THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS3025 - 2.1 ZN458 2.45V PRECISION REFERENCE REGULATOR The ZN458 is a monolithic integrated circuit providing a precise stable reference source of 2.45V in a two lead package without the need for an external shaping capacitor. +VE -VE FEATURES ■ Guaranteed 5mV Maximum Deviation over Full Temperature Range ■ Low Temperature Coefficient 0.003%/°C ■ Low Slope Resistance - 0.1 Ohms ■ Very Good Long Term Stability - 10ppm ■ Low Noise - 10 microvolts ■ Internally Shaped ■ Tight Tolerance ±1.43% ■ Two Pin Package ■ Wide Operating Current 2-120mA CM2 Fig.1 Pin connection - bottom view VS VS - VREF R= IREF R ABSOLUTE MAXIMUM RATINGS Dissipation Operating temperature range Storage temperature range -20°C to +70°C -55°C to +150°C ORDERING INFORMATION TC (ppm/°C) Temperature range ZN458 99 -20°C to +70°C ZN458A 49 -20°C to +70°C ZN458B 29 -20°C to +70°C Device VREF +VE 300mW AV BAND GAP REFERENCE -VE Fig.2 Circuit diagram GND ZN458 ELECTRICAL CHARACTERISTICS (at Tamb = 25°C unless otherwise specified) Symbol Min. Typ. Max. Units Output voltage VREF 2.42 2.45 2.49 V Slope resistance RREF - 0.1 0.2 Ω Reference current IREF 2.0 - 120 mA 10 ∆VREF - 6 4 22 11 6.5 mV mV RMS noise voltage 1Hz-10kHz - 10 - µV VREF drift at 70°C - ±10 - ppm/1000 Parameter Maximum change in VREF ZN458 ZN458A ZN458B Test conditions Measured at 2mA -20 to +70°C hours DYNAMIC IMPEDANCE (ohms) 10 IREF = 2mA 1.0 IREF = 20mA 0.1 0.1 1.0 10 FREQUENCY (kHz) Fig.3 Dynamic impedance 2 100 ZN458 10 CHANGE IN REFERENCE VOLTAGE, δV (mV) 8 FORWARD CURRENT (A) 10-1 10-2 10-3 10-4 0.4 0.8 1.2 1.6 2.0 2.4 FORWARD VOLTAGE (V) 2 0 -2 -4 ZN458 -6 -8 5 5 4 4 3 2 1 0 -1 -2 -3 ZN458A -4 -5 0 10 20 30 40 50 60 TEMPERATURE (°C) 70 0 10 20 30 40 50 60 TEMPERATURE (°C) 70 80 Fig.5 Temperature characteristic (typical) CHANGE IN REFERENCE VOLTAGE, δV (mV) CHANGE IN REFERENCE VOLTAGE, δV (mV) 4 -10 2.8 Fig.4 Forward characteristic 6 80 Fig.6 Temperature characteristic (typical) 3 2 1 0 -1 -2 ZN458B -3 -4 -5 0 10 20 30 40 50 60 TEMPERATURE (°C) 70 80 Fig.7 Temperature characteristic (typical) 3 ZN458 140 120 100 80 IREF (max.) 75 (mA) 60 40 20 0 -30 -20 -10 0 10 20 25 30 40 AMBIENT TEMPERATURE (C) Fig.8 Derating curve 4 50 60 70 ZN458 5 ZN458 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 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 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 • 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. DS3025 Issue No. 2.1 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 regarding 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, which are available on request. 6