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TINA/Spice/TLV1701-Q1: TLV1701-Q1

Inam Shah
Intellectual 290 points
Part Number: TLV1701-Q1
Other Parts Discussed in Thread: TINA-TI, LM2903-Q1, , TLV1701

Tool/software: TINA-TI or Spice Models

Dear Members,

I have used Simulation model LM2903-Q1 Spice model to do my Simulations.

From Specifications, I can see TLV1701-Q1 has less propagation delay and should meet my requirements well.

But unfortunately, using the Spice model of TLV1701 (non-automotive) I can't see the same performance or better than LM2903-Q1.

Is it that I can use TLV1701-Q1 and expect the performance better than LM2903-Q1 or at least the same ?

Maybe Spice Models have some issue ?

Greetings,

Inam

  • 0
    Guru 140200 points
    Hi Inam,

    take care with these spice models. They do not always show the typical performance of the chip. Do only take the datasheet specifications as reference! Only the datasheet is telling the ultimate truth. :-)

    Kai
  • 0
    TI__Mastermind 49876 points

    Hello Inam,

    The propagation delay changes with input overdrive.This is common to almost all comparators.

    The TLV1701-Q1 has a graph showing the change in prop delay from 100mV to 1V (Fig 8). The LM2903-Q1 does not have a graph, but the Switching Characteristics table shows the prop delay going from 1.3us at 100mV, to 300ns at 5V.

    The LM2903-Q1 model is very simple (and old), and does not accurately model the propagation delay.

    The TLV1701 model is a little more involved, but does not model the change in prop delay over input overdrive.

    As Kai said, please refer to the graphs and tables for actual operation.

    And note that "Input Overdrive" is the amount of input signal OVER the threshold voltage, NOT the total input voltage change. So if the threshold is 1V, and your signal went from 500mV to 1.1V, the input overdrive is 100mV (NOT 600mV). So the smaller the overdrive, the slower the response.