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TL3116: About Operation of TL3116 in the range exceeding Vicr.

Prodigy 220 points

Replies: 5

Views: 44

Part Number: TL3116

Hi team.

Our customer use this device in the range exceeding Vicr=2.5 [V].

Specific usage conditions are as follows.

Supply voltage : ±5 V

IN+ : -4.5V to +4.5V (This signal is 5 to 10kHz sign wave)

IN- : 0 to 200mV 

We want to know about operation of TL3116 in the range exceeding Vicr.

For example datasheet of LM111 series has the following description.

Do you have the information like this?

Best regards.

  • Hello teritama,

    The architectures of the TL3116 and LM111 series are different, and we cannot say if it will behave the same.

    Our recommendation is always to stay within the recommended operating conditions and no to rely on the behavior shown by a few devices.

    Comparators do not need an absolute voltage. Since they are comparing levels, it is possible to slightly attenuate the input signal to keep it within valid input range. As long as the input overdrive is similar (you are already well over 50mV), then the performance should be similar. And, may even be better since you are not violating the common mode range, which can cause delays due to overload recovery time.

    So attenuate the input by 2x (±2.25V), and shift the reference voltage to 100mV. You still have over 1V of overdrive, which will drive the comparator to it's fastest speed.

    Regards,

    Paul Grohe

    TI Comparators (CMPS) Applications Group

  • In reply to Paul Grohe:

    Hi Paul.

    Thank you for your quickly answer.

    I understood that this input voltage can cause delay due to overload recovery time.

    Do you have any information about specific delay time?

    Best regards.

  • In reply to teritama:

    We do not have any specific data to share at the larger overdrive voltages but the prop delay vs overdrive curve (Figure 6) indicates that at overdrives greater than 100mV, the prop delay will be between 6 and 7ns.

    Chuck

  • In reply to Chuck Sins:

    Thank you reply.

    > the prop delay vs overdrive curve (Figure 6) indicates that at overdrives greater than 100mV, the prop delay will be between 6 and 7ns.

    Figure 6 indicates until max 50mV .

    Is it OK to understand that the voltage changes above 50mV linearly in the same way?

    Is it OK to understand that the voltage changes above A linearly in the same way?

  • In reply to teritama:

    Not exactly. It will flatten out and remain constant at some point beyond 100mV.

    Chuck