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ADG839: Negative voltage switching

Question asked by emilzacharia on Sep 27, 2017
Latest reply on Sep 29, 2017 by mayp

Hi,

I found the following circuit in a reference board where they use ADG839 as a load switch to a negative voltage.

The VIN varies from 0V to -3.3V referenced to GND.

GPIO_IN is a GPIO input from an FPGA which can give HIGH(2.5V) and LOW(0V).

Using the GPIO, they control whether VIN is passed to VOUT or not.

 

I couldn't understand the circuit eventhough I tried.

Please help me to understand how it works and design a similar circuit in which GPIO_IN is a GPIO input from an FPGA which can give HIGH(1.8V) and LOW(0V).

Also, VIN varies from 0V to -2.4V referenced to GND in my case.

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