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DS91M040: Hysteresis

Takashi Onawa
Genius 13200 points
Part Number: DS91M040
Other Parts Discussed in Thread: SN65MLVD206B

Hi Team,

Could you tell me if DS91M040 has built in hysteresis on differential input?
It looks DS91M040 has two threshold points, Vit+ and Vit-. Can I say it has 36mV typ built in hysteresis.

Regards,

Takashi  Onawa

  • 0
    TI__Mastermind 43795 points

    Hi,

    There is no built in hysteresis on the MLVDS inputs.

    The typical Vit+ and Vit- thresholds are within 4 or 6mV of each other for Type 1 and Type 2 inputs.

    Regards,

    Lee 

  • 0 in reply to Lee Sledjeski
    TI__Genius 13200 points

    Hi Lee-san,

    Thanks for your prompt response on this.

    I'm a little bit confused, so Could you tell me the definition of the Hysteresis?  

    SN65MLVD206B has the hysteresis but I didn't understand well the difference between SN65MLVD206B and DS91M040. The functionality looks almost same.

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Mastermind 43795 points

    Hi,

    The SN65MLVD206B Type 1 receiver inputs have a hysteresis of 25mV.  This means the positive and negative going thresholds have a 25mV difference.  The DS91M040 input does not have this voltage difference.

    This change in voltage threshold improves the noise margin in a device and increases the device resistance to oscillate or transfer input noise to the output signal.

    For example a device with no hysteresis switches LH or HL as the input crosses a 0.00V threshold.  A device with 50 mV of hysteresis may switch LH when the input is at 0.025V and switch HL when the input is at -0.025V.

    Regards,

    Lee