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SPI, short for Serial Peripheral Interface, is a high-speed, full-duplex, synchronous communication bus. Thanks to its minimal pin usage—only four wires—it helps save valuable chip pins and simplifies PCB layout, making it both space-efficient and convenient. Due to these practical features, many ADCs prefer to use the SPI bus for transmitting data.
For instance, consider the SPI isolation chip 6N137 from Toshiba. This optocoupler device operates at 5V with a maximum speed of 10Mbps and an operating temperature range of 0°C to 70°C. It has an isolation voltage of 2500Vrms and comes in a DIP8 package, offering just one isolation channel. However, this limited functionality restricts its application in more demanding environments, especially in industrial fields where harsh conditions like high common-mode voltages can disrupt SPI communications.
In contrast, Analog Devices' ADuM315x series digital isolators provide a superior alternative. These isolators are designed to handle complex industrial data acquisition tasks more efficiently. Unlike the 6N137, which requires a complicated circuit involving numerous resistors and transistors for proper operation, the ADuM315x can function correctly with just two standard bypass capacitors. Compared to competing optocoupler or digital isolator solutions, the ADuM315x is over six times faster, significantly smaller, and costs 85% less. This makes it ideal for boosting the throughput of data acquisition systems, ensuring faster response times and higher performance.
The ADuM315x family supports a wide range of high-speed SPI communication applications, including distributed control systems, PLCs, and sensor monitors in industrial automation, instrumentation, and motor control. With only three components needed for a complete SPI digital isolation solution, compared to the 18 to 32 required by alternative digital isolators or optocouplers, the ADuM315x simplifies design processes and reduces costs.
Models like the ADuM3151, ADuM3152, and ADuM3153 offer four high-speed channels in various configurations, along with three additional low-data-rate channels for auxiliary/control signal isolation. Meanwhile, the ADuM3154 provides a slave-selectable multiplexing system capable of managing up to four slave devices with a single isolator. It supports a 17MHz clock and requires only two pins, saving one GPIO pin from the MCU. The slave selection is achieved via two pin-addressable slaves, with the fast SS channel used to gate the slave for precise timing.
Analog Devices, headquartered in Norwood, Massachusetts, is renowned for designing and manufacturing high-performance analog, mixed-signal, and digital signal processing (DSP) ICs. They boast over 15,000 employees and more than 4,700 patents, producing innovative products such as data converters, amplifiers, RF ICs, power management solutions, MEMS-based sensors, and signal processing chips.
To aid engineers in evaluating these isolators, Analog Devices provides evaluation boards like the EVAL-ADUM3150Z, EVAL-ADUM3151Z, and EVAL-ADUM3154Z. These EV kits allow access to all data channels, multiple connectivity options, support for Tektronix active probes, cable termination, and edge-mounted PCB coaxial cable connectors, making them user-friendly for engineers during development.
In conclusion, the ADuM315x series represents a leap forward in SPI isolation technology, offering enhanced performance, reduced complexity, and cost savings over traditional optocouplers like the 6N137. Its versatility and efficiency make it a preferred choice for modern industrial applications requiring robust and reliable data isolation.