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Found a switch for a project, and want to make sure I understand it correctly.

This is the switch: (Mini-Circuits SWMA-2-50DR+).

Now, it has a TTL driver circuit with the inputs +5V, -5V, and TTL IN. The TTL IN has low threshold 0-0.8V and high threshold 2-5V.

Will it be possible to control the switch with a microcontroller that alternates its output between 0V and 5V, and is directly connected to the TTL IN input? Or is it necessary with some kind of circuit in between?

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  • \$\begingroup\$ The logic levels has maximum currents of 0.2mA (low threshold) and 5mA. I could put a 5kOhm resistor between the output of the MCU and the TTL IN, but wouldn't that drop the voltage on the input? \$\endgroup\$
    – paw
    Commented Mar 9, 2015 at 10:39

2 Answers 2

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Yes, that's the purpose of a TTL input.

(That's quite a small surface-mount package ..)

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Yes you are correct the RF switch can be controller using MCU. Make sure to check the MCU logic also any of 3.3V or 5.0V versions.

Logic High:2.0 to 5.0V

Logic Low: 0 to 0.8V

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