Tuesday 02 September 2008
Op mps with Integrated EMI filters
National Semiconductor has introduced three new operational amplifiers (op amps) with integrated electromagnetic interference (EMI) filters that maintain the accuracy of analogue systems by reducing the effects of radio frequency (RF) interference.
The LMV83x op amps deliver the industry’s highest EMI rejection ratio (EMIRR) of 120 dB, thereby eliminating EMI-induced errors. They also feature 3 MHz unity gain bandwidth while operating on only 240 uA of supply current. This yields a power-to-performance ratio of 80 uA per MHz, which places these devices among National’s PowerWise® family of energy-efficient products.
The LMV831 single, LMV832 dual and LMV834 quad EMI-hardened op amps reduce development time and board size by minimising the need for metal shielding, filters and extra components. They are well-suited for use in phone accessories, medical instruments, precision weigh scales and other industrial electronic equipment that are sensitive to electromagnetic disturbances in noisy environments.
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