ADR121 Analog Devices, Inc., ADR121 Datasheet
ADR121
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ADR121 Summary of contents
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... MUST BE LEFT FLOATING The ADR12x is a low dropout voltage reference, requiring only 300 mV for ADR121/ADR125 and 1.45 V for ADR127 above the nominal output voltage on the input to provide a stable output voltage. This low dropout performance coupled with the low 85 μA operating current makes the ADR12x ideal for battery-powered applications. Available in an extended industrial temperature range of − ...
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... ADR121/ADR125/ADR127 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configuration............................................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 ADR121 Electrical Characteristics............................................. 3 ADR125 Electrical Characteristics............................................. 4 ADR127 Electrical Characteristics............................................. 5 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution.................................................................................. 6 REVISION HISTORY 6/06—Revision 0: Initial Version Terminology .......................................................................................7 Typical Performance Characteristics ..............................................8 Theory of Operation ...................................................................... 16 Power Dissipation Considerations........................................... 16 Notes ...
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... SPECIFICATIONS ADR121 ELECTRICAL CHARACTERISTICS @ T = 25° 2 mA, unless otherwise noted OUT Table 1. Parameter OUTPUT VOLTAGE B Grade A Grade INITIAL ACCURACY ERROR B Grade A Grade TEMPERATURE COEFFICIENT B Grade A Grade DROPOUT (V − OUT IN LOAD REGULATION LINE REGULATION PSRR RIPPLE REJECTION QUIESCENT CURRENT ...
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... ADR121/ADR125/ADR127 ADR125 ELECTRICAL CHARACTERISTICS @ T = 25° 5 mA, unless otherwise noted OUT Table 2. Parameter OUTPUT VOLTAGE B Grade A Grade INITIAL ACCURACY ERROR B Grade A Grade TEMPERATURE COEFFICIENT B Grade A Grade DROPOUT (V − OUT IN LOAD REGULATION LINE REGULATION PSRR RIPPLE REJECTION QUIESCENT CURRENT ...
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... 2 2 25° kHz 0 0.1 0.2 μF L 1000 hours @ 25°C See the Terminology section Rev Page ADR121/ADR125/ADR127 Min Typ Max Unit 1.2485 1.25 1.2515 V 1.2470 1.25 1.2530 V −0.12 +0.12 % −0.24 +0. ppm/° ppm/° ...
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... ADR121/ADR125/ADR127 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter V to GND IN Internal Power Dissipation TSOT (UJ-6) Storage Temperature Range Specified Temperature Range Lead Temperature, Soldering Vapor Phase (60 sec) Infrared (15 sec) 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 ...
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... The change of output voltage after the device is cycled through temperatures from +25°C to −40°C to +125°C and back to +25°C. This is a typical value from a sample of parts put through such a cycle. where: V (25° OTC +125°C and back to +25°C. Rev Page ADR121/ADR125/ADR127 ' ...
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... Figure 5. ADR127 Temperature Coefficient –50 –40 –30 –20 – TEMPERATURE COEFFICIENT (ppm/°C) Figure 6. ADR125 Temperature Coefficient –50 –40 –30 –20 – TEMPERATURE COEFFICIENT (ppm/°C) Figure 7. ADR121 Temperature Coefficient ...
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... LOAD CURRENT (mA) Figure 8. ADR127 Minimum Input Voltage vs. Load Current 3.5 3.4 3.3 3.2 +125°C 3.1 3.0 2.9 2.8 2.7 2.6 2.5 –2 – LOAD CURRENT (mA) Figure 9. ADR121 Minimum Input Voltage vs. Load Current 6.2 6.0 +125°C 5.8 5.6 5.4 5.2 5.0 –2 – LOAD CURRENT (mA) Figure 10. ADR125 Minimum Input Voltage vs. Load Current 120 100 +25°C 80 +125° ...
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... Figure 14. ADR127 Supply Current vs. Load Current 6 — +125°C — +25°C — –40° –2 – LOAD CURRENT (mA) Figure 15. ADR121 Supply Current vs. Load Current 6 — +125°C — +25°C — –40° –2 – LOAD CURRENT (mA) Figure 16 ...
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... Rev Page ADR121/ADR125/ADR127 = 0.1µF TIME (1s/DIV) Figure 23. ADR127 0 Noise = 0.1µF TIME (1s/DIV) Figure 24. ADR121 0 Noise = 0.1µF TIME (1s/DIV) Figure 25. ADR125 0 Noise CH1 p-p 5.76µV CH1 rms 0.862µV CH1 p-p 10.8µV CH1 rms 1.75µ ...
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... OUT 1 50µV/DIV TIME (1s/DIV) Figure 26. ADR127 KHz Noise 0.1µF IN OUT 1 100µV/DIV TIME (1s/DIV) Figure 27. ADR121 KHz Noise 0.1µF IN OUT 1 200µV/DIV TIME (1s/DIV) Figure 28. ADR125 KHz Noise V 1V/DIV IN ...
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... C = 0.1µF IN OUT 1 V OUT TIME (40µs/DIV) 1V/DIV 2 Figure 33. ADR121 Turn-On Response V IN 1V/DIV 1 V OUT 1V/DIV TIME (200µs/DIV) 2 Figure 34. ADR121 Turn-Off Response ADR121/ADR125/ADR127 0.1µF IN OUT V IN 2V/DIV 1 V OUT 2V/DIV 2 Figure 35. ADR125 Turn-On Response 0.1µF IN ...
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... OUT 100mV/DIV Figure 42. ADR127 Load Transient Response (Sourcing 1250Ÿ LOAD 2mA SINKING OUT 10mV/DIV Figure 43. ADR121 Load Transient Response (Sinking) Rev Page 2.50V = C = 0.1µF OUT 1.25V TIME (40µs/DIV) 1.25V 500mV/DIV = C = 0.1µF OUT 0V TIME (40µs/DIV) ...
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... V 1V/DIV 0.1µF IN OUT 500Ÿ LOAD 5mA SOURCING OUT 100mV/DIV TIME (40µs/DIV) Figure 44. ADR121 Load Transient Response (Sourcing) V 2V/DIV 0.1µF IN OUT 2.5kŸ LOAD 2mA SINKING OUT TIME (40µs/DIV) 20mV/DIV Figure 45. ADR125 Load Transient Response (Sinking) ...
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... ADR121/ADR125/ADR127 THEORY OF OPERATION The ADR12x band gap references are the high performance solution for low supply voltage and low power applications. The uniqueness of these products lies in their architecture. POWER DISSIPATION CONSIDERATIONS The ADR12x family is capable of delivering load currents with an input range from 3 When this device ...
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... With this configuration, circuit precision is maintained for load currents ranging from the reference’s supply current, typically 85 μA, to approximately 5 mA. and the OUT2 OUT1 ≥ 3. OUT1 Rev Page ADR121/ADR125/ADR127 V V OUT2 1.25 V 3.75 V 1.25 V 6.25 V 2 virtual OUT1 NC ...
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... ADR121/ADR125/ADR127 OUTLINE DIMENSIONS INDICATOR 0.10 MAX ORDERING GUIDE Output Initial Voltage Accuracy Model (V ) (mV/%) O ADR121AUJZ- 2.5 2.5 0.24 REEL7 1 ADR121AUJZ- 2.5 2.5 0. ADR121BUJZ- 2.5 2.5 0.12 REEL7 1 ADR125AUJZ- 5.0 5.0 0.24 1 REEL7 ADR125AUJZ- 5.0 5.0 0. ADR125BUJZ- 5.0 5.0 0.12 REEL7 1 ADR127AUJZ- 1.25 3 0.24 REEL7 1 ADR127AUJZ- 1. ADR127BUJZ- 1.25 1.5 0.12 REEL7 Pb-free part. 2.90 BSC 2.80 BSC 1.60 BSC PIN 1 0.95 BSC 1 ...
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... NOTES ADR121/ADR125/ADR127 Rev Page ...
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... ADR121/ADR125/ADR127 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05725-0-6/06(0) Rev Page ...