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Current monitor offers improved temperature drift

Posted: 07 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:current monitor? measurement accuracy? wide temperature range?

Zetex Semiconductors has introduced a low-cost current monitor producing a current output signal with a typical error less than 1 percent. Housed in the 5-pin SOT23 package and with a 2.5V to 20V common mode voltage range, the ZXCT1020 provides a versatile current measurement solution for a wide range of applications, from low-voltage portables to automotive circuitry.

Converting the voltage developed across a sense resistor into a ground referenced current output, this high-side current monitor is simply configured using low-cost external resistors. As a result, the device output can be scaled independently of the sense resistor, using one resistor to set the transconductance and another to set the overall gain and output impedance.

According to Echo Li, sales VP at Zetex Asia Pacific, the device's low on-chip offset trimming brings a significant improvement in performance for very small sense voltages at high current levels. For such conditions, accuracy is further enhanced by the device's very low minimum operating current consumption, typically 25?A.

The current monitor's improved temperature drift characteristics helps reduce calibration requirements by maintaining accuracy over a wide temperature rangeits ambient temperature range of -40C to 85C makes it suitable for the most arduous industrial operating conditions. The ZXCT1020 will also serve as a precision programmable current source in a range of applications including high linearity oscillators and F/V converters.

The ZXCT1020 is now available.

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