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Difference between level translator and Line Driver

Siddharth Gupta84
Intellectual 450 points
Other Parts Discussed in Thread: TMS320F28069

Hi,

Ref: TI  product lines:

1. Voltage Level Translation

2. Buffer/Driver/Transceiver

What is the exact difference between the two product lines. It seems one can voltage traslate from a Buffer/Driver/Transceiver also. Kindly suggest when to use a Buffer/Driver/ Transceiver and when to use level translator product.

I have 7 PWM outputs from TMS320f28069 (3.3V Logic), want to drive IGBT Driver (which requires 5V Logic). Which product line should I go with, to select an interface IC??

Thanking you,

Siddharth Gupta

 

  • 0
    TI__Expert 6335 points
    Siddarth,

    I'll take a look at the TMS320F28069 datasheet to see if a level translator is a suitable choice.

    Best Regards,
    Nirav
  • 0 in reply to Nirav Patel
    Intellectual 450 points

    Hi Nirav, 

    Thanks for the reply.

    What I am more interested is to know how

    1. To decide to go with voltage translator or a line driver/buffer; and what parameters to look for while deciding for translator or a driver.

    2. Construction wise what is the difference in the two.

    Thanking you,

    Siddharth Gupta

  • 0 in reply to Siddharth Gupta84
    TI__Guru 61690 points
    Hi Siddharth,

    you could use a buffer as a voltage translator. There are passive voltage translation which use pullup resistors for translation. Buffers can be considered as translation with drive . The LV1T family of logic translation devices are an example of this .
    for maximizing translation from a node to another , the input Vih/ Vil levels must be optimized. The standard CMOS translation for 5V will be 3.5V , which a 3.3V part wont work here since the Voh min will be about 2.9V . So the Vih of the level shifter device must be optimized for 2V to accept this.