The schematic below represents the electrical circuit of one channel.
Output is not tri-stated; it is forced to a low state when undriven or unpowered.
Push-pull, tri-state output
The output is referenced to the Vref voltage supplied by the user via a dedicated input pin on the DB37Fconenctor of the chassis in which the module is installed. Each bank of 16 channels can be referenced to a different voltage level.
Two consecutive outputs(for example DOUT_0 and DOUT_1, DOUT_2 and DOUT_3) may be connected in parallel for higher (double) current capability.
The maximum current is 50 mA DC per output, sink or source with no trip action. Higher currents will trip the current protection.
Use of a damping circuit (a serial resistor-capacitor circuit tied to the GND as close as possible to the unit under test) may be necessary to minimize ringing and over/undershoot depending on the distance between the simulator and the unit under test, The following parameters are usually a good starting point for the RC values: R=150Ω, C = 100pF.
Typical Use Cases
The characteristics of the module make it suitable in simulations of applications such as: