SI8920AD-IS Silicon Labs

Si8920 ISOLATED AMPLIFIER FOR CURRENT SHUNT MEASUREMENT Features Low voltage differential input Low noise: 0.10 mVrms over 100 kHz bandwidth 100 mV and 200 mV options Low signal delay: 0.75 s High common-mode transient immunity: 75 kV/s Input offset: 0.2 mV Compact packages Gain error: <0.5% 16-pin wide body SOIC Excellent drift specifications 8-pin surface mount DIP 1 V/C offset drift 40 to 125 C 60 ppm/C gain drift AEC-Q100 Nonlinearity: 0.1% full-scale Applications Industrial, HEV and renewable Variable speed motor control in energy inverters consumer white goods AC, Brushless, and DC motor Isolated switch mode and UPS controls and drives power supplies Ordering Information: Safety Approvals See page 15. UL 1577 recognized VDE certification conformity Up to 5000 Vrms for 1 minute VDE0884 Part 10 (basic/reinforced insulation) CSA component notice 5A Pin Assignments CQC certification approval approval GB4943.1 Description The Si8920 is a galvanically isolated analog amplifier. The low-voltage differential input is ideal for measuring voltage across a current shunt resistor or for any place where a sensor must be isolated from the control system. The output is a differential analog signal amplified by either 8.1x or 16.2x. The very low signal delay of the Si8920 allows control systems to respond quickly to fault conditions or changes in load. Low offset and gain drift ensure that accuracy is maintained over the entire operating temperature range. Exceptionally high common-mode transient immunity means that the Si8920 delivers accurate measurements even in the presence of high- power switching as is found in motor drive systems and inverters. The Si8920 isolated amplifier utilizes Silicon Labs proprietary isolation technology. It supports up to 5.0 kVrms withstand voltage per UL1577. This technology enables higher performance, reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes compared to other isolation technologies. Patents pending Preliminary Rev. 0.8 11/16 Copyright 2016 by Silicon Laboratories Si8920 This information applies to a product under development. Its characteristics and specifications are subject to change without notice.Si8920 2 Preliminary Rev. 0.8