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ADS 1278 queries

junaid ehsan
Prodigy 80 points
Other Parts Discussed in Thread: ADS1278

hey ,

i m going to use ADS 1278 for my final year project for measuring analog voltages and currents .... i am an amature at ADC's 

i need help ...

first of all i would like to know whats the difference between frame synchronous and SPI ,,, and which ones more preferabble when you have to be very accurate with your values ? 

  • 0
    TI__Guru**** 180751 points

    Hey Junaid!

    The ADS1278 has the ability to use an SPI interface; which is essentially a burst mode clocking scheme; or a McBSP (multi-channel buffered serial port) interface which uses a continuous clock.  The McBSP is common on most Texas Instruments TMS320 series processors.  Both SPI and McBSP are synchronous serial interfaces where a master device supplies the serial clock and the slave device (the ADS1278 in this case) responds with conversion data.

    The accuracy of the conversion results actually has nothing to do with either the SPI or McBSP mode of operation - either one should give you the same accuracy, its really a matter of the host processor that you are intending to use with the ADS1278.  Personally, I believe the McBSP interface is easier to deal with as it has options to directly accommodate a 24-bit data stream.  Most SPI peripherals can handle 8 to 16-bit data so you may have to do some additional data manipulation on the back end to accommodate the conversion data you'll receive from the ADS1278.

  • 0 in reply to Tom Hendrick
    Prodigy 80 points

    Thank you Tom :) 
     first of all i would like you to know that i am going to link this ADC with AVR micro controller (32-bit) at 66MHZ frequency.
    secondly can you please help me out with the difference between SPI and McBSP ? in rather much more simpler word :)
    and which one will give me higher speed for the aforementioned controller ? one more thing i need to ask is that in what way will get my ouput ... assuming i have given analong inputs to all the 8 channels , and for analog input1 i will receive my respective output at output pin1 serially ? 

    correct me if i have interpreted this wrong ; 
    you meant to say that to access the 24 bit output to my input McBSP is better ?  

    thank you so much for your earlier response .i need to ask a lot of question because this is my very first time with ADC's :) i will appreciate your response :)

  • 0 in reply to junaid ehsan
    Prodigy 80 points

    and one more thing that any notes or any link to study more about it will be very helpful :)