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Date: 14th July 2011

Isolated amp and delta sigma modulator from TI for power electronics apps

Texas Instruments Incorporated has introduced AMC1200 isolated amplifier and AMC1204 delta-sigma modulator that enables shunt-based current measurement in motor control and green energy applications and to obtain increase in accuracy, temperature stability and immunity to magnetic fields in equipments such as AC drives, solar inverters and uninterruptible power supplies.

TI says 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 as per TI 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 8 mA at 5 V.
Fully specified over the extended industrial temperature range of -40 to 105 degrees C - 20 degrees higher than competitive offerings.
Easy connection to analog-to-digital converters (ADCs) and microcontrollers (MCUs) with 5-V or 3.3-V operation on the low side and self-adjusting common mode voltage.

AMC1204 isolated delta-sigma modulator:
Ultra-high accuracy with best-in-class non-linearity of +/- 8 LSB, maximum, and a digital output that allows designers to define digital filter characteristics based on system requirements.
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.

Available: Now
Package: 10-mm x 7-mm SOIC package
Price: $2.20 each for 1K units

For more info visit: www.ti.com

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