MAX355CWE

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• Introduction:

  The MAX355CWE is a heavily-integrated analog switch that is designed as a general-purpose switch for analog signal applications in industrial and commercial applications. The MAX355CWE is capable of switching input voltages up to 15V and currents up to 1A. It has an on-board quad-pole SPDT switch, a comparator, and two voltage dividers. The MAX355CWE is able to selectively route signals to other electronic devices in a system.

• Application Field

  The MAX355CWE is typically used for signal routing, analog multiplexing, and signal isolation in applications such as motor control, instrumentation, audio, power control, and other signal switching applications. The MAX355CWE is especially suitable for applications that require maximum signal isolation and signal integrity with minimal power consumption.

• Design

  The MAX355CWE features an integrated 4-pole SPDT switch with excellent on-resistance, an integrated pre-driver circuit, and a gated comparator with hysteresis. The switch is designed with active low inputs, allowing the output to be monitored in the logic circuit; this allows the switch to be set to actively control a digital signal according to logic input. The integrated pre-driver circuit allows the MAX355CWE to switch faster than traditional analog switch designs. The pre-driver also saves board space by providing a full-duplex digital interface between the analog switch, the digital output and the external logic. Additionally, the integrated gated comparator reduces the effect of noise on the output signal, ensuring signal integrity. The MAX355CWE also offers a wide range of voltage, temperature, and current range (50V, -40°C to +125°C, and 400mA) to meet the most stringent requirements.

• Working Principle

  The MAX355CWE is a quad-pole SPDT switch and driver with an integrated gated comparator. When a logic signal is applied to the control input (EN), the integrated switch is open or closed, depending on the logic level applied. When the switch is closed, the voltage is routed through the switch to the output. The comparator gate monitors the voltage at the output and provides hysteresis to eliminate any noise and jitter created by external signals. The comparator gate also detects under- and over voltage conditions and is able to switch the output off in order to protect the IC from damage.

• Conclusion

  The MAX355CWE is a general-purpose, robust analog switch for signal routing and analog multiplexing in industrial and commercial applications. The pre-driver circuit allows the switch to switch faster than traditional analog switch designs, while the gated comparator ensures signal integrity. The integrated SPDT switch is capable of switching voltages up to 15V and currents up to 1A, and the wide range of voltages, temperatures, and current ratings make the MAX355CWE suitable for a wide range of applications.

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