Silicon Labs Si8920 galvanic isolation amplifier. The device's low-voltage differential input is ideal for measuring voltage across a shunt resistor or anywhere where a sensor must be isolated from a control system. The company says that the output is a differential analog signal that is amplified by 8.1 or 16.2 times.
The Si8920's extremely low signal delay enables the control system to respond quickly to fault conditions or load changes. Low offset and gain drift ensure accuracy over the entire operating temperature range. Excellent common-mode transient immunity means that the Si8920 provides accurate measurement results even in the presence of high-power switches in motor drive systems and inverters.
The Si8920 isolation amplifier utilizes Silicon Labs' proprietary isolation technology. According to UL1577, it supports withstand voltages up to 5.0kVrms. Compared with other isolation technologies, this technology can achieve higher performance, reduce changes in temperature and service life, tighter part matching and longer service life.
Applications include industrial, hybrid vehicle and renewable energy inverters, AC / Brushless and DC motor controls and drivers, variable speed motor control in household white goods, and isolated switch mode and UPS power supplies.
Mouser also offers Silicon Labs' Si890ISO-KIT evaluation kit, which quickly connects to a shunt resistor to check the functionality of the Si8920 isolation amplifier. The evaluation kit contains Si8920BC-IP equipment. This allows connection to a shunt resistor, which generates a voltage of up to ± 200mV at full load.
The kit has test points for monitoring the input, output and power of the device. Surface mount component pads can be used for input or output filter circuits. The Si8920ISO-KIT evaluation kit demonstrates the functionality, accuracy, stability, and low signal delay of the Si8920 amplifier.
