• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 47 subscribers
  • Views 810 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Expected Lifetime for TLC2543

marc itrich
Prodigy 70 points
Other Parts Discussed in Thread: TLC2543, ADS8664, ADS8028, ADS7950, ADC124S021

Does anyone have any insight info about the expected lifetime of TLC2543?

We have successfully used it for almost 15 years but now we starting to design the next generation of the board and we are worring if it will be available for the next 15 years.

Furthermore we only need to have 4 channels in the new design.

Any suggestions for a replacement with same or better performance (INL, DNL = +-1LSB; Offset Err = +-1,5LSB; Gain Err = +-1 LSB; Total unadjusted Err = +-1,75LSB; 5kHz Sample rate)?

  • 0
    TI__Intellectual 1130 points

    Hi Marc

    Thanks for your question.

    We have no plans to obsolete the TLC2543 so you can definitely continue to use this device into your new design.

    As an alternative option, we have some new devices as well that you can consider to use in your new design:

    1) ADS8664/8 - Family of pin-compatible 12/14/16/18 bit, 4/8-ch devices with integrated analog front end and reference circuit. This device may potentially eliminate all analog signal conditioning that you may be using with TLC2543 in your current design. In terms of performance, it is better than the TLC2543 on most parameters.

    2) ADS7950 and ADS8028 are two other multi-channel 12-bit options but they will have worse offset/gain specs compared to the TLC2543.

    If you can share some more details about your application requirements, including the input signal range, bandwidth, interface & temp range, then we can provide you with more information. 

    Thanks

  • 0 in reply to Vinay Agarwal
    Prodigy 70 points

    Hi Vinay,

    thank you for your fast responce. I will take a closer look at the parts you suggested.

    The application had a simple resistor devider + cap as input circuit until now. fg was 1kHz; Input resistance 10K; Sample rate 5kHz. So input signal range of the adc isn't essential - this can be adapted. Temp range 0-50°C. Digital interface is connected to an FPGA - this can also be adapted.

    I took a look at ADC124S021 - this is slightly worser in max. values of INL, DNL but better with offset error. What do you think? Is there any data for the  total unadjusted error available?

    Kind regards - Marc

  • 0 in reply to marc itrich
    TI__Intellectual 1130 points

    Hi Marc

    The offset of ADC124S021 is slightly better (1.3 LSB) compared to TLC2543 (1.5 LSB), but the gain error is worse (1.5 LSB compared to 1 LSB in TLC2543). This device is supported out of a different group in TI so we don't have the TUE data for the device.

    Please let us know if you need any more information about the alternate devices that we had suggested to you in the previous post.

    Thanks

  • 0 in reply to Vinay Agarwal
    Prodigy 70 points

    Hi Vinay,

    the resistor devider in the front end will bring much more gain error to the interface even if they have 0,1% - So I think the 0,5LSB more can be discussed. I will give the ADC124 a try.

    If I need some more date I will come back to you.

    Thanks again - Marc

  • 0 in reply to marc itrich
    TI__Genius 16890 points

    Hi Marc,

    In answer to your original question, there are no plans to discontinue the ADC124S021.

    Mike