is also critical to achieve optimum performance. the ic has several rf processing stages that use the various v cc pins, and while they have on-chip decoupling, off-chip interaction between them may degrade gain, linearity, carrier suppression, and output power control range. the supplies associated with pins 2, 6, 15 (MAX2721 only), and 17 lie directly in the rf signal path. pins 4, 12, and 15 carry lo signal currents, so it is important to keep them from interacting with the rf signal path to prevent poor carrier suppres- sion. the vga generates discarded signal currents on pin 4, which also need to be kept away from the signal path supplies. because there is a great deal of gain following from the first rf stage, it is also important to prevent coupling from pins 2, 4, 15, and 17 to pin 6; excessive coupling may degrade stability. 2100 to 2500 1050 to 1250 1700 to 2100 MAX2721 850 to 1050 low high max2720 lo input frequency range (mhz) enx2 logic level table 2. lo input frequency range
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 20 ______________________________________________________________________________________ table 3. pa driver s-parameters (v cc = 3.0v, t a = +25?) 0.125 0.110 0.117 0.118 0.123 0.106 0.106 2.848 3.176 3.087 3.013 2.929 3.360 3.268 -97.8 -133.9 -153.1 -141.0 -144.9 -142.7 47.0 2500 0.425 40.9 0.015 130.3 -138.9 80.4 71.7 63.5 55.4 96.2 2350 2300 0.456 75.9 0.051 0.462 67.9 0.042 87.4 2450 2400 0.447 135.8 59.7 135.3 0.031 0.437 51.6 0.026 132.9 132.2 2250 2200 0.475 88.0 0.055 0.473 84.2 0.046 139.0 136.9 0.102 3.492 -138.0 104.2 2150 0.470 97.2 0.066 141.3 0.100 frequency (mhz) s11 mag s21 phase s22 mag 0.105 0.093 0.093 0.091 0.096 s12 mag 0.092 0.097 3.690 3.567 4.370 4.160 3.946 3.801 s21 mag 4.708 4.389 s22 phase -120.3 -128.8 -109.2 -118.4 -100.8 -111.0 -82.4 120.4 112.3 2100 2050 0.440 112.8 0.083 0.452 104.9 0.082 142.8 -99.5 153.5 144.3 135.2 128.4 s21 phase 178.1 142.9 1900 1850 0.418 138.2 0.123 0.449 129.7 0.095 161.7 2000 1950 0.421 149.4 128.7 145.3 0.082 0.425 121.2 0.091 140.1 142.8 1800 1700 0.321 s11 phase 164.7 0.162 0.383 147.2 0.142 151.6 152.0 0.094 4.588 -90.3 171.5 1750 0.347 154.2 0.158 152.7
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 21 typical application circuit 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 12 11 9 10 v cc drout gnd i+ i- v cc gnd gnd v cc shdn drin gnd pc modout v cc q- q+ v cc lo enx2 max2720 MAX2721 0.1 f v cc 470pf 0.1 f 8pf (5pf*) v cc 470pf v cc 1000pf 100k 2.0pf 470pf 3.9nh v cc pa driver output pa driver input shutdown control lo doubler enable vga power control i modulation q modulation lo input 47pf v cc 470pf 0.1 f 3pf 0.1 f 470pf v cc 1.0pf (27pf*) 470pf 1.5nh (1.2nh*) 0nh (3.3nh*) v cc modout output 10k 1000pf 100k 1000pf *component value for MAX2721 0nly.
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 22 ______________________________________________________________________________________ chip information transistor count: 1041 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 drin gnd pc modout v cc drout gnd top view v cc q- q+ i+ i- v cc gnd 12 11 9 10 v cc lo gnd v cc max2720 MAX2721 tssop-ep shdn enx2 pin configuration
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver ______________________________________________________________________________________ 23 package information tssop.eps
max2720/MAX2721 1.7ghz to 2.5ghz, direct i/q modulator with vga and pa driver 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. 24 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2000 maxim integrated products printed usa is a registered trademark of maxim integrated products. 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. 24 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2000 maxim integrated products printed usa is a registered trademark of maxim integrated products. notes

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