LT1997-1
Precision, High Voltage, Gain Selectable Difference/Current Sense Amplifier
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Overview
Features and Benefits
- Precision Gain: Up to 80V/V
- Input Common Mode Voltage Range: V– to V– + 76V
- 109dB Minimum CMRR (Gain = 10)
- 0.012% (120ppm) Maximum Gain Error (Gain = 10)
- 1ppm/°C Maximum Gain Error Drift
- 2ppm Maximum Gain Nonlinearity
- Wide Supply Voltage Range: 3.3V to 50V
- Rail-to-Rail Output
- 350µA Supply Current
- 65µV Maximum Op Amp Offset Voltage
- 650kHz –3dB Bandwidth (Gain = 10)
- Low Power Shutdown: 20µA
- Space-Saving MSOP and DFN Packages
Product Details
The LT1997-1 is a difference amplifier that can be used to amplify small differential signals while rejecting large common mode signals making it an ideal choice for current sense applications. It combines a precision operational amplifier with highly-matched resistors to form a one-chip solution to amplify and level shift voltages accurately using no external components. It comes with three standard pin-selectable gain options (10, 20 and 50), which can be further combined to form gains from 0.141 to 80 with accuracy of 0.012% (120ppm). The LT1997-1 also operates with input voltages between V– and V– + 76V (independent of V+), enabling robust operation in demanding industrial environments. Its excellent resistor matching results in a common mode rejection ratio of greater than 109dB (Gain = 10).
The resistors maintain their excellent matching over temperature; the matching temperature coefficient is guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 2ppm.
The LT1997-1 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 16-lead MSOP and 4mm × 4mm DFN14 packages.
Applications- High Side or Low Side Current Sensing
- Bidirectional Wide Common Mode Range Current Sensing
- High Voltage to Low Voltage Level Translation
- Industrial Data-Acquisition Front-Ends
- Replacement for Isolation Circuits
- Differential to Single-Ended Conversion
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Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LT1997-1
LT1997-2
LT1997-3
Design Tool
LT1997-1 Online Design Tool - BETA
Online Design Tool – BETA helps configure difference amplifier gain and topology with consideration for supply and output common mode limitations, analyzes noise and input impedance, and generates a downloadable LTSpice file for further simulation.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT1997HDF-1#PBF | Material Declaration | Reliability Data | 14(12)-Lead DFN (4mm x 4mm w/ EP) | |
| LT1997HDF-1#TRPBF | Material Declaration | Reliability Data | 14(12)-Lead DFN (4mm x 4mm w/ EP) | |
| LT1997HMS-1#PBF | Material Declaration | Reliability Data | 16(12)-Lead MSOP | |
| LT1997HMS-1#TRPBF | Material Declaration | Reliability Data | 16(12)-Lead MSOP | |
| LT1997IDF-1#PBF | Material Declaration | Reliability Data | 14(12)-Lead DFN (4mm x 4mm w/ EP) | |
| LT1997IDF-1#TRPBF | Material Declaration | Reliability Data | 14(12)-Lead DFN (4mm x 4mm w/ EP) | |
| LT1997IMS-1#PBF | Material Declaration | Reliability Data | 16(12)-Lead MSOP | |
| LT1997IMS-1#TRPBF | Material Declaration | Reliability Data | 16(12)-Lead MSOP | |
| Wafer Fabrication Data |
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.