the SP8908 is one of a range of very high speed low power prescalers for professional applications. the dividing elements are static d type flip flops and therefore allow operation down to dc if the drive signal is a pulse waveform with fast risetime. the output stage has a differential current output and provides a direct drive into a 50 ohm load. features very high operating speed operation down to dc with square wave input silicon technology for low phase noise (typically better than 2 140dbc/hz at 1khz) 5v single supply operation low power dissipation: 360mw (typ.) surface mount plastic package absolute maximum ratings supply voltage, v cc storage temperature maximum junction temperature prescaler input voltage operating temperature 6?v 2 65 c to 1 150 c 1 150 c 2?vp-p kg 2 40 c to 1 85 c t case figure 1 - block diagram 4 8 400 400 v cc v ref output v cc 10ma output output 18 7 6 2 3 input input 44 gnd SP8908 (mp) 5ghz 8 fixed modulus divider preliminary information ds4359 issue 1.3 september 1999 ordering information SP8908/kg/mp1s (tubes) SP8908/kg/mp1t (tape and reel)
2 SP8908 preliminary information 800 600 400 200 v in into 50 ? (mv rms) 12 3 4 56 7 frequency (ghz) operating window tested as per table of electrical characteristics figure 3 - typical input sensitiviy (sinewave drive) figure 2 - pin connections - top view 1 2 3 4 8 7 6 5 output v cc output output gnd v cc input input gnd mp8 SP8908 electrical characteristics these characteristics are guaranteed by either production test or design over the following range of operating conditions unless otherwise stated: t amb = 2 40 c to 1 85 c, v cc = 4?5v to 5?5v - 1? - - 440 700 - 2 10? characteristic rms sinewave f in = 1ghz and 4.2ghz f in = 5ghz f in = 1ghz and 3ghz f in = 5.0ghz and 3.8ghz into 50 ? pullup resistor f in = 1ghz and 5ghz (see note 1 ) 96 5? 180 570 - - - 1 2? conditions pin 1, 8 2, 3 2, 3 2, 3 2, 3 2, 3 6, 7 6, 7 supply current input frequency input sensitivity input sensitivity input overload input overload output voltage output power typ. max. min. value units ma ghz mvrms mvrms mvrms mvrms vp-p dbm 72 - - - - - 0? 0 note 1. measured into 50 ? measuring instrument in parallel with 50 ? pullup resistor. see figure 5.
3 SP8908 preliminary information figure 4 - typical application and test circuit j2 j1 j0.5 j0.2 0 2 j0.2 2 j0.5 2 j1 2 j2 1 0.5 0.2 j5 2 j5 2 5 0 3ghz 3ghz 5ghz 1ghz figure 5 - typical input impedance 1 2 3 4 8 7 6 5 v cc 1 5v 1n 10n 1n signal generator 50 50 1n 1n 10n 50 ? measuring instrument SP8908
4 SP8908 preliminary information figure 6 - typical phase noise, input frequency = 3ghz 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 l (f) [dbc/hz] 10 100 1k 10k 100k frequency (hz)
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