Monitor Provides Accurate Current Measurement at Low Cost
Accuracy as good as 1%
The new ZXCT1020 from Zetex Semiconductors is a low cost current monitor that can produce a current output signal with a typical error less than 1%. The device provides a versatile current measurement solution for a wide range of applications from low voltage portables through to automotive circuitry.
Housed in a five-pin SOT23 package and with a wide, 2.5V to 20V, common mode voltage range, the ZXCT1020 converts the voltage developed across a sense resistor into a ground-referenced output current. Designed for high side current monitoring, the device is simply configured using low cost external resistors. As a result, its output can be scaled independently of the sense resistor using one resistor to set the overall gain and another to set the transconductance in order to match the load impedance.
The ZXCT1020 is very 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 25µA.
The current monitor’s improved temperature drift characteristics help reduce calibration requirements by maintaining accuracy over a wide temperature range. The ZXCT1020’s ambient temperature range of -40ºC to +85ºC makes it suitable for the most arduous industrial operating conditions. The ZXCT1020 can also be used as a precision-programmable current source in a range of applications including high linearity oscillators and F/V converters.
Features
Low cost current monitor
Accuracy can reach 1%
Wide common mode voltage range: 2.5V to 20V
Five-pin SOT23 package
Gain set via external resistor
Transconductance independently controllable for impedance matching
Low on-chip offset trimming
Low minimum operating current, typically 25µA.
-40ºC to +85ºC operating temperature range
Applications
Low voltage portables
Automotive circuitry
High side current monitoring
Precision programmable current source
High linearity oscillators
F/V converters
For further information, including FREE ZXCT1020 Samples and Datasheet, pleaseclick here
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