this document is for maintenance purposes only and is not recommended for new designs
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)
ZN404 4 headquarters operations gec plessey semiconductors cheney manor, swindon, wiltshire sn2 2qw, united kingdom. tel: (0793) 518000 fax: (0793) 518411 gec plessey semiconductors p.o. box 660017 1500 green hills road, scotts valley, california 95067-0017, united states of america. tel: (408) 438 2900 fax: (408) 438 5576 this publication is issued to provide information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. no warranty or guarantee express or implied is made regard ing the capability, performance or suitability of any product or service. the company reserves the right to alter without prior knowledge the specification, design or price of any product or service. information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. these products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to the company's conditions of sale, w hich are available on request. customer service centres ? france & benelux les ulis cedex tel: (1) 64 46 23 45 fax : (1) 64 46 06 07 ? germany munich tel: (089) 3609 06-0 fax : (089) 3609 06-55 ? italy milan tel: (02) 66040867 fax: (02) 66040993 ? japan tokyo tel: (03) 5276-5501 fax: (03) 5276-5510 ? north america scotts valley, usa. tel (408) 438 2900 fax: (408) 438 7023. ? south east asia singapore tel: (65) 3827708 fax: (65) 3828872 ? sweden stockholm, tel: 46 8 702 97 70 fax: 46 8 640 47 36 ? uk, eire, denmark, finland & norway swindon tel: (0793) 518510 fax : (0793) 518582 these are supported by agents and distributors in major countries world-wide. ? gec plessey semiconductors 1994 publication no. ds3030 issue no. 2.1 february 1994
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