Datasheet LT1991 (Analog Devices)

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