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MSP430I2041----Data sheet

Ashutosh Pailwan1
Expert 2480 points

Other Parts Discussed in Thread: MSP430I2041, ADS1274

I am not able to find the detail data sheet which will indicate the exact specification of ADC

for example errors and sampling rate

clock details

  • 0
    TI__Guru 56685 points
    Hello,

    The datasheet for MSP430i2041 is located at the top of its product page (first document link). All of this information is located in that document.
    www.ti.com/.../MSP430i2041
  • 0 in reply to Jace H
    Expert 2480 points

    Dear

    In that it dosent specify about ADC

    for sampling speed, linearity errors

  • 0 in reply to Ashutosh Pailwan1
    TI__Guru 56685 points

    Hello,

    Please check the datasheet again. Section 5.6.7 of the datasheet gives you the specifications for the SD24. Table 5-22 and 5-23 give you performance data, including error and SINAD measurements, depending on your reference. Sampling rate is set by the user. Please see the User Guide of this part for more information on how to set the sampling and how to use the SD24 module properly.

  • 0 in reply to Jace H
    Expert 2480 points

    I want exact sample conversion time period of ADC

  • 0 in reply to Ashutosh Pailwan1
    TI__Guru 56685 points
    Hello,

    MSP430I24x has a fixed input clock for SD24 at 1.024MHZ. This is your sampling frequency. We have no other specifications available outside of what is contained in the datasheet.
  • 0 in reply to Jace H
    Prodigy 20 points
    I have the same question, and after checking the datasheet I'm still not clear. I expected to find a graph/table of number of effective bits versus sample rate, but that seems to be missing. For our project I need to be able to get about 20+ bits at 5Hz from each of the 4 channels, is this possible?

    Thanks, Andy
  • 0 in reply to Andrew Durrant
    Guru 101615 points
    With SD24OSR=256 you can get 24-bit samples at 4ksps across all channels (1.024MHz/256).

    There's no external (timer-based) trigger mechanism, so you only get Continuous or One-shot (software triggered). Continuous is effectively fixed-rate, but you don't get to set the rate. By use of SD24PRE (perhaps in combination with throwing away samples) you can get some other effective rates, but getting the one you want may be difficult or impossible.

    At 5Hz, your best bet might be to self-time (start it in a Timer ISR) -- that's slow enough that the jitter probably won't be visible.
  • 0 in reply to Bruce McKenney
    Prodigy 20 points
    To clarify, I don't need 5Hz, just something "of that order", I was just trying to assertain if that was likely to be possible which this MSP.

    So for our application we can run the convertor continuously across all 4 channels, and I assume generate an interrupt at the end of conversion. That all sounds great, but is it really possible to get 4ksps total at a genuine 24 bit resolution? That sounds pretty darn quick for such a high resolution and a ADC integrated into a microcontroller?

    I'm not doubting you - but expressing some suprise, and concern I mis-understood!
  • 0 in reply to Andrew Durrant
    Guru 101615 points
    You will get that many bits that often. By saying "genuine", you're crossing over into quality, which is where those Data Sheet specs come in.

    My reading of the specs is that these ADCs are "pretty good", but not "super-duper". If you really need "super-duper" (as opposed to, say, better filters or shielding), TI has a collection of those (ADS1274 e.g.) -- for about 10x the price. And you still have to buy an MCU to drive it.

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