New Industry Products

TI Isolated Amplifier, Modulator Enables High-Precision Current Measurement in Motor Control, Green Energy Applications

July 13, 2011 by Jeff Shepard

Texas Instruments Inc. (TI) introduced an isolated amplifier and a delta-sigma modulator that enable best-in-class shunt-based current measurement in motor control and green energy applications. The AMC1200 isolated amplifier and AMC1204 delta-sigma modulator allow designers to increase accuracy, temperature stability and immunity to magnetic fields in equipment such as ac drives, solar inverters and uninterruptible power supplies.

The AMC1200 is a 4-kV peak isolated amplifier providing 80-percent better linearity and gain drift compared to competitive devices while reducing power consumption by 50 percent. The AMC1204 is a 20-MHz, externally-clocked, isolated delta-sigma modulator that provides 40-percent better linearity than the competition.

Key features and benefits include: AMC1200 isolated amplifier – high precision with a maximum non-linearity of 0.07 percent and gain drift of 56 ppm/C; reduced power consumption with a low high-side supply current of no more than 8mA at 5V; fully specified over the extended industrial temperature range of -40 to 105°C –; easy connection to analog-to-digital converters (ADCs) and microcontrollers (MCUs) with 5 or 3.3V operation on the low side and self-adjusting common mode voltage. AMC1204 isolated delta-sigma modulator – non-linearity of ±8 LSB, maximum, and a digital output that allows designers to define digital filter characteristics based on system requirements; and includes an external clock interface to enable simultaneous measurement of multiple channels.

Both devices provide high electromagnetic interference immunity and a robust isolation barrier certified by UL 1577 and IEC 60747-5-2. The AMC1204 is also CSA-certified.

More news and information regarding the latest developments in Smart Grid electronics can be found at Darnell’s SmartGridElectronics.Net.