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ADS1298RECGFE-PDK Not Installed Components

sravan jaini
Intellectual 355 points
Other Parts Discussed in Thread: ADS1298RECGFE-PDK, ADS1298R, REF5025, REF5040, ADS1298

Hi Tom,

I have one more doubt regarding NI(not installed components),what i have to do.In Bom also there are no details of not installed components.

Please help me.

Thanks,

Sravan.

  • 0
    Intellectual 355 points

    Hi Tom,

    I am in great hurry,please help me.Opamps like U13A,U13B,ics likeU3,U4 and diodes like D1-D10 are not installed components,I would like to know the names and foot prints of the same.Please help me.Is these are compulsory to be placed?

    Thanks,

    Sravan.

  • 0 in reply to sravan jaini
    TI__Guru**** 170985 points

    Sravan,

    The ADS1298RECGFE-PDK does have several components which are shown as Not Installed.  As these parts are not necessary to run the board, it is not compulsory to place them onto your own hardware setup. 

    Since you asked though, U13 is a standard 8-pin SOIC- our 'D' package.  We've not identified any specific amplifier for use in that location so I don't have any details on a particular part number. 

    U3 and U4 are options for an external 2.500V or 4.096V reference.  Since the ADS1298R has a internal reference sources, these two components are not installed on the board and are therefore are not compulsory for placement in your own hardware.  These components are also the standard 8-pin SOIC footprint.  If you feel the internal reference of the ADS1298R will not be adequate for your system requirements, you could use either the REF5025 or REF5040 - you would not need both unless you plan to have an option in your end system to allow the selection of the reference source.

    Diodes D1 thru D10 are SOT23-3 footprints, this would be our DBZ package.  These could be nearly any dual ESD diode or perhaps a dual zener - the implementation of these diodes is not mandatory from the perspective of the ADS1298R, but safety considerations based on local and international specifications for medical products may dictate how you configure the front end of your system. 

  • 0 in reply to Tom Hendrick
    Intellectual 355 points

    Hello Tom,

    Thank you very much for your kind co-operation.I want to be in contact with you all the time.

     

    Thanks,

    Sravan.

  • 0 in reply to Tom Hendrick
    Intellectual 355 points

    Hello Tom,

    I would like to know some issues regarding ads1298.I am going to use ag/agcl electrodes to acquire ecg signal from the patient.As ecg signals are lower in potential around 1mv-5mv,there are jumpers before the ads1298 ic on board,will there be any voltage drop in jumper if it is,how much it will be?Is my approach is correct?Please do a favor in this regard?

     

    Thanks,

    Sravan.

  • 0 in reply to sravan jaini
    TI__Guru**** 170985 points

    Hi Sravan,

    There should not be any voltage drop across the jumper.  For EEG, the most common approach that I am aware of is to feed the signals in differentially.  You may need additional gain as well, the ADS1298 by itself can monitor intracranial EEG signals without an additional gain stage.