Datasheet LT1997-3 (Analog Devices)

LT1997-3 Precision, Wide Voltage Range Gain Selectable Amplifier
FEATURES DESCRIPTION
n Pin Configurable as a Difference Amplifier, Inverting The LT®1997-3 combines a precision operational amplifier Amplifier or Noninverting Amplifier with highly-matched resistors to form a one-chip solution n 91dB Minimum DC CMRR (Gain = 1) for accurately amplifying voltages. Gains from –13 to +14 n 65dB AC CMRR (at 100kHz, Gain = 1) with accuracy of 0.006% (60ppm) can be achieved using n 0.006% (60ppm) Maximum Gain Error (Gain = 1) no external components. The LT1997-3 is particularly well n 1ppm/°C Maximum Gain Error Drift suited for use as a difference amplifier, where the excellent n 2ppm Maximum Gain Nonlinearity resistor matching results in a common mode rejection n ±160V Common Mode Voltage Range ratio of greater than 91dB. n Wide Supply Voltage Range: 3.3V to 50V The amplifier features a 60μV maximum input offset voltage n Rail-to-Rail Output and a –3dB bandwidth of 1.1MHz (Gain = 1). The LT1997-3 n 350µA Supply Current operates from any supply voltage from 3.3V to 50V and n 60µV Maximum Op Amp Offset Voltage draws only 350μA supply current. The output typically n 1.1MHz –3dB Bandwidth (Gain = 1) swings to within 100mV of either supply rail. n Low-Power Shutdown: 20µA n Space-Saving MSOP and DFN Packages The resistors maintain their excellent matching over temperature; the matching temperature coefficient is
APPLICATIONS
guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less n High Side or Low Side Current Sensing than 2ppm. n Bidirectional Wide Common Mode Range Current Sensing The LT1997-3 is fully specified at 5V and ±15V supplies n High Voltage to Low Voltage Level Translation and from –40°C to 125°C. The device is available in space n Industrial Data-Acquisition Front-Ends saving 16-lead MSOP and 4mm × 4mm DFN14 packages. n Replacement for Isolation Circuits All registered trademarks and trademarks are the property of their respective owners. n Differential to Single-Ended Conversion
TYPICAL APPLICATION Gain = 1 Difference Amplifier Typical Distribution of CMRR (G = 1)
VSOURCE = –28V TO 26.5V 15V 1200 VS = ±15V VCM = –28V TO +26.5V –INA –INB –INC V+ LT1997-3 1000 4625 UNITS 2.5k FROM 3 RUNS 800 7.5k 22.5k 22.5k 600 – R R OUT SENSE C V 1Ω 1Ω 22.5k OUT = ±1mV/mA + 400 NUMBER OF UNITS 7.5k 45k REF2 200 2.5k 45k REF1 LOAD 0–30 –20 –10 0 10 20 30 CMRR (µV/V = ppm) +INA +INB +INC SHDN V– 19973 TA01b 19973 TA01a –15V Rev A Document Feedback For more information www.analog.com 1 Document Outline FEATURES DESCRIPTION APPLICATIONS 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