With industrial automation systems rapidly evolving, these systems require a more secure network infrastructure and better data collection for higher system efficiency overall. Analog Devices has worked together with designers of industrial process control systems for over 40 years to define, develop, and deploy complete signal chain solutions that are optimized for a wide array of applications.
With their industry-leading technologies and systems-level expertise, they bring reliability and innovations with precision control and monitoring solutions. These five featured products focus their applications in three areas; Field Instruments, Temperature Controllers, and Programmable Logic Controllers (PLCs)/Distributed Control Systems.
Field Instruments
Field Instruments are required to control and measure variables that include temperature, pressure, level, and flow. They also perform liquid analysis to analyze what liquid type you are using.
One popular Analog Devices microcontroller used in field instruments is the ADuCM360. It is a low power precision analog microcontroller with an ARM cortex M3 with dual sigma-delta ADCs. It is designed for direct interfacing to external precision sensors in both wired and battery-powered applications. The dual 24-bit ADCs ensure signal reading accuracy; have four internal channels for monitoring DAC, temperature sensor, IOVDD/4, and AVDD4. This is a great microcontroller for environmental monitoring.
Figure 1: SDuCM360’s Block Diagram (Source: Analog Devices)
Field instruments need to communicate with other instrumentations and one solution is the AD5700. It is designed and specified to operate as a HART FSK half-duplex modem. The AD5700 integrates all of the necessary filtering, modulating, demodulating, signal detection, and signal generation functions, requiring only a few external components. With its 0.5% precision internal oscillator, it greatly reduces the board space requirement making the AD5700 ideal for line-powered applications in both master and slave configurations and an optimal choice for low power loop-powered applications with its maximum supply current consumption of 115µA.
Figure 2: AD5700’s Block Diagram (Source: Analog Devices).
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Temperature Controllers
High performance temperature control solutions require the designers to consider multiple components and the impact of each on the overall system to obtain the low noise and drift specifications. Products and signal chain solutions tailored for RTD and thermocouple applications are offered by Analog Devices.
The ADT7420 is a 16-bit digital I2C temperature sensor that has an accuracy of +/- 0.25oC. It is easy to use, having no calibration or correction required by the user and has low power consumption. It contains an internal band gap reference, a temperature sensor, and a 16-bit ADC to monitor and digitize the temperature to 0.0078oC resolution. The ADT7420 has excellent long-term stability and reliability with high accuracy for industrial instrumentation and medical applications.
Figure 3: ADT7420’s Block Diagram (Source: Analog Devices)
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Programmable Logic Controllers (PLC)/Distributed Control Systems (DCS)
PLCs and DCSs can be seen as the brain of the control system in modern manufacturing and processing plants. They send, receive, and process data from sensors, control valves, and actuators from the control system. Analog Devices offers efficient and leading technology products for PLCs and DCSs to help engineers meet today’s design challenges.
We recommend the ADuM3150, as it applies to PLCs/DCSs. The ADuM3150 is a 3.75kV, 6-channel, SPIsolator digital isolator for SPI with delay clock. This digital isolator optimizes timing for SPI since the channels (CLK, MO/SI, MI/SO, SS SPI bus signals) operate with 14 ns propagation delay and 1 ns jitter. It also provides two additional independent low data rate isolation channels, one channel in each direction. Data is sampled and serialized for a 250 kbps data rate with 2.5 µs of jitter in the slow channels.
Figure 4: ADuM3150’s Block Diagram (Source: Analog Devices).
Another option is the AD7175-8, which is a 24-bit, 250 kSPS, sigma-delta ADC with 8/16 channels and true rail-to-rail buffers. It has a maximum channel scan rate of 50 kSPS for fully settled data and has an output data rates range from 5 SPS to 250 kSPS. This ADC integrates key analog and digital signal conditioning blocks to allow users to configure an individual setup for each analog input channel in use. It also provides easy to drive high impedance inputs by integrating true rail-to-rail buffers on the analog inputs and external reference inputs.
Figure 5: AD7175-8’s Block Diagram (Source: Analog Devices).
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These are just some of the featured products from Analog Devices that can be used for process control and industrial automation solutions. Analog Devices provides a wide variety of other reliable and efficient products that work with your designs and allow you to get to production faster.