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Применения > > 4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications

4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications (cn0229)

The circuit shown in Figure 1 is a multichannel, flexible, analog output solution with only two analog components and meets most requirements for multichannel I/O cards, programmable logic controllers (PLCs), and distributed control systems (DCSs) applications. The AD5686R quad, 16-bit nanoDAC+ with rail-to-rail buffered outputs combined with four of the AD5750-2 industrial current/voltage output drivers provide all the typical output current and voltage ranges with 16-bit resolution, no missing codes, 0.05% linearity, and less than 0.1% output error.


An ultralow drift (2 ppm/°C typical), 2.5 V voltage reference with high drive capability (up to ±5 mA) is integrated in the AD5686R and provides the reference voltage for both the AD5686R and the AD5750-2. This guarantees low noise, high accuracy, and low temperature drift for the circuit.


The ADuM1301 and ADuM5400 provide 2500 V rms isolation both on power, and all the necessary signals between the analog signal chain and the host controller.


For multichannel I/O card applications that need more than 4 channels, several AD5686Rs can be connected in a daisy chain, and no additional external digital I/O circuits are required. This minimizes the cost, especially for high channel count isolated applications.


The circuit also contains key features for industrial applications, such as on-chip output fault detection, packet error checking (PEC) by the CRC, flexible power-up options, and ESD protection (4 kV for the AD5686R, human body model and 3 kV for the AD5750-2, human body model), making it an ideal choice for robust industrial control systems. No external precision resistors or calibration routines are needed to maintain consistent performance in mass production, thereby making it ideal for PLC or DCS modules.



Figure 1. Simplified Schematic of the Analog Output Circuit (All Connections and Protection Circuits Not Shown)

Возможности

  • Quad channel Current and Voltage Outputs
  • 16-bit Resolution for PLC Systems
  • Digitally Isolated from Application

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4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications  cn0229

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