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Analog Switch for RS232 Level.

Hi everyone,

I need to work on an analog switch which will switch the RS232 (+/- 10VDC) signal from different RS232 serial communication.

I tried ADG333 with MAX232IDR, but it will draw too much current when RS232 is in Mark (-8.9VDC), then it will pull it to -0.89VDC.

Does everyone how to make analog switch for RS232 signals?

Thanks for help.

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  • The ADG333 will be fine for this as long as you use supply voltages wider than your expected signal swing.

    So for example with VDD=15V and VSS = -15V and GND=0, you should nave no trouble switching most RS232 level signals. The RS232 standard allows for larger voltage swings, but most real life interfaces don't.

    That being said, I think you would be better off translating the RS232 levels to TTL and then do your switching (with logic) and converting it back into RS232. The advantage is that you have the robustness of the RS232 transceivers and an easy and clean way to switch between channels at low voltage.

    Klaus

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  • The ADG333 will be fine for this as long as you use supply voltages wider than your expected signal swing.

    So for example with VDD=15V and VSS = -15V and GND=0, you should nave no trouble switching most RS232 level signals. The RS232 standard allows for larger voltage swings, but most real life interfaces don't.

    That being said, I think you would be better off translating the RS232 levels to TTL and then do your switching (with logic) and converting it back into RS232. The advantage is that you have the robustness of the RS232 transceivers and an easy and clean way to switch between channels at low voltage.

    Klaus

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