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The OP5340-1 module provides 16 differential analog input channels, sampled at up to 400 kS/s, for measuring ±20V input signals.

An 8-channel version of the module previously available, the OP5340-2, is now discontinued.

Main Features

  • 16 analog input channels
  • 16-bit resolution
  • Simultaneous sampling at 400 kS/s
  • Voltage range ±20V
  • Factory-calibrated

Channel description

The OP5340-1 module uses eight 16-bit dual-channel analog to digital converters. The figure below represents a simplified schematic of one channel. It is composed of three stages:

  • the first stage consists of one operational amplifier that works in differential input mode and allows gain adjustment; 
  • the second stage, the level shifter, adapts the signal for the A/D converter input; 
  • the third stage consists of the conversion by the A/D converter of the input signal into a digital signal which is transferred via the carrier board to the FPGA chip of the real-time simulator.

Voltage range

The default voltage range is ±20V. This value is obtained by using two resistor values, R1 and R2, to form the input stage :

The Vout value at the output of the amplifier is then obtained by the formula : 

$$V_{out}= \left( \frac{R2}{R1} \right) V_{in} $$


In order to keep the Vout range at ±1 V,  which maximizes the precision of the measurement, the resistor values are set to R1 = 499 kΩ and R2 = 25 kΩ :

The channel gain obtained with the default R1, R2 values is thus 1/20 :

Calibration

  • The card is factory-calibrated to ensure accurate output values with a maximum of ±20 mV absolute error on noise and offset.


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


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