Texas Instruments has introduced an isolated amplifier and a delta-sigma modulator that provide shunt-based current measurement in motor control and green energy applications. The AMC1200 isolated amplifier and AMC1204 delta-sigma modulator can increase temperature stability and immunity to magnetic fields in equipment such as AC drives, solar inverters and uninterruptible power supplies. The isolated amplifier has a 4kV peak and it provides 0.07% linearity and gain drift of 56ppm/°C. It is claimed to reduce power consumption by 50% with a current supply of more than 8mA at 5V. The amplifier operates between -40 and 105°C and it connects with ADCs and MCUs with 5 or 3.3V. The modulator is a 20MHz isolated delta-sigma modulator that provides 40% linearity. It includes an external clock interface for measuring multiple channels. Both devices provide high electromagnetic interference immunity and a robust isolation barrier certified by UL 1577 and IEC 60747-5-2. Design tools for the amplifier include an evaluation module, and simulation models and that for the modulator includes an evaluation module and IBIS model. The amplifier is available in a 10x7mm SOIC package and the modulator is available in a 10x10mm SOIC package.
