Part Number: ISO7720
What is the max load that this isolator can drive into? The datasheet shows an example load of 15pF, what cable does this represent?
Hi Jason,Thank you for posting, and welcome to E2E!The ISO77xx family of isolators should be configured to output a recommended current of up to 4mA in systems. This applies to all operating conditions."Low capacitance" cables typically have capacitances of 12 - 16pF/ft, however the switching characteristics of this device are defined for 15pF loads since cables of various lengths, types, and terminations can be configured to <15pF values.Which cable are you interested in using?Respectfully,Manuel Chavez
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In reply to Manuel Chavez:
We are trying to drive a wiegand output through this isolator and into a receiver. The end user will be responsible for cable selection but in most cases will be using a phoenix 5-conductor M12 CAN cable. The cable length will be in the 10-100 ft range. Is this isolator capable of driving into this cable?
Thanks for your help,
In reply to Jason Lamb:
ISO7720 accepts and outputs single-ended CMOS logic inputs/outputs and such logic signals are typically limited to traces on PCBs. Whenever there are cables and longer communications distances are involved, differential communication interfaces like RS-485 and CAN are used.
If you require communication in the range of 10-100 ft then I recommend using RS-485 transceiver on both ends of the cable. If you require isolation as well then you can use isolated RS-485 device. ISO1410 and ISO1500 are two of our latest isolated RS-485 transceivers that offer best overall performance. Let me know if this is something you would like to use. Thanks.
In reply to Koteshwar Rao:
Hope my inputs have answered your questions. I will go ahead and mark this as closed, if you do have any question then you reply to this E2E thread. Thanks.
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