I have a question LTC2870.
In the case of RS 422 10 Kbps communication, the capacity of CL isHow much can you drive up to?Excerpt from the following data sheet. Is it 1nF with RS232?
Please see below figure for the data rate vs cable length. on the top of the curve, the date rate is limited by resistance of cable on which the signal will be attenuated. 10kbps is just fell in this region. The typical capacitance of cable is 17pf/ft, then the allowed capacitive load reaches 68nF, althought it is not critical now.
Goes to RS232 mode, yes, if the data rate is 500Kbps, the maximum capacitive load is 1nF, if decrease data rate to 100kbps, it could supports 5nF. As LTC2870/1 contains 2 RS232 tranceiver together, the figure you paste shows a way to let them working together to increase the capacitive load capability. Please keep in mind that, EIA 232 specify a maximum 2500pF capacitive load just under 20kbps.
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