AMC1202DWVR

Overview

The AMC1202DWVR is a precision, basic isolated amplifier manufactured by Texas Instruments in an 8-pin SOIC package. It features a fixed gain of 41 V/V and a ±50-mV input voltage range optimized for shunt resistor current sensing. The device operates on 3.3-V or 5-V supplies on both high-side and low-side circuits. Key electrical specifications include a maximum offset error of ±50 μV, a gain error of ±0.2%, and a common-mode transient immunity (CMTI) of 100 kV/µs minimum. It provides galvanic isolation certified to 3000 VRMS per UL1577 and 4250-VPK basic isolation per DIN VDE V 0884-11.

Feature Summary

• Optimized for direct connection to low-impedance shunt resistors with a ±50-mV input range.
• Provides high common-mode transient immunity and resistance to magnetic interference via capacitive isolation barrier.
• Includes integrated missing shunt and missing high-side supply detection for system diagnostics.
• Meets CISPR-11 and CISPR-25 standards for low electromagnetic interference.

Applications

• Shunt-resistor-based current sensing in HEV/EV charging piles
• Current sensing in HEV/EV on-board chargers (OBC)
• Current sensing in HEV/EV DC/DC converters
• Current sensing in HEV/EV traction inverters

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official orderable addendum to ensure correct packaging and temperature grade. Confirm that the application design maintains the required creepage and clearance distances on the PCB to preserve the certified isolation ratings. Check for any recent product change notifications regarding manufacturing sites or materials.

Selection Notes

Select this component when a fixed gain of 41 is required for precision current sensing applications. Ensure the system can accommodate the specified ±50-mV full-scale input range. Verify that the operating environment stays within the -55°C to +125°C temperature range. Consider the 3000 VRMS isolation rating if working voltages exceed standard low-voltage limits.

Part Context

The AMC1202 belongs to Texas Instruments' family of precision isolated amplifiers designed for high-reliability industrial and automotive applications. It utilizes a delta-sigma modulation scheme to transmit signals across a SiO2-based capacitive isolation barrier. This architecture distinguishes it from traditional digital isolators by providing analog output proportional to the input signal while maintaining galvanic separation.

Replacement Considerations

AMC1202CDWVR

FAQ

What is the function of the failsafe output feature?

The failsafe output ensures a defined differential output voltage state when the common-mode input voltage exceeds the overvoltage detection level or when the high-side supply is missing, aiding in system safety and diagnostics.

How does the AMC1202 handle magnetic interference?

The device uses a SiO2-based capacitive isolation barrier and digital modulation to transmit data, which provides high immunity to magnetic fields compared to other isolation technologies.