Datasheet LT1997-1 (Analog Devices)

LT1997-1 Precision, High Voltage, Gain Selectable Difference/Current Sense Amplifier
FEATURES DESCRIPTION
n Precision Gain: Up to 80V/V The LT®1997-1 is a difference amplifier that can be used to n Input Common Mode Voltage Range: V– to V– + 76V amplify small differential signals while rejecting large com- n 109dB Minimum CMRR (Gain = 10) mon mode signals making it an ideal choice for current sense n 0.012% (120ppm) Maximum Gain Error (Gain = 10) applications. It combines a precision operational amplifier n 1ppm/°C Maximum Gain Error Drift with highly-matched resistors to form a one-chip solution to n 2ppm Maximum Gain Nonlinearity amplify and level shift voltages accurately using no external n Wide Supply Voltage Range: 3.3V to 50V components. It comes with three standard pin-selectable n Rail-to-Rail Output gain options (10, 20 and 50), which can be further combined n 350µA Supply Current to form gains from 0.141 to 80 with accuracy of 0.012% n 65µV Maximum Op Amp Offset Voltage (120ppm). The LT1997-1 also operates with input voltages n 650kHz –3dB Bandwidth (Gain = 10) between V– and V– + 76V (independent of V+), enabling n Low Power Shutdown: 20µA robust operation in demanding industrial environments. n Space-Saving MSOP and DFN Packages Its excellent resistor matching results in a common mode rejection ratio of greater than 109dB (Gain = 10).
APPLICATIONS
The resistors maintain their excellent matching over tem- perature; the matching temperature coefficient is guaranteed n High Side or Low Side Current Sensing less than 1ppm/°C. The resistors are extremely linear with n Bidirectional Wide Common Mode Range Current voltage, resulting in a gain nonlinearity of less than 2ppm. Sensing n High Voltage to Low Voltage Level Translation The LT1997-1 is fully specified at 5V and ±15V supplies n Industrial Data-Acquisition Front-Ends and from –40°C to 125°C. The device is available in space n Replacement for Isolation Circuits saving 16-lead MSOP and 4mm × 4mm DFN14 packages. n Differential to Single-Ended Conversion All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Precision Wide Voltage Range, Bidirectional Current Monitor Typical Distribution of CMRR (G = 10)
15V VSOURCE = –15V TO 61V 250 –INA –INB –INC V+ LT1997-1 661 UNITS VS = ±15V FROM 2 RUNS VCM = –15V TO 3k MS16(12) +14.575V 200 7.5k 150k 15k – 150 R R OUT SENSE C V 1Ω 1Ω 15k OUT = ±10mV/mA + 100 NUMBER OF UNITS 7.5k 300k REF2 50 3k 300k REF1 LOAD 0 +INA +INB +INC SHDN V– –5 –4 –3 –2 –1 0 1 2 3 4 5 CMRR (µV/V = ppm) 19971 TA01a –15V 19971 TA01b Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Block Diagram Applications Information Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Typical Application Related Parts