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Table of Contents


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The OP5353 features 32 optically isolated input channels that operate in the 4-50V voltage range.

Main Features

  • 32 optically isolated input channels

  • 4V to 50V input voltage range

  • 30V maximum reverse protection

  • 3.6mA current threshold

  • All inputs are sampled simultaneously, at up to 10 MSPS

  • Choice of sink or source input connections (anode and cathode side signals available)

Channel Description

The optically isolated inputs accept a wide input voltage range, from 4 to 50 Volts. They have a low threshold current; typically 3.6 mA. Each input has reverse voltage protection of up to 30 Volts provided by a Schottky diode.

The schematic below represents the electrical circuit of one channel, from the Din+/Din- input signals coming for the unit under test (on the right) to the Din_FPGA signal going to the FPGA processor of the real-time simulator (on the left).Image Removed


  • When current flows from Din+ to Din-, the output of optocoupler (A) is low and the Din_FPGA signal is low.

  • When no current flows, the optocoupler output (A) is high and the Din_FPGA signal is high.

  • Both Din+ and Din- pins (anode and cathode sides) are routed to the DB37F connector of the simulator and made available to the user. 

  • The maximum current is 3.6mA 


Typical Use Cases

The circuit makes it possible to use the module for activation or open-circuit detection, both in the high or low active state.

Typical high side activation (user high Dout)


Typical low side activation (user low Dout)


Typical high side open circuit detection


Typical low side open circuit detection

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For compatibility of this card, please consult the Software compatibility and Hardware compatibility tables.