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interfacing differential amplifiers connected in parallel with a high speed ADC as in parallel ADCs

ibrahim adama
Prodigy 50 points
Other Parts Discussed in Thread: ADC12D1800, LMH6552

hi,

please hope you wouldnt mind if i ask a stupid question? i have problem interfacing differential amplifiers with high speed ADCs i actually want to design a parallel analog to digital converter for high speed sampling, i hope i will get some help from you guys. hopefully waiting for your response. 

thank you

ibrahim

  • 0
    TI__Genius 17320 points

    Hi Ibrahim,

    What is the problem you're having? Are you trying to put multiple ADCs in parallel?

    Edit: I noticed that you've tagged the ADC12D1800. Are you trying to use it in interleaved mode or dual mode? What amplifier are you looking to use? Can you provide information about your system?

    Regards,
    Matt Guibord

  • 0 in reply to Matt Guibord
    Prodigy 50 points

    hi,

    thank you for the reply,  actually i am trying to use the ADC12D1800 in interleaved mode, the amplifiers i will want to use is the LMH6552, several amplifiers are to be connected in parallel with the ADC as in a parallel ADC. i am trying to design a time interleaving system for high speed sampling. 

    my regards

    ibrahim

  • 0 in reply to Matt Guibord
    Prodigy 50 points

    hi matt

    thank you for the reply,  actually i am trying to use the ADC12D1800 in interleaved mode, the amplifiers i will want to use is the LMH6552, several amplifiers are to be connected in parallel with the ADC as in a parallel ADC. i am trying to design a time interleaving system for high speed sampling.  still waiting for your reply.

    my regards

    ibrahim

  • 0 in reply to ibrahim adama
    TI__Genius 17320 points

    Ibrahim,

    I'm still not sure what your question is. You mention "time interleaving", so will each amplifier drive the input to a mux with the ADC connected to the output? See the block diagram below.

     

    Regards,
    Matt Guibord

  • 0 in reply to Matt Guibord
    Prodigy 50 points

    thank you matt,

    this is exactly what i am looking for  i will need more enlightenment on this as regards this time interleaving system. because my topic says design of a parallel analogue to digital converter for high speed sampling and timing error correction. please i will need clue how my circuit design should look like?

    i do really appreciate your effort

    regards

    ibrahim

  • 0 in reply to ibrahim adama
    TI__Genius 17320 points

    Ibrahim,

    I am not at all familiar with the design of a time interleaving system. Have you selected a mux yet? How fast does it need to switch?

    Likely you would drive the mux directly with the amplifier and perhaps use a filter after the MUX.

    Regards,
    Matt Guibord

  • 0 in reply to Matt Guibord
    Prodigy 50 points

    matt,

    thank you i appreciate your effort. i am still trying to create a design from the concept you helped me with

  • 0 in reply to ibrahim adama
    TI__Genius 17320 points

    Ibrahim,

    One last note. From a design/cost/size perspective, it is probably best to use a single amplifier after the MUX. Your sources will then directly drive the mux, or you could use a simple buffer before the mux if needed then the diff amp after. The interface between the amp and ADC should be simpler this way. Since there could be large changes in input voltage when the mux switches, you'll need good slew rate and settling times for the amplifier.

    Regards,
    Matt Guibord