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general description the max2900?ax2904 complete single-chip 200mw transmitters are designed for use in the 868mhz/ 915mhz frequency bands. the max2900/max2901/ max2902 are compliant with the fcc cfr47 part 15.247 902mhz to 928mhz ism-band specifications. max2903/ max2904 are compliant with the etsi en330-220 speci- fication for the european 868mhz ism band. these transmitter ics offer a high level of integration while minimizing the number of external components. this is achieved by full integration of the transmit modu- lator, power amplifier, rf vco, 8-channel frequency syn- thesizer, and baseband pn sequence lowpass filter. by filtering the bpsk modulation, the spurious emissions are reduced, enabling up to eight independent transmit channels in the u.s. ism band. inputs are provided for spread-spectrum bpsk, ask, and ook. fm can be achieved by directly modulating the vco. the devices are intended primarily for use with an external differential antenna. applications automatic meter reading wireless security systems/alarms wireless sensors wireless data networks wireless building control features versions for u.s. 902mhz to 928mhz band and european 868mhz band -7dbm to +23dbm adjustable differential rf output power +23dbm output power at 4.5v, +20dbm output power at 3.0v support bpsk, ook, ask, and fm modulations modulation filter for direct sequence bpsk up to 8mchips/s fully integrated vco with on-chip tank extremely low frequency pulling for ook modulation (typ 60khz peak, 5khz rms) integrated frequency synthesizer for up to 8 channels (max2900) +2.7v to +4.5v supply operation small 28-pin qfn package with exposed pad (5mm ? 5mm) max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands ________________________________________________________________ maxim integrated products 1 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf vcc1 vreg gnd vtune gnd rf- rf+ gnd divout vco- vco+ osc refin vcc4 refout div63 vcc5 cpout vcc3 pwrset ld vask vcc2 ookin modin dual- channel (/62 or /63) synthesizer cp gate reg max2901/ max2903 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf vcc1 vreg gnd vtune gnd rf- rf+ n.c. n.c. d1 d0 osc refin vcc4 refout d2 vcc5 cpout vcc3 pwrset ld vask vcc2 ookin modin 8-channel synthesizer cp gate reg 4 max2900 functional diagrams/pin configurations 19-2145; rev 1; 8/03 ordering information * exposed pad part temp range pin-package max2900 egi -40 c to +85 c 28 qfn-ep* max2901 egi -40 c to +85 c 28 qfn-ep* max2902 egi -40 c to +85 c 28 qfn-ep* max2903 egi -40 c to +85 c 28 qfn-ep* max2904 egi -40 c to +85 c 28 qfn-ep* functional diagrams/pin configurations are continued at end of data sheet. 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.
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +2.7v to +4.5v, en = ookin = refen = high, t a = -40 c to +85 c. typical values are at v cc = +4.5v, t a = +25 c, 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 +5.0v analog/digital input voltage to gnd..........-0.3v to (v cc + 0.3v) analog/digital input current ..............................................10a continuous power dissipation (t a = +70 c) 28-pin qfn-ep (derate 28.5mw/ c above +70 c)............2w 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 conditions min -3 typ +3 max units supply voltage 2.7 4.5 4.5 v v cc = +4.0v 0.7 10 shutdown mode: en = refen = low v cc = +4.5v 60 200 a synth mode: ookin = low (max2900/max2901/max2903 only) 32 40 transmit mode with output matching optimized for +23dbm at +4.5v: pwrset loaded with 22k ? resistor t a = -40 c to +85 c 150 200 supply current transmit mode with output matching optimized for +20dbm at +3.0v: pwrset loaded with 22k ? resistor t a = -40 c to +85 c 110 135 ma five different versions are available. the versions differ by their frequency band of operation, and by the synthe- sizer s mode of operation. the max2900 has an internal 8-channel synthesizer. the max2901 and max2903 are dual-channel versions with a selectable internal synthesizer division ratio of 62 or 63. the max2901 operates in the 902mhz to 928mhz ism band and the max2903 operates in the 867mhz to 870mhz european ism band. the max2902 and max2904 require an off-chip fre- quency synthesizer. the max2902 operates in the 902mhz 928mhz ism band and max2904 operates in the 867mhz 870mhz european ism band. the max2901 max2904 provide lo outputs to drive a receiver and/or an external synthesizer. part frequency range (mhz) synthesizer lo outputs max2900egi 902 to 928 internal 8 selectable channels no max2901egi 902 to 928 internal 2 selectable channels yes max2902egi 902 to 928 off-chip yes max2903egi 867 to 870 internal 2 selectable channels yes max2904egi 867 to 870 off-chip yes part selection information caution! esd sensitive device
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands _______________________________________________________________________________________ 3 dc electrical characteristics (continued) (v cc = +2.7v to +4.5v, en = ookin = refen = high, t a = -40 c to +85 c. typical values are at v cc = +4.5v, t a = +25 c, unless otherwise noted.) (note 1) parameter conditions min -3 typ +3 max units transmit mode with output matching optimized for +17dbm at +3.0v: pwrset loaded with 36k ? resistor t a = +25 c75 transmit mode with output matching optimized for +14dbm at +3.0v: pwrset loaded with 51k ? resistor t a = +25 c57 reference-only mode: en = low 2 3 supply current (continued) pa standby mode: ookin = low (max2902/max2904 only) 29 33 ma vco input tuning pin current vtune = +4.5v, t a = +25 c 0.02 2 a vreg vco regulator voltage 2.0 v d ig it a l in pu t /o u t pu t s ( p in s e n , re fe n , d 0, d 1, d 2, m o d in , o okin , ld ) input level high v cc - 0.5v v input level low 0.5 v input bias current -10 10 a output level high v cc - 0.4 v output level low 0.4 v output current -100 100 a analog control inputs (pins pwrset, rlpf, vask) pwrset voltage 1.2 v rlpf voltage 1.2 v vask in p ut im p edance 100 220 400 k ?
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 4 _______________________________________________________________________________________ ac electrical characteristics (max290_ ev kits. v cc = +2.7v to +4.5v, r rlpf = 68k ? , r pwrset = 22k ? , f rf = 917.28mhz (max2900/max2901/max2902) or f rf = 868mhz (max2903/max2904), vask = vreg, f ref = 14.56mhz (max2900/max2901/max2902) or f ref = 13.62mhz (max2903/max2904), chip rate on modin = 1.22mbps, p out = +23dbm, t a = -40 c to +85 c. typical values are at v cc = +4.5v, t a = +25 c, unless otherwise noted.) (note 1) parameter conditions min -3 typ +3 max u n i t s analog input pins vtune input capacitance vtune = +1.35v 15 p f digital input pins digital input pin capacitance 3 p f vco and synthesizers section (max2900/max2901/max2902) 902 917.28 928 rfout frequency range (max2903/max2904) 867 868 870 m h z (max2900/max2901/max2902) 14 14.56 15 refin reference frequency range (max2903/max2904) 13 13.78 14.5 m h z refdiv fixed reference divider ratio (max2900) 4 4 4 table 4 (max2900) 249 256 main divider ratios (max2901/max2903) 62 63 (max2900) 3.5 3.64 3.75 pll comparison frequency (max2901/max2903) 13 15 m h z vco buffer output power 300 ? differential load (max2901 max2904) -12 d bm refdiv fixed reference divider ratio (max2901/max2903) 1 1 1 vco phase noise at 100khz offset, measured at rfout, pll loop bw = 5khz -101 d bc/h z vco tuning gain vtune = +1.35v 44 65 86 m h z/v 5kh z rm s vco frequency pulling with ook modulation ookin clocked at 19khz, internal (crystal) or external reference frequency 60 kh z p eak pll phase noise measured at rfout, 5khz offset, pll loop bw = 50khz -96 d bc/h z refout voltage swing 100 m v p - p cpout charge pump current 500 a reference spurs -62 d bc reference input voltage for nominal operation using an external frequency reference 200 300 m v bpsk, ook modulator, and pa modin frequency range 1.2 8 m b /s modulation filter nominal 3db bandwidth 1m h z modulation filter final attenuation measured at 30mhz 28 41 d b carrier suppression 28 d b noise power density at 960mhz (measured at rfout at +23dbm output power) -150 d bc/h z
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands _______________________________________________________________________________________ 5 ac electrical characteristics (continued) (max290_ ev kits. v cc = +2.7v to +4.5v, r rlpf = 68k ? , r pwrset = 22k ? , f rf = 917.28mhz (max2900/max2901/max2902) or f rf = 868mhz (max2903/max2904), vask = vreg, f ref = 14.56mhz (max2900/max2901/max2902) or f ref = 13.62mhz (max2903/max2904), chip rate on modin = 1.22mbps, p out = +23dbm, t a = -40 c to +85 c. typical values are at v cc = +4.5v, t a = +25 c, unless otherwise noted.) (note 1) parameter conditions min -3 typ +3 max u n i t s pwrset = 22k ? , v cc = +4.5v, t a = +25 c 21 23.5 25 pwrset = 22k ? , v cc = +4.5v, t a = -40 c to +85 c 20.5 25 rf output power p wrs e t = 22k ? , v c c = + 3.0v , t a = + 25 c 18 20 21 d bm f rf = 900mhz to 930mhz (max2900/max2901/max2902) 0.3 rf output power flatness f rf = 867mhz to 870mhz 0.1 d b adjacent channel power ratio pn sequence at 1.22mhz -17 d bc alternate channel power ratio pn sequence at 1.22mhz -26 d bc ook control range 40 80 d b ookin = high, vask = 0 41 ask output power adjustment range ask output power back- off relative to max power ookin = high, vask = 1v 16 d b rfout rise and fall time square-wave signal applied on ook 1 s at 2nd harmonic of rf output frequency with external matching network -50 at 3rd harmonic of rf output frequency with external matching network -51 at 4th harmonic of rf output frequency with external matching network -63 out of 902mhz to 928mhz band other than harmonics with external matching network (max2900/max2901/max2902) < -70 spurious emissions out of 867mhz to 870mhz band other than harmonics with external matching network (max2903/max2904) < -70 d bc unlocked, out-of-band spurious output level any condition when synthesizer unlocked (pin ld low) < -50 d bm modulation off, measured at 960mhz, any gain setting (max2900/max2901/max2902) -126 -120 noise level out of band modulation off, measured at 900mhz, any gain setting (max2903/max2904) -126 -120 d bm /h z output vswr for guaranteed stability 2:1 m axi m um al l ow ab l e outp ut v s wr 2:1 note 1: devices are production tested at t a = +25 c and +85 c. min/max values are guaranteed by design and characterization over temperature and supply voltage.
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 6 _______________________________________________________________________________________ typical operating characteristics (max290_ ev kits. v cc = +4.5v, f rf = 917.28mhz (max2900/max2901/max2902) or f rf = 868mhz (max2903/max2904), r rlpf = 68k ? , r pwrset = 22k ?, vask = vreg, f ref = 14.56mhz (max2900/max2901/max2902) or f ref = 13.78mhz (max2903/max2904), chip rate on modin = 1.22 mbps, rf output matching network optimized for +23dbm, v cc = 4.5v, t a = +25 c, unless otherwise noted.) supply current vs. v cc max2900 toc01 v cc (v) supply current (ma) 4.0 3.5 3.0 90 100 110 120 130 140 150 160 80 2.5 4.5 t a = +85 c t a = +25 c t a = -40 c shutdown current vs. v cc max2900 toc02 v cc (v) shutdown current ( a) 4.0 3.5 3.0 1 10 100 0.1 2.5 4.5 t a = +85 c t a = +25 c t a = -40 c output power vs. v cc max2900 toc03 v cc (v) output power (dbm) 4.0 3.5 3.0 18 20 22 24 26 16 2.5 4.5 t a = +85 c t a = +25 c t a = -40 c vco phase noise at 917.28mhz max2900 toc04 -40dbc/hz -140dbc/hz frequency offset (mhz) vco supply pushing vs. v cc max2900 toc05 v cc (v) output frequency (mhz) 4.0 3.5 3.0 915.5 916.0 916.5 917.0 917.5 918.0 915.0 2.5 4.5 pll lock time max2900 toc06 100khz -100khz start 0s 20khz/div stop 30 s lowpass filter 3-db response vs. r rlpf max2900 toc07 r rlpf (k ? ) lowpass filter 3-db bandwidth (khz) 60 50 40 30 20 500 1000 1500 2000 2500 3000 3500 0 10 70 bpsk modulation output vs. time max2900 toc08 225deg -225deg 45deg/div start 0s stop 40 s rf power vs. frequency (max2900/max2901/max2902) max2900 toc09 frequency (mhz) rf power (dbm) 925 920 915 910 905 19 20 21 22 23 24 25 18 900 930 a b c e f d a: v cc = 4.5v, t a = -40 c b: v cc = 4.5v, t a = +25 c c: v cc = 4.5v, t a = +85 c d: v cc = 2.7v, t a = -40 c e: v cc = 2.7v, t a = +25 c f: v cc = 2.7v, t a = +85 c
typical operating characteristics (continued) (max290_ ev kits. v cc = +4.5v, f rf = 917.28mhz (max2900/max2901/max2902) or f rf = 868mhz (max2903/max2904), r rlpf = 68k ? , r pwrset = 22k ?, vask = vreg, f ref = 14.56mhz (max2900/max2901/max2902) or f ref = 13.78mhz (max2903/max2904), chip rate on modin = 1.22 mbps, rf output matching network optimized for +23dbm, v cc = 4.5v, t a = +25 c, unless otherwise noted.) max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands _______________________________________________________________________________________ 7 rf power vs. frequency (max2903/max2904) max2900 toc10 frequency (mhz) rf power (dbm) 872 868 864 13 14 15 16 17 12 860 876 v cc = +3.6v v cc = +3.0v v cc = +2.7v rf output matching optimized for +14dbm output at v cc = +3.0v output spectrum with 600khz square wave input at modin max2900 toc11 30dbm -70dbm 10db/div mkr 917.31mhz -16.33dbm center 917.28mhz span 20mhz output spectrum with pn sequence at 1.22mhz at modin max2900 toc12 30dbm -70dbm 10db/div mkr 917.35mhz 8.17dbm center 917.28mhz span 20mhz rf out rise and fall time transient with square ook max2900 toc13 0dbvp-p -100dbvp-p 10db/div t r t f start 46 s stop 86 s rf out rise and fall time transient with square ask max2900 toc14 22dbvp-p -78dbvp-p 10db/div t r t f start 45 s stop 85 s spurious level from dc to 7th harmonic max2900 toc15 mkr 910mhz 23.17dbm 30dbm -70dbm 10db/div start 0hz stop 7ghz spurious level between 50mhz from carrier frequency max2900 toc16 30dbm -70dbm 10db/div center 917.28mhz span 100mhz transmitter efficiency vs. r pwrset max2900 toc17 r pwrset (k ? ) transmitter efficiency (%) 38 34 30 26 22 18 15 20 25 30 35 40 45 10 14 a b c e f d a: v cc = 4.5v, t a = -40 c b: v cc = 4.5v, t a = +25 c c: v cc = 4.5v, t a = +85 c d: v cc = 2.7v, t a = -40 c e: v cc = 2.7v, t a = +25 c f: v cc = 2.7v, t a = +85 c
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 8 _______________________________________________________________________________________ pin description pin max2900 max2901 max2903 max2902 max2904 name pin type function 1 1 1 vtune analog input vco tuning voltage input 2 2 2 gnd supply pin ground 3 3 3 vreg analog input/output regulated voltage output to supply the vco. bypass with a 0.01f capacitor to gnd as close to the part as possible. 4 4 4 vcc1 supply pin power supply pin for vco circuits. bypass with a 1000pf and a 10f capacitor to gnd as close to the part as possible. 5 5 5 rlpf analog input resistor to ground resistor to ground on this pin sets the modulation filter bandwidth. 6 6 6 en digital input chip-enable digital input pin. set en low maintain the chip in power-down mode. 7 7 7 refen digital input enable for crystal oscillator and frequency reference buffer. 8 8 8 modin digital input bpsk modulation input 9 9 9 ookin digital input on-off keying modulation. on state = high. 10 10 10 vcc2 supply power supply pin for internal rf buffer circuits. bypass with a 100pf and a 0.01f capacitor to gnd as close to the part as possible. 11 11 11 vask analog voltage input ask voltage input pin 12 12 ld digital output lock detector output digital pin. level is high when pll is inside lock range. 12 d.c. do not connect 13 13 13 pwrset anal og inp ut resi stor to gr ound current input set to adjust output power. 14 14 14 vcc3 supply p ow er sup p l y p i n for rf p ow er am p l i fi er ci r cui ts. byp ass w i th a 100p f cap aci tor to gn d as cl ose to the p ar t as p ossi b l e.
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands _______________________________________________________________________________________ 9 pin description (continued) pin max2900 max2901 max2903 max2902 max2904 name pin type function 15 15 15 gnd supply pin ground 16, 17 16, 17 16, 17 rf-, rf+ rf output rf d i ffer enti al outp ut, op en- col l ector typ e 18 n.c. not connected 18 gnd supply pin ground 18 d.c. do not connect 19 19 n.c. not connected 19 divout ecl output divider output 20, 21 20, 21 vco-, vco+ open collector rf vco output (differential) 20 d1 digital input channel selection bit 1 21 d0 digital input channel selection bit 0 22 22 22 osc analog input crystal oscillator connection. see typical operating circuit . 23 23 23 refin analog voltage input refer ence i np ut p i n anal og ( can b e used as i np ut or as cr ystal osci l l ator d r i ver ) . see typical operating circuit . 24 24 vcc4 supply pin power-supply pin for the synthesizer circuits. bypass with a 1000pf capacitor to gnd as close to the part as possible. 24 vcc4 supply pin power-supply pin for the digital circuits. bypass with a 100pf capacitor to gnd as close to the part as possible. 25 25 25 refout analog output buffered clock analog output pin 26 d2 digital input channel selection bit 2 26 div63 digital input division ratio selections (division ratio = 62 when div63 = high; division ratio = 63 when div63 = low). 26 n.c. not connected 27 27 vcc5 supply pin power-supply pin for charge pump circuits. bypass with a 100pf capacitor to gnd as close to the part as possible. 27 vcc5 supply pin power-supply pin. bypass with a 100pf capacitor to gnd as close to the part as possible. 28 28 cpout analog output charge pump output pin 28 d.c. do not connect ground ground ground ground electrical ground back side of package is connected to ground.
detailed description principles of operation when en goes high, the reference and the vco start while the pa stays in the off mode. for max2900/ max2901/max2903, the pll also starts when en goes high. after the lock-detect pin ld goes high, the pa is set to stand-by mode. for the max2902/max2904, the vco loop has to be closed by using an external synthesizer. after this, pulling ookin high turns on the pa. the inter- nal modulation filter smoothes the power ramp-up of the pa. the modulation filter bw is typically 0.8mhz, used for a 1.22mbps chip rate, and can be adjusted by varying rlpf. a high value can be used for rlpf to get a slow pa ramping up when bpsk is not used. the reference blocks can be turned on separately (and earlier) by pulling refen high, to allow the crystal fre- quency to settle. the device supports various modulation modes: bpsk, filtered by the internal modulation filter, is obtained through the modin pin. this is the pre- ferred mode of operation for max2900. ook is obtained digitally with the ookin pin. ask is obtained through the ask pin. fm is imposed on the vco or the reference. fm is the preferred mode of operation for the max2903/max2904 due to the narrowband opera- tion common in europe. the maximum output power is set by the output match- ing network and the external biasing resistor on the pwrset pin. for the max2901 max2904, differential lo outputs are provided to drive a companion receiver and/or an external synthesizer. power-up modes the circuit has four modes of operations, defined as follows: 1) shutdown mode: pin en and refen are low, all functions are off, and the current consumption is leakage only. 2) synth mode: pin en and refen are high, pin ookin is low. the reference circuits, vco, and synthesizer are turned on. the power amplifier is in stand-by mode. total current is less than 50ma. note that as long as the ld pin is not going high, indicating that the pll is unlocked, ookin high is ignored. 3) transmit mode: pin en and refen are high. if output pin ld is high, the device is ready to transmit. when ookin is high, the power amplifier is turned on. the current consumption varies between 50ma and 120ma, depending on the output power requested by the combination of the ook duty cycle, the pwrset value, and output matching circuit. 4) reference only mode: this mode enables the use of the crystal reference from the ic to drive the external logic ics. to obtain this mode, set the refen pin high and en low. in this mode, only the reference circuit turns on, the crystal oscillator starts, and the clock is present at the refout pin. the cur- rent consumption remains much lower than that in the synth mode because the vco, synthesizer, and pa standby circuits are off. when en goes high, the ic goes into the synth mode. synthesizer programming the three pins d0 d2 (max2900) and div63 (max2901/ max2903) are used as digital entries to program the syn- thesizer division ratios. tables 4 and 5 show the division ratios obtained for the various pin logic levels. analog input control pins the two pins pwrset and vask are analog inputs used to control the power of the transmitter. the equiv- alent input schematics are defined in figures 1, 2, and 3. the pwrset pin sets the biasing of the amplification chain. because the last stage of the amplifier operates in saturation, the output power mostly depends on the load and supply voltage. the purpose of the pwrset resistor is to achieve optimum biasing (and therefore efficiency) for various maximum output power configu- rations. for a given application with a known operating voltage and peak power, a fixed value of resistor is determined. the output power range of -7dbm to +23dbm at 4.5v is obtained by choosing a combination of output load line and the resistor on pwrset; 22k ? is max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 10 ______________________________________________________________________________________ 1.2v 100 ? internal circuits pin pwrset external resistor to internal control circuit figure 1. pin pwrset equivalent circuit
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands ______________________________________________________________________________________ 11 used on the ev kit board for +23dbm output power at 4.5v, and 22k ? is also recommended for +20dbm out- put power at +3.0v. for +17dbm at 3.0v, 36k ? is rec- ommended. the current consumption, efficiency, and distortion in the amplification chain are affected by the choice of the resistor rpwrset, offering a lot of design flexibility. the vask pin is an input to the internal gain control cir- cuitry. the gain control is greater than 30db over the full range of input voltages from 0 to vreg = 2.1v. this input is used for ask modulation. at 1v, a typical 15db attenuation is obtained from the peak power. when this input is not used, connect vask to vreg. the rlpf input controls the modulation filter center fre- quency. the rlpf pin sets the bandwidth of the modulation fil- ter. the default filter bandwidth, obtained with a 68k ? resistor, is for 1.2mchips/s. the bandwidth is increased to accommodate 5mchips/s by decreasing the resistor value to about 26k ? . the minimum value for the resistor is 12k ? , which generates the maximum filter band- width. a higher value can be used in fm mode to set up a slow ramp-up time for the pa. data filter characteristics the data filter approximates a 3rd-order butterworth fil- ter. the 3db cut-off frequency is adjusted through the resistor on pin rlpf, which controls the first two poles of the filter (the last high-frequency pole is fixed and set around 10mhz). the filter is adjustable in a range from approximately 700khz to 7mhz. with the nominal setting (3db cut off at 0.8mhz), the fil- ter attenuation is 10db at 3.6mhz. if used with a bpsk at 1.22mhz, this provides about 30db of modulation rolloff at 3.6mhz. hence, a significant channelization effect is obtained. in the wideband setting (3db cut off at 5mhz), the attenuation at 30mhz is still 30db, helping to pass the fcc spurious emissions at 960mhz. 1.2v 100 ? internal circuits pin rlpf external resistor to internal control circuit 1.5v >200k ? internal circuits external resistor bridge to internal control circuit pin vask to vreg (2.1v) figure 2. pin vask equivalent circuit figure 3. pin rlpf equivalent circuit
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 12 ______________________________________________________________________________________ table 2. max2901/max2903 power-up modes table 3. max2902/max2904 power-up modes table 4. max2900 synthesizer programming refen en ookin reference vco mod filter synthesizer pa 0 0 x off off off off 1 0 x on off off off 1 1 0 on on on off 111 on on on on only after ld goes high refen en ookin reference vco mod filter pa 0 0 x off off off 1 0 0 on off off 0 1 0 off on off 1 1 0 on on off 0 1 1 off on on 111 on on on d0 d1 d2 division ratio 0 1 1 249 0 1 0 250 0 0 1 251 0 0 0 252 1 1 1 253 1 1 0 254 1 0 1 255 1 0 0 256 table 5. max2901/max2903 synthesizer programming div 63 division ratio 062 163 table 1. max2900 power-up modes logic level internal block status refen en ookin reference vco mod filter synthesizer pa 0 0 x off off off off 1 0 x on off off off 1 1 0 on on on off 1 1 1 on on on on only after ld goes high
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands ______________________________________________________________________________________ 13 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf r5 vcc1 vreg gnd wbfm (opt) vtune gnd c8 r7 r8 ask (opt) r6 rf- rf+ n.c. n.c. d1 d0 d1 d0 osc refin vcc4 refout refout d2 vcc5 cpout vcc3 pwrset ld vask vreg vcc2 ookin ook modin modin (pn) vcc_pa c26 c23 y1 (opt) c25 c24 c15 c16 l3 l1 l5 loop antenna c31 c33 c28 c18 vcc_drv c4 c2 c1 c35 c3 r4 r3 r1 ext reference (opt) l4 l2 c32 c34 8-channel synthesizer cp gate reg 4 max2900 max2900 typical operating circuit c12 c13 typical operating circuits
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 14 ______________________________________________________________________________________ 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf c13 r5 vcc1 vreg gnd wbfm (opt) vtune gnd c8 r7 r8 ask (opt) r6 rf- rf+ gnd divout vco- vco+ osc refin vcc4 refout refout r11 vcc5 cpout vcc3 pwrset ld vask vreg vcc2 ookin ook modin modin (pn) r10 vcc c37 vcoout vcc_pa c26 c23 y1 c25 c24 c15 c16 c12 l3 l1 l5 loop antenna c31 c33 c28 c18 vcc_drv c4 c2 c1 c35 c3 r4 r3 r1 ext reference /fm input l4 l2 c32 c34 dual- channel (/62 or /63) synthesizer cp gate reg max2901/ max2903 max2901/max2903 typical operating circuit div63 typical operating circuits (continued)
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands ______________________________________________________________________________________ 15 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf c13 r5 vcc1 vreg gnd wbfm (opt) vtune gnd c8 r7 r8 ask (opt) r6 rf- rf+ d.c. n.c. vco- vco+ osc refin vcc4 refout r11 n.c. vcc5 d.c. vcc3 pwrset d.c. vask vreg vcc2 ookin ook modin modin (pn) gate reg max2902/ max2904 r10 vcc cpout refin 1ghz frequency synth rfin c37 vcoout vcc_pa c26 c15 c16 c12 l3 l1 l5 loop antenna c31 c33 c28 c18 vcc_drv c4 c2 c1 c35 c3 r4 r3 r1 reffreq /fm l4 l2 c32 c34 max2902/max2904 typical operating circuit typical operating circuits (continued)
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands 16 ______________________________________________________________________________________ 1 3 2 4 5 6 7 21 19 20 18 17 16 15 810 911121314 28 26 27 25 24 23 22 refen en rlpf vcc1 vreg gnd vtune rf- rf+ d.c. n.c. vco- vco+ osc refin vcc4 refout n.c. vcc5 d.c. vcc3 pwrset d.c. vask vcc2 ookin modin gate reg max2902/ max2904 gnd functional diagrams/ pin configurations (continued) chip information transistor count: 898
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands ______________________________________________________________________________________ 17 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 .)
max2900?ax2904 200mw single-chip transmitter ics for 868mhz/915mhz ism bands maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. 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 max2900 part number table notes: see the max2900 quickview data sheet for further information on this product family or download the max2900 full data sheet (pdf, 832kb). 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 max2900egi qfn;28 pin;5x5x0.9mm dwg: 21-0091i (pdf) use pkgcode/variation: g2855-1 * -40c to +85c rohs/lead-free: no materials analysis max2900egi-t qfn;28 pin;5x5x0.9mm dwg: 21-0091i (pdf) use pkgcode/variation: g2855-1 * -40c to +85c rohs/lead-free: no materials analysis MAX2900ETI+ thin qfn;28 pin;5x5x0.8mm dwg: 21-0140k (pdf) use pkgcode/variation: t2855+4 * -40c to +85c rohs/lead-free: yes materials analysis MAX2900ETI+t -40c to +85c rohs/lead-free: yes 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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