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| frequency control products type dfa 20 revision 01 checked jya date 24.01.2002 page 57 high stability small size tcxo dfa 20 optional external voltage control very high overall stability standard package low ageing function dfa 20 vcc 1 output 2 gnd 3 gnd/pot in/vco 4 gnd 5 type dfa 20-h dfa 20-mh dfa 20-s dfa 20-o frequency range (mhz) 1 to 27 25 to 40 4 to 27 1 to 27 electrical specifications supply voltage 5 to 15 v 5 % 5 to 15 v 5 % 5 to 15 v 5 % supply current ( no load) 25 mhz 7 ma 20 ma 7 ma > 25 mhz 30 ma 30 ma 10 ma clipped sine output load hcmos 15 pf or 2 ttl sine 50 ? 10 % 20 k ? //5 pf duty cycle @ 2.5 v 40/60...60/40 % rise/fall times 10 ns high/low levels or output amplitude 3.5/ 0.5 v 0 dbm 2 db 2 v p-p start-up 10 ms 10 ms 10 ms frequency stability detailed tolerances [ ppm ] temperature model stability versus : types range code temperature vcc 5 % load 10 % ageing 0 to 50c a0.5 0.5 -10 to 60c d1 1 c1 1 -20 to 70c c2 2 -30 to 75c n2 2 all types -40 to 85c e3 3 0.1 0.1 1 factory calibration if no trimming option 1 ppm remarks ageing is 1 st year at 25c options code external voltage v 2.5 2 v 5 ppm , positive slope internal trimmer a 5 ppm external potentiometer y 10 k ? 5 ppm (not available with internal trimmer) ordering code type + option code + frequency + model code/ voltage value example dfa 20-ha 12.288 mhz n2/5 9.70.1 0.45 5.1 0.40.1 1 2 4 5 3 20.30.1 20.30.1 7.62 7.62 15.24 option y 10k pot in gnd
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