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The OP4250-1 features 32 optically isolated input channels. All are sampled simultaneously for additional simulation accuracy. It is perfectly suited to interface real-life environment signals to TTL or differential levels for RT-LAB simulator, providing perfect electrical isolation and discharge protection.


  • 32 optically isolated input
  • All inputs are sampled simultaneously, at up to 10
  • Inputs are read in parallel for any size bus
  • Hardware configurable filters, and conditioning inputs for
  • Choice of sink or source inputs connection (anode and cathode side available).
  • Minimum current input of 3.6
  • 5V to 30V input voltage
  • 30V maximum reverse

Circuit description

The optically isolated inputs accept a wide input voltage range, from 5 to 30 Volts, according to user requirements. 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.

OP4250-1 isolated digital input drawing

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.

The signal conditioning module inputs have both anode and cathode sides available to the user (on the I/O connector).

Typical Applications

The diagrams below illustrate typical application examples.


Typical digital input circuit

The OP4250-1 cassette includes the OP5353-1 mezzanine card.

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