ADUM2211SRWZ

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Digital Isolators are becoming increasingly important components in the telecommunications industry. The ADUM2211SRWZ isolator is one of the latest offerings from Analog Devices and is designed to meet the stringent requirements of this rapidly developing market. This isolator is a highly integrated, low-cost, single-bit optocoupler that provides low-power digital signal isolation from its power supply and power source. The ADUM2211SRWZ features a 3.3V CMOS logic level input/output capability and a 0.45 second fast turn-on time. With a maximum propagation delay of 1.5µs, the ADUM2211SRWZ isolator is ideal for applications that require optimized electrical noise immunity in tight timing sockets.

The ADUM2211SRWZ is designed for use in a variety applications. Its most prevalent application is in industrial control systems where the digital isolator isolates the primary MCU control system from the secondary DC or AC power system. This application corresponds to applications in elevators, motor control, machine tools, and process control systems. Additionally, the ADUM2211SRWZ is used in medical equipment such as patient monitors, infusion pumps, and defibrillators for isolated safety relays. Lastly, the ADUM2211SRWZ is also found in linear performance motors, automation systems, and aircraft systems.

In a typical scenario using the ADUM2211SRWZ, the power source is connected to the primary control system. The secondary (isolated) side is connected to the power system. A resistor connects the input signal from the primary side to the output signal on the secondary side. The isolator then takes the input signal and provides it to the secondary side in the form of a pulse-width modulation (PWM) signal. The secondary side then receives the signal, and provides a voltage level to the power system that corresponds to the input signal. This allows the primary side to control the power system without actually making a physical connection to it.

The ADUM2211SRWZ isolator works on the principle of voltage isolation. This means that the output signal is not electrically connected to the primary side. The electrical isolation is made possible by the optocoupler, which uses a light emitting diode (LED) to send light pulses across an optical barrier, and a phototransistor to detect the light pulses on the other side. This allows the signal to travel across the optoelectronic barrier without any electrical connection. The advantage of this approach is that it eliminates any chance of electrical noise transferring across the isolator.

The ADUM2211SRWZ offers a variety of features that make it a viable choice for digital isolation applications. It features a wide operating temperature range of -40°C to +125°C. Additionally, the isolator has excellent EMC (electromagnetic compatibility) characteristics, making it suitable for use in noisy environments. The ADUM2211SRWZ also offers low power consumption, fast switching times, and low total harmonic distortion. All these features make the ADUM2211SRWZ a robust and reliable isolator and an ideal choice for digital isolation applications.

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