High Temperature, Low Drift, Micropower 2.5 V Reference ADR225 Data Sheet PIN CONFIGURATION Extreme high temperature operation −40°C to +210°C, 8-lead FLATPACK −40°C to +175°C, 8-lead SOIC Temperature coefficient 30 ppm/°C, 8-lead FLATPACK 10 ppm/°C, 8-lead SOIC High output current: 10 mA Low supply current: 50 µA maximum Initial accuracy: ±0.4% (±10 mV maximum), 8-lead SOIC Low dropout voltage Wide supply range: 3.3 V to 16 V 8 NC VS 2 ADR225 7 NC NC 3 TOP VIEW (Not to Scale) 6 OUTPUT 5 NC NC 1 GND 4 NOTES 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. 11525-001 FEATURES Figure 1. APPLICATIONS Down-hole drilling and instrumentation Avionics Heavy industrial High temperature environments GENERAL DESCRIPTION The ADR225 is a precision 2.5 V band gap voltage reference specified for a high temperature operation of 175°C and 210°C. It uses a micropower core topology and laser trimming of highly stable, thin film resistors to achieve a temperature coefficient of 30 ppm/°C (maximum) up to 175°C and an initial accuracy of 0.4% (±10 mV maximum). A maximum operating current of 50 µA and a low dropout voltage allow the ADR225 to function very well in battery-powered equipment. The ADR225 voltage reference is offered in an 8-lead SOIC package with an operating temperature range of −40°C to +175°C. Rev. A It is also available in an 8-lead ceramic flat pack (FLATPACK) with an operating temperature range of −40°C to +210°C. Both devices are designed for robustness at extreme temperatures and are qualified for 1000 hours of operation at the maximum temperature rating. The ADR225 is a member of a growing series of high temperature qualified products offered by Analog Devices, Inc. For a complete selection table of the available high temperature products, see the high temperature product list and qualification data available at www.analog.com/hightemp. Document Feedback 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADR225 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Predicted Lifetime vs. Operating Temperature .........................4 Applications ....................................................................................... 1 Thermal Resistance .......................................................................4 Pin Configuration ............................................................................. 1 ESD Caution...................................................................................4 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................5 Revision History ............................................................................... 2 Theory of Operation .........................................................................8 Specifications..................................................................................... 3 Basic Voltage Reference Connections ........................................8 Electrical Characteristics ............................................................. 3 Outline Dimensions ..........................................................................9 Absolute Maximum Ratings ............................................................ 4 Ordering Guide .............................................................................9 REVISION HISTORY 9/13—Rev. 0 to Rev. A Changes to Data Sheet Title and Added Wide Supply Range: 3.3 V to 16 V to Features Section .............................................................. 1 Changed Supply Voltage from −0.3 V to +15 V to −0.3 V to +18 V; Table 2 .................................................................................... 4 7/13—Revision 0: Initial Version Rev. A | Page 2 of 12 Data Sheet ADR225 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = 3.3 V, VOUT = 2.5 V, TMIN < TA < TMAX, unless otherwise noted. Table 1. Parameter SUPPLY CURRENT INITIAL ACCURACY 1 TEMPERATURE COEFFICIENT 2 REGULATION Line Regulation Load Regulation 3 VOLTAGE Dropout Voltage Noise Voltage 1 2 3 8-Lead SOIC −40°C ≤ TA ≤ +175°C Min Typ Max 30 50 ±2 ±10 10 30 Symbol ISY VO TCVOUT Test Conditions/Comments No load IOUT = 0 mA IOUT = 0 mA ΔVOUT/ΔVIN ΔVOUT/ΔVLOAD 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA VS = 5.0 V, 0 mA ≤ IOUT ≤ 10 mA 5 10 VS − VOUT eN ILOAD = 10 mA 0.1 Hz to 10 Hz 25 8-Lead FLATPACK −40°C ≤ TA ≤ +210°C Min Typ Max 35 ±5 30 40 40 5 10 ppm/V ppm/mA 1.00 1.00 25 V µV p-p For proper operation, a 1 µF capacitor is required between the OUTPUT pin and the GND pin of the device. TCVOUT is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C. TCVOUT = (VMAX − VMIN)/VOUT(TMAX − TMIN) Load regulation specification includes the effect of self-heating. Rev. A | Page 3 of 12 Unit µA mV ppm/°C ADR225 Data Sheet ABSOLUTE MAXIMUM RATINGS 100k Table 2. −40°C to +175°C −40°C to +210°C −40°C to +200°C −40°C to +245°C 300°C 10k 1k 100 10 1 120 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PREDICTED LIFETIME vs. OPERATING TEMPERATURE Comprehensive reliability testing is performed on the ADR225. Product lifetimes at extended operating temperature are obtained using high temperature operating life (HTOL). Lifetimes are predicted from the Arrhenius equation, taking into account potential design and manufacturing failure mechanism assumptions. HTOL is performed to JEDEC JESD22-A108. A minimum of three wafer fab and assembly lots are processed through HTOL at the maximum operating temperature. Comprehensive reliability testing is performed on all Analog Devices, Inc., high temperature (HT) products. 130 140 150 160 170 180 190 200 210 OPERATING TEMPERATURE (°C) 11525-021 Rating −0.3 V to +18 V −0.3 V to VS + 0.3 V −65°C to +150°C PREDICTED LIFETIME (Hours) Parameter Supply Voltage OUTPUT to GND Storage Temperature Range Operating Temperature Range 8-Lead SOIC 8-Lead FLATPACK Junction Temperature Range 8-Lead SOIC 8-Lead FLATPACK Lead Temperature (Soldering 60 sec) Figure 2. Predicted Lifetime vs. Operating Temperature THERMAL RESISTANCE θJA is specified for worst-case conditions; that is, θJA is specified for the device soldered in the circuit board. Table 3. Package Type 8-Lead SOIC 8-Lead FLATPACK ESD CAUTION Rev. A | Page 4 of 12 θJA 121 100 θJC 43 15 Unit °C/W °C/W Data Sheet ADR225 TYPICAL PERFORMANCE CHARACTERISTICS VS = 3.3 V, VOUT = 2.5 V, TMIN ≤ TA ≤ TMAX for 8-lead SOIC package, unless otherwise noted. 50 2.510 45 SUPPLY CURRENT (µA) OUTPUT VOLTAGE (V) 40 2.505 2.500 2.495 35 30 25 20 15 10 0 –40 –25 –10 11525-004 5 20 35 50 65 80 95 110 125 140 155 170 TEMPERATURE (°C) 5 11525-007 5 2.490 –40 –25 –10 20 35 50 65 80 95 110 125 140 155 170 TEMPERATURE (°C) Figure 6. Supply Current (ISY) vs. Temperature Figure 3. Output Voltage (VOUT) vs. Temperature 18 0 16 LOAD REGULATION (ppm/mA) –5 NUMBER OF UNITS 14 12 10 8 6 4 –10 –15 –20 –25 –30 –24 –18 –12 –6 0 6 12 18 24 30 TCVOUT (ppm/°C) –30 –40 –25 –10 5 11525-005 0 TEMPERATURE (°C) Figure 7. Load Regulation vs. Temperature (ILOAD = 0 mA to 10 mA) Figure 4. TCVOUT Distribution, −40°C to +175°C 60 60 50 LINE REGULATION (ppm/V) 70 40 30 20 10 40 30 20 10 –0.5 –0.4 –0.3 –0.2 –0.1 0 0.1 0.2 0.3 0.4 OUTPUT VOLTAGE ACCURACY (%) 0.5 0.6 –10 –40 –25 –10 5 20 35 50 65 80 95 110 125 140 155 170 TEMPERATURE (°C) Figure 8. Line Regulation vs. Temperature Figure 5. Output Voltage Accuracy at 175°C Rev. A | Page 5 of 12 11525-008 0 11525-006 NUMBER OF PARTS 50 0 20 35 50 65 80 95 110 125 140 155 170 11525-009 2 ADR225 1.0 Data Sheet –40°C +25°C +175°C 0.9 VIN = 5V/DIV CIN = COUT = 1µF RL = 10kΩ DROPOUT VOLTAGE (V) 0.8 10V 5V 0.7 0V 1 0.6 0.5 0.4 0.3 VOUT = 200mV/DIV 2 0.2 0 2 4 6 8 10 12 LOAD CURRENT (mA) CH1 5V Figure 9. Dropout Voltage vs. Load Current (ILOAD) B W CH2 200mV A CH1 M200µs 11525-014 0 11525-010 0.1 7.3V Figure 12. Line Transient Response (see Figure 17) 2.508 LOAD CURRENT UNIT 1 UNIT 3 UNIT 5 0mA 2.504 10mA 1 2.502 VOUT = 20mV/DIV COUT = 1µF 2.500 2 55 70 85 100 115 130 145 160 175 TEMPERATURE (°C) CH1 1V A CH1 M100µs CH2 20mV 11525-012 2.496 40 11525-011 2.498 1.32V Figure 13. Load Transient Response Figure 10. Thermal Hysteresis, ILOAD = 0 mA VIN = 2V/DIV COUT = 1µF NO LOAD VOUT = 1V/DIV 1 2 CH1 2V B W CH2 1V M100µs A CH1 4.4V –20 –40 –60 –80 –100 –120 10 100 1k 10k 100k FREQUENCY (Hz) Figure 11. Power-On Response (see Figure 17) 1M 10M 11525-015 POWER SUPPLY REJECTION RATIO (dB) 0 11525-013 OUTPUT VOLTAGE (V) 2.506 Figure 14. Power Supply Rejection Ratio (PSRR) vs. Frequency, CLOAD = 1 µF Rev. A | Page 6 of 12 Data Sheet ADR225 10.24 OUTPUT IMPEDANCE (Ω) 5.12 2.56 1.28 0.64 0.32 0.16 0.08 0.04 0.01 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 11525-020 0.02 Figure 15. Output Impedance (ZOUT) vs. Frequency, CIN = COUT = 1 µF Rev. A | Page 7 of 12 ADR225 Data Sheet THEORY OF OPERATION The circuit shown in Figure 16 is the basic configuration for the ADR225. Note that a 10 µF and 0.1 µF bypass network on the input and at least a 1 µF bypass capacitor on the output are required for proper device operation. It is recommended that no connections be made to Pin 1, Pin 3, Pin 5, Pin 7, and Pin 8. 0.1µF 10µF NC 1 8 NC VS 7 NC 2 NC 3 ADR225 6 5 4 OUTPUT + 1µF TANT NC + 1µF 11525-002 BASIC VOLTAGE REFERENCE CONNECTIONS NC = NO CONNECT. Figure 16. Basic Voltage Reference Connections V+ VCC +5V +5V U1 ADR225 C2 0.1µF GND + C3 1µF C4 0.1µF R3 2.5kΩ +VS AD8634 +IN A +5V –IN A U3 AD8229 +IN –5V V– –IN R1 2.5kΩ Figure 17. Typical High Temperature Resistance Temperature Detector (RTD) Signal Conditioning Circuit Rev. A | Page 8 of 12 VOUT RTD –5V –VS 11525-017 OUTPUT + C1 10µF U2A R2 2.5kΩ VS Data Sheet ADR225 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 012407-A 8 4.00 (0.1574) 3.80 (0.1497) Figure 18. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 1.00 0.260 0.255 SQ 0.250 0.195 0.190 SQ 0.185 1 0.155 0.150 0.145 8 4 0.012 R TYP 0.006 0.005 0.004 0.035 TYP 0.019 0.017 0.015 5 TOP VIEW 0.05 TYP IDEX MARK 0.091 0.083 0.075 END VIEW 0.026 MIN 0.054 0.044 0.034 BOTTOM VIEW 0.024 0.007 MIN SIDE VIEW 03-26-2013-A 0.053 0.050 0.047 0.175 Figure 19. 8-Lead Ceramic Flat Package [FLATPACK] (F-8-2) Dimensions shown in inches ORDERING GUIDE Model1 ADR225HRZN ADR225HFZ 1 Temperature Range −40°C to +175°C −40°C to +210°C Package Description 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Ceramic Flat Package [FLATPACK] Z = RoHS Compliant Part. Rev. A | Page 9 of 12 Package Option R-8 F-8-2 ADR225 Data Sheet NOTES Rev. A | Page 10 of 12 Data Sheet ADR225 NOTES Rev. A | Page 11 of 12 ADR225 Data Sheet NOTES ©2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D11525-0-9/13(A) Rev. A | Page 12 of 12