Digital Isolators
Products (2)
ADUM141D1BRWZ-RL7 - Quad Digital Isolator 150Mbps | Analog Devices
The ADUM141D1BRWZ-RL7 is a quad-channel digital isolator from Analog Devices, based on iCoupler technology. It combines high-speed CMOS and monolithic air core transformer technology to provide superior isolation performance compared to optocouplers and other integrated couplers. This device offers 3.75 kV RMS isolation, a data rate of 150 Mbps, and a common-mode transient immunity (CMTI) of 75 kV/µs. It is available in a 16-pin SOIC-W (wide body) package, suitable for surface mount assembly. A digital isolator is a component that provides electrical isolation between two circuits while allowing digital signals to pass across the isolation barrier. It is essential in applications where ground potential differences, noise, or safety requirements demand galvanic isolation. Digital isolators are part of the broader category of interface ICs, which manage signal integrity and communication between different parts of a system. They are commonly used in industrial automation, medical equipment, and communication systems. Key features of the ADUM141D1BRWZ-RL7 include its 3:1 channel configuration (three forward channels and one reverse channel), unidirectional data flow, and support for supply voltages from 1.7V to 5.5V on both sides. The device operates over a temperature range of -40°C to +125°C, making it suitable for harsh environments. It also features fail-safe outputs that transition to a predefined state when input power is absent, ensuring predictable system behavior. Technically, the ADUM141D1BRWZ-RL7 uses iCoupler technology, which employs microscopic transformers to transfer data across the isolation barrier. This approach offers advantages such as higher data rates, lower power consumption, and better reliability compared to optocouplers. The device is designed to meet stringent isolation standards, with a working voltage of 3.75 kV RMS and a CMTI of 75 kV/µs, ensuring robust performance in noisy industrial environments. Typical applications include general-purpose multichannel isolation, SPI/data converter isolation, and industrial field bus isolation. The device is also suitable for medical equipment where patient safety requires galvanic isolation. Its high data rate and low propagation delay make it ideal for high-speed communication interfaces. When designing with this device, ensure proper PCB layout to maintain isolation spacing and minimize parasitic capacitance. The supply pins should be decoupled with 0.1 µF capacitors placed close to the pins. Also, consider the fail-safe output behavior when input power is lost, as it may affect system state.
ADUM1441ARWZ - Micro-Power Quad Digital Isolator | Analog Devices
The ADUM1441ARWZ is a micro-power, 4-channel digital isolator from Analog Devices, utilizing the iCoupler technology that combines high-speed CMOS and monolithic air core transformer technology. It provides outstanding performance characteristics superior to alternatives, with a data rate of 2 Mbps and a withstand voltage of 2500 Vrms. The device operates over a supply voltage range of 3.0 V to 3.6 V on both VDD1 and VDD2, and is specified over the temperature range of -40°C to +125°C. It is available in a 16-lead SOIC-W package (ADUM1441ARWZ) and also in a 16-lead QSOP package (ADUM1441ARQZ). A digital isolator is a component that provides galvanic isolation between two circuits while allowing digital signals to pass across the isolation barrier. It is essential in applications where ground potential differences, noise, or safety requirements necessitate isolation, such as in industrial automation, medical equipment, and communication systems. Digital isolators replace optocouplers in many designs due to their higher speed, lower power consumption, and better reliability. Key features of the ADUM1441ARWZ include ultra-low power consumption: in standard operating mode with internal refresh enabled (ENx = 0), the current per channel is less than 10 μA; with internal refresh disabled (ENx = 1), it drops to less than 1 μA. This makes it ideal for battery-powered and energy-harvesting applications. The device also features a common-mode transient immunity (CMTI) of 25 kV/µs, ensuring reliable operation in noisy environments. The ADUM1441ARWZ uses a refresh mechanism to maintain output states when the input is static, which is a key differentiator from older isolators. The internal refresh can be disabled via the ENx pins to further reduce power consumption, but this requires the input to be toggled periodically to maintain the output state. This architecture allows for extremely low quiescent current, making it one of the most power-efficient digital isolators available. Typical applications include SPI, I2C, and UART isolation in industrial field buses, isolated sensor interfaces, and power supply control loops. The low power consumption and small package make it suitable for space-constrained designs. When designing with this device, ensure that the ENx pins are configured correctly to achieve the desired power-performance trade-off, and consider the need for periodic signal toggling when internal refresh is disabled.