Precision Micropower, Low Dropout Voltage References Data Sheet REF19x Series FEATURES TEST PINS Temperature coefficient: 5 ppm/C maximum Test Pin 1 and Test Pin 5 are reserved for in-package Zener zap. High output current: 30 mA To achieve the highest level of accuracy at the output, the Zener Low supply current: 45 A maximum zapping technique is used to trim the output voltage. Because 1 Initial accuracy: 2 mV maximum each unit may require a different amount of adjustment, the Sleep mode: 15 A maximum resistance value at the test pins varies widely from pin to pin Low dropout voltage and from part to part. The user should leave Pin 1 and Pin 5 Load regulation: 4 ppm/mA unconnected. Line regulation: 4 ppm/V TP 1 8 NC REF19x Short-circuit protection V 2 7 NC S SERIES SLEEP 3 6 OUTPUT TOP VIEW (Not to Scale) GND 4 5 TP APPLICATIONS Portable instruments NOTES 1. NC = NO CONNECT. ADCs and DACs 2. TP PINS ARE FACTORY TEST Smart sensors POINTS, NO USER CONNECTION. Solar powered applications Figure 1. 8-Lead SOIC N and TSSOP Pin Configuration (S Suffix and RU Suffix) Loop-current-powered instruments TP 1 8 NC REF19x V 2 7 NC S GENERAL DESCRIPTION SERIES SLEEP 3 6 OUTPUT TOP VIEW The REF19x series precision band gap voltage references use a GND 4 (Not to Scale) 5 TP patented temperature drift curvature correction circuit and NOTES laser trimming of highly stable, thin-film resistors to achieve a 1. NC = NO CONNECT. very low temperature coefficient and high initial accuracy. 2. TP PINS ARE FACTORY TEST POINTS, NO USER CONNECTION. The REF19x series is made up of micropower, low dropout Figure 2. 8-Lead PDIP Pin Configuration voltage (LDV) devices, providing stable output voltage from (P Suffix) supplies as low as 100 mV above the output voltage and Table 1. Nominal Output Voltage consuming less than 45 A of supply current. In sleep mode, Part Number Nominal Output Voltage (V) which is enabled by applying a low TTL or CMOS level to the REF191 2.048 SLEEP pin, the output is turned off and supply current is REF192 2.50 further reduced to less than 15 A. REF193 3.00 The REF19x series references are specified over the extended REF194 4.50 industrial temperature range (40C to +85C) with typical REF195 5.00 performance specifications over 40C to +125C for REF196 3.30 applications, such as automotive. REF198 4.096 All electrical grades are available in an 8-lead SOIC package the PDIP and TSSOP packages are available only in the lowest electrical grade. 1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section). Rev. L Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 19962011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00371-002 00371-001REF19x Series Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Electrical CharacteristicsREF196 40C TA +125C ....................................................................................................... 13 Applications....................................................................................... 1 Electrical CharacteristicsREF198 TA = 25C.................. 14 General Description ......................................................................... 1 Electrical CharacteristicsREF198 40C TA +85C Test Pins ............................................................................................. 1 ....................................................................................................... 14 Revision History ............................................................................... 3 Electrical CharacteristicsREF198 40C T 125C15 A Specifications..................................................................................... 4 Absolute Maximum Ratings ......................................................... 16 Electrical CharacteristicsREF191 T = 25C.................... 4 A Thermal Resistance.................................................................... 16 Electrical CharacteristicsREF191 40C +85C........... 5 ESD Caution................................................................................ 16 Electrical CharacteristicsREF191 Typical Performance Characteristics ........................................... 17 40C TA +125C................................................................... 6 Applications Information .............................................................. 20 Electrical CharacteristicsREF192 TA = 25C.................... 6 Output Short-Circuit Behavior ................................................ 20 Electrical CharacteristicsREF192 40C TA +85C ......................................................................................................... 7 Device Power Dissipation Considerations.............................. 20 Electrical CharacteristicsREF192 40C T +125C Output Voltage Bypassing ......................................................... 20 A ......................................................................................................... 7 Sleep Mode Operation............................................................... 20 Electrical CharacteristicsREF193 T = 25C.................... 8 A Basic Voltage Reference Connections ..................................... 20 Electrical CharacteristicsREF193 40C TA +85C Membrane Switch-Controlled Power Supply............................. 20 ......................................................................................................... 8 Solder Hear Effect ...................................................................... 21 Electrical CharacteristicsREF193 TA 40C +125C Current-Boosted References with Current Limiting............. 21 ......................................................................................................... 9 Negative Precision Reference Without Precision Resistors.. 22 Electrical CharacteristicsREF194 T = 25C.................... 9 A Stacking Reference ICs for Arbitrary Outputs ....................... 22 Electrical CharacteristicsREF194 40C T +85C A ....................................................................................................... 10 Precision Current Source .......................................................... 23 Switched Output 5 V/3.3 V Reference..................................... 23 Electrical CharacteristicsREF194 40C TA +125C ....................................................................................................... 10 Kelvin Connections.................................................................... 24 Electrical CharacteristicsREF195 TA = 25C.................. 11 Fail-Safe 5 V Reference.............................................................. 24 Electrical CharacteristicsREF195 40C TA +85C Low Power, Strain Gage Circuit ............................................... 25 ....................................................................................................... 11 Outline Dimensions....................................................................... 26 Electrical CharacteristicsREF195 40C T +125C A Ordering Guide .......................................................................... 27 ....................................................................................................... 12 Electrical CharacteristicsREF196 T = 25C.................. 12 A Electrical CharacteristicsREF196 40C TA +85C ....................................................................................................... 13 Rev. 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