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TLV3801: The problem for TLV3801 Output Voltage

hutianqi
Prodigy 10 points
Part Number: TLV3801
Other Parts Discussed in Thread: TLV3501,

Hi, I designed the fundamental circuit for TLV3501, but the output voltage was 350 mV and 250 mV for Q and Q bar output. The simulation and Instruction all said it should be 1.08 V and 1.42V, I would like to know what happened to it, Our circuitry is the same.

Another question is, I found if I set consistent DC into V- input, the actual reference is half of this voltage, is that right?

Screenshot 2023-11-15 145651.png

  • 0
    TI__Genius 11701 points

    Hi,

    Thanks for reaching out. How are you taking your measurements? 50ohm or Hi Z termination on the scope? Is it possible you're on AC coupling?

    For your second question, sounds like the scope is on 50ohm termination but the generator/input signal itself is not set to 50ohm load. You would need to match it. 

  • 0 in reply to Chi Nguyen1
    Prodigy 10 points

    Hi, Sir

    Thanks for your reply. As you suggested, the generator/input signal itself is set to Hi Z load. Now it's normal when I set Hi Z termination on the scope.

    And another question is, I intend to use it as a comparator. Set the reference voltage to 30 mV into V-, and signal into V+. In fact, I found that the LVDS output appears when the signal may be 32 mV, but the output is unstable until the signal reaches 40 mV, then the output is stable if the signal is more than 40 mV,  is that right?

  • 0 in reply to hutianqi
    TI__Genius 11701 points

    Hi,

    Thanks for your question. Please note that TLV3801 has internal hysteresis of 2 mV and a typical offset of +- 0.5mV and max offset of +5mV. So, your signal may need to be larger than a few mV's above your reference to "overcome" it so that the output can respond.