Precision Voltage References LT®6654 n n n n n n LTC®6655 0.05%, 10ppm/°C Max Wide Supply Range to 36V Low Noise: 1.6ppmP-P (0.1Hz to 10Hz) Sinks and Sources ±10mA Fully Specified from –55°C to 125°C SOT-23 Package Ultralow Noise: 0.25ppmP-P (0.1Hz to 10Hz) 0.025%, 2ppm/°C Max 100% Tested at –40°, 25°C, and 125°C VS Up to 13.2V Low Power Shutdown: <20µA 8-Lead MSOP Package n LT6656 Ultralow Supply Current: 0.85µA 0.05%, 10ppm/°C Max 10mV Dropout Voltage Fully Specified from –40°C to 85°C VS Up to 18V Low Power Shutdown: <20µA Reverse Input/Output Protection SOT-23 Package n n n n n n n n n n n n n 1.25V • 2.048V • 2.5V • 3V • 3.3V • 4.096V • 5V A voltage reference functions as an independent standard in measurement and detection circuits, and often determines the accuracy of the entire electronic system. For help in understanding which factors will impact your design, read “How To Choose a Voltage Reference” at linear.com/vrefselect. This article discusses the most critical reference specifications and how they impact overall accuracy. It also covers the differences between bandgap and Zener architectures as well as series vs shunt references. Voltage reference noise frequently defines the measurement limits in instrumentation systems. Noise ultimately translates into quantization uncertainty in A to D converters, introducing jitter in applications such as scales, inertial navigation systems, infrared thermography, DVMs and medical imaging apparatus. Application Note 124 offers a detailed discussion on how to measure noise in precision voltage references. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. www.linear.com/vrefselect www.linear.com/an124 Series Shunt Temperature 0.1Hz - 10Hz Drift (Max) Noise ppm/°C ppm Output Current mA IQ/ISHUNT mA Dropout Headroom V Package ±10 7 0.5 MS-8 H 8 50 0.05 0.3 SO-8 C, I 0.6 –10 to +15 3.1 3 DIP-8 C 0.6 –10 to +15 3.1 3 DIP-8 SO-8 C 5 2.5 ±10 1 1.1 DIP-8 SO-8 C, I 0.05% 5 0.6 ±10 1.7 1 TO-39 C, M LT1236A 0.05% 5 0.6 ±10 1.2 2.2 DIP-8 SO-8 C, I LTC6652A 0.05% 5 2.8 ±5 0.56 0.3 MS-8 H LTC6655C 0.05% 5 0.25 ±10 7 0.5 MS-8 H LT1027D 0.05% 5 0.6 –10 to +15 2.7 3 DIP-8 SO-8 C LT6654A 0.05% 10 0.8 to 2.2 ±10 0.6 0.1 SOT-23 H, M LT6656A 0.05% 10 24 –0.1 to 10 0.001 0.01 SOT-23, DFN C, I LT1790A 0.05% 10 16 –3 to 5 0.06 0.1 SOT-23 C, I LT1021C 0.05% 20 0.6 ±10 1.2 2.2 TO-5 DIP-8 C, I, M LT1461B 0.06% 7 8 50 0.05 0.3 SO-8 C, I LT1460A 0.075% 10 4 –1 to 20 0.175 0.9 DIP-8 SO-8 C LT1461C 0.08% 12 8 50 0.05 0.3 SO-8 C, I LT1027E 0.10% 7.5 0.6 –10 to +15 2.7 3 DIP-8 SO-8 C LT1236B 0.10% 10 0.6 ±10 1.2 2.2 DIP-8 SO-8 C, I LTC6652B 0.10% 10 2.1 ±5 0.56 0.3 MS-8 H LT1460B 0.10% 10 4 –1 to 20 0.175 0.9 DIP-8 SO-8 I LT1031C 0.10% 15 0.6 ±10 1.7 1 TO-39 C LT1236C 0.10% 15 0.6 ±10 1.2 2.2 DIP-8 SO-8 C, I LT1460C 0.10% 15 4 –1 to 20 0.175 0.9 MS-8 C LT6654B 0.1% 20 0.8 to 2.2 ±10 0.6 0.1 SOT-23 H, M LT6656B 0.10% 20 24 –0.1 to 10 0.001 0.01 SOT-23, DFN C, I LT1460D 0.10% 20 4 –1 to 20 0.175 0.9 DIP-8 SO-8 C LT1790B 0.10% 25 16 –3 to 5 0.06 0.1 SOT-23 C, I LT1460E 0.125% 20 4 –1 to 20 0.175 0.9 DIP-8 SO-8 I LT1461D 0.15% 20 8 10 0.05 0.3 SO-8 H LT1460F 0.15% 25 4 –1 to 20 0.175 0.9 MS-8 C LTC1798 0.15% 40 8 –2 to 10 0.0065 0.1 SO-8 C LTC1258 0.15% 40 8 –2 to 10 0.0065 0.1 MS-8 C LT1019 0.20% 20 2.5 ±10 1.2 1.1 DIP-8 SO-8 C, I LT1460H 0.20% 20 4 –1 to 20 0.175 0.9 SOT-23 C LT1460L 0.20% 20 4 –1 to 20 0.175 0.9 SO-8 I, H LT6660H 0.20% 20 4 –1 to 20 0.2 0.9 2 x 2mm DFN C LT1031D 0.20% 25 0.6 ±10 1.7 1 TO-39 C, M LT1460M 0.20% 50 4 –1 to 20 0.175 0.9 SO-8 H LT1460G 0.25% 25 4 –1 to 20 0.175 0.9 TO-92 C, I LT1460J 0.40% 20 4 –1 to 20 0.175 0.9 SOT-23 C LT6660J 0.40% 20 4 –1 to 20 0.2 0.9 2 x 2mm DFN C LT6650 0.5% 30 Typ 50 ±0.2 0.011 0.1 SOT-23 C, I, H LT1460K 0.5% 50 4 –1 to 20 0.175 0.9 SOT-23 C LT6660K 0.5% 50 4 –1 to 20 0.2 0.9 2 x 2mm DFN C LT1021B 1% 5 0.6 ±10 1.2 2.2 TO-5 DIP-8 C, M LT1021D 1% 20 0.6 ±10 1.2 2.2 SO-8 DIP-8 C, I LT580xH 0.4% 10 4 10 1 2 TO-52 LT581xH 0.3% 10 1 5 1 3 TO-39 LT582xH 0.3% 10 5 1 3 TO-39 LT1389A 0.05% 10 20 Shunt 0.006 to 2 N/A SO-8 C LT1634A 0.05% 10 7 Shunt 0.008 to 20 N/A SO-8 C, I LT1389B 0.05% 20 20 Shunt 0.006 to 2 N/A SO-8 C LT1634B 0.05% 25 7 Shunt 0.008 to 20 N/A SO-8 MS-8 C, I LT1389B 0.075% 50 20 Shunt 0.006 to 2 N/A SO-8 C LT1029A 0.2% 20 Shunt 0.6 to 10 N/A TO-92 C LT1009 0.2% 25 Shunt 0.4 to 10 N/A SO-8 MS-8 TO-92 C, I LT1634C 0.2% 25 Shunt 0.007 to 30 N/A TO-92 C LT1004 0.3% 20 typ Shunt 0.01 to 20 N/A SO-8 TO-92 C, I LTC1431 0.4% 30 Typ 1% 34 LT1034B 1.2% 20 LT1034 1.2% LTZ1000 4% LM399A 5% LM399 5% Reference Family Initial Accuracy LTC6655B 0.025% 2 LT1461A 0.04% 3 LT1027B 0.05% 2 LT1027C 0.05% 3 LT1019A 0.05% LT1031B LT1029 0.25 7 10 Temperature Grades 1.25V • 2.048V 2.5V 3V 3.3V 4.096V • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1 to 100 N/A DIP-8 TO-92 C, I Shunt 0.6 to 10 N/A TO-92 C 2.4 Shunt 0.02 to 20 N/A TO-92 C, I 40 2.4 Shunt 0.02 to 20 N/A SO-8 TO-92 C, I 0.05 0.17 Shunt N/A N/A TO-5 M 1 1.4 Shunt N/A N/A TO-46 C 2 1.4 Shunt N/A N/A TO-46 C 5V • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 10V • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 7V • • • • • • • • • • • • • • • • • Adjustable • • • • • –55°C to 200°C Shunt • • • • • • • • • • • • • • 4.5V • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Adjustable • • • • • • • • *Some parameters vary between package, voltage and temperature versions. 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