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Using multiple RS232 isolation channels

Question asked by Hemant on May 17, 2012
Latest reply on May 22, 2012 by Hemant



We were considering the use of ADM3251E for multiple channel RS232 isolation, in which we may use upto 9 chips (A future products may use 17 channels). But I find that use of 9 x ADM3251E would need more than 1A supply current which is not acceptable. I am also worried about the EMI issue if there are so many isolation chips on a single PCB. Can you suggest a way to achieve this by using lesser current? The overall cost of the solution should not exceed the cost of the ADM3251E based solution. I was considering ADM3252E which appears to be more efficient, but I found the cost to be on the higher side at $ 8.49 compared to $ 2.99 for ADM3251 even if I were to use the ADM3252 for 2 channels.  Please suggest a way out. Also please let me know the EMI related precautions that we may have to take in handling so many isolated channels.