TRS3122E: Icc(dynamic) of TRS3122E

Hi Takashi,

This is probably going to depend on the distance of cable you're communicating with. Figure 1 in the datasheet showcases this, at higher datarates you will see a higher current draw. The the X axis, it is your cable distance (longer cable generates a larger capacitive load). An example I like to use is 1m of cat5 cable is about 50pF. So 100m would be around a 5nF load. Using figure 1 at 250kbps you get around a 40mA current draw. You can divide this down by data rate, where 125kbps will get you 20mA and ~60kbps get you 10mA. 30kbps is 5mA. 15kbps is 2.5mA. 7.5kbps is 1.25mA. These all assume your cable is 100m of cat 5 for example.... 

-Bobby