Precision Low Drift 2.048 V/2.500 V SOT-23 Voltage Reference ADR380/ADR381 PIN CONFIGURATION Initial accuracy: 5 mV/6 mV maximum Initial accuracy error: 0.24%/0.24% Low TCVOUT: 25 ppm/C maximum Load regulation: 70 ppm/mA Line regulation: 25 ppm/V Wide operating ranges 2.4 V to 18 V for ADR380 2.8 V to 18 V for ADR381 Low power: 120 A maximum High output current: 5 mA Wide temperature range: -40C to +85C Tiny 3-lead SOT-23 package with standard pinout VIN 1 ADR380/ ADR381 3 GND TOP VIEW VOUT 2 (Not to Scale) 02175-001 FEATURES Figure 1. 3-Lead SOT-23 (RT Suffix) APPLICATIONS Battery-powered instrumentation Portable medical instruments Data acquisition systems Industrial process control systems Hard disk drives Automotive GENERAL DESCRIPTION The ADR380 and ADR381 are precision 2.048 V and 2.500 V band gap voltage references featuring high accuracy, high stability, and low power consumption in a tiny footprint. Patented temperature drift curvature correction techniques minimize nonlinearity of the voltage change with temperature. The wide operating range and low power consumption make them ideal for 3 V to 5 V battery-powered applications. Table 1. ADR38x Products Part Number Nominal Output Voltage (V) ADR380 ADR381 2.048 2.500 The ADR380 and ADR381 are micropower, low dropout voltage (LDV) devices that provide a stable output voltage from supplies as low as 300 mV above the output voltage. They are specified over the industrial (-40C to +85C) temperature range. The ADR380/ADR381 are available in the tiny 3-lead SOT-23 package. Rev. B 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)2001-2009 Analog Devices, Inc. All rights reserved. ADR380/ADR381 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 11 Applications ....................................................................................... 1 Device Power Dissipation Considerations .............................. 11 Pin Configuration ............................................................................. 1 Input Capacitor ........................................................................... 11 General Description ......................................................................... 1 Output Capacitor........................................................................ 11 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications..................................................................................... 3 Stacking Reference ICs for Arbitrary Outputs ....................... 12 ADR380 Electrical Characteristics............................................. 3 ADR381 Electrical Characteristics............................................. 4 A Negative Precision Reference Without Precision Resistors ....................................................................................................... 12 Absolute Maximum Ratings............................................................ 5 Precision Current Source .......................................................... 12 Thermal Resistance ...................................................................... 5 Precision High Current Voltage Source .................................. 13 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 14 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 14 Terminology .................................................................................... 10 REVISION HISTORY 1/09--Rev. A to Rev. B Updated Format .................................................................. Universal Changes to Table 7 ............................................................................ 5 Changes to Stacking Reference ICs for Arbitrary Outputs Section, Figure 28, and Figure 29 ................................................. 12 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 14 7/04--Rev. 0 to Rev. A Updated Format .................................................................. Universal Changes to Ordering Guide .......................................................... 16 Updated Outline Dimensions ....................................................... 16 Rev. B | Page 2 of 16 ADR380/ADR381 SPECIFICATIONS ADR380 ELECTRICAL CHARACTERISTICS VIN = 5.0 V, TA = 25C, unless otherwise noted. Table 2. Parameter Output Voltage Initial Accuracy Error Symbol VOUT VOERR Conditions Temperature Coefficient TCVOUT Minimum Supply Voltage Headroom Line Regulation Load Regulation VIN - VOUT VOUT/DVIN VOUT/DILOAD Quiescent Current IIN Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit to GND eN tR VOUT VOUT_HYS RRR ISC -40C < TA < +85C 0C < TA< 70C ILOAD 3 mA VIN = 2.5 V to 15 V, -40C < TA < +85C VIN = 3 V, ILOAD = 0 mA to 5 mA, -40C < TA < +85C No load -40C < TA < +85C 0.1 Hz to 10 Hz Min 2.043 -5 -0.24 Typ 2.048 5 3 300 10 100 Max 2.053 +5 +0.24 25 21 25 70 120 140 A A V p-p s ppm ppm dB mA 5 20 50 40 85 25 1000 Hrs fIN = 60 Hz Unit V mV % ppm/C ppm/C mV ppm/V ppm/mA VIN = 15.0 V, TA = 25C, unless otherwise noted. Table 3. Parameter Symbol Output Voltage Initial Accuracy Error VOUT VOERR Temperature Coefficient TCVOUT Minimum Supply Voltage Headroom Line Regulation Load Regulation VIN - VOUT VOUT/DVIN VOUT/DILOAD Quiescent Current IIN Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit to GND eN tR VOUT VOUT_HYS RRR ISC Conditions -40C < TA < +85C 0C < TA < 70C ILOAD 3 mA VIN = 2.5 V to 15 V, -40C < TA < +85C VIN = 3 V, ILOAD = 0 mA to 5 mA, -40C < TA < +85C No load -40C < TA < +85C 0.1 Hz to 10 Hz 1000 Hrs fIN = 60 Hz Rev. B | Page 3 of 16 Min Typ Max Unit 2.043 -5 -0.24 2.048 2.053 +5 +0.24 25 21 V mV % ppm/C ppm/C mV ppm/V ppm/mA 5 3 300 10 100 5 20 50 40 85 25 25 70 120 140 A A V p-p s ppm ppm dB mA ADR380/ADR381 ADR381 ELECTRICAL CHARACTERISTICS VIN = 5.0 V, TA = 25C, unless otherwise noted. Table 4. Parameter Symbol Output Voltage Initial Accuracy Error VOUT VOERR Temperature Coefficient TCVOUT Minimum Supply Voltage Headroom Line Regulation Load Regulation VIN - VOUT VOUT/DVIN VOUT/DILOAD Quiescent Current IIN Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit to GND eN tR VOUT VOUT_HYS RRR ISC Conditions Min Typ Max Unit 2.494 -6 -0.24 2.500 2.506 +6 +0.24 25 21 V mV % ppm/C ppm/C mV ppm/V ppm/mA -40C < TA < +85C 0C < TA < 70C ILOAD 2 mA VIN = 2.8 V to 15 V, -40C < TA < +85C VIN = 3.5 V, ILOAD = 0 mA to 5 mA, -40C < TA < +85C No load -40C < TA < +85C 0.1 Hz to 10 Hz 5 3 300 10 100 25 70 120 140 A A V p-p s ppm ppm dB mA 5 20 50 75 85 25 1000 Hrs fIN = 60 Hz VIN = 5.0 V, TA = 25C, unless otherwise noted. Table 5. Parameter Symbol Output Voltage Initial Accuracy Error VOUT VOERR Temperature Coefficient TCVOUT Minimum Supply Voltage Headroom Line Regulation Load Regulation VIN - VOUT VOUT/DVIN VOUT/DILOAD Quiescent Current IIN Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit to GND eN tR VOUT VOUT_HYS RRR ISC Conditions -40C < TA < +85C 0C < TA < 70C ILOAD 2 mA VIN = 2.8 V to 15 V, -40C < TA < +85C VIN = 3.5 V, ILOAD = 0 mA to 5 mA, -40C < TA < +85C No load -40C < TA < +85C 0.1 Hz to 10 Hz 1000 Hrs fIN = 60 Hz Rev. B | Page 4 of 16 Min Typ Max Unit 2.494 -6 -0.24 2.500 2.506 +6 +0.24 25 21 V mV % ppm/C ppm/C mV ppm/V ppm/mA 5 3 300 10 100 5 20 50 75 85 25 25 70 120 140 A A V p-p s ppm ppm dB mA ADR380/ADR381 ABSOLUTE MAXIMUM RATINGS Table 6. 1 Parameter Supply Voltage Output Short-Circuit Duration to GND VIN > 15 V VIN 15 V Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 Sec) 1 Rating 18 V 10 sec Indefinite -65C to +150C -40C to +85C -65C to +150C 300C Absolute maximum ratings apply at 25C, unless otherwise noted. 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. THERMAL RESISTANCE JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 7. Package Type 3-Lead SOT-23 (RT) ESD CAUTION Rev. B | Page 5 of 16 JA 333 Unit C/W ADR380/ADR381 TYPICAL PERFORMANCE CHARACTERISTICS 2.054 60 2.052 50 TEMPERATURE +25C -40C +85C +25C SAMPLE 1 40 SAMPLE 2 FREQUENCY 2.048 SAMPLE 3 2.046 10 35 TEMPERATURE (C) 60 85 0 -15 -13 -11 -9 -7 -5 -3 -1 1 3 PPM (C) 02175-002 -15 Figure 2. ADR380 Output Voltage vs. Temperature 2.504 120 SUPPLY CURRENT (A) 140 SAMPLE 1 2.500 SAMPLE 2 2.498 7 9 11 13 15 Figure 5. ADR381 Output Voltage Temperature Coefficient 2.506 2.502 5 02175-005 10 2.042 -40 SAMPLE 3 2.496 +85C +25C 100 80 -40C 60 40 20 -15 10 35 TEMPERATURE (C) 60 85 0 2.5 02175-003 2.494 -40 Figure 3. ADR381 Output Voltage vs. Temperature 5.0 7.5 10.0 INPUT VOLTAGE (V) 12.5 15.0 02175-006 VOUT (V) 30 20 2.044 Figure 6. ADR380 Supply Current vs. Input Voltage 140 30 TEMPERATURE +25C -40C +85C +25C 120 SUPPLY CURRENT (A) 25 20 TOTAL NUMBER OF DEVICES = 130 15 10 5 0 -11 -9 -7 -5 -3 -1 +85C +25C 100 80 -40C 60 40 20 1 3 5 7 PPM (C) 9 11 13 15 17 19 0 2.5 02175-004 FREQUENCY TOTAL NUMBER OF DEVICES IN SAMPLE = 450 Figure 4. ADR380 Output Voltage Temperature Coefficient 5.0 7.5 10.0 INPUT VOLTAGE (V) 12.5 Figure 7. ADR381 Supply Current vs. Input Voltage Rev. B | Page 6 of 16 15.0 02175-007 VOUT (V) 2.050 ADR380/ADR381 5 70 ILOAD = 0mA TO 5mA VIN = 2.8V TO 15V 50 LINE REGULATION (ppm/V) LOAD REGULATION (ppm/mA) 60 VIN = 3V 40 30 VIN = 5V 20 4 3 2 1 -15 10 35 TEMPERATURE (C) 60 85 0 -40 02175-008 0 -40 Figure 8. ADR380 Load Regulation vs. Temperature -15 10 35 TEMPERATURE (C) 60 85 02175-011 10 Figure 11. ADR381 Line Regulation vs. Temperature 70 0.8 ILOAD = 5mA DIFFERENTIAL VOLTAGE (V) LOAD REGULATION (ppm/mA) 60 VIN = 3.5V 50 40 VIN = 5V 30 20 0.6 +85C -40C 0.4 +25C 0.2 -15 10 35 TEMPERATURE (C) 60 85 0 02175-009 0 -40 Figure 9. ADR381 Load Regulation vs. Temperature 0 1 2 3 LOAD CURRENT (mA) 4 5 02175-012 10 Figure 12. ADR380 Minimum Input/Output Differential Voltage vs. Load Current 0.8 5 DIFFERENTIAL VOLTAGE (V) 4 3 2 1 0.6 +85C 0.4 +25C 0.2 0 -40 -15 10 35 TEMPERATURE (C) 60 85 0 Figure 10. ADR380 Line Regulation vs. Temperature 0 1 2 3 LOAD CURRENT (mA) 4 5 02175-013 -40C 02175-010 LINE REGULATION (ppm/V) VIN = 2.5V TO 15V Figure 13. ADR381 Minimum Input/Output Differential Voltage vs. Load Current Rev. B | Page 7 of 16 ADR380/ADR381 60 TEMPERATURE +25C -40C +85C +25C CBYPASS = 0F 50 VOUT FREQUENCY 40 1V/DIV 2 30 LINE INTERRUPTION 20 1 VIN 0.5V/DIV 0.5V/DIV 02175-017 0 -260 -200 -140 -80 -20 40 100 160 220 280 340 400 HYSTERESIS (ppm) 02175-014 10 TIME (10s/DIV) Figure 17. ADR381 Line Transient Response Figure 14. ADR381 VOUT Hysteresis CBYPASS = 0.1F VOUT 2V/DIV 2 1V/DIV 1 LINE INTERRUPTION 0.5V/DIV 0.5V/DIV 02175-018 TIME (1s/DIV) 02175-015 1 TIME (10s/DIV) Figure 15. ADR381 Typical Noise Voltage, 0.1 Hz to 10 Hz Figure 18. ADR381 Line Transient Response CL = 0F VOUT 100V/DIV 1V/DIV 2 1 LOAD OFF VLOAD ON 1 2V/DIV Figure 16. ADR381 Typical Noise Voltage, 10 Hz to 10 kHz TIME (200s/DIV) Figure 19. ADR381 Load Transient Response with CL = 0 F Rev. B | Page 8 of 16 02175-019 TIME (10ms/DIV) 02175-016 ILOAD = 1mA ADR380/ADR381 CBYPASS = 0.1F CL = 1nF VOUT CL = 40pF ZOUT (10/DIV) 1V/DIV 2 LOAD OFF VLOAD ON 1 CL = 0.1F CL = 1F 2V/DIV TIME (200s/DIV) 10 100 1k 10k FREQUENCY (Hz) 100k 1M 02175-023 02175-020 ILOAD = 1mA Figure 23. ADR381 Output Impedance vs. Frequency Figure 20. ADR381 Load Transient Response with CL = 1 nF 150 CL = 100nF 100 VOUT 50 DRIFT (ppm) 1V/DIV 2 LOAD OFF 0 -50 1 2V/DIV -100 ILOAD = 1mA CONDITIONS: VIN = 6V IN A CONTROLLED ENVIRONMENT 50C 1C -150 02175-021 TIME (200s/DIV) 0 100 Figure 21. ADR381 Load Transient Response with CL = 100 nF 200 300 400 500 600 HOURS 700 800 900 1000 02175-024 VLOAD ON Figure 24. ADR380 Long-Term Drift 150 RL = 500 50 DRIFT (ppm) VOUT 2 100 2V/DIV 0 -50 VIN 1 5V/DIV -100 Figure 22. ADR381 Turn-On/Turn-Off Response at 5 V -150 0 100 200 300 400 500 600 HOURS 700 800 Figure 25. ADR381 Long-Term Drift Rev. B | Page 9 of 16 900 1000 02175-025 TIME (200s/DIV) 02175-022 CONDITIONS: VIN = 6V IN A CONTROLLED ENVIRONMENT 50C 1C ADR380/ADR381 TERMINOLOGY Temperature Coefficient The change of output voltage over the operating temperature change and normalized by the output voltage at 25C, expressed in ppm/C. The equation follows: TCVOUT [ppm/C] VOUT (T2 ) VOUT (T1 ) VOUT (25C) (T2 T1 ) Long-Term Stability A typical shift in output voltage over 1000 hours at a controlled temperature. Figure 24 and Figure 25 show a sample of parts measured at different intervals in a controlled environment of 50C for 1000 hours. 106 VOUT VOUT (t 0 ) VO UT (t 1 ) VO UT [ppm] where: VOUT (25C) = VOUT at 25C. VOUT (T1) = VOUT at Temperature 1. VOUT (T2) = VOUT at Temperature 2. Line Regulation The change in output voltage due to a specified change in input voltage. It includes the effects of self-heating. Line regulation is expressed in either percent per volt, parts-per-million per volt, or microvolts per volt change in input voltage. Load Regulation The change in output voltage due to a specified change in load current. It includes the effects of self-heating. Load regulation is expressed in either microvolts per milliampere, parts-per-million per milliampere, or ohms of dc output resistance. VOUT (t 0 ) VOUT (t 1 ) VO UT (t 0 ) 10 6 where: VOUT (t0) = VOUT at Time 0. VOUT (t1) = VOUT after 1000 hours of operation at a controlled temperature. Note that 50C was chosen because most applications run at a higher temperature than 25C. Thermal Hysteresis The change of output voltage after the device is cycled through temperature from +25C to -40C to +85C and back to +25C. This is a typical value from a sample of parts put through such a cycle. VOUT _ HYS VOUT (25C) VOUT _ TC VOUT _ HYS [ppm] VOUT (25C) VOUT _ TC VOUT (25C) 106 where: VOUT (25C) = VOUT at 25C. VOUT_TC = VOUT at 25C after a temperature cycle from +25C to -40C to +85C and back to +25C. Rev. B | Page 10 of 16 ADR380/ADR381 THEORY OF OPERATION Band gap references are the high performance solution for low supply voltage and low power voltage reference applications, and the ADR380/ADR381 are no exception. However, the uniqueness of this product lies in its architecture. As shown in Figure 26, the ideal zero TC band gap voltage is referenced to the output, not to ground. The band gap cell consists of the PNP pair Q51 and Q52, running at unequal current densities. The difference in VBE results in a voltage with a positive TC that is amplified by the ratio of 2 x R58/R54. This PTAT voltage, combined with the VBE of Q51 and Q52, produce the stable band gap voltage. Reduction in the band gap curvature is performed by the ratio of the two resistors, R44 and R59. Precision laser trimming and other patented circuit techniques are used to further enhance the drift performance. VIN Q1 VOUT R49 - Q51 R53 Q52 TJ TA JA where: PD is the device power dissipation, TJ and TA are junction and ambient temperatures, respectively. JA is the device package thermal resistance. OUTPUT CAPACITOR R48 R60 R61 GND Figure 26. Simplified Schematic 02175-026 + PD An input capacitor is not required on the ADR380/ADR381. There is no limit for the value of the capacitor used on the input, but a capacitor on the input improves transient response in applications where the load current suddenly increases. R58 R54 The ADR380/ADR381 are capable of delivering load currents to 5 mA with an input voltage that ranges from 2.8 V (ADR381 only) to 15 V. When this device is used in applications with large input voltages, take care to avoid exceeding the specified maximum power dissipation or junction temperature that may result in premature device failure. Use the following formula to calculate a device's maximum junction temperature or dissipation: INPUT CAPACITOR R44 R59 DEVICE POWER DISSIPATION CONSIDERATIONS The ADR380/ADR381 do not need an output capacitor for stability under any load condition. Using an output capacitor, typically 0.1 F, removes any very low level noise voltage and does not affect the operation of the part. The only parameter that degrades by applying an output capacitor is turn-on time. (This varies depending on the size of the capacitor.) Load transient response is also improved with an output capacitor, which acts as a source of stored energy for a sudden increase in load current. Rev. B | Page 11 of 16 ADR380/ADR381 APPLICATIONS INFORMATION STACKING REFERENCE ICs FOR ARBITRARY OUTPUTS Some applications may require two reference voltage sources, which are a combined sum of standard outputs. The following circuit shows how this stacked output reference can be implemented: VOUT 2 VOUT2 The circuit in Figure 28 avoids the need for tightly matched resistors with the use of an active integrator circuit. In this circuit, the output of the voltage reference provides the input drive for the integrator. The integrator, to maintain circuit equilibrium, adjusts its output to establish the proper relationship between the reference VOUT and GND. Thus, any negative output voltage desired can be chosen by substituting for the appropriate reference IC. A precaution should be noted with this approach: although rail-to-rail output amplifiers work best in the application, these operational amplifiers require a finite amount (mV) of headroom when required to provide any load current. The choice for the circuit's negative supply should take this issue into account. U2 ADR380/ ADR381 C1 0.1F C2 1F GND 3 1 VOUT VIN 2 VOUT1 U1 C3 0.1F ADR380/ ADR381 C4 1F R1 3.9k 02175-027 GND 3 Figure 27. Stacking Voltage References with the ADR380/ADR381 Two ADR380s or ADR381s are used; the outputs of the individual references are simply cascaded to reduce the supply current. Such configuration provides two output voltages: VOUT1 and VOUT2. VOUT1 is the terminal voltage of U1, while VOUT2 is the sum of this voltage and the terminal voltage of U2. U1 and U2 can be chosen for the two different voltages that supply the required outputs. While this concept is simple, a precaution is in order. Because the lower reference circuit must sink a small bias current from U2, plus the base current from the series PNP output transistor in U2, the external load of either U1 or R1 must provide a path for this current. If the U1 minimum load is not well-defined, Resistor R1 should be used, set to a value that conservatively passes 600 A of current with the applicable VOUT1 across it. Note that the two U1 and U2 reference circuits are locally treated as macrocells, each having its own bypasses at input and output for optimum stability. Both U1 and U2 in this circuit can source dc currents up to their full rating. The minimum input voltage, VIN, is determined by the sum of the outputs, VOUT2, plus the 300 mV dropout voltage of U2. 1 V IN VIN C1 1F C2 0.1F R4 1k VOUT 2 C4 1F U1 ADR380/ ADR381 GND +5V R3 100k C3 1F 3 U2 A1 +V -V R5 100 -VREF OP195 02175-028 VIN -5V Figure 28. Negative Precision Voltage Reference Using No Precision Resistors PRECISION CURRENT SOURCE Many times in low power applications, the need arises for a precision current source that can operate on low supply voltages. As shown in Figure 29, the ADR380/ADR381 can be configured as a precision current source. The circuit configuration illustrated is a floating current source with a grounded load. The reference output voltage is bootstrapped across RSET (R1 + P1), which sets the output current into the load. With this configuration, circuit precision is maintained for load currents in the range from the reference supply current, typically 90 A to approximately 5 mA. C1 1F A NEGATIVE PRECISION REFERENCE WITHOUT PRECISION RESISTORS 1 VIN C2 0.1F VIN VOUT U1 ADR380/ ADR381 GND 3 In many current-output CMOS DAC applications where the output signal voltage must be of the same polarity as the reference voltage, it is often required to reconfigure a currentswitching DAC into a voltage-switching DAC through the use of a 1.25 V reference, an op amp, and a pair of resistors. Using a current switching DAC directly requires an additional operational amplifier at the output to reinvert the signal. A negative voltage reference is then desirable from the point that an additional operational amplifier is not required for either reinversion Rev. B | Page 12 of 16 2 C3 1F ISY ADJUST R1 P1 IOUT RL Figure 29. Precision Current Source 02175-029 1 VIN (current-switching mode) or amplification (voltage-switching mode) of the DAC output voltage. In general, any positive voltage reference can be converted into a negative voltage reference through the use of an operational amplifier and a pair of matched resistors in an inverting configuration. The disadvantage to this approach is that the largest single source of error in the circuit is the relative matching of the resistors used. ADR380/ADR381 VIN R1 100k In some cases, the user may want higher output current delivered to a load and still achieve better than 0.5% accuracy from the ADR380/ADR381. The accuracy for a reference is normally specified on the data sheet with no load. However, the output voltage changes with load current. The circuit in Figure 30 provides high current without compromising the accuracy of the ADR380/ADR381. By op amp action, VOUT follows VREF with very low drop in R1. To maintain circuit equilibrium, the op amp also drives the N-Channel MOSFET Q1 into saturation to maintain the current needed at different loads. R2 is optional to prevent oscillation at Q1. In such an approach, hundreds of milliamps of load current can be achieved, and the current is limited by the thermal limitation of Q1. VIN = VOUT + 300 mV. 8V TO 15V 1 VIN VOUT U1 ADR380/ ADR381 2 +V A1 -V AD820 C1 0.001F Q1 2N7002 R2 100 VOUT RL GND 3 Figure 30. ADR380/ADR381 for Precision High Current Voltage Source Rev. B | Page 13 of 16 02175-030 PRECISION HIGH CURRENT VOLTAGE SOURCE ADR380/ADR381 OUTLINE DIMENSIONS 3.04 2.90 2.80 1.40 1.30 1.20 2.64 2.10 3 1 2 0.60 0.45 2.05 1.78 1.02 0.95 0.88 1.03 0.89 1.12 0.89 0.100 0.013 0.54 REF GAUGE PLANE 0.180 0.085 0.25 0.60 MAX 0.30 MIN 011909-C 0.51 0.37 SEATING PLANE COMPLIANT TO JEDEC STANDARDS TO-236-AB Figure 31. 3-Lead Small Outline Transistor Package [SOT-23-3] (RT-3) Dimensions shown in millimeters 1.55 1.50 1.45 2.05 2.00 1.95 1.10 1.00 0.90 8.30 8.00 7.70 3.55 3.50 3.45 3.20 3.10 2.90 1.00 MIN 7" REEL 100.00 OR 13" REEL 330.00 1.10 1.00 0.90 0.35 0.30 0.25 2.80 2.70 2.60 1.50 MIN 20.20 MIN 14.40 MIN 7" REEL 50.00 MIN OR 13" REEL 100.00 MIN 13.20 13.00 12.80 0.75 MIN 9.90 8.40 6.90 DIRECTION OF UNREELING 053006-0 4.10 4.00 3.90 Figure 32. Tape and Reel Dimensions Dimensions shown in millimeters ORDERING GUIDE Model ADR380ARTZ-REEL71 ADR381ART-REEL7 ADR381ARTZ-R21 ADR381ARTZ-REEL71 1 2 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 Package Option RT-3 RT-3 RT-3 RT-3 Z = RoHS Compliant Part, # denotes RoHS compliant product may be top or bottom marked. Prior to Date Code 0542, parts were branded with R2A without the #. Rev. B | Page 14 of 16 Branding R2D2 R3A R3A R3A# Output Voltage 2.048 2.500 2.500 2.500 Ordering Quantity 3,000 3,000 250 3,000 ADR380/ADR381 NOTES Rev. B | Page 15 of 16 ADR380/ADR381 NOTES (c)2001-2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D02175-0-1/09(B) Rev. B | Page 16 of 16