Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLC2654: TLC2654

Part Number: TLC2654
Other Parts Discussed in Thread: TLV333, OPA4187, OPA2187, TLV2333, TLV4333, OPA187

Dear Sir/Madam,

I found the TLC2654 library on your web page. This library only has 5 pins. Do you have a library that includes 8 pins for the TLC2654?

Your sooner reply would be very much appreciated

Khadija  

  • Khadija

    I'm unclear what you are seeing. I checked the CAD/CAE symbols for the 8 pin SOIC and 8 pin DIP and they are correct.
    Make sure you are looking at the symbols at the bottom of this page:
    www.ti.com/.../pinout-quality

    Regards
    Dennis

    If this answered your question please click the green "This Resolved My Issue" button.
  • Thank you for getting back to me. I am looking for the .mod/.lib files to add them to PSpice/LTSpice. I dowloaded them already but they are not wit 8 pins. The file only has 5 pins.
  • Thank you for getting back to me. I am looking for the .mod/.lib files to add them to PSpice/LTSpice. I dowloaded them already but they are not with 8 pins. The file only has 5 pins.
  • Hello Khadija,

    This is a very old device with a very old SPICE model. It looks like only the standard five op amp pins were implemented. The model is suitable for basic functionality and AC checks, but I wouldn't suggest designing a production system based on only your simulation results. We are in the process of updating all of our op amp models, but it will be some time until we get to this one.

    In the meantime, we have a large portfolio of high-performance, modern chopper op amps if you are looking for the DC precision that a chopper offers. I'd suggest considering one of these parts that have a very accurate SPICE model as a starting point for your design.

    What are the power supply voltage, bandwidth, and offset/drift requirements of your system? If other specs are important please let me know as well and I can make some recommendations.

    Best regards,

    Ian Williams
    Applications Engineer/SPICE Model Developer
    Precision Amplifiers

  • Thank you for your reply.
    The reason why I picked this op amp is because I read this paper www.ti.com/.../slyt204.pdf and I wanted to implement the principle of chopping as it reduces the noise which is what I am interested in.
    Yes please could you give some names of other op amp choppers you recommend please! Do they work in the same way?
    For the bandwidth spec. up to 10KHz.
  • According to my previous email, hope to get back from you as soon as possible regarding the chopper amplifier.

    Thank you 

    Khadija 

  • Hello Khadija,

    The requirement of 10kHz bandwidth can be met by just about any of our chopper amplifiers. You can see the selection of our choppers (also called zero-drift amplifiers) at the link below. All of them work using the same method described in the app note.

    http://www.ti.com/amplifier-circuit/op-amps/precision/products.html#p2192=Zero%20Drift

    It would be helpful to know more about your requirements or your system to help narrow down your options. For example:

    • What is your desired gain? If you are using gain > 1 then the bandwidth requirement will increase.
    • Are you using high-voltage ( > 5.5V) or low-voltage ( ≤ 5.5V) power supplies? Single or dual supply?
    • Do you have a current consumption limit?
    • What is your required offset voltage and offset voltage drift?

    Best regards,

    Ian Williams

  • I do not mind at this stage if it is single or dual it is fine. I want something that works for up to 10KHz that would be fine! Just a unity gain of 1.

    The offset voltage as minimum as possible.

    Please let me know which ones you recommend?

    Looking forward to hearing back from you

    Khadija 

  • Hi Khadija,

    Your target specs are quite easy to meet.

    If you need low-voltage (Vs ≤ 5.5V), I recommend the TLV333. It is also available in a dual (TLV2333) and quad (TLV4333). Bandwidth is 350kHz, Vos is 2uV typical. If you need high-voltage (Vs ≥ 5.5V), I recommend the OPA187. It is also available in a dual (OPA2187) and quad (OPA4187). Bandwidth is 550kHz, Vos is 1uV typical.

    Best regards,

    Ian Williams