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MAX44284 Current Sense Amplifier Slide 10
Some applications of current-sense amplifiers need to measure currents accurately even in the presence of both differential and common-mode ripple, as well as a wide variety of input transient conditions. Analog Devices' MAX44284 allows two methods of filtering to help improve performance in the presence of input common-mode voltage and input differential voltage transients as shown in the slide. The internal architecture of the MAX44284 suppresses the DC offset, 1/f noise, and accumulates at higher frequencies so that they can be filtered out. Hence, minute AC disturbances can be observed at 10 kHz and 20 kHz. It is recommended to add an output filter after the MAX44284 to avoid noise and unwanted frequency disturbances at the output with 5 kHz, -3 dB fC with suggested values of C and R: 2.2 nF and 1.8 kΩ, respectively.
PTM Published on: 2015-02-13