Flexible, high precision, low drift PLC/DCS analog output module circuit diagram

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Circuit function and advantage

The circuit shown in Figure 1 is a full-featured, high-voltage (up to 44 V), flexible, programmable analog output solution that meets most of the programmable logic controller (PLC) and distributed control system (DCS) applications. Claim.

The AD5662 is a low power (0.75 mW @ 5 V), rail-to-rail output, 16-bit nanoDAC® device. The AD5751 is an industrial current/voltage output driver with full input and output voltage ranges and reference voltage requirements. Consistent.

The ADR444 is a low drift (B level maximum of 3 ppm/°C), high initial accuracy (B level maximum of 0.04%), low noise (typically 1.8 μV pp, 0.1 Hz to 10 Hz) reference It provides reference voltage for AD5751 and AD5662 to ensure ultra-low noise, high precision and low temperature drift. The circuit provides all typical current and voltage output ranges, 16-bit resolution with no missing codes, 0.05% linearity, and less than 0.2% total output error.

The ADuM1301 and ADuM5401 provide all the signal isolation required between the microcontroller and the analog signal chain. The ADuM5401 also provides a 5 V isolated power supply. The circuit also has some important features that support industrial applications, such as on-chip output fault detection, CRC checking for packet error prevention (PEC), and flexible power-up options, making it ideal for building robust industrial control systems. In high-volume production, it maintains consistent performance without the need for external precision resistors or calibration procedures, making it ideal for PLC or DCS modules.

Figure 1. Basic analog output circuit for a single channel (schematic diagram, not showing all connections and protection circuits)

Figure 1. Basic analog output circuit for a single channel (schematic diagram, not showing all connections and protection circuits)
Flexible, high precision, low drift PLC/DCS analog output module circuit diagram

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