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(This is a follow-up to an earlier question of mine.)

I would like to use the GTL2000 bi-directional translator IC to facilitate level translation between a 3.3V circuit and a 5V circuit (including bi-directional Digital and Analog I/O, SPI, I2C lines, etc.)

Now the datasheet of the GTL2000 convinces me that this is the right IC for the job. However, at certain points, the datasheet describes the GTL2000 as a "low voltage translator" and that it does "voltage level translation".

So before I order the part, I am trying to understand what this means -- What is the difference between a voltage-level translator versus a logic-level translator? Can I use this IC in the application I stated above?

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  • \$\begingroup\$ What exactly do you mean by "bidirectional analog I/O"? \$\endgroup\$ – Dave Tweed Dec 14 '12 at 12:19
  • \$\begingroup\$ @DaveTweed: The "bi-directional" was a prefix for the Digital lines, and by Analog I/O, I was referring to Analog input and "Analog"/PWM-output \$\endgroup\$ – boardbite Dec 14 '12 at 13:57
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    \$\begingroup\$ Just as long as you understand that the GTL2xxx devices are only going to function as a clamp for analog inputs, and probably somewhat nonlinear at that. If you want analog inputs scaled from one range to another, you'll need to use a resistive voltage divider instead. \$\endgroup\$ – Dave Tweed Dec 14 '12 at 14:34
  • \$\begingroup\$ Ah, thanks, that would be important! Just read through the datasheet and I think I understand why this is now. Wonder if I can find parts that incorporate multiple resistive dividers for the more-than-one analog lines in my case. \$\endgroup\$ – boardbite Dec 15 '12 at 6:41
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Yep, this will work just fine. Here is a great article on voltage level translation that Anindo Ghosh shared with me that explains all the different types of voltage translators: http://www.ti.com/lit/an/scea035a/scea035a.pdf

Logic Level = Voltage Level

In a 5v system, 5v(voltage) is high(logic) and 0v(voltage) is low(logic) and same for 3.3v...

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