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PGA 308 alternate, sensor signal conditioning

Sudheer Beligere
Intellectual 270 points
Other Parts Discussed in Thread: PGA308

I have been using PGA 308 for few of my projects for sensor signal conditioning but was wondering is this the low cost solution that TI offer for sensor signal conditioning. is there any alternate that I can think off! i am using most of the functionality of PGA308 especially digital programming. Can anyone explored much lower cost solution that this?

 

Thanks and regards,

Sudheer

  • 0
    TI__Guru 62055 points

    Hi Sudheer,

    The PGA308 is the lowest cost integrated analog sensor conditioning circuit of its type that TI offers. While comparable systems could be accomplished with discrete components, It will likely not be possible to replicate the performance of the PGA308 with a comparable solution cost.  A similar system could likely be accomplished with one of the MSP430 products with integrated ADCs + DACs + Op Amps, however I'm not sure of the performance and cost of that type of solution.  Consider looking through some of the options at: www.MSP430.com

  • 0 in reply to Collin Wells
    TI__Mastermind 27715 points

    Hello Sudheer,

    I second Collin's statement.

    The PGA308 is an integrated solution which contains multiple devices (MUX, PGIA, DACs, OTP, RAM), and as such it would be more expensive and much more complex to implement using discrete components (most likely with worse performance). I recommend that you continue to use the PGA308 for your sensor signal conditioning applications.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps

  • 0 in reply to Ian Williams
    Intellectual 270 points

    Hello Ian, Collin,

    Thanks for the response, i am aware of all the capabilites of PGA 308 and it's my first choice for most of my designs as it offers comprehensive solution that a sensor siganl conditioner does. I have a new requirement with less need on accuracy and resolution but a low cost solution hence was exploring alternate option. Going with completely discrete solution will add process cost at production hence digitaly calibration options is the preferred design architecture. I did explore Micro + ADC+ DAC solution but close match i could found was with 8 bit DAC (not MSP 430 as it doesn;t work at 5 V). i even explored progrramble potentiometer options with TI but the solution still can't match PGA 308 cost . But I could found one more solution with low cost sensor signal conditioner which also offers inbuilt regulator (one external mosfet) currently exploring that now.

    One input in case you are planning to revisit PGA308, include this regulator circuitry inside that helps save us few cents in design.

    Thanks again for your quick inputs

    thanks and regards,

    Sudheer