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TLE2082: alternative solutions

Adrian Ymeraj
Expert 3770 points
Part Number: TLE2082
Other Parts Discussed in Thread: LM6152, LM6172, TLV9052, TLV9062

Hello team,

my customer has been using so fa the TLE2082 but is requiring a replacement for it.

Specifically they need:

- package SO8

- Power supply ±12V and is going to be used in an acquisition chain

- Used as a current to voltage converter where the I=few microA and the gain is roughly 20K

- Used as an inverting op-amp with gain=4.7

- Used as buffer and driver for a few other stages

Do you have any suggestion in a possible replacement? Which one do you think would be a good fit between the LM6172IM and the LM6152?

Do you have any other suggestion?

Thank you in advance for your help.

Best regards,

Adrian

  • 0
    TI__Genius 15410 points

    Hi Adrian,

    The bandwidth of the LM6172 and LM6152 are significantly higher than the TLE2082 and the LM6152 does not appear to be unity gain stable so I would recommend using it in a buffer configuration. Does the customer need the bandwidth and slew rate much higher than the TLE2082?

    If they don't require a high bandwidth device I recommend taking a look at the TLV9062 and the TLV9052.

    If these parts don't work for the customer please provide us with the below requirements so we can make another recommendation.

    1. Bandwidth
    2. Slew Rate
    3. Quiescent current (Iq)

    Thank you,

    Tim Claycomb

  • 0 in reply to Tim Claycomb
    TI__Expert 3770 points

    Hello Tim,

    thanks for the explanation! The customer actually needs something similar to the TLE2082 since they are quite happy with its performance except for the bandwidth: they need a higher BW.

    Cost is also an issue in this application, something cheaper or the same as the TLE2082 will be appreciated.

    Any other suggestion is welcome.

    Thanks again!

    BR,

    Adrian

  • 0 in reply to Adrian Ymeraj
    TI__Genius 15410 points

    Hi Adrian,

    Since it sounds like the customer requires a high speed op amp (>50MHz) I am going to put you in contact with our high speed team. They should be able to find a suitable device for you.

    Thank you,

    Tim Claycomb

  • 0 in reply to Tim Claycomb
    TI__Expert 3770 points
    Cool Thanks Tim!

    BR,
    Adrian
  • 0 in reply to Adrian Ymeraj
    TI__Genius 17596 points
    Hi Adrian,

    There are many amplifiers that fit this description. Can you be more specific and respond to Tim's questions about requirements? What is the new desired bandwidth? What specifications made them choose the TLE2082? Is this a photodiode TIA application that will allow them to use a decompensated amplifier? Can you provide a signal chain schematic?

    Best regards,

    Sean
  • 0 in reply to Tim Claycomb
    TI__Expert 3770 points

    Hi Tim,

    the SR needed in this case is 30V/us. Could you please explain me where or how do you see the instability of the LM6152?

    I'll try to gather as much information as possibile and get back to you.

    Thanks and best regards,

    Adrian

  • 0 in reply to Adrian Ymeraj
    TI__Genius 15410 points

    Hi Adrian,

    Take a look at Figures 19 - 21. Notice that when in a gain of 1V/V (0dB) the phase is 0 or less. Because the phase is less than 45 degrees the amplifier is not stable in a gain of 1V/V.

    Thank you,

    Tim Claycomb