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ADS8588SEVM-PDK: Suitable ADC with Sensor

ttd
Mastermind 8700 points
Part Number: ADS8588SEVM-PDK
Other Parts Discussed in Thread: ADS8588S, ADS8568, ADS8168, ADS131M08, ADS131E08, ADS1278, ADS127L01, ADS8548, ADS8528, ADS8555, ADS8556, ADS8568EVM-PDK, ADCPRO

Hi,

I'd like to use sensor "VS-BV203" with ADS8588SEVM-PDK.

If you have any recommendation ADC for  "VS-BV203", could you share it?

■Target Specification

8ch

over 150ksps

16bit

Best Regards,

ttd

  • 0
    TI__Mastermind 46235 points

    Hi tdd,

    The vibration Sensor (VS-BV203) has a low voltage output (3-5.5V from build-in amplifier based on its power supply) and a wide frequency range (10Hz - 15kHz), ADS8588S ADC has integrated analog-front-end(AFE) including PGA and RC filter on each channel, the internal filter has only 16kHz bandwidth under +/-5V input range. Hence, a ADC without internal filter will be a good option for your application. 

    If simultaneous sampling structure is desired, ADS8568 (8ch,16-bit) is one option, you will only use half of dynamic input range because this ADC supports bipolar input(+/-5V or +/-10V).

    If non-simultaneous sampling structure is accepted, ADS8168 (8ch, 16-bit) is can be used, maximum sampling rate per channel is limited to 125ksps.

    Regards,

    Dale

  • 0 in reply to Dale Li
    Mastermind 8700 points

    Hi Dale,

    Thank you for your reply.

    My target is simultaneous sampling structure, so  ADS8568 (8ch,16-bit) may be better.

    I am confirming  ADI(EVAL-AD7768), so If you have any advantage, could you share it?

    Maybe this is ΔΣADC, so it include digital filter after ADC.

    https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-AD7768.html#eb-overview

    I'will connect Zedboard in the future, so FMC ADC EVM is more better.

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Mastermind 46235 points

    Hi tdd,

    I will check with my co-worker to see if he can jump in to support you to select a proper delta-sigma ADC from TI to compete with AD7768.

    One thing I would remind you, a delta-sigma ADC will have a latency and I'm not sure if this is a concern for your design.

    Regards,

    Dale

  • 0 in reply to Dale Li
    TI__Guru 53736 points

    Hi TTD,

    The ADS131M08 or ADS131E08 are good devices to consider as well, though they are not as fast as 150kSPS unfortunately.

    The ADS131M08 is a very small ADC (7x7mm TQFP) if that is a concern for your system.

    We also have the ADS1278, which can operate up to 144 kSPS.

    Let me know if you have any questions about these devices.

    -Bryan

  • 0 in reply to Dale Li
    Mastermind 8700 points

    Hi Dale,

    Do you have SAR ADC of simultaneous sampling structure with unipolar input(0-5V) for full of input range with the vibration sensor (VS-BV203)?

    I couldn't find 8ch/16bit products for these. If you have low grade(4ch / 14bit or 12bit) or high grade(16ch / 18bit ) ADC products for simultaneous, could you share it?

    >If non-simultaneous sampling structure is accepted, ADS8168 (8ch, 16-bit) is can be used, maximum sampling rate per >channel is limited to 125ksps.

    →"sampling rate per channel is limited to 125ksps" means that 8us interval for next channel sampling(not simultaneous )?

    Best Regards,

    ttd

  • 0 in reply to Bryan Lizon86
    Mastermind 8700 points

    Hi Bryan,

    Thank you for introducing ΔΣADCs. I think that ADS1278 is better than ADS131M08 or ADS131E08.

    According to the datasheet, it said only unipolar description. Is it possible for ADS1278 to use unipolar(0-5V) with  the vibration Sensor (VS-BV203) ?

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Guru 53736 points

    Hi TTD,

    Yes, the ADS1278 can be used for vibration sensors. You can take a look at this reference design for more information about using our ADS127x products for vibration measurements: https://www.ti.com/tool/TIDA-01471

    In this case, the 1-ch, 512kSPS ADS127L01 is used, but the operating principles are the same.

    The input range on the ADS1278 is +/-VREF, so if VREF = 5V then you can measure +/-5V. This would allow you to measure a 0-5V signal, though you would lose 1 bit of resolution. However, at the highest data rate, the ADS1278 does not provide 24-bit noise free anyway, so that should not be a problem.

    Let us know if you need anything else here.

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Mastermind 46235 points

    Hi ttd,

    To response your questions to me:

    1. We do not have 8-ch simultaneous sampling SAR ADC with 0-5V unipolar input range. ADS8568 family is the best SAR ADC without LPF:

    ADS8568:  8-ch, 16-bit

    ADS8548: 8-ch, 14-bit

    ADS8528: 8-ch, 12-bit.

    Also, ADS8556 and ADS8555:  6-ch, 16-bit

    2. Your understanding about the sampling interval on ADS8168 is correct. Also, ADS8168 is the best SAR ADC without LPF if non-simultaneous sampling structure can be accepted.

    Thanks&regards,

    Dale

  • 0 in reply to Dale Li
    Mastermind 8700 points

    Hi

    I tried to install ADC Pro of ADS8568EVM-PDK with win10.

    However it can't accept to install into win10 PC. According to user guide, it supports only win7.

    Our company already doesn't have win7 PC. Do you have ADC Pro for win10?

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Mastermind 46235 points

    Hi ttd,

    The ADCPro software for  ADS8568EVM  is not compatible with Windows 10. We are going to upgrade the entire platform for ADS8568 including the GUI and EVM board, we are working on that. Thanks for understanding.

    Regards,

    Dale

  • 0 in reply to Dale Li
    Mastermind 8700 points

    Hi Dale,

    Thank you for your reply.

    When will you release for win10? Next month or few month later or next year?

    Maybe it depends on the situation of corona virus.

    I'm happy to get it as soon as possible to evaluate it.

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Mastermind 46235 points

    Hi ttd,

    We are working on pcb layout now, I think probably it may be released by the end of this year, thanks for understanding.

    Regards,

    Dale