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AD5383-5 maximum current that can be supplied by every voltage output?

Hi,

I'm new here so I introduce myself. My name is Pep Canyelles, an electrical and electronic engineer working at the moment in a research institute.

Currently we are designing a PCB board to control an array opf 64 LD VCSELs as part of a Marie Curie fellowship.

To do so we are going to use the AD5383-5 14 bits 32 outputs 100-Lead LQFP package.

Page 4 of the datasheet gives current specs for the given model in output characteristics.

I would like to ask if the short circuit current of 40mA is the maximum current that the voltage output can provide or if it is just the 1mA marked as load current.

If the answer is the first supposition, 40mA, then that would mean that 32 x 40 mA = 1.28 A in just a single chip so I guess that we would need to apply cooling and considering this feature very seriously.

Many thanks for your time, greetings

Pep

AD5383.pdf
  • The specified load for each channel is +/-1mA. This means that if your circuit draws 1mA or less from the pin the output voltage will stay within 1LSB of the no-load value. This is the maximum recommended operating load.

    As you start to take more than 1mA from the output the voltage will move away from the set value. The more current you take the further away the voltage will be.

    The short circuit current spec of 40mA means that you will never get more than 40mA flowing from the pin.

    The amount of current used by the AD5383 causes the part to self-heat and there is a maximum safe limit. The absolute maximum ratings specifies that for every 1 Watt used the chip will heat by 44degC. This should be considered if you plan to exceed the 1mA load limit.