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TI's Amplifier, modulator boast robust isolation barrier
7/19/2011 |
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Texas Instruments Inc. has introduced an isolated amplifier and a delta-sigma modulator that enable 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.
According to TI, the AMC1200 is a 4kV 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 20MHz, externally-clocked, isolated delta-sigma modulator that provides 40 percent better linearity than the competition, TI said.
The AMC1200 isolated amplifier features high precision with a maximum nonlinearity of 0.07 percent and gain drift of 56ppm/C. It has reduced power consumption with a low high-side supply current of no more than 8mA at 5V. The device is fully specified over the extended industrial temperature range of -40-105ºC - 20º higher than competitive offerings. It promises easy connection to ADCs and MCUs with 5V or 3.3V operation on the low side and self-adjusting common mode voltage.
The AMC1204 isolated delta-sigma modulator offers ultra-high accuracy with best-in-class nonlinearity of ?8LSB, maximum, and a digital output that allows designers to define digital filter characteristics based on system requirements. It 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.
TI offers a variety of tools and support to speed design for customers. Design tools for the AMC1200 include an evaluation module, as well as simulation models. An evaluation module and IBIS model are available for the AMC1204.
The AMC1200 is available now in a 10 x 7mm SOIC package for a suggested retail price of $2.20 in 1,000-unit quantities. The AMC1204 is also now available in a 10x10mm SOIC package for a suggested retail price of $3.45 in 1,000-unit quantities.
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