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TL082: About Vom of TL082CPS at another Vcc

Hiromu Susami
Prodigy 430 points
Part Number: TL082

Tool/software:

Hello experts,

I plan to use TL082CPS as a comparator.

[Supply voltage]

VCC=+12+5%

VEE=-12-5%

[Question]

  • What is the voltage (min/max) on the positive and negative sides of the output in this situation?

I read datasheet "6.12 Electrical Characteristics", it shows (min)Vom=±12V,（typ) ±13.5V ,at Vcc＝±15V, 25℃. So I want to know the situation at Vcc＝±12V(±5%), 25℃.

Best regards,

Hiromu

  • 0
    Guru 299300 points

    With a 12 V supply, the drive strength should be similar.

    Figure 6-44 shows that the output voltage range depends mainly on the load.

    I would strongly suggest the more modern TL082H, which is cheaper and has rail-to-rail outputs.

  • 0 in reply to Clemens Ladisch
    TI__Prodigy 430 points

    ＞With a 12 V supply, the drive strength should be similar.

    Could you explain this statement a little more specifically? 

    At the situation Vcc＝±12V(±5%), Vom will be like this?

    • Vom=±9V(±5%) (min), ±10.5V(±5%) (typ)
  • +1 in reply to Hiromu Susami
    Guru 299300 points

    Yes; the voltage drop from the rails is 1.5 V typ, 3 V max.

  • +1 in reply to Clemens Ladisch
    TI__Mastermind 25380 points

    Hello Susami-san,

    Clemens is right. This device doesn't have what we call a rail to rail output, as a result, the output voltage can only get 1.5V from either of the supply rails. 

    If you are needing something with rail to rail output, we have a number of other devices that can do that. As Clemens mentioned the TL082H is a more modern part and doesn't have the same output swing limitations as the TL082. 

    Best Regards, 

    Robert Clifton