Precision 2.5 V, 5.0 V, and 10.0 V Voltage References REF01/REF02/REF03 FEATURES GENERAL DESCRIPTION High output accuracy REF01: 10.0 V, 0.3% maximum REF02: 5.0 V, 0.3% maximum REF03: 2.5 V, 0.6% maximum Adjustable output: 3% minimum Excellent temperature stability REF01: 8.5 ppm/C maximum REF02: 8.5 ppm/C maximum REF03: 50 ppm/C maximum Low noise REF01: 30 V p-p typical REF02: 15 V p-p typical REF03: 6 V p-p typical High supply voltage range: up to 36 V maximum Low supply current: 1.4 mA maximum High load-driving capability: 10 mA maximum Temperature output function The REF0x series of precision voltage references provide a stable 10.0 V, 5.0 V, or 2.5 V output with minimal change in response to variations in supply voltage, ambient temperature or load conditions. The parts are available in 8-lead SOIC, PDIP, CERDIP, and TO-99 packages, as well as 20-terminal LCC packages (883 only), furthering the parts' usability in both standard and high stress applications. With an external buffer and a simple resistor network, the TEMP terminal can be used for temperature sensing and approximation. A TRIM terminal is also provided on the device for fine adjustment of the output voltage. The small footprint, wide supply range, and application versatility make the REF0x series of references ideal for generalpurpose and space-constrained applications. Newer designs should use the ADR0x series of references, which offer higher accuracy and temperature stability over a wider operating temperature range, while maintaining full pinfor-pin compatibility with the REF0x series. This data sheet applies to commercial-grade products only. Contact sales or visit analog.com for military-grade (883) data sheets. APPLICATIONS Precision data systems High resolution converters Industrial process control systems Precision instruments Military and aerospace applications Table 1. Selection Guide Part Number REF01 REF02 REF03 Output Voltage 10.0 V 5.0 V 2.5 V Input Voltage Range 12 V to 36 V 7.0 V to 36 V 4.5 V to 36 V NC Figure 1. 8-Lead PDIP (P-Suffix), 8-Lead CERDIP (Z-Suffix), 8-Lead SOIC (S-Suffix) 5 NC NC NC NC TEMP 7 VOUT NC TOP VIEW (Not to Scale) 15 NC 8 VOUT 14 NC TRIM 4 GROUND (CASE) NC = NO CONNECT. DO NOT CONNECT ANYTHING ON THESE PINS. SOME OF THEM ARE RESERVED FOR FACTORY TESTING PURPOSES. Figure 2. 8-Lead TO-99 (J-Suffix) 9 10 11 12 13 NC = NO CONNECT. DO NOT CONNECT ANYTHING ON THESE PINS. SOME OF THEM ARE RESERVED FOR FACTORY TESTING PURPOSES. 00375-003 NC = NO CONNECT. DO NOT CONNECT ANYTHING ON THESE PINS. SOME OF THEM ARE RESERVED FOR FACTORY TESTING PURPOSES. 6 NC 6 VOUT TOP VIEW 5 TRIM (Not to Scale) NC 16 NC 6 REF01/ REF02/ REF03 NC 3 NC 17 TRIM NC 18 REF01/ REF02 NC 7 20 19 NC GND 4 NC 1 GND TEMP 3 8 2 VIN 5 7 NC 00375-002 VIN 2 REF01/ REF02/ REF03 00375-001 NC 1 VIN 2 3 NC 4 8 NC 1 NC PIN CONFIGURATIONS Figure 3. 20-Terminal LCC (RC-Suffix; 883 Parts Only) Rev. K 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 www.analog.com Fax: 781.461.3113 (c)2000-2010 Analog Devices, Inc. All rights reserved. REF01/REF02/REF03 TABLE OF CONTENTS Features .............................................................................................. 1 Output Adjustment .................................................................... 14 Applications ....................................................................................... 1 Temperature Monitoring ........................................................... 15 General Description ......................................................................... 1 Long-Term Stability ................................................................... 15 Pin Configurations ........................................................................... 1 Burn-In ........................................................................................ 15 Revision History ............................................................................... 2 Power Dissipation....................................................................... 15 Specifications..................................................................................... 3 Applications Information .............................................................. 16 REF01 Specifications .................................................................... 3 Basic Reference Application...................................................... 16 REF02 Specifications .................................................................... 4 Low Cost Current Source .......................................................... 16 REF03 Specifications .................................................................... 5 Precision Current Source with Adjustable Output ................ 16 Absolute Maximum Ratings............................................................ 6 Precision Boosted Output Regulator ....................................... 16 Thermal Resistance ...................................................................... 6 Bipolar Voltage Reference ......................................................... 17 ESD Caution .................................................................................. 6 Adjustable Reference With Positive and Negative Swing ..... 17 Pin Configurations and Function Descriptions ........................... 7 Outline Dimensions ....................................................................... 18 Typical Performance Characteristics ............................................. 8 REF01 Ordering Guide .............................................................. 20 Terminology .................................................................................... 13 REF02 Ordering Guide .............................................................. 20 Theory of Operation ...................................................................... 14 REF03 Ordering Guide .............................................................. 20 Input and Output Capacitors .................................................... 14 REVISION HISTORY 10/10--Rev. J to Rev. K 10/09--Rev. J: Initial Version Deleted Negative References Section and Figure 39; Renumbered Sequentially.............................................................. 16 Updated Format .................................................................. Universal Combined REF01, REF02, and REF03 Data Sheets....... Universal Changes to Absolute Maximum Input Voltage .............................6 Rev. K | Page 2 of 20 REF01/REF02/REF03 SPECIFICATIONS REF01 SPECIFICATIONS VIN = 15 V, TA = 25C, ILOAD = 0 mA, all grades, unless otherwise noted. Parameter OUTPUT VOLTAGE Symbol VO OUTPUT ADJUSTMENT RANGE 1 VTRIM INITIAL ACCURACY VOERR Conditions A and E grades H grade C grade A, E and H grades, POT = 10 k C grade, POT = 10 k A and E grades Min 9.97 9.95 9.90 3.0 2.7 Typ 10.00 10.00 10.00 3.3 3.0 H grade C grade TEMPERATURE COEFFICIENT TCVO LINE REGULATION 2 VO/VIN LOAD REGULATION2 VO/ILOAD DROPOUT VOLTAGE QUIESCENT CURRENT VDO IIN LOAD CURRENT Sourcing ILOAD Sinking SHORT CIRCUIT TO GND VOLTAGE NOISE LONG-TERM STABILITY 3 TURN-ON SETTLING TIME TEMPERATURE SENSOR 4 Voltage Output at TEMP Pin Temperature Sensitivity A and E grades, -55C TA +125C H grade, 0C TA +70C C grade, 0C TA +70C (-J and -Z packages) C grade, -40 TA +85C (-P and -S packages) A, E and H grades, VIN = 13 V to 33 V A, E and H grades, VIN = 13 V to 33 V, 0C TA +70C A, E and H grades, VIN = 13 V to 33 V, -55C TA +125C C grade, VIN = 13 V to 33 V C grade, VIN = 13 V to 30 V, 0C TA +70C (-J and -Z packages) C grade, VIN = 13 V to 30 V, -40C TA +85C (-P and -S packages) A and E grades, ILOAD = 0 mA to 10 mA A and E grades, ILOAD = 0 mA to 8 mA, 0C TA +70C A and E grades, ILOAD = 0 mA to 8 mA, -55C TA +125C H grade, ILOAD = 0 mA to 10 mA H grade, ILOAD = 0 mA to 8 mA, 0C TA +70C H grade, ILOAD = 0 mA to 8 mA, -50C TA +125C C grade, ILOAD = 0 mA to 8 mA C grade, ILOAD = 0 mA to 5 mA, 0C TA +70C (-J and -Z packages) C grade, ILOAD = 0 mA to 5 mA, -40C TA +85C (-P and -S packages) 3.0 10 20 20 60 70 90 90 110 110 50 60 90 60 70 90 60 80 80 A, E, and H grades C grade 1.0 1.0 A, E, and H grades C grade ISC eN p-p VO tR Max 10.03 10.05 10.10 30 0.3 50 0.5 100 1.0 8.5 25 65 65 100 120 150 150 180 180 80 100 150 100 120 150 150 180 180 2 1.4 1.6 10 8 -0.3 VO = 0 V 0.1 Hz to 10.0 Hz (-S, -Z and -P packages) 0.1 Hz to 10.0 Hz (-J package) After 1000 hours of operation Output settling to within 0.1% of final value VTEMP TCVTEMP 1 Unit V V V % % mV % mV % mV % ppm/C ppm/C ppm/C ppm/C ppm/V ppm/V ppm/V ppm/V ppm/V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA V mA mA 30 30 35 50 5 mA mA mA mA V p-p V p-p ppm s 580 1.96 mV mV/C Refer to the Output Adjustment section. Specification includes the effects of self-heating. 3 Long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour periods. Refer to Application Note AN-713. 4 Refer to the Temperature Monitoring section. 2 Rev. K | Page 3 of 20 REF01/REF02/REF03 REF02 SPECIFICATIONS VIN = 15 V, TA = 25C, ILOAD = 0 mA, all grades, unless otherwise noted. Nongraded refers to REF02Z. Parameter OUTPUT VOLTAGE Symbol VO OUTPUT ADJUSTMENT RANGE 1 VTRIM INITIAL ACCURACY VOERR Conditions A and E grades H grade and nongraded C grade A, E, H grades and nongraded, POT = 10 k C grade, POT = 10 k A and E grades Min 4.985 4.975 4.950 3.0 2.7 Typ 5.000 5.000 5.000 6.0 6.0 H grade and nongraded C grade TEMPERATURE COEFFICIENT TCVO LINE REGULATION 2 VO/VIN LOAD REGULATION2 VO/ILOAD DROPOUT VOLTAGE QUIESCENT CURRENT VDO IIN LOAD CURRENT Sourcing ILOAD Sinking SHORT CIRCUIT TO GND VOLTAGE NOISE LONG-TERM STABILITY 3 TURN-ON SETTLING TIME TEMPERATURE SENSOR 4 Voltage Output at TEMP Pin Temperature Sensitivity A grade and non-graded, -55C TA +125C E and H grades, 0C TA +70C C grade, 0C TA +70C (-J and -Z packages) C grade, -40 TA +85C (-P and -S packages) A, E, H grades and nongraded, VIN = 8 V to 36 V A, E, H grades and nongraded, VIN = 8 V to 36 V, 0C TA +70C A, E, H grades and nongraded, VIN = 8V to 36 V, -55C TA +125C C grade, VIN = 8 V to 36 V C grade, VIN = 8 V to 36 V, 0C TA +70C (-J and -Z packages) C grade, VIN = 8 V to 36 V,-40C TA +85C (-P and -S packages) A and E grades, ILOAD = 0 mA to 10 mA A and E grades, ILOAD = 0 mA to 8 mA, 0C TA +70C A and E grades, ILOAD = 0 mA to 8 mA, -55C TA +125C H grade and nongraded, ILOAD = 0 mA to 10 mA H grade and nongraded, ILOAD = 0 mA to 8 mA, 0C TA +70C H grade and nongraded, ILOAD = 0 mA to 8 mA, -50C TA +125C C grade, ILOAD = 0 mA to 8 mA C grade, ILOAD = 0 mA to 5 mA, 0C TA +70C (-J and -Z packages) C grade, ILOAD = 0 mA to 5 mA, -40C TA +85C (-P and -S packages) 3 10 20 20 60 70 90 90 110 110 60 60 70 60 70 90 60 80 80 A, E, H grades and nongraded C grade 1.0 1.0 A, E, H grades and nongraded C grade ISC eN p-p VO tR VO = 0 V 0.1 Hz to 10.0 Hz (-S, -Z and -P packages) 0.1 Hz to 10.0 Hz (-J package) After 1000 hours of operation Output settling to within 0.1% of final value VTEMP TCVTEMP 1 Max 5.015 5.025 5.050 15 0.3 25 0.5 50 1 8.5 25 65 65 100 120 150 150 180 180 100 100 120 100 120 150 150 180 180 2 1.4 1.6 10 8 -0.3 Unit V V V % % mV % mV % mV % ppm/C ppm/C ppm/C ppm/C ppm/V ppm/V ppm/V ppm/V ppm/V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA V mA mA 30 15 20 50 5 mA mA mA mA V p-p V p-p ppm s 580 1.96 mV mV/C Refer to the Output Adjustment section. Specification includes the effects of self-heating. 3 Long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour periods. Refer to Application Note AN-713. 4 Refer to the Temperature Monitoring section. 2 Rev. K | Page 4 of 20 REF01/REF02/REF03 REF03 SPECIFICATIONS VIN = 15 V, -40C TA +85C, ILOAD = 0 mA, unless otherwise noted. Parameter Symbol OUTPUT VOLTAGE VO OUTPUT ADJUSTMENT RANGE 1 INITIAL ACCURACY VTRIM VOERR TEMPERATURE COEFFICIENT LINE REGULATION 2 LOAD REGULATION2 DROPOUT VOLTAGE QUIESCENT CURRENT LOAD CURRENT Sourcing Sinking SHORT CIRCUIT TO GND VOLTAGE NOISE LONG-TERM STABILITY 3 TURN-ON SETTLING TIME TEMPERATURE SENSOR 4 Voltage Output at TEMP Pin Temperature Sensitivity TCVO VO/VIN VO/ILOAD VDO IIN ILOAD Conditions POT = 10 k VIN = 4.5 V to 33 V ILOAD = 0 mA to 10 mA Min Typ Max Unit 2.495 2.500 2.515 V 6 11 15 0.6 50 50 100 2 1.4 % mV % ppm/C ppm/V ppm/mA V mA 10 20 60 1.0 10 -0.3 ISC eN p-p VO tR VO = 0 V 0.1 Hz to 10.0 Hz After 1000 hours of operation Output settling to within 0.1% of final value VTEMP TCVTEMP 1 24 6 50 5 mA mA mA V p-p ppm s 580 1.96 mV mV/C Refer to the Output Adjustment section. Specification includes the effects of self-heating. 3 Long-term stability is noncumulative; the drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour periods. Refer to Application Note AN-713. 4 Refer to the Temperature Monitoring section. 2 Rev. K | Page 5 of 20 REF01/REF02/REF03 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter Input Voltage Output Short Circuit Duration Operating Temperature Range REF01A, REF02A REF01CP, REF01CS, REF01E, REF01H, REF02CP, REF02CS, REF02E, REF02H, REF03G REF01CJ Storage Temperature Range -J, -S, -Z and -RC Packages -P Package Junction Temperature Range (TJ) Lead Temperature (Soldering, 10 sec.) JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Rating 36.0 V Indefinite Table 3. Thermal Resistance Package Type 8-lead SOIC (S) 8-lead PDIP (P) 8-lead CERDIP (Z) TO-99 (J) -55C to +125C -40C to +85C 0C to +70C -65C to +150C -65C to +125C -65C to +150C 300C ESD CAUTION 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. Rev. K | Page 6 of 20 JA 130 110 162 170 JC 43 50 26 24 Unit C/W C/W C/W C/W REF01/REF02/REF03 NC 1 REF01/ REF02/ REF03 VIN 2 TEMP 3 8 NC 7 NC 6 VOUT TOP VIEW 5 TRIM (Not to Scale) GND 4 00375-004 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. 8-Lead PDIP (P-Suffix), 8-Lead CERDIP (Z-Suffix), 8-Lead SOIC (S-Suffix) Pin Configuration Table 4. Pin Function Descriptions--PDIP, CERDIP, and SOIC Packages Pin No. 1, 7, 8 2 3 4 5 6 Mnemonic NC VIN TEMP GND TRIM VOUT Description No Internal Connection. Leave floating or tied to ground in actual application. Supply Voltage Input. Temperature (Band Gap) Output. Refer to the Temperature Monitoring section. Ground Connection. Output Voltage Trim. Refer to the Output Adjustment section. Reference Voltage Output. NC 8 7 NC NC 1 REF01/ REF02/ REF03 VIN 2 NC 3 6 VOUT 5 TRIM 00375-005 4 GROUND (CASE) Figure 5. 8-Lead TO-99 (J-Suffix) Pin Configuration Table 5. Pin Function Descriptions--8-Lead TO-99 Package NC NC NC Description No Internal Connection. Leave floating or tied to ground in actual application. Supply Voltage Input. Ground Connection. Output Voltage Trim. Refer to the Output Adjustment section. Reference Voltage Output. NC 3 2 1 20 19 NC 4 18 NC VIN 5 17 NC REF01/ REF02 NC 6 TEMP 7 16 NC TOP VIEW (Not to Scale) NC NC TRIM 10 11 12 13 NC 9 GND NC 8 15 VOUT 14 NC 00375-006 Mnemonic NC VIN GND TRIM VOUT NC Pin No. 1, 3, 7, 8 2 4 5 6 Figure 6. 20-Terminal LCC (RC-Suffix) Pin Configuration Table 6. Pin Function Descriptions--20-Terminal LCC Package Terminal No. 1 to4, 6, 8, 9, 11, 13, 14, 16 to 20 5 7 10 12 15 Mnemonic NC Description No Internal Connection. Leave floating or tied to ground in actual application. VIN TEMP GND TRIM VOUT Supply Voltage Input. Temperature (Band Gap) Output. Refer to the Temperature Monitoring section. Ground Connection. Output Voltage Trim. Refer to the Output Adjustment section. Reference Voltage Output. Rev. K | Page 7 of 20 REF01/REF02/REF03 TYPICAL PERFORMANCE CHARACTERISTICS 0.8 10.010 SUPPLY CURRENT (mA) VOUT (V) 10.005 10.000 9.995 0.7 +125C 0.6 +25C -40C 0.5 0.4 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 12 00375-007 5.008 0.8 5.004 0.7 SUPPLY CURRENT (mA) 24 28 INPUT VOLTAGE (V) 32 36 40 5.000 4.996 +125C +25C 0.6 -40C 0.5 0.4 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 8 00375-008 -25 12 16 20 24 28 32 36 40 00375-011 VOUT (V) 20 Figure 10. REF01 Supply Current vs. Input Voltage Figure 7. REF01 Typical Output Voltage vs. Temperature 4.992 -40 16 40 00375-012 9.985 -40 00375-010 9.990 INPUT VOLTAGE (V) Figure 8. REF02 Typical Output Voltage vs. Temperature Figure 11. REF02 Supply Current vs. Input Voltage 0.85 2.502 0.80 0.75 SUPPLY CURRENT (mA) 2.500 2.499 0.70 +125C 0.65 +25C 0.60 0.55 -40C 0.50 0.45 2.498 -40 0.40 -25 -10 5 20 35 50 65 80 95 110 TEMPERATURE (C) 125 00375-009 VOUT (V) 2.501 Figure 9. REF03 Typical Output Voltage vs. Temperature 5 10 15 20 25 30 35 INPUT VOLTAGE (V) Figure 12. REF03 Supply Current vs. Input Voltage Rev. K | Page 8 of 20 REF01/REF02/REF03 40 2 IL = 0mA TO 10mA VIN = 14V TO 36V 0 VIN = 36V LINE REGULATION (ppm/V) 20 10 0 VIN = 14V -10 -20 -2 -4 -6 -8 -30 0 50 25 85 125 TEMPERATURE (C) -10 -40 00375-013 -40 -40 -25 -10 5 20 35 50 65 80 110 95 125 TEMPERATURE (C) 00375-016 LOAD REGULATION (ppm/mA) 30 Figure 16. REF01 Line Regulation vs. Temperature Figure 13. REF01 Load Regulation vs. Temperature 50 8 IL = 0mA TO 5mA VIN = 8V TO 36V LINE REGULATION (ppm/V) LOAD REGULATION (ppm/mA) 40 30 VIN = 36V 20 10 0 VIN = 8V 4 0 -4 -40 0 85 25 125 TEMPERATURE (C) -8 -40 00375-014 -20 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 00375-017 -10 Figure 17. REF02 Line Regulation vs. Temperature Figure 14. REF02 Load Regulation vs. Temperature 60 4 IL = 0mA TO 10mA VIN = 5V TO 36V LINE REGULATION (ppm/mV) VIN = 7V 40 VIN = 36V 30 20 2 0 -2 0 -40 -25 -10 5 20 35 50 65 80 95 110 TEMPERATURE (C) 125 Figure 15. REF03 Load Regulation vs. Temperature -4 -40 -25 -10 5 20 35 50 65 80 95 110 TEMPERATURE (C) Figure 18. REF03 Line Regulation vs. Temperature Rev. K | Page 9 of 20 125 00375-018 10 00375-015 LOAD REGULATION (ppm/mA) 50 REF01/REF02/REF03 5 0.70 TA = 25C QUIESCENT CURRENT (mA) 3 +125C 2 -40C 1 0.65 0.60 0.55 +25C 0 2 4 6 8 10 LOAD CURRENT (mA) 00375-019 0.50 0 0 2 4 6 8 10 LOAD CURRENT (mA) 00375-022 DROPOUT VOLTAGE (V) 4 Figure 22. REF01 Quiescent Current vs. Load Current Figure 19. REF01 Dropout Voltage vs. Load Current 4 1V/DIV DROPOUT VOLTAGE (V) 6 +125C -40C 2 0 2 4 8 6 10 LOAD CURRENT (mA) TIME (1s/DIV) 00375-020 0 00375-023 +25C Figure 23. REF02 Typical Low-Frequency Voltage Noise (0.1 Hz to 10.0 Hz) Figure 20. REF02 Dropout Voltage vs. Load Current 6 50V/DIV 4 +125C 3 +25C 2 -40C 0 0 2 4 6 8 LOAD CURRENT (mA) 10 TIME (1ms/DIV) 00375-024 1 00375-021 DROPOUT VOLTAGE (V) 5 Figure 24. REF02 Typical Wideband Voltage Noise (10 Hz to 10 kHz) Figure 21. REF03 Dropout Voltage vs. Load Current Rev. K | Page 10 of 20 REF01/REF02/REF03 10V 8V VIN 10V/DIV VOUT 5V/DIV CIN = 0.01F NO LOAD CAPACITOR VOUT 5V/DIV TIME (2ms/DIV) 00375-028 00375-025 NO LOAD CAPACITOR NO INPUT CAPACITOR TIME (4s/DIV) Figure 25. REF02 Line Transient Response Figure 28. REF02 Turn-Off Response CIN = 0.01F NO LOAD CAPACITOR NO LOAD CAPACITOR VIN 10V/DIV VIN 5V/DIV LOAD OFF LOAD ON TIME (1ms/DIV) 00375-026 LOAD = 5mA 00375-029 VOUT 5V/DIV VOUT 100mV/DIV TIME (4s/DIV) Figure 29. REF02 Turn-On Response Figure 26. REF02 Load Transient Response CLOAD = 100nF VIN 10V/DIV VIN 5V/DIV CL = 0.01F NO INPUT CAPACITOR LOAD OFF LOAD ON TIME (1ms/DIV) TIME (4s/DIV) Figure 27. REF02 Load Transient Response Figure 30. REF02 Turn-Off Response (No Input Capacitor) Rev. K | Page 11 of 20 00375-030 LOAD = 5mA VOUT 5V/DIV 00375-027 VOUT 100mV/DIV REF01/REF02/REF03 0.80 CL = 0.01F NO INPUT CAPACITOR 0.75 VIN 10V/DIV VIN = 15V SAMPLE SIZE = 5 0.70 VTEMP (V) 0.65 0.60 VTEMP /T 1.96mV/C 0.55 VOUT 5V/DIV 0.50 0.40 -50 -25 0 25 50 75 100 TEMPERATURE (C) Figure 32. Output Voltage at TEMP Pin vs. Temperature Figure 31. REF02 Turn-Off Response (No Input Capacitor) Rev. K | Page 12 of 20 125 00375-032 TIME (4s/DIV) 00375-031 0.45 REF01/REF02/REF03 TERMINOLOGY Dropout Voltage (VDO) Dropout voltage, sometimes referred to as supply voltage headroom or supply-output voltage differential, is defined as the minimum voltage differential between the input and output necessary for the device to operate. VDO = (VIN - VOUT )min VOUT _ LTD = VOUT (t 1 ) - VOUT (t 0 )[V ] IL = constant VOUT _ LTD = Since the dropout voltage depends upon the current passing through the device, it is always specified for a given load current. Temperature Coefficient (TCVO) The temperature coefficient relates the change in output voltage to the change in ambient temperature of the device, as normalized by the output voltage at 25C. This parameter is expressed in ppm/C and can be determined by the following equation: TCVOUT = Long-Term Stability (VOUT_LTD) Long-term stability refers to the shift in output voltage at 25C after 1000 hours of operation in a 25C environment. This may also be expressed as either a shift in voltage or a difference in ppm from the nominal output. VOUT (T2 ) - VOUT (T1 ) VOUT (25 o C )x (T2 - T1 ) [ x 10 6 ppm/ o C ] where: VOUT(25C) is output voltage at 25C. VOUT(T1) is output voltage at temperature 1. VOUT(T2) is output voltage at temperature 2. Thermally Induced Output Voltage Hysteresis (VOUT_HYS) Thermally induced output voltage hysteresis represents the change in output voltage after the device is exposed to a specified temperature cycle. This may be expressed as either a shift in voltage or a difference in ppm from the nominal output. VOUT (25 o C ) - VOUT _ TC VOUT (25 o C ) VOUT (t 0 ) x 10 6 [ppm] where: VOUT(t0) is VOUT at 25C at time 0. VOUT(t1) is VOUT at 25C after 1000 hours of operation at 25C. Line Regulation Line regulation refers to the change in output voltage in response to a given change in input voltage. It is expressed in either percent per volt, ppm per volt, or microvolt per volt change in input voltage. This parameter accounts for the effects of self-heating. Load Regulation Load regulation refers to the change in output voltage in response to a given change in load current, and is expressed in either microvolts per milliamp, ppm per milliamp, or ohms of DC output resistance. This parameter accounts for the effects of self-heating. VOUT _ HYS = VOUT (25 o C ) - VOUT _ TC [V ] VOUT _ HYS = VOUT (t 1 ) - VOUT (t 0 ) x 10 6 [ppm ] where: VOUT(25C)is output voltage at 25C. VOUT_TC is output voltage after temperature cycling. Thermal hysteresis occurs mainly as a result of forces exhibited upon the internal die by its packaging. The effect is more pronounced in parts with smaller packages. Rev. K | Page 13 of 20 REF01/REF02/REF03 THEORY OF OPERATION REF01, REF02, and REF03 are high precision, low drift 10.0 V, 5.0 V, and 2.5 V voltage references available in a variety of packages. These devices are standard band gap references (see Figure 33). The band gap cell contains two NPN transistors (Q18 and Q19) that differ in emitter area by a factor of 2. The difference in the VBE values of these transistors produces a proportional-to-absolute temperature current (PTAT) through R14, and, when combined with the VBE of Q19, produces a band gap voltage, VBG, that is almost constant over temperature. While the REF0x series of references are designed to function stably without any external components, connecting a 0.1 F ceramic capacitor to the output is highly recommended to improve stability and filter out low level voltage noise. An additional 1 F to 10 F electrolytic, tantalum, or ceramic capacitor can be added in parallel to improve transient performance in response to sudden changes in load current; however, the designer should keep in mind that doing so increases the turn-on time of the device. With an internal op amp and the feedback network created by R5 and R6, VO is set precisely at 10.0 V, 5.0 V, or 2.5 V. Precision laser trimming of various resistors and other proprietary circuit techniques are used to further enhance the initial accuracy, temperature curvature, and drift performance of the device. A 1 F to 10 F electrolytic, tantalum, or ceramic capacitor can also be connected to the input to improve transient response in applications where the supply voltage may fluctuate. An additional 0.1 F ceramic capacitor should be connected in parallel to reduce supply noise. The PTAT voltage is brought out directly from the band gap, unbuffered, at the TEMP pin. Since this voltage output has a stable 1.96 mV/C temperature coefficient, users can estimate the temperature change of the device by simply monitoring the change in voltage at this pin. Both input and output capacitors should be mounted as close to the device pins as possible. VIN R1 R2 R4 R3 Q23 Q1 Q2 Q7 Q8 Q9 Q3 D1 Q10 The REF0x trim terminal can be used to adjust the output up or down from the internally trimmed, nominal output voltage. This feature allows the system designer to trim out system errors due to changes in line and load conditions, thermal hysteresis, output offset due to solder reflow, or other error sources. The basic trim circuit configuration is shown in Figure 35. Table 7 also lists the range of output voltages obtainable from each model in this configuration. D2 VO Q4 OUTPUT ADJUSTMENT U1 C1 Q12 R13 R12 Q13 REF01/ REF02/ REF03 R5 I1 VIN R20 TRIM Q14 Q15 R27 TEMP Q16 R14 Q20 R6 R24 R42 R41 R11 GND Figure 33. REF0x Simplified Schematic INPUT AND OUTPUT CAPACITORS Figure 34 shows the basic input/output capacitor configuration for the REF0x series of references. U1 REF01/ REF02/ REF03 C1 0.1F VIN VOUT TEMP TRIM GND Figure 35. Optional Trim Adjustment Circuit Table 7. Adjustment Range Using Trim Circuit Model REF01 REF02 REF03 VO C2 0.1F VOUT, Low Limit 9.70 V 4.95 V 2.3 V VOUT, High Limit 10.05 V 5.02 V 2.8 V Adjustment of the output does not significantly affect the temperature performance of the reference itself, provided the temperature coefficients of the resistors used are low. 00375-034 VIN R1 470k POT 10k R2 1k Q17 R32 R17 VO VOUT TEMP TRIM GND VBG 1x Q19 00375-033 2x Q18 VIN 00375-035 D3 Figure 34. Basic REF0x Capacitor Configuration Rev. K | Page 14 of 20 REF01/REF02/REF03 In addition to the optional TRIM function, the REF0x series of references provides the ability to monitor changes in temperature by way of tracking the voltage present at the TEMP pin. The output voltage of this pin is taken directly from the band gap core and, as a result, varies linearly with temperature. The nominal voltage at the TEMP pin (VTEMP) is approximately 550 mV at 25C, with a temperature coefficient (TCVTEMP) of approximately 1.96 mV/C. Refer to Figure 32 for a graph of output voltage vs. temperature. As an example, given these ideal values, a voltage change of 39.2 mV at the TEMP pin corresponds to a 20C change in temperature. The TEMP function is provided as a convenience, rather than a precise feature, of the reference. In addition, because the voltage at the TEMP pin is taken directly from the band gap core, any current injected into or pulled from this pin has a significant effect on VOUT. As such, even tens of microamps drawn from the TEMP pin can cause the output to fall out of regulation. Should the designer wish to take advantage of this feature, it is necessary to buffer the output of the TEMP pin with a low bias current op amp, such as the AD8601 or AD8641. Any of these op amps, if used as shown in Figure 36, causes less than a 100 V change in VOUT. It is important to understand that long-term stability is not guaranteed by design, and that the output from the device may shift beyond the typical 50 ppm specification at any time, especially during the first 200 hours of operation. For systems that require highly stable output over long periods of time, the designer should consider burning-in the devices prior to use to minimize the amount of output drift exhibited by the reference over time. Refer to the AN-713 Application Note for more information regarding the effects of long-term drift and how it can be minimized. BURN-IN Burn-in, wherein the part is powered and allowed to operate normally for an extended period of time, can be useful for minimizing the effects of long-term drift. A sample burn-in circuit is shown below in Figure 37. +18V + 10 VIN REF01/ REF02/ REF03 VOUT + U1 V+ VTEMP 1.9mV/C AD8641 VOUT The part may be burned in with or without a constant resistive load. The load current should not exceed 10 mA. VO POWER DISSIPATION TEMP TRIM GND V- 00375-036 U2 VIN 10F Figure 37. Burn-In Circuit REF01/ REF02/ REF03 VIN RL OPTIONAL GND -18V 15V 10F 00375-037 TEMPERATURE MONITORING Figure 36. Temperature Monitoring LONG-TERM STABILITY One of the key parameters of the REF0x series of references is long-term stability. Regardless of output voltage, internal testing during development showed a typical drift of approximately 50 ppm after 1,000 hours of continuous, nonloaded operation in a +25C environment. The REF0x series of voltage references are capable of sourcing up to 10 mA of load current at room temperature across the rated input voltage range. However, when used in applications subject to high ambient temperatures, the input voltage and load current should be carefully monitored to ensure that the device does not exceeded its maximum power dissipation rating. The maximum power dissipation of the device can be calculated via the following equation: PD = T j - TA JA [W] where: PD is device power dissipation. Tj is device junction temperature. TA is ambient temperature. JA is package (junction-to-air) thermal resistance. Because of this relationship, acceptable load current in hightemperature conditions may be less than the maximum current-sourcing capability of the device. In no case should the part be operated outside of its maximum power rating as doing so may result in premature failure or permanent damage to the device. Rev. K | Page 15 of 20 REF01/REF02/REF03 APPLICATIONS INFORMATION BASIC REFERENCE APPLICATION Figure 38 shows the basic configuration for any REF0x device. Input and output capacitance values can be tailored for performance, provided they follow the guidelines described in the Input and Output Capacitors section. PRECISION CURRENT SOURCE WITH ADJUSTABLE OUTPUT A higher-precision current source can be implemented with the circuit shown in Figure 40. U1 U1 REF02 REF01/ REF02/ REF03 C2 0.1F B AD5201 TEMP TRIM GND VO TEMP TRIM GND 0V TO (5V + VL) W 100k A +12V RSET V+ OP1177 Figure 38. Basic Reference Application V- -5V TO VL VL LOW COST CURRENT SOURCE Unlike most references, the quiescent current of the REF0x series remains constant with respect to the load current (refer to Figure 22). As a result, a simple, low cost current source can be constructed by configuring the reference as shown in Figure 39. VIN IIN IL = VREF x D R SET [A ] where D is the decimal equivalent of the digital potentiometer input code. VL IQ 0.6mA A dual-supply op amp should be used since the ground potential of REF02 can swing from -5.0 V to VL while the potentiometer is swung from zero-scale to full-scale. IL = ISET + IQ 00375-040 RL IL By adding a mechanical or digital potentiometer, this circuit becomes an adjustable current source. If a digital potentiometer is used, the load current is simply the voltage across terminal B to terminal W of the digital potentiometer divided by the value of the resistor RSET. ISET = (VOUT - VL)/RSET GND 1k Figure 40. Programmable 0 mA to 5 mA Current Source VOUT RSET RL -12V PRECISION BOOSTED OUTPUT REGULATOR Figure 39. Simple Current Source In this configuration, the current through the resistor RSET (ISET) is equal to (VOUT - VL)/RSET. IL is simply the sum of ISET and IQ. However, since IQ typically varies from 0.55 mA to 0.65 mA, this circuit should be limited to low precision, general-purpose applications. The output current sourcing capability of the REF0x series can be boosted by using an external op amp and MOSFET, as shown in Figure 41. N1 VIN U1 REF01/ REF02/ REF03 VIN VOUT TEMP TRIM GND 2N7002 RL 200 CL 1F VO 15V R1 100 R2 100 V+ OP1177 V- U2 C1 1000pF 00375-042 REF01/ REF02/ REF03 1k U2 00375-041 C1 0.1F VOUT VOUT 00375-038 VIN VIN VIN +12V Figure 41. Precision Boosted Output Regulator In this circuit, U2 forces VO to VREF by regulating the current through N1, thereby sourcing the load current directly from the input voltage source connected at VIN. Using the components shown, this circuit can source up to 50 mA with an input voltage of 15.0 V. The circuit's current sourcing capability can be further increased by replacing N1 with a higher-power MOSFET. Rev. K | Page 16 of 20 REF01/REF02/REF03 BIPOLAR VOLTAGE REFERENCE Many applications require both a positive and reference voltage of the same magnitude. A simple method of generating such a bipolar reference is shown in Figure 42. V+ 2 VIN VOUT REF03 GND 6 +2.5V The output voltage of the REF0x references can be readily adjusted via a simple trim circuit (explained in the Output Adjustment section). The circuit shown in Figure 43 extends the negative range of adjustment beyond that obtainable with the simple trim circuit by employing a precision op amp with a potentiometer feeding the op amp's noninverting input. V+ 100k U1 100k 2 50k VIN 4 VOUT U2 3 7 OP97 6 4 V- REF03 -2.5V 50k 4 Figure 42. Bipolar Voltage Reference In this configuration, the negative rail is generated simply with an inverting amplifier with a gain of -1. A low offset op amp should be used to minimize the voltage error at the negative output. 50k 2 3 7 +15V 6 OP97 4 U2 VOUT -2.5V TO +2.5V GND 00375-043 2 6 V+ 00375-044 U1 ADJUSTABLE REFERENCE WITH POSITIVE AND NEGATIVE SWING Figure 43. Negatively Adjustable Reference The voltage output from the op amp can be adjusted by changing the value of the potentiometer: as shown, the op amp outputs +2.5 V when the pot is pulled completely high, and -2.5V when pulled completely low. In this configuration, the load current is sourced by the op amp; therefore, a low offset op amp with a current rating that meets or exceeds the current requirements of the load should be used. Rev. K | Page 17 of 20 REF01/REF02/REF03 OUTLINE DIMENSIONS 0.005 (0.13) MIN 0.055 (1.40) MAX 8 5 0.310 (7.87) 0.220 (5.59) 1 4 0.100 (2.54) BSC 0.320 (8.13) 0.290 (7.37) 0.405 (10.29) MAX 0.060 (1.52) 0.015 (0.38) 0.200 (5.08) MAX 0.150 (3.81) MIN 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) SEATING PLANE 0.070 (1.78) 0.030 (0.76) 0.015 (0.38) 0.008 (0.20) 15 0 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 44. 8-Lead Ceramic Dual In-Line Package [CERDIP] Z-Suffix (Q-8) Dimensions shown in inches and (millimeters) REFERENCE PLANE 0.1850 (4.70) 0.1650 (4.19) 0.5000 (12.70) MIN 0.2500 (6.35) MIN 0.0500 (1.27) MAX 0.1000 (2.54) BSC 0.1600 (4.06) 0.1400 (3.56) 0.3350 (8.51) 0.3050 (7.75) 0.3700 (9.40) 0.3350 (8.51) 5 6 4 0.2000 (5.08) BSC 3 7 2 0.0400 (1.02) MAX 0.0400 (1.02) 0.0100 (0.25) 0.1000 (2.54) BSC 0.0190 (0.48) 0.0160 (0.41) 0.0210 (0.53) 0.0160 (0.41) 8 0.0450 (1.14) 0.0270 (0.69) 1 0.0340 (0.86) 0.0280 (0.71) 45 BSC . COMPLIANT TO JEDEC STANDARDS MO-002-AK CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 45. 8-Pin Metal Header Package [TO-99] J-Suffix (H-08) Dimensions shown in inches and (millimeters) Rev. K | Page 18 of 20 022306-A BASE & SEATING PLANE REF01/REF02/REF03 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 1 4 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.100 (2.54) BSC 0.060 (1.52) MAX 0.210 (5.33) MAX 0.015 (0.38) MIN 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX 0.005 (0.13) MIN 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 070606-A COMPLIANT TO JEDEC STANDARDS MS-001 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. Figure 46. 8-Lead Plastic Dual In-Line Package [PDIP] Narrow Body, P-Suffix (N-8) Dimensions shown in inches and (millimeters) 0.200 (5.08) REF 0.100 (2.54) REF 0.015 (0.38) MIN 0.075 (1.91) REF 0.095 (2.41) 0.075 (1.90) 19 18 0.358 (9.09) 0.342 (8.69) SQ 0.358 (9.09) MAX SQ 0.011 (0.28) 0.007 (0.18) R TYP 0.075 (1.91) REF 0.088 (2.24) 0.054 (1.37) 3 20 4 0.028 (0.71) 0.022 (0.56) 1 BOTTOM VIEW 0.055 (1.40) 0.045 (1.14) 0.050 (1.27) BSC 8 14 13 9 45 TYP 0.150 (3.81) BSC 022106-A 0.100 (2.54) 0.064 (1.63) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 47. 20-Terminal Ceramic Leadless Chip Carrier [LCC] RC-Suffix (E-20-1) Dimensions shown in inches and (millimeters) 5.00 (0.1968) 4.80 (0.1890) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 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-A A 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. Figure 48. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body, S-Suffix (R-8) Dimensions shown in millimeters and (inches) Rev. K | Page 19 of 20 012407-A 8 4.00 (0.1574) 3.80 (0.1497) REF01/REF02/REF03 REF01 ORDERING GUIDE Model 1, 2 REF01AJ/883C REF01CJ REF01EZ REF01HZ REF01CPZ REF01HPZ REF01CS REF01CS-REEL REF01CS-REEL7 REF01CSZ REF01CSZ-REEL REF01CSZ-REEL7 1 2 Initial Accuracy (mV) 30 100 30 50 100 50 100 100 100 100 100 100 Temperature Range -55C to +125C 0C to 70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 8-Pin TO-99 8-Pin TO-99 8-Lead CERDIP 8-Lead CERDIP 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N Package Option J-Suffix (H-08) J-Suffix (H-08) Z-Suffix (Q-8) Z-Suffix (Q-8) P-Suffix (N-8) P-Suffix (N-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) Temperature Range -55C to +125C -55C to +125C -55C to +125C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -55C to +125C Package Description 8-Pin TO-99 8-Lead CERDIP 8-Lead CERDIP 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead CERDIP 8-Lead CERDIP 8-Lead PDIP 8-Lead SOIC_N 20-Terminal LCC 8-Lead CERDIP Package Option J-Suffix (H-08) Z-Suffix (Q-8) Z-Suffix (Q-8) P-Suffix (N-8) P-Suffix (N-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) S-Suffix (R-8) Z-Suffix (Q-8) Z-Suffix (Q-8) P-Suffix (N-8) S-Suffix (R-8) RC-Suffix (E-20-1) Z-Suffix (Q-8) Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N Package Option N-8 (P-Suffix) R-8 (P-Suffix) R-8 (P-Suffix) R-8 (P-Suffix) Contact sales for 883 data sheet. Z = RoHS Compliant Part. REF02 ORDERING GUIDE Model 1, 2 REF02AJ/883C REF02AZ REF02AZ/883C REF02CP REF02CPZ REF02CS REF02CS-REEL REF02CS-REEL7 REF02CSZ REF02CSZ-REEL REF02CSZ-REEL7 REF02EZ REF02HZ REF02HPZ REF02HSZ REF02RC/883 REF02Z 1 2 Initial Accuracy (mV) 15 15 15 50 50 50 50 50 50 50 50 15 25 25 25 25 25 Contact sales for 883 data sheet. Z = RoHS Compliant Part. REF03 ORDERING GUIDE Model 1 REF03GPZ REF03GSZ REF03GSZ-REEL REF03GSZ-REEL7 1 Initial Accuracy (mV) 15 15 15 15 Z = RoHS Compliant Part. (c)2000-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00375-0-10/10(K) Rev. K | Page 20 of 20