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ADC selection

chaitanyab
Intellectual 620 points
Other Parts Discussed in Thread: ADS1259, PGA280

Hi,

I need to measure output of vibration sensors.These are all bridge type outputs.They operate from 8-32 V range excitation.So my common mode is always 4-16V.

I need to find an 16 bit ADC and 4 channel MUX and an Amplifier.

Sensor outputs are in the range of 10 - 600 mV. max.,frequency 1 to 128 Hz.

Does any one knows any part numbers suitable?

 

 

  • 0
    TI__Guru* 79234 points

    Hello,

    Since this is a sensor application, I believe it is best for the Precision Analog team to answer this question. I will move this post to the appropriate forum.

    -KH

  • 0 in reply to Kang Hsia
    TI__Guru**** 181641 points

    Thank's Kang -

    Hi chaitanyab,

    We'll look through our portfolio of data converters and see what we have that might help you out here.

  • 0 in reply to Tom Hendrick
    TI__Guru 55466 points

    Hi Chaitanyab,

    A possible solution is to use the PGA280 + ADS1259 + External Mux.

    The input stage of the PGA280 allows you to use +/-18V supply or VSP-VSN = 36V; enough range to accomodate the common-mode voltage requirement.  The output stage of the PGA280 is biased with the output stage supplies VSON=0V and VSOP=5V to be able connect the device to the ADS1259.   

    The ADS1259 datasheet shows an application for the ADS1259+PGA280 on page 41, figure 64.    

    The PGA280 has a built-in two input mux at the front end; however you could use the device's GPIO's to connect an external Mux in order to be able to measure your four bridge sensors; as shown on the block diagram on page 1 of the PGA280 datasheet.  Let me know if you think this will work for you.

    Thank you and Regards,

    Luis