AMC1400DWLR

Overview

The AMC1400DWLR is a precision, reinforced isolated amplifier featuring a ±250-mV input voltage range optimized for shunt resistor current sensing. It operates on 3.3-V or 5-V supplies and provides a fixed gain of 8.2 V/V with low DC errors including an offset error of ±0.2 mV and gain error of ±0.3%. The device utilizes a SiO2-based capacitive isolation barrier certified to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577 standards, supporting up to 7.5 kVRMS working voltage. It offers high common-mode transient immunity of 100 kV/µs and meets CISPR-11 and CISPR-32 EMI standards.

Feature Summary

• Reinforced galvanic isolation barrier certified to international safety standards
• Optimized for direct connection to low-impedance shunt resistors
• High common-mode transient immunity resistant to magnetic interference
• Low electromagnetic interference compliant with industrial emission standards

Applications

• Shunt-resistor-based current sensing in motor drives
• Current sensing in frequency inverters
• Current sensing in solar inverters
• Current sensing in wind turbine inverters
• Current sensing in rail transport systems

Procurement Notes

Verify the specific ordering suffix 'DWLR' corresponds to the stretched SOIC package variant when sourcing. Confirm that the application environment adheres to the specified extended industrial temperature range of –40°C to +125°C. Ensure PCB layout maintains the required creepage and clearance distances to preserve the certified isolation ratings. Validate power supply decoupling practices against the datasheet recommendations to maintain signal integrity.

Selection Notes

Select this component for applications requiring precise current measurement across high-voltage isolation barriers. The fixed gain and wide input range simplify design for shunt-based sensing. Consider the package dimensions and thermal resistance for heat dissipation requirements. Verify compatibility with system noise levels given the output bandwidth and noise density specifications.

Part Context

This part belongs to the AMC1400 series of precision isolated amplifiers from Texas Instruments. It is designed specifically for high-reliability current sensing applications where electrical isolation is critical. The device integrates a delta-sigma modulator and analog filter to provide accurate signal transmission across the isolation barrier.

Replacement Considerations

Direct replacements within the same family include the AMC1400DW. Verify pinout compatibility and isolation ratings before substitution.

FAQ

What certification does the isolation barrier hold?

The isolation barrier is certified as reinforced insulation per DIN EN IEC 60747-17 (VDE 0884-17) and UL1577.

How does the device handle missing high-side supply?

It features a missing high-side supply detection capability that triggers a failsafe differential output voltage state.