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zn404 / ZN404D 2.45v precision reference regulator the zn404 is a monolithic integrated circuit providing a precise stable reference source of 2.45v without the need for an external shaping capacitor. features n low temperature coefficient n low slope resistance n very good long term stability n low noise n internally shaped n tight tolerance n zn404 - 2-lead to-18 metal can package n ZN404D - 8-lead miniature plastic surface mount package ds3030 - 2.1 fig.1 pin connections device zn404 ZN404D package -20 c to +70 c -20 c to +70 c operating temperature cm2 mp8 ordering information absolute maximum ratings dissipation 300mw operating temperature range zn404 -20 c to +70 c ZN404D -20 c to +70 c storage temperature range -55 c to +125 c fig.2 circuit diagram av -ve +ve band gap reference gnd r r = v s v ref v s - v ref i ref gnd v ref 1v ref 8 nc 2nc 7 nc 3nc 6 nc 4nc 5 gnd zn404 (cm2) - bottom view ZN404D (mp8) - top view
zn404 2 electrical characteristics (at t amb = 25 c unless otherwise specified) output voltage slope resistance reference current maximum change in v ref rms noise voltage 1hz-10khz v ref drift at 70 c v ref r ref i ref d v ref 2.38 - 2.0 - 2.45 0.1 - 6 10 10 2.52 0.2 120 33 - - v w ma mv m v ppm/1000 hours measured at 2ma -20 to +70 c 1khz - 10khz cm2 package parameter symbol min. typ. max. units test conditions fig.3 dynamic impedance 10 1.0 0.1 dynamic impedance (ohms) 0.1 1.0 10 100 frequency (khz) i ref = 2ma i ref = 20ma
zn404 3 0.4 0.8 1.2 1.6 2.0 2.4 2.8 10 -1 10 -2 10 -3 10 -4 forward voltage (v) forward current (a) 01020 30 40 50 60 70 80 -10 -8 -6 -4 -2 0 2 4 6 8 10 temperature (?) change in reference voltage, d v (mv)
fig.4 forward characteristic (typical) fig.5 temperature characteristic (typical) fig.6 derating curve 0 10202530405060 70 ambient temperature (?) 140 120 100 80 75 60 40 20 0 i ref (max) (ma)
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