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TLV3811: TLV3811 (and similar TLV3811-Q1 , TLV3801, TLV3801-Q1) Power Supply Range - Input Impedence - Jitter

Nicola Lusardi
Prodigy 20 points
Part Number: TLV3811
Other Parts Discussed in Thread: TLV3801, , TLV3801-Q1

The following comparators (TLV3811, TLV3811-Q1 , TLV3801, TLV3801-Q1) have 3 imprecision into the datasheet

Power Supply

It's not clear whether Vee < 0 can be used when considering TLV3811. From Table 5-1, it appears that Vee can be a negative voltage, but nowhere are the minimum and maximum levels of Vcc and Vee reported. In Table 6.1, row 1, it seems that the difference between Vcc and Vee should respect a range (-0.3V; 5.5V), but not their absolute values. Is this correct? Can I have Vcc=2.5V and Vee=-2.5V, since Vcc-Vee = 5V?

Input Impedance

It appears from Figure 7.1 and paragraph 7.4.1 Input that the IN+ and IN- inputs are internally terminated at 50 Ohms. Is this correct? There is no table provided and Figure 7.1 does not show the complete circuit to understand it.

Random Jitter

How much is the random jitter of the device? no spec is present


Best

Nicola Lusardi

  • 0
    TI__Genius 11701 points

    Hi Nicola,

    Thanks for your questions. Yes, your understanding of supply voltage ratings is correct. The difference between VCC and VEE is what matters and needs to be in the range stated in the table. +2.5V and -2.5V would be valid since it is in the range of 2.7V to 5.25V. 

    The inputs are not internally terminated. The 50 ohm resistors in the figure are just for current limiting for the diodes. You will still need to do external 50 ohm termination if required. 

    For jitter, simulation results show its better than ~ 1ps; however, unfortunately, we did not directly test and measure jitter for this device. We do have a propagation delay skew specification (+-2.5ps) which could be helpful but it is defined by how much the low to high and high to low propagation delay varies between the OUT+ and OUT-. Sorry we could not give you the direct answer but I'd be curious to know how this specification helps you in your system design. I imagine what you care most would be how much the propagation delay varies for a given input condition from cycle to cycle, is that correct? 

  • 0 in reply to Chi Nguyen1
    TI__Genius 11701 points

    Nicola, closing this post as we have not heard from you. Feel free to reply back if you have any more questions.