High Precision Shunt Mode Voltage References ADR520/ADR525/ADR530/ADR540/ADR550 PIN CONFIGURATION Ultracompact SC70 and SOT-23 packages Temperature coefficient: 40 ppm/°C (max) 2× the tempco improvement over the LM4040 Pin compatible with LM4040/LM4050 Initial accuracy: ±0.2% Low output voltage noise: 14 µV p-p @ 2.5 V output No external capacitor required Operating current range: 50 µA to 10 mA Industrial temperature range: −40°C to +85°C APPLICATIONS Part ADR520A ADR520B ADR525A ADR525B ADR530A ADR530B ADR540A ADR540B ADR550A ADR550B 3 V– 2 TRIM ADR540/ ADR550 Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23 (RT) Designed for space-critical applications, the ADR520/ADR525/ ADR530/ADR540/ADR550 are high precision shunt voltage references, housed in ultrasmall SC70 and SOT-23 packages. These references feature low temperature drift of 40 ppm/°C, an initial accuracy of better than 0.2%, and ultralow output noise of 14 µV p-p. Table 1. Selection Guide Initial Accuracy (%) ±0.4 ±0.2 ±0.4 ±0.2 ±0.4 ±0.2 ±0.4 ±0.2 ±0.4 ±0.2 ADR520/ ADR525/ ADR530/ GENERAL DESCRIPTION Portable, battery-powered equipment Automotive Power supplies Data acquisition systems Instrumentation and process control Energy measurement Voltage (V) 2.048 2.048 2.5 2.5 3.0 3.0 4.096 4.096 5.0 5.0 V+ 1 04501-0-001 FEATURES Temperature Coeffecient (ppm/°C) 70 40 70 40 70 40 70 40 70 40 Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V, and 5.0 V, the ADR5xx’s advanced design eliminates the need for compensation by an external capacitor, yet the references are stable with any capacitive load. The minimum operating current increases from a mere 50 µA to a maximum of 10 mA. This low operating current and ease of use make these references ideally suited for handheld, battery-powered applications. A TRIM terminal is available on the ADR5xx to allow adjustment of the output voltage over a ±0.5% range, without affecting the temperature coefficient of the device. This feature provides users with the flexibility to trim out any system errors. Rev. A 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: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved. ADR520/ADR525/ADR530/ADR540/ADR550 TABLE OF CONTENTS Specifications..................................................................................... 3 Theory of Operation ...................................................................... 11 Absolute Maximum Ratings............................................................ 6 Applications ................................................................................ 11 Parameter Definitions ...................................................................... 7 Outline Dimensions ....................................................................... 13 Typical Performance Characteristics ............................................. 8 Ordering Guide............................................................................... 14 REVISION HISTORY 11/03—Revision 0: Initial Version 12/03—Data Sheet Changed from REV. 0 to REV. A Updated Outline Dimensions ....................................................... 13 Change to Ordering Guide............................................................ 14 Rev. A | Page 2 of 16 ADR520/ADR525/ADR530/ADR540/ADR550 SPECIFICATIONS Table 2. ADR520 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted Parameter Output Voltage Grade A Grade B Initial Accuracy Grade A Grade B Temperature Coefficient1 Grade A Grade B Output Voltage Change vs. IIN Dynamic Output Impedance Minimum Operating Current Voltage Noise Turn-On Settling Time Output Voltage Hysteresis Symbol VO Conditions Min Typ Max Unit 2.040 2.044 2.048 2.048 2.056 2.052 V V +8 +4 mV mV 70 40 1 4 ppm/°C ppm/°C mV mV 2 0.27 mV Ω µA µV p-p µs ppm VOERR TCVO ±0.4% ±0.2% –40°C < TA < +85°C –8 –4 25 15 ∆VR (∆VR/∆IR) IIN eN p-p tR ∆VO_HYS IIN = 0.1 mA to 10 mA –40°C < TA < +85°C IIN = 1 mA to 10 mA –40°C < TA < +85°C IIN = 0.1 mA to10 mA –40°C < TA < +85°C 0.1 Hz to 10 Hz 50 14 2 40 IIN = 1 mA 1 Guaranteed by design Table 3. ADR525 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted Parameter Output Voltage Grade A Grade B Initial Accuracy Grade A Grade B Temperature Coefficient1 Grade A Grade B Output Voltage Change vs. IIN Dynamic Output Impedance Minimum Operating Current Voltage Noise Turn-On Settling Time Output Voltage Hysteresis 1 Symbol VO Conditions Min Typ Max Unit 2.490 2.495 2.500 2.500 2.510 2.505 V V +10 +5 mV mV 70 40 1 4 ppm/°C ppm/°C mV mV 2 0.2 mV Ω µA µV p-p µs ppm VOERR TCVO ±0.4% ±0.2% –40°C < TA < +85°C –10 –5 25 15 ∆VR (∆VR/∆IR) IIN eN p-p tR ∆VO_HYS IIN = 0.1 mA to 10 mA –40°C < TA < +85°C IIN = 1 mA to 10 mA –40°C < TA < +85°C IIN = 0.1 mA to 10 mA –40°C < TA < +85°C 0.1 Hz to 10 Hz IIN = 1 mA Guaranteed by design Rev. A | Page 3 of 16 50 14 2 40 ADR520/ADR525/ADR530/ADR540/ADR550 Table 4. ADR530 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted Parameter Output Voltage Grade A Grade B Initial Accuracy Grade A Grade B Temperature Coefficient1 Grade A Grade B Output Voltage Change vs. IIN Dynamic Output Impedance Minimum Operating Current Voltage Noise Turn-On Settling Time Output Voltage Hysteresis Symbol VO Conditions Min Typ Max Unit 2.988 2.994 3.000 3.000 3.012 3.006 V V +12 +6 mV mV 70 40 1 4 ppm/°C ppm/°C mV mV 2 0.2 mV Ω µA µV p-p µs ppm VOERR TCVO ±0.4% ±0.2% –40°C < TA < +85°C –12 –6 25 15 ∆VR (∆VR/∆IR) IIN eN p-p tR ∆VO_HYS IIN = 0.1 mA to 10 mA –40°C < TA < +85°C IIN = 1 mA to 10 mA –40°C < TA < +85°C IIN = 0.1 mA to 10 mA –40°C < TA < +85°C 0.1 Hz to 10 Hz 50 16 2 40 IIN = 1 mA 1 Guaranteed by design Table 5. ADR540 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted Parameter Output Voltage Grade A Grade B Initial Accuracy Grade A Grade B Temperature Coefficient1 Grade A Grade B Output Voltage Change vs. IIN Dynamic Output Impedance Minimum Operating Current Voltage Noise Turn-On Settling Time Output Voltage Hysteresis Symbol VO Conditions Min Typ Max Unit 4.08 4.088 4.096 4.096 4.112 4.104 V V +16 +8 mV mV 70 40 1 5 ppm/°C ppm/°C mV mV 2 0.2 mV Ω µA µV p-p µs ppm VOERR TCVO ±0.4% ±0.2% –40°C < TA < +85°C –16 –8 25 15 ∆VR (∆VR/∆IR) IIN eN p-p tR ∆VO_HYS IIN = 0.1 mA to 10 mA –40°C < TA < +85°C IIN = 1 mA to 10 mA –40°C < TA < +85°C IIN = 0.1 mA to 10 mA –40°C < TA < +85°C 0.1 Hz to 10 Hz IIN = 1 mA 1 Guaranteed by design Rev. A | Page 4 of 16 50 18 2 40 ADR520/ADR525/ADR530/ADR540/ADR550 Table 6. ADR550 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted Parameter Output Voltage Grade A Grade B Initial Accuracy Grade A Grade B Temperature Coefficient1 Grade A Grade B Output Voltage Change vs. IIN Dynamic Output Impedance Minimum Operating Current Voltage Noise Turn-On Settling Time Output Voltage Hysteresis Symbol VO Conditions Min Typ Max Unit 4.980 4.090 5.000 5.000 5.020 5.010 V V +20 +10 mV mV 70 40 1 5 ppm/°C ppm/°C mV mV 2 0.2 mV Ω µA µV p-p µs ppm VOERR TCVO ±0.4% ±0.2% –40°C < TA < +85°C –20 –10 25 15 ∆VR (∆VR/∆IR) IIN eN p-p tR ∆VO_HYS IIN = 0.1 mA to 10 mA –40°C < TA < +85°C IIN = 1 mA to 10 mA –40°C < TA < +85°C IIN = 0.1 mA to 10 mA –40°C < TA < +85°C 0.1 Hz to 10 Hz IIN = 1 mA 1 Guaranteed by design Rev. A | Page 5 of 16 50 18 2 40 ADR520/ADR525/ADR530/ADR540/ADR550 ABSOLUTE MAXIMUM RATINGS Ratings apply at 25°C, unless otherwise noted. Table 7. Parameter Reverse Current Forward Current Storage Temperature Range Industrial Temperature Range Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) Rating 25 mA 20 mA –65°C to +150°C –40°C to +85°C –65°C to +150°C 300°C Package Type θJA1 θJC Unit 3-Lead SC70 (KS) 3-Lead SOT-23 (RT) 376 230 146 °C/W °C/W 1 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 listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. θJA is specified for worst-case conditions, i.e., θJA is specified for devices soldered on circuit boards for surface-mount packages. Contact factory for latest information on release dates. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. A | Page 6 of 16 ADR520/ADR525/ADR530/ADR540/ADR550 PARAMETER DEFINITIONS TEMPERATURE COEFFICIENT THERMAL HYSTERESIS Temperature coefficient is defined as the change in output voltage with respect to operating temperature changes, and is normalized by an output voltage of 25°C. This parameter is expressed in ppm/°C, and is determined by the following equation: Thermal hysteresis is defined as the change in output voltage after the device is cycled through temperatures ranging from +25°C to –40°C, then to +85°C, and back to +25°C. The following equation expresses a typical value from a sample of parts put through such a cycle: VO (T2 ) − VO (T1 ) ppm ⎤ = × 106 TCVO ⎡⎢ ⎣ °C ⎥⎦ VO (25°C ) × (T2 − T1 ) VO _ HYS = VO (25°C ) − VO _ TC (1) VO _ HYS [ppm] = VO (25°C ) − VO _ TC where: VO(25°C) = VO at 25°C. VO(T1) = VO at Temperature 1. VO(T2) = VO at Temperature 2. VO (25°C ) × 10 6 where: VO(25°C) = VO at 25°C. VO_TC = VO at 25°C after a temperature cycle from +25°C to –40°C, then to +85°C, and back to +25°C. Rev. A | Page 7 of 16 (2) ADR520/ADR525/ADR530/ADR540/ADR550 TYPICAL PERFORMANCE CHARACTERISTICS 5.5 8 4.5 REVERSE VOLTAGE (V) ADR540 4.0 3.5 ADR530 3.0 ADR525 2.5 ADR520 2.0 1.5 TA = 25°C 04501-0-006 1.0 0.5 0 0 25 50 75 7 6 5 4 3 TA = –40°C 1 0 100 TA = +85°C TA = +25°C 2 04501-0-009 REFERENCE VOLTAGE CHANGE (mV) ADR550 5.0 0 3 6 MINIMAL OPERATING CURRENT (µA) 9 12 15 IIN (mA) Figure 5. ADR550 Reverse Voltage vs. Operating Current Figure 2. Reverse Characteristics and Minimum Operating Current 7 VIN = 2V/DIV TA = +25°C 6 5 TA = +85°C 4 TA = –40°C VOUT = 1V/DIV 3 1 0 0 3 9 6 12 4µs/DIV IIN = 10mA 15 04501-0-010 2 04501-0-007 REFERENCE VOLTAGE CHANGE (mV) 8 TIME (µs) IIN (mA) Figure 6. ADR525 Turn-On Response Figure 3. ADR520 Reverse Voltage vs. Operating Current VIN = 2V/DIV 6 TA = –40°C 4 VOUT = 1V/DIV 2 TA = +25°C TA = +85°C –2 0 3 9 6 12 4µs/DIV IIN = 100µA 15 TIME (µs) IIN (mA) Figure 7. ADR525 Turn-On Response Figure 4. ADR525 Reverse Voltage vs. Operating Current Rev. A | Page 8 of 16 04501-0-011 0 04501-0-008 REVERSE VOLTAGE CHANGE (mV) 8 ADR520/ADR525/ADR530/ADR540/ADR550 VIN = 2V/DIV VIN = 2V/DIV VOUT = 1V/DIV 20µs/DIV IIN = 100µA TIME (µs) 04501-0-015 4µs/DIV IIN = 10mA 04501-0-012 VOUT = 2V/DIV TIME (µs) Figure 8. ADR520 Turn-On Response Figure 11. ADR550 Turn-On Response PEAK-TO-PEAK 13.5µV VIN = 2V/DIV RMS 2.14µV 04501-0-021 10µs/DIV IIN = 100µA 04501-0-013 VOUT = 1V/DIV 5µs/DIV TIME (µs) TIME (µs) Figure 9. ADR520 Turn-On Response Figure 12. ADR520 Noise Voltage 0.1 Hz to 10 Hz VIN = 2V/DIV V GEN = 2V/DIV IIN = 10mA VOUT = 50mV/DIV 04501-0-017 4µs/DIV IIN = 10mA 04501-0-014 VOUT = 2V/DIV 10µs/DIV TIME (µs) TIME (µs) Figure 10. ADR550 Turn-On Response Figure 13. ADR525 Load Transient Response Rev. A | Page 9 of 16 ADR520/ADR525/ADR530/ADR540/ADR550 3.0055 3.0050 V GEN = 2V/DIV IIN = 10mA 3.0045 3.0040 VOUT (V) 3.0035 VOUT = 50mV/DIV 3.0030 3.0025 3.0020 3.0015 04501-0-019 3.0010 04501-0-017 10µs/DIV 3.0005 3.0000 –40 TIME (µs) –15 10 35 60 85 TEMPERATURE (°C) Figure 16. ADR530 VOUT over Temperature 5.008 2.5025 5.006 2.5020 5.004 2.5015 5.002 2.5010 5.000 VOUT (V) 2.5030 2.5005 2.5000 4.998 4.994 2.4990 4.992 2.4985 2.4980 –40 –15 10 35 TEMPERATURE (°C) 60 85 Figure 15. ADR525 VOUT over Temperature 04501-0-020 4.996 2.4995 04501-0-018 VOUT (V) Figure 14. ADR550 Load Transient Response 4.990 4.988 –40 –15 10 35 TEMPERATURE (°C) 60 Figure 17. ADR550 VOUT over Temperature Rev. A | Page 10 of 16 85 ADR520/ADR525/ADR530/ADR540/ADR550 THEORY OF OPERATION The RBIAS must be large enough so that IIN does not exceed 10 mA when the supply voltage is at its maximum value and the load current is at its minimum value. Given these conditions, the RBIAS is determined by the supply voltage (VCC), the ADR5xx load and operating current (IL and IQ), and the ADR5xx output voltage (VOUT). RBIAS = VCC − VOUT I L − I IN (3) VS RBIAS IIN + IL VOUT IIN IL ADR550 Figure 19. Shunt Reference Precision Negative Voltage Reference V+ + • 04501-0-003 The ADR520/ADR525/ADR530/ADR540/ADR550 use the band gap concept to produce a stable, low temperature coefficient voltage reference suitable for high accuracy data acquisition components and systems. The devices use the physical nature of a silicon transistor base-emitter voltage in the forward-biased operating region. All such transistors have approximately a –2 mV/°C temperature coefficient (TC), making them unsuitable for direct use as a low temperature coefficient reference. Extrapolation of the temperature characteristic of any one of these devices to absolute zero (with the collector current proportional to the absolute temperature), however, reveals that its VBE approaches approximately the silicon band gap voltage. Thus, if a voltage develops with an opposing temperature coefficient to sum the VBE, a zero temperature coefficient reference results. The ADR5xx circuit shown in Figure 18 provides such a compensating voltage (V1) by driving two transistors at different current densities and amplifying the resultant VBE difference (∆VBE, which has a positive temperature coefficient). The sum of VBE and V1 provides a stable voltage reference over temperature. The ADR5xx is suitable for applications where a precise negative voltage is desired. Figure 20 shows the ADR5xx configured to provide a negative output. V1 – + ADR525 ∆VBE –2.5V – V– VCC Figure 18. Circuit Schematic 04501-0-004 VBE RBIAS 04501-0-002 + – Figure 20. Negative Precision Reference Configuration APPLICATIONS Output Voltage Trim The ADR520/ADR525/ADR530/ADR540/ADR550 are a series of precision shunt voltage references. They are designed to operate without an external capacitor between the positive and negative terminals. If a bypass capacitor is used to filter the supply, the references remains stable. The ADR5xx TRIM terminal can be used to adjust the output voltage over a range of ±0.5%. This allows systems designers to trim system errors by setting the reference to a voltage other than the preset output voltage. An external mechanical or electrical potentiometer can be used for this adjustment. Figure 21 illustrates how the output voltage can be trimmed by using the AD5273, an Analog Devices 10 kΩ potentiometer. • The RBIAS must be small enough to supply the minimum IIN current to the ADR5xx, even when the supply voltage is at its minimum value and the load current is at its maximum value. Rev. A | Page 11 of 16 VCC VOUT RBIAS ADR530 R1 470kΩ AD5273 POTENTIOMETER 10kΩ 04501-0-005 All shunt voltage references require an external bias resistor (RBIAS) between the supply voltage and the reference (see Figure 19). The RBIAS sets the current that flows through the load (IL) and the reference (IIN). Because the load and the supply voltage can vary, the RBIAS needs to be chosen based on the following considerations: Figure 21. Output Voltage Trim ADR520/ADR525/ADR530/ADR540/ADR550 Stacking ADR5xx for User-Definable Outputs Adjustable Precision Voltage Source Multiple ADR5xx parts can be stacked together to allow the user to obtain a desired higher voltage. Figure 22a shows three ADR550s configured to give 15 V. The bias resistor, RBIAS, is chosen using Equation 3, noting that the same bias current will flow through all the shunt references in series. Figure 22b shows three ADR550s stacked together to give –15 V. RBIAS is calculated in the same manner as before. Parts of different voltages can also be added together, i.e., an ADR525 and an ADR550 can be added together to give an output of +7.5 V or –7.5 V, as desired. Note, however, that the initial accuracy error is now the sum of the errors of all the stacked parts, as are the tempco and output voltage change versus input current. The ADR5xx, combined with a precision low input bias op amp, such as the AD8610, can be used to output a precise adjustable voltage. Figure 23 illustrates the implementation of this application using the ADR5xx. The output of the op amp, VOUT, is determined by the gain of the circuit, which is completely dependant on the resistors, R1 and R2. VOUT = (1 + R2/R1)VREF An additional capacitor, C1, in parallel with R2, can be added to filter out high frequency noise. The value of C1 is dependent on the value of R2. VCC +VDD GND VREF AD8610 VOUT = VREF (1+R2/R1) R GND –VDD (a) (b) ADR5xx R2 R1 GND Figure 22. 15 V Output with Stacked ADR550s C1 (OPTIONAL) Figure 23. Adjustable Voltage Source Rev. A | Page 12 of 16 04501-0-023 –15V 04501-0-022 +15V ADR550 ADR550 ADR550 RBIAS ADR550 ADR550 ADR550 R ADR520/ADR525/ADR530/ADR540/ADR550 OUTLINE DIMENSIONS 2.20 1.80 1.35 1.15 3 1 2.40 1.80 2 PIN 1 0.65 BSC 1.00 0.80 1.10 MAX 0.18 0.10 0.40 0.25 0.10 MAX SEATING PLANE 0.30 0.10 0.10 COPLANARITY Figure 24. Surface-Mount Package [SC70] (KS-3) Dimensions shown in millimeters 3.04 2.90 2.80 1.40 1.30 1.20 3 1 2.64 2.10 2 PIN 1 0.95 BSC 1.90 BSC 1.12 0.89 0.10 0.01 SEATING PLANE 0.50 0.30 0.60 0.50 0.40 COMPLIANT TO JEDEC STANDARDS TO-236AB Figure 25. Surface-Mount Package[SOT-23] (RT-3) Dimensions shown in millimeters Rev. A | Page 13 of 16 0.20 0.08 ADR520/ADR525/ADR530/ADR540/ADR550 ORDERING GUIDE Model Output Voltage (V) Initial Accuracy (mV) Tempco Industrial (ppm/°C) Package Description Package Option ADR520ART-REEL7 ADR520ART-R2 ADR520BRT-REEL7 ADR520BRT-R2 ADR520BKS-REEL7 ADR520BKS-R2 ADR525ART-REEL7 ADR525ART-R2 ADR525BRT-REEL7 ADR525BRT-R2 ADR525BKS-REEL7 ADR525BKS-R2 ADR530ART-REEL7 ADR530ART-R2 ADR530BRT-REEL7 ADR530BRT-R2 ADR530BKS-REEL7 ADR530BKS-R2 ADR540ART-REEL7 ADR540ART-R2 ADR540BRT-REEL7 ADR540BRT-R2 ADR540BKS-REEL7 ADR540BKS-R2 ADR550ART-REEL7 ADR550ART-R2 ADR550BRT-REEL7 ADR550BRT-R2 ADR550BKS-REEL7 ADR550BKS-R2 2.048 2.048 2.048 2.048 2.048 2.048 2.500 2.500 2.500 2.500 2.500 2.500 3.0 3.0 3.0 3.0 3.0 3.0 4.096 4.096 4.096 4.096 4.096 4.096 5.0 5.0 5.0 5.0 5.0 5.0 8 8 4 4 4 4 10 10 5 5 5 5 12 12 6 6 6 6 16 16 8 8 8 8 20 20 10 10 10 10 70 70 40 40 40 40 70 70 40 40 40 40 70 70 40 40 40 40 70 70 40 40 40 40 70 70 40 40 40 40 SOT-23 SOT-23 SOT-23 SOT-23 SC70 SC70 SOT-23 SOT-23 SOT-23 SOT-23 SC70 SC70 SOT-23 SOT-23 SOT-23 SOT-23 SC70 SC70 SOT-23 SOT-23 SOT-23 SOT-23 SC70 SC70 SOT-23 SOT-23 SOT-23 SOT-23 SC70 SC70 RT RT RT RT KS KS RT RT RT RT KS KS RT RT RT RT KS KS RT RT RT RT KS KS RT RT RT RT KS KS Rev. A | Page 14 of 16 Branding Number of Parts per Reel Temperature Range (°C) RQA RQA RQB RQB RQB RQB RRA RRA RRB RRB RRB RRB RSA RSA RSB RSB RSB RSB RTA RTA RTB RTB RTB RTB RVA RVA RVB RVB RVB RVB 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 3,000 250 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 –40 to +85 ADR520/ADR525/ADR530/ADR540/ADR550 NOTES Rev. A | Page 15 of 16 ADR520/ADR525/ADR530/ADR540/ADR550 NOTES © 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C04501–0–12/03(A) Rev. A | Page 16 of 16