this document is for maintenance purposes only and is not recommended for new designs
REF25Z/ref25d 2.5v micropower precision reference the REF25Z and ref25d are integrated circuits using the bandgap principle to provide a precise stable reference voltage of 2.5v without the need for an external shaping capacitor. there are two package options available: REF25Z in a plastic 3-pin to-92 and ref25d in a miniature surface mount package (mp8). these references feature a recommended operating cur- rent of 60 m a to 5ma which make them ideal for all low power and battery applications. ds2428 - 2.2 features n low knee current - typically 40 microamps n ideal for battery operation - 150 microwatts n internally shaped n REF25Z - 3 lead to-92 plastic package n ref25d - miniature plastic surface mount package (mp8) n tight initial v ref tolerance 1% n low temperature coefficient n low slope resistance n low cost n operation over industrial temperature range device type operating temperature package REF25Z -40 c to +85 c to-92 ref25d -40 c to +85 c mp8 ordering information fig.1 pin connection absolute maximum ratings reference current 5ma operating temperature range: REF25Z -40 to +85 c ref25d -40 to +85 c storage temperature -55 to +125 c storage temperature for a max. time of 10ns: within 1.59mm of the seating plane 300 c within 0.80mm of the seating plane 265 c fig.2 internal connections
REF25Z/25d 2 notes 1. slope resistance (r ref ) slope resistance is defined as r ref = change in v ref over a specified current range the change in reference current 2. reference voltage temperature coefficient (tc v ref ) this is the normalised reference voltage change over temperature, divided by the change in temperature. it is expressed in ppm/ c tc v ref = d v ref x 10 6 ppm/ c v ref x d t d t = temperature change in c d v ref = change in reference voltage over temperature change d t REF25Z ref25d REF25Z ref25d 1khz to 10khz electrical characteristics these characteristics are guaranteed over the following conditions (unless otherwise stated) t amb = 25 c, i ref = 150 m a output voltage slope resistance (note 1) turn-on (knee) current recommended operating current range temperature coefficient (note 2) rms noise voltage turn-on time turn-off time turn-on time turn-off time v ref r ref i on i ref tc v ref e n t on t off t on t off 2.475 0.06 2.500 1.2 1.2 40 35 35 13 80 7 65 2 2.525 2.0 2.0 5.0 110 80 characteristic symbol conditions value min. typ. max. v w w m a ma ppm/ c ppm/ c m v m s m s m s m s units i ref = 500 m a note 2 i ref = 150 m a to 5ma
REF25Z/25d 3 fig.3 connection diagram
REF25Z/25d 4 fig.4 typical reference characteristic fig.5 typical temperature characteristics at i ref = 150 m a 25 c temperature ( c)
REF25Z/25d 5 fig.6 typical dynamic impedance
REF25Z/25d 6 fig.7 typical response time fig.8 derating curve REF25Z/25d
REF25Z/25d 7
REF25Z/25d 8 headquarters operations gec plessey semiconductors cheney manor, swindon, wiltshire sn2 2qw, united kingdom. tel: (0793) 518000 fax: (0793) 518411 gec plessey semiconductors sequoia research park, 1500 green hills road, scotts valley, california 95066, united states of america. tel: (408) 438 2900 fax: (408) 438 5576 customer service centres ? france & benelux les ulis cedex tel: (1) 64 46 23 45 tx: 602858f fax : (1) 64 46 06 07 ? germany munich tel: (089) 3609 06-0 tx: 523980 fax : (089) 3609 06-55 ? italy milan tel: (02) 66040867 fax: (02) 66040993 ? japan tokyo tel: (03) 3296-0281 fax: (03) 3296-0228 ? north america integrated circuits and microwave products scotts valley, usa tel (408) 438 2900 fax: (408) 438 7023. hybrid products, farmingdale, usa tel (516) 293 8686 fax: (516) 293 0061. ? south east asia singapore tel: (65) 3827708 fax: (65) 3828872 ? sweden stockholm, tel: 46 8 702 97 70 fax: 46 8 640 47 36 ? united kingdom & scandinavia swindon tel: (0793) 518510 tx: 444410 fax : (0793) 518582 these are supported by agents and distributors in major countries world-wide. ? gec plessey semiconductors 1994 publication no. ds2428 issue no. 2.2 january 1994 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.
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