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AM26C31-EP: How to Estimate Total Input Current from 5V Supply With respect to Number of Channels Used

Kiran Kumar Valiveti
Prodigy 30 points
Part Number: AM26C31-EP
Other Parts Discussed in Thread: AM26C32-EP,

Tool/software:

Hi, 

When We are Trying to Use AM26C31-EP to Convert Single Ended Signal to Differential Signal and Used in Conjunction with AM26C32-EP, What Will be the Supply Current Requirement w.r.t the number of channels used?

Thanks,

Kiran

  • 0
    Guru 285430 points

    The worst-case supply current for both devices is 3.2 mA + 15 mA = 18.2 mA. The typical current through the bus (supplied by the driver) is 31 mA per channel with 100 Ω termination. So the typical total would be about 142 mA; calculate with at least 200 mA to be safe.

  • 0 in reply to Clemens Ladisch
    Prodigy 30 points

    Thanks Clemens...Does that mean, the total current requirement of 5V Supply would be 142mA and 200mA on Safer Side?

  • +1 in reply to Kiran Kumar Valiveti
    Guru 285430 points

    There is no worst-case specification of the bus current (because it depends on the bus, not on the chip itself). The typical current is about 140 mA; you must apply a safety factor to that. (And if you're using different termination, the current will change.)

  • +1
    TI__Guru 60540 points

    Hi Kiran,

    As Clemens pointed out, the line drivers will be the devices with the most current consumption. Each driver will typically output 3.1V across a 100 ohm load (31mA) {4x channels =124mA typical). You can then add up the supply currents from each datasheet. 

    You should assume a higher margin incase you get devices with slightly stronger outputs and variances in the resistor tolerances. 

    Did you have any additional questions or did Clemens answer everything?