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LT1991IDD-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT1991IDD-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT1991 1 1991fg – + 5V ΔVIN VM(IN) VP(IN) – + VOUT = VREF +ΔVIN SWING 40mV TO EITHER RAIL ROUT <0.1Ω VREF = 2.5V INPUT RANGE –0.5V TO 5.1V RIN = 900kΩ LT1991 1991 TA01 50k 50k 150k 150k 450k 450k 4pF 450k 450k 4pF FEATURES APPLICATIONS DESCRIPTION Precision, 100µA Gain Selectable Amplifier The LT®1991 combines a precision operational amplifier with eight precision resistors to form a one-chip solution for accurately amplifying voltages. Gains from –13 to 14 with a gain accuracy of 0.04% can be achieved using no external components. The device is particularly well suited for use as a difference amplifier, where the excellent resis- tor matching results in a common mode rejection ratio of greater than 75dB. The amplifier features a 50μV maximum input offset volt- age and a gain bandwidth product of 560kHz. The device operates from any supply voltage from 2.7V to 36V and draws only 100μA supply current on a 5V supply. The output swings to within 40mV of either supply rail. The resistors have excellent matching, 0.04% over tem- perature for the 450k resistors. The matching temperature coefficent is guaranteed less than 3ppm/°C. The resistors are extremely linear with voltage, resulting in a gain non- linearity of less than 10ppm. The LT1991 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 10-lead MSOP and low profile (0.8mm) 3mm × 3mm DFN packages. Rail-to-Rail Gain = 1 Difference Amplifier n Pin Configurable as a Difference Amplifier, Inverting and Noninverting Amplifier n Difference Amplifier Gain Range 1 to 13 CMRR >75dB n Noninverting Amplifier Gain Range 0.07 to 14 n Inverting Amplifier Gain Range –0.08 to –13 n Gain Error <0.04% n Gain Drift < 3ppm/°C n Wide Supply Range: Single 2.7V to Split ±18V n Micropower: 100μA Supply Current n Precision: 50μV Maximum Input Offset Voltage n 560kHz Gain Bandwidth Product n Rail-to-Rail Output n Space Saving 10-Lead MSOP and DFN Packages n Handheld Instrumentation n Medical Instrumentation n Strain Gauge Amplifiers n Differential to Single-Ended Conversion RESISTOR MATCHING (%) 0.04 1991 TA01b –0.02 0 0.02 40 35 30 25 20 15 10 5 0 –0.04 450k RESISTORS LT1991A Distribution of Resistor Matching L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION |
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