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ANALOG DEVICES ADR520/ADR525/ADR530/ADR540/ADR550 Manual

1. 1 Changes to Figure Anria Re ee gs 8 Updated Outline 13 Changes to Applications Section see 11 Changes to Ordering Guide eee 14 12 07 Rev to Rev D 12 03 DataSheet Changed e Rev 0 to Rev A Changes to Figure 3 and Figure UM E 8 Updated Outline 13 Changes to Figure 15 Figure 16 and Figure 17 Captions 10 Change to Ordering Guide sse 14 Changes to Figure 2 3 beide E EE REUS 12 11 03 Revision 0 Initial Version Updated Outline Dimensions seen 13 8 07 Rev B to Rev C Changes to Figure 21 1 Updated Outline Dimensions 19 Changes to Ordering 14 Rev E Page 2 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 SPECIFICATIONS ADR520 ELECTRICAL CHARACTERISTICS In 50 pA to 15 mA Ta 25 C unless otherwise noted Table 2 Parameter Symbol Conditions Min Typ Max Unit Output Voltage Grade 2 040 2 048 2 056 V Grade B 2 044 2 048 2 052 V Initial Accuracy 0 4 8 8 mV Grade B 0 2 4 4 mV Temperature Coefficient TCVo 40 C lt Ta lt 85 C Grade 25 70 Grade 15 40 ppm C Output Voltage Change vs lin AVR 0 1 mA to 15 mA 1 mV 40 C lt
2. Table 4 Parameter Symbol Conditions Min Typ Max Unit Output Voltage 2 988 3 000 3 012 V Grade B 2 994 3 000 3 006 V Initial Accuracy VornR Grade A 30 406 12 12 mV Grade B 0 2 6 6 mV Temperature Coefficient TCVo 40 C lt lt 85 C Grade A 25 70 Grade 15 40 ppm C Output Voltage Change vs lin AVR 0 1 mA to 15 mA 1 mV 40 C lt lt 85 C 4 mV IN 1 mA to 15 mA 40 C lt lt 85 C 2 mV Dynamic Output Impedance lin 0 1 mA to 15 mA 0 2 Q Minimum Operating Current lin 40 C lt Ta lt 85 C 50 Voltage Noise EN p p 0 1 Hz to 10 Hz 22 Turn On Settling Time 2 us Output Voltage Hysteresis AVour 1 mA 40 ppm Guaranteed by design not production tested m 1 J ADR540 ELECTRICAL CHARACTERISTICS Im 50 uA to 15 mA 25 C unless otherwise noted Table 5 Parameter Symbol Conditions Min Typ Max Unit Output Voltage Grade 4 080 4 096 4 112 V Grade B 4 088 4 096 4 104 V Initial Accuracy VornR Grade A 30 406 16 16 mV Grade B 0 2 8 8 mV Temperature Coefficient TCVo 40 C lt Ta lt 85 C Grade A 25 70 Grade 15 40 Output Voltage Change vs lin AVR 0 1 mA to 15 mA 1 mV 40 C lt lt 85 C 5 mV IN 1 mA to 15 mA 40 C lt lt 85 C 2 mV Dynamic Output Impedance 0 1 mA to 15 mA 0 2
3. ANALOG DEVICES High Precision Shunt Mode Voltage References ADR9520 ADR525 ADR530 ADR540 ADR550 FEATURES Ultracompact SC70 and SOT 23 3 packages Temperature coefficient 40 ppm C maximum 2x the temperature coefficient improvement over the LM4040 Pin compatible with the LM4040 LM4050 Initial accuracy 0 2 Low output voltage noise 14 uV 2 5 V output No external capacitor required Operating current range 50 pA to 15 mA Industrial temperature range 40 C to 85 C APPLICATIONS Portable battery powered equipment Automotive Power supplies Data acquisition systems Instrumentation and process control Energy measurement Table 1 Selection Guide Temperature initial Coefficient Part Voltage V Accuracy ppm C ADR520A 2 048 0 4 70 ADR520B 2 048 0 2 40 ADR525A 2 5 0 4 70 ADR525B 2 5 20 2 40 ADR530A 3 0 0 4 70 ADR530B 3 0 0 2 40 ADR540A 4 096 0 4 70 ADR540B 4 096 0 2 40 ADR550A 5 0 0 4 70 ADR550B 5 0 0 2 40 Rev E 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 p
4. 15 10 35 60 85 5 TEMPERATURE C Figure 14 ADR550 Load Transient Response Figure 16 Data for Five Parts of ADR530 Vour over Temperature 2 5030 5 008 2 5025 5 006 2 5020 5 004 2 5015 5 002 2 5010 5 000 5 2 5005 5 4 998 o o 2 5000 4 996 2 4995 4 994 1 2 4990 4 992 2 4985 i I 4 4990 i 2 4980 4 988 40 15 10 35 60 85 5 40 15 10 35 60 85 TEMPERATURE C g TEMPERATURE C g Figure 15 Data for Five Parts of ADR525 Vour over Temperature Figure 17 Data for Five Parts of ADR550 Vour over Temperature Rev E Page 10 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 THEORY OF OPERATION 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 Vse 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 low temperature coefficient references Extra polation of the temperature characteristics of any one of these devices to absolute zero with the collector current proportional to the absolute temperature however reveals that its Vse approaches approximately the silicon band gap voltage Thus if a voltage develops with an opposing temperature coefficient to sum the Vm a z
5. 250 40 C to 85 C ADR530BKS REEL7 3 0 6 40 3 Lead 5 70 KS 3 RSB 3 000 40 C to 85 C ADR530BKSZ REEL 7 3 0 6 40 3 Lead SC70 KS 3 R1Y 3 000 40 C to 85 C ADR530BRT R2 3 0 6 40 3 Lead SOT 23 3 RT 3 RSB 250 40 C to 85 C ADR530BRT REEL7 3 0 6 40 3 Lead SOT 23 3 RT 3 RSB 3 000 40 C to 85 C ADR530BRTZ REEL7 3 0 6 40 3 Lead SOT 23 3 RT 3 R1Y 3 000 40 C to 85 C ADR540ART R2 4 096 16 70 3 Lead SOT 23 3 RT 3 RTA 250 40 C to 85 C ADR54OART REEL7 4 096 16 70 3 Lead SOT 23 3 RT 3 RTA 3 000 40 C to 85 C ADR540ARTZ REEL7 4 096 16 70 3 Lead SOT 23 3 RT 3 R1U 3 000 40 C to 85 C ADR540BKS R2 4 096 8 40 3 Lead SC70 KS 3 RTB 250 40 C to 85 C ADR540BKS REEL7 4 096 8 40 3 Lead SC70 KS 3 RTB 3 000 40 C to 85 C ADR540BKSZ REEL7 4 096 8 40 3 Lead SC70 KS 3 R1V 3 000 40 C to 85 C ADR540BRT R2 4 096 8 40 3 Lead SOT 23 3 RT 3 RTB 250 40 C to 85 ADR540BRT REEL7 4 096 8 40 3 Lead SOT 23 3 RT 3 RTB 3 000 40 C to 85 C ADR540BRTZ REEL7 4 096 8 40 3 Lead SOT 23 3 RT 3 R1V 3 000 40 C to 85 C ADR550ART R2 5 0 20 70 3 Lead SOT 23 3 RT 3 RVA 250 40 C to 85 C ADR550ART REEL7 5 0 20 70 3 Lead SOT 23 3 RT 3 RVA 3 000 40 C to 85 C ADR550ARTZ REEL7 5 0 20 70 3 Lead SOT 23 3 RT 3 R1Q 3 000 40 C to 85 C ADR550BKS R2 5 0 10 40 3 Lead SC70 KS 3 RVB 250 40 C to 85 C ADR550BKS REEL7 5 0 10 40 3 Lead SC70 KS 3 RVB 3 000 40 C to 85 C ADR550BKSZ REEL7 5 0 10 40 3 Lead SC70 KS 3 R1P 3 0
6. C to 85 C ADR520BKS R2 2 048 4 40 3 Lead SC70 KS 3 ROB 250 40 C to 85 C ADR520BKS REEL7 2 048 4 40 3 Lead SC70 KS 3 ROB 3 000 40 C to 85 C ADR520BKSZ REEL 7 2 048 4 40 3 Lead SC70 KS 3 RIT 3 000 40 C to 85 C ADR520BRT R2 2 048 4 40 3 Lead SOT 23 3 RT 3 ROB 250 40 C to 85 C ADR520BRT REEL7 2 048 4 40 3 Lead SOT 23 3 RT 3 ROB 3 000 40 C to 85 C ADR520BRTZ REEL7 2 048 4 40 3 Lead SOT 23 3 RT 3 RIT 3 000 40 C to 85 C ADR525ART R2 2 5 10 70 3 Lead SOT 23 3 RT 3 RRA 250 40 C to 85 C ADR525ART REEL7 2 5 10 70 3 Lead SOT 23 3 RT 3 RRA 3 000 40 C to 85 C 525 2 2 5 10 70 3 Lead SOT 23 3 RT 3 250 40 C 85 ADR525ARTZ REEL 7 2 5 10 70 3 Lead SOT 23 3 RT 3 3 000 40 C 85 ADR525BKS R2 2 5 5 40 3 Lead SC70 KS 3 RRB 250 40 C to 85 C ADR525BKS REEL7 2 5 5 40 3 Lead SC70 KS 3 RRB 3 000 40 C to 85 C ADR525BKSZ REEL 7 2 5 5 40 3 Lead SC70 KS 3 RIN 3 000 40 C to 85 C ADR525BRT R2 2 5 5 40 3 Lead SOT 23 3 RT 3 RRB 250 40 C to 85 C ADR525BRT REEL7 2 5 5 40 3 Lead SOT 23 3 RT 3 RRB 3 000 40 C to 85 C ADR525BRTZ REEL7 2 5 5 40 3 Lead SOT 23 3 RT 3 RIN 3 000 40 C to 85 C ADR530ART R2 3 0 12 70 3 Lead SOT 23 3 RT 3 RSA 250 40 C to 85 C ADR530ART REEL7 3 0 12 70 3 Lead SOT 23 3 RT 3 RSA 3 000 40 C to 85 C ADR530ARTZ REEL 7 3 0 12 70 B Lead SOT 23 3 RI 3 RIX 3 000 40 C to 85 ADR530BKS R2 3 0 6f 40 3 Lead 5C70 5 3 RSB
7. lt 85 C 4 mV 1 mAto 15 mA 40 C lt lt 85 C 2 mV Dynamic Output Impedance AVn Aln ly 0 1 mA to 15 mA 0 27 Q Minimum Operating Current lin 40 C lt Ta lt 85 C 50 uA Voltage Noise EN p p 0 1 Hz to 10 Hz 14 uV p p Turn On Settling Time tR 2 Hs Output Voltage Hysteresis AVour Hys I 1 40 Guaranteed by design not proditione taa i j ADR525 ELECTRICAL CHARACTERISTICS Im 50 uA to 15 mA 25 C unless otherwise noted Table 3 Parameter Symbol Conditions Min Typ Max Unit Output Voltage Grade 2 490 2 500 2 510 V Grade B 2 495 2 500 2 505 V Initial Accuracy VornR Grade A 0 4 10 10 mV Grade B 30 296 5 5 mV Temperature Coefficient TCVo 40 C lt Ta lt 85 C Grade A 25 70 Grade 15 40 ppm C Output Voltage Change vs lin AVR 0 1 mA to 15 mA 1 mV 40 C lt lt 85 C 4 mV IN 1 mA to 15 mA 40 C lt lt 85 C 2 mV Dynamic Output Impedance lin 0 1 mA to 15 mA 0 2 Q Minimum Operating Current lin 40 C lt Ta lt 85 C 50 yA Voltage Noise EN p p 0 1 Hz to 10 Hz 18 Turn On Settling Time tr 2 us Output Voltage Hysteresis AVovr IN 1 mA 40 ppm Guaranteed by design not production tested Rev E Page 3 16 ADR520 ADR525 ADR530 ADR540 ADR550 ADR530 ELECTRICAL CHARACTERISTICS In 50 pA to 15 mA Ta 25 C unless otherwise noted
8. Q Minimum Operating Current lin 40 C lt Ta lt 85 50 yA Voltage Noise EN p p 0 1 Hz to 10 Hz 30 Turn On Settling Time 2 us Output Voltage Hysteresis AVovr Hys 1 mA 40 ppm Guaranteed by design not production tested Rev E Page 4 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 ADR550 ELECTRICAL CHARACTERISTICS In 50 pA to 15 mA Ta 25 C unless otherwise noted Table 6 Parameter Symbol Conditions Min Typ Max Unit Output Voltage Grade 4 980 5 000 5 020 Grade 4 990 5 000 5 010 V Initial Accuracy VornR Grade A 30 496 20 20 mV Grade B 30 296 10 10 mV Temperature Coefficient TCVo 40 C lt Ta lt 85 C Grade A 25 70 ppm C Grade B 15 40 Output Voltage Change vs lin AVR 0 1 mA to 15 mA 1 mV 40 C lt lt 85 C 5 mV IN 1 mA to 15 mA 40 C lt lt 85 C 2 mV Dynamic Output Impedance lin 0 1 mA to 15 mA 0 2 Q Minimum Operating Current lin 40 C lt Ta lt 85 C 50 yA Voltage Noise EN p p 0 1 Hz to 10 Hz 38 Turn On Settling Time 2 us Output Voltage Hysteresis AVour Hys IN 1 mA 40 ppm Guaranteed by design not production tested Rev E Page 5 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 ABSOLUTE MAXIMUM RATINGS Ratings apply at 25 C unless otherwise noted THERMAL RESISTANCE Table 7 Table 8 Par
9. 00 40 C to 85 C ADR550BRT R2 5 0 10 40 3 Lead SOT 23 3 RT 3 RVB 250 40 C to 85 C ADR550BRT REEL7 5 0 10 40 3 Lead SOT 23 3 RT 3 RVB 3 000 40 C to 85 C ADR550BRTZ REEL7 5 0 10 40 3 Lead SOT 23 3 RT 3 R1P 3 000 40 C to 85 C 17 RoHS Compliant Part Rev E Page 14 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 NOTES Rev E Page 15 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 NOTES 2003 2008 Analog Devices Inc All rights reserved Trademarks and ANALOG registered trademarks are the property of their respective owners D04501 0 6 08 E DEVICES www analo g com Rev E Page 16 of 16
10. 19 Shunt Reference Given these conditions determined by the supply voltage Vs the load and operating currents I and lw of the ADR520 ADR525 ADR530 ADR540 ADR550 and the output voltage of the ADR520 ADR525 ADR530 ADR540 ADR550 3 BIAS Precision Negative Voltage Reference The ADR520 ADR525 ADR530 ADR540 ADR550 are suit able for applications where a precise negative voltage is desired Figure 20 shows the ADR525 configured to provide a negative output ADR525 a 2 5V 04501 004 Vs Figure 20 Negative Precision Reference Configuration Output Voltage Trim The trim terminal of the ADR520 ADR525 ADR530 ADR540 ADRS550 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 using the AD5273 an Analog Devices Inc 10 potentiometer Vs R O AD5273 ADR530 POTENTIOMETER 10kQ 04501 005 Figure 21 Output Voltage Trim Rev E Page 11 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 Stacking the ADR520 ADR525 ADR530 ADR540 ADR550 for User Definable Outputs Multiple ADR520 ADR525 ADR530 ADR540 ADR550 parts can be stacked to allow the user to obtain a desired higher voltage Figure 22
11. R2 VREF Vout Vrer 1182 81 ADR5xx C1 OPTIONAL o z 04501 023 Figure 24 Adjustable Voltage Source NAL Rev Page 12 16 ADR520 ADR525 ADR530 ADR540 ADR550 OUTLINE DIMENSIONS 2 20 2 00 1 80 1 35 1 25 115 3 2 40 2 10 et 2 1 80 0 65 BSC 0 40 1 00 1 10 80 H 0 80 040 y 0 30 0 10 MAX 040 026 f 0 25 SEATING 0 10 0 10 0 10 COPLANARITY diu 111505 0 ALL DIMENSIONS COMPLIANT WITH EIAJ SC70 Figure 25 3 Lead Thin Shrink Small Outline Transistor Package SC70 KS 3 Dimensions shown in millimeters 1 12 0 89 0 100 0 180 0 003 1 0 085 SEATING P 051 0 55 0 37 gt 092707 A COMPLIANT TO JEDEC STANDARDS TO 236 AB Figure 26 3 Lead Small Outline Transistor Package SOT 23 3 RT 3 Dimensions shown in millimeters Rev E Page 13 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 ORDERING GUIDE Initial Tempco Number Output Accuracy Industrial Package Package of Parts Temperature Model Voltage mV ppm C Description Option Branding per Reel Range ADR520ART R2 2 048 8 70 3 Lead SOT 23 3 RT 3 RQA 250 40 C to 85 C ADR520ART REEL7 2 048 8 70 3 Lead SOT 23 3 RT 3 RQA 3 000 40 C to 85 C ADR520ARTZ REEL7 2 048 8 70 3 Lead SOT 23 3 RT 3 15 3 000 40
12. VERSE VOLTAGE CHANGE mV A 3 2 1 4us DIV z TIME us g 8 Figure 3 ADR520 Reverse Voltage vs Operating Current Figure 6 ADR525 Turn On Response REVERSE VOLTAGE CHANGE mV 04501 011 04501 008 mA Figure 4 ADR525 Reverse Voltage vs Operating Current Figure 7 ADR525 Turn On Response Rev E Page 8 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 Vout 1V DIV Vout 2V DIV 4us DIV t 20us DIV 00 04501 012 04501 015 TIME us TIME us Figure 8 ADR520 Turn On Response Figure 11 ADR550 Turn On Response T T PEAK TO PEAK 13 5uV RMS 2 14 Vour 1V DIV 10 6 yr AIL JR 1 114 TIME us TIME us Figure 9 ADR520 Turn On Response Figure 12 ADR520 Voltage Noise 0 1 Hz to 10 Hz 045017013 04501 021 2VIDIV 50mV 4us DIV 10ys DIV 04501 014 TIME us 04501 016 TIME us Figure 10 ADR550 Turn On Response Figure 13 ADR525 Load Transient Response Rev E Page 9 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 10ys DIV 04501 017 TIME us 40
13. ameter Rating Package Type Unit Reverse Current 25 3 Lead SC70 KS 580 5 1774 C W Forward Current 3 Lead SOT 23 3 RT 270 102 C W Storage Temperature Range 65 to 150 C is specified for worst case conditions such as for devices soldered on Industrial Temperature Range 40 C to 85 C circuit boards for surface mount packages Junction Temperature Range 65 C to 150 C Lead Temperature Soldering 60 sec 300 C ESD CAUTION Stresses above those listed under Absolute Maximum Ratings ESD electrostatic discharge sensitive device may cause permanent damage to the device This is a stress Changed devices and Circuit boards Cam discharge without detection Although this product features rating only functional operation of the device at these or any patented or proprietary protection circuitry damage other conditions above those indicated in the operational dy aA may occur on devices subjected to high energy ESD Therefore proper ESD precautions should be taken to section of this specification is not implied Exposure to absolute avoid performance degradation or loss of functionality maximum rating conditions for extended periods may affect device reliability WY D ALI Rev E Page 6 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 PARAMETER DEFINITIONS TEMPERATURE COEFFICIENT Temperature coefficient is defined as the change in outp
14. ero temperature coefficient reference results The ADR520 ADR525 ADR530 ADR540 ADR550 circuit shown in Figure 18 provides such a compensating voltage V1 by driving two transistors at different current densities and amplifying the resultant Vs difference AVsz which has positive temperature coefficient The sum of and V1 provides a stable voltage reference over temperature 04501 002 Figure 18 Circuit Schematic APPLICATIONS The ADR520 ADR525 ADR530 ADR540 ADR550 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 remain stable All shunt voltage references require an external bias resistor Rams between the supply voltage and the reference see Figure 19 Rais sets the current that flows through the load 11 and the reference Im Because the load and the supply voltage can vary Reis needs to be chosen based on the following considerations Rais must be small enough to supply the minimum Im current to the ADR520 ADR525 ADR530 ADR540 ADR550 even when the supply voltage is at its minimum value and the load current is at its maximum value Rais must be large enough so that I does not exceed 15 mA when the supply voltage is at its maximum value and the load current is at its minimum value Vout IL ADR550 04501 003 Figure
15. reserved ADR520 ADR525 ADR530 ADR540 ADR550 TABLE OF CONTENTS Features a acid Si acc Se en ciel 1 Absolute Maximum Ratings eterne 6 Applications Aera re 1 Thermal Resistance 6 Pin Configuration 1 ESD Catton 6 General Description zio aene 1 Parameter 7 2 Temperature Coefficient sse 7 RD E ER Ue E en 3 Thermal 7 ADR520 Electrical 3 Typical Performance Characteristics sse 8 ADR525 Electrical 3 Theory of Operations tinin u a 11 ADR530 Electrical Characteristics ses 4 Applications rette We 11 ADR540 Electrical 4 Outline 13 ADR550 Electrical Characteristics sse 5 Ordering Guides ere 14 REVISION HISTORY 6 08 Rev D to Rev E 1 06 Rev A to Rev B Changes to Table 3 3 Updated Formatting eere Universal Changes to Table 4 and 5 4 Changes to Features Section 2 Changes to Table 5 Changes to General Description Section
16. roperty of their respective owners PIN CONFIGURATION ADR520 ADR525 ADR530 V 3 TRIM ADR540 ADR550 04501 001 V 2 Figure 1 3 Lead SC70 KS and 3 Lead SOT 23 3 RT GENERAL DESCRIPTION Designed for space critical applications the ADR520 ADR525 ADR530 ADR540 ADR550 are high precision shunt voltage references housed in ultrasmall 5 70 and SOT 23 3 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 uV p p Available in output voltages of 2 048 V 2 5 V 3 0 V 4 096 V and 5 0 V the advanced design of the ADR520 ADR525 ADR530 ADR540 ADR550 eliminates the need for compensa tion by an external capacitor yet the references are stable with any capacitive load The minimum operating current increases from a mere 50 tof of 15 mA This low operating current and ease of use F references ideally suited for handheld battery powered applications A trim terminal is available on the ADR520 ADR525 ADR530 ADR540 ADR550 to allow adjustment of the output voltage over a 10 596 range without affecting the temperature coefficient of the device This feature provides users with the flexibility to trim out any system errors 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 2003 2008 Analog Devices Inc All rights
17. shows three ADR550s configured to give 15 V The bias resistor is chosen using Equation 3 note that the same bias current flows through all the shunt references in series Figure 23 shows three ADR550s stacked to give 15 V Rais is calculated in the same manner as before Parts of different voltages can also be added together For example an ADR525 and ADR550 can be added together to give an output of 17 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 temperature coefficients and output voltage change vs input current Vpp R 15V ADR550 ADR550 ADR550 04501 022 GND Figure 22 15 V Output with Stacked ADR550s MI GND ADR550 T ADR550 15 R 04501 024 Vpp Figure 23 15 V Output with Stacked ADR550s Adjustable Precision Voltage Source The ADR520 ADR525 ADR530 ADR540 ADR550 combined with a precision low input bias op amp such as the AD8610 can be used to output a precise adjustable voltage Figure 24 illustrates the implementation of this application using the ADR520 ADR525 ADR530 ADR540 ADR550 The output of the op amp Vour is determined by the gain of the circuit which is completely dependent on the resistors R1 and R2 Vour Vrer 1 R2 R1 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
18. ut voltage with respect to operating temperature changes and is normalized by the output voltage at 25 C This parameter is expressed in ppm C and is determined by the following equation is Vour Vour ep oC Vour 25 C x T T 106 1 where Vour T2 Vour at Temperature 2 Vovr at Temperature 1 Vour 25 C Vour at 25 C 1 1 THERMAL HYSTERESIS 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 Vour_uys Vou 25 C Vour_enp ES Vour 25 C Vour_END OUT _ HYS Vopr 25 C x 10 where Vour 25 C Vour at 25 C Vour_enp Vovr at 25 C after a temperature cycle from 25 C to 40 C then 85 C and back to 25 C Rev E Page 7 of 16 ADR520 ADR525 ADR530 ADR540 ADR550 TYPICAL PERFORMANCE CHARACTERISTICS ADRS550 ADR540 lt Sst 4 gt T AM ADR520 85 25 C 856 REVERSE VOLTAGE CHANGE mV 04501 009 MINIMUM OPERATING CURRENT pA 5 lin mA Figure 2 Reverse Characteristics and Minimum Operating Current Figure 5 ADR550 Reverse Voltage vs Operating Current 8 EI RE

ANALOG DEVICES ADR520/ADR525/ADR530/ADR540/ADR550 Manual

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