Burr-Brown Releases New INA138 Current-Shunt MonitorFebruary 06, 2000 by Jeff Shepard
Burr-Brown Corp. (Tucson, AZ) recently announced the INA138, a miniature current-shunt monitor designed for use in current-measurement applications. The INA138 converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from one to over 100.
According to Burr-Brown, the special input circuitry can accurately measure differential voltages that exceed its own power supply. The unipolar, high-side INA138 is designed to draw 25 microamps quiescent current to permit shunt measurement with minimal error. Input common mode and power-supply voltages are independent and can range from 2.7V to 36V. The device also features a single resistor gain set, allowing adjustment of its output voltage for any value of shunt resistance.
"The INA138 solves the very common and often challenging measurement of high-side current-shunt monitoring," said Bruce Trump, strategic marketing manager at Burr-Brown. "As important, the INA138 provides this complete current-measurement circuit in a tiny package at an extremely low price."
The INA138 is packaged in an SOT-23-5 and is specified for the -40 degrees to +85 degrees C industrial temperature range. In quantities of 1,000, pricing for the INA138 is $0.95 each.