SN75LVDT390DR

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The SN75LVDT390DR is a low-voltage differential-transformer (LVDT) that operates from a single +5V supply. The device detects the absolute linear displacement of a magnetic core relative to the center of the transformer for its distance measurements. It is designed for applications such as industrial process control, robotic tooling, and medical instrumentation. The SN75LVDT390DR provides four independent channels for measuring up to four separate lines of motion.

The SN75LVDT390DR converts differential input signals provided by an externally controlled coil into a single-ended output voltage. Each of the four channels includes both a differential input and a single-ended output. A high linearity is maintained over a wide dynamic range. This allows the driver to accurately measure linear distances, even when the distance range is much larger than the resolution. The SN75LVDT390DR is capable of self-sensing, with a maximum measurement range of ±1 millimeter accuracy. A wide supply-voltage range of 3.2V to 5V is supported, with low power consumption of 125mW max when fully loaded.

The SN75LVDT390DR is an industrial-grade LVDT driver that provides an ideal solution for applications such as motion control, motion sensing, and position sensing. It offers the best-in-class linearity of 0.05% and a maximum output swing of 200mV. The driver is also designed to minimize EMI issues and reduce noise pick-up. Its shielded construction prevents EMI/EMC interference from external sources, while its differential inputs provide high common-mode rejection (CMRR) and a wide dynamic range.

The SN75LVDT390DR is designed to operate with low power and little noise. The maximum standby current is only 6mA, making the device suitable for portable systems. The device runs at a low frequency to reduce EMI concerns, while the pre-assembled magnetic-sensing core eliminates the need for external coil connection. This simplifies the mechanical integration of the device into a system, allowing more compact designs.

The SN75LVDT390DR uses a coil-and-magnetic-core sensing system to measure linear motion. The external coil is driven by a sine wave and produces a magnetic field. This field interacts with a core and produces an electromotive force (EMF) in the core. The EMF is proportional to the magnetic field and hence to the linear displacement of the core within the field. When the EMF is passed through the LVDT, it is converted into a single-ended voltage output.

The SN75LVDT390DR is ideal for applications where space and power considerations are important. With its low power requirements, it can be used in battery-powered systems. The shielded construction prevents EMI interference, while the differential inputs prevent noise pick-up and provide high CMRR. The device is available in a 28-pin SSOP package, making it suitable for ultra-compact design. Additionally, the pre-assembled magnetic sensing core simplifies the mechanical integration of the device into a system.

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