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ADS1281: Does ADS1281 no longer available?

Yu-Hung
Expert 1130 points
Part Number: ADS1281
Other Parts Discussed in Thread: ADS1263, ADS1287, ADS1283, ADS1287D, ADS1282

Hi,

Today I want to buy ADS1281 on TI store.

But I saw this message in my cart.....

So what is the TI's recommendation to replace my datalogger on seismology? ADS1263?

(3 channels simultaneous sampling)

YHH

  • 0
    TI__Mastermind 44640 points

    Hi YHH,

    I may not be the best person to support TI Store issues, but I can certainly forward this to someone who can if needed...

    I did a quick check of the store today and it looks like the ADS1281IPW is in stock in every region:

    If you were trying to request samples, then the TI Store might not have allowed you to sample this device. I would try removing the device from your cart and adding again. If you run into any additional issues please let me know I'll make sure to notify someone who directly supports the TI Store.

    Best regards,
    Chris

  • 0 in reply to Christopher Hall
    Expert 1130 points

    Hi Christopher Hall,

    Yes, I know we can buy from online store.

    But I would like to know what is the new seismology solution when ADS1281 discontinued.

    YHH

  • 0 in reply to Yu-Hung
    TI__Mastermind 44640 points

    Hi YHH,

    I'm sorry, I misunderstood your question...

    I don't know of any plans to discontinue the ADS1281 anytime soon; however, if you check out the "Parametrics" table on the ADS1281 product page, you'll see all of the other seismic ADCs that are similar to the ADS1281:

    Some of the main differences to know about the other ADS128x devices is that they add a integrated PGA front-end and all of them are controlled through register configurations (pin mode is no longer support). For best SNR at the lowest power consumption, I would recommend the ADS1283. For even lower power consumption, there are the ADS1287 (single ADC) and ADS1287D (dual ADCs).

    I hope that helps,
    Chris

  • 0 in reply to Christopher Hall
    Expert 1130 points
    Hi Chris,

    Really thanks for your info.

    ADS1283 is the newest.
    I apply the sample/datasheet of ADS1283 from website.

    Do you have plan to make EVM for ADS1283?

    BTW, ADS1282 is 2 channels (typo?) and I remember the analog input range of ADS1281/1282 can be reached to -2.5V(AVSS-0.1).

    YHH
  • 0 in reply to Yu-Hung
    TI__Mastermind 44640 points
    Hi YHH,

    Unfortunately, there is no plan for an ADS1283EVM at this time.

    The ADS1282 is 2 channels multiplexed. I'm not quite sure why the the parametrics tables onlys say 1 channel; however, I often get questions about whether or not the ADS1282 can be used to achieve high data rates/throughputs when multiplexing with the FIR filter. It is important to know that the settling time of the FIR filter takes many conversion cycles (~63 conversion periods) so even though there are two channels, I would consider this device to be a single channel, with the second channel provided only as a means of providing a calibration signal.

    You also brought up another important different between some of the ADS128x devices...with the integrated PGA, the analog input range will be slightly limited due to the PGA's common mode range...
    - For the ADS1282 and ADS1283, the FSR is "+/- Vref/(2*PGA)" and the absolute input range is from AVSS+0.7V to AVDD-1.25 V.
    - For the ADS1287 and ADS1287D, the FSR is "+/- Vref/(PGA)" and the absolute input range is from AVSS+1V to AVDD-1.25 V.

    Best regards,
    Chris
  • 0 in reply to Christopher Hall
    Expert 1130 points
    Hi Chris,

    Thanks for your reply.

    YHH
  • 0 in reply to Christopher Hall
    Prodigy 70 points
    Hi Chris,

    It appears that both the analog and digital specifications of the ADS1283 are very similar to the ADS1282. The ADS1283 has a CS/ pin, and uses less power and is in a smaller package, which is all good. On the surface, it looks like it is almost a drop in replacement for the ADS1282.

    What is the planned availability of this part? Will it be less or more expensive than the ADS1283?

    - Kent