ADG509FBRW

The ADG509FBRW from Analog Devices is a CMOS analog multiplexer designed for applications requiring fault protection. It features four differential channels, allowing it to switch one of four differential inputs to a common differential output, controlled by 2-bit binary address lines.

This multiplexer provides significant protection for both the device and the signal source. It can withstand continuous overvoltage inputs ranging from -40 V to +55 V. During fault conditions, such as power loss, all channels turn off, and only a few nanoamperes of leakage current flow, preventing damage to connected circuitry and sensors.

Key features include low on-resistance (300 Ω typical), fast switching times (250 ns max ON and OFF), and low power dissipation (3.3 mW max). The switches are guaranteed to be break-before-make, protecting input signals from momentary shorting. Trench isolation is employed to prevent latch-up.

The ADG509FBRW is available in a 16-SOIC package and is suitable for surface mount applications. Its fault and overvoltage protection capabilities make it ideal for existing multiplexer applications and new designs demanding enhanced signal integrity and device safety.