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PGA900: PGA900 questions

Mickey Zhang
Genius 12080 points
Part Number: PGA900
Other Parts Discussed in Thread: PGA300

Hi team,

The customer would like to use PGA900 to deal with a dynamic pressure signal. The frequency of the pressure signal is 10KHZ.

He would like to deal with the temperature nonlinearity compensation.

Q1: If the customer uses PGA900  to deal with the temperature nonlinearity compensation, can PGA900 meet his requirement?

How much frequency  of the pressure signal  can PGA900 deal with?

Q2: As I know, The PGA900EVM needs to use XDS200 with CCS to program. But when he uses PGA900 in his board,

does he still need to use XDS200 with CCS to program?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

  • 0
    TI__Genius 12080 points
    Hi team,

    Would you help me to verify the above information? The customer is waiting for my reply.
  • 0 in reply to Mickey Zhang
    TI__Mastermind 31655 points
    Hi Mickey,

    The output sample rate of the pressure ADC can be set to either 7.8kHz, or 15.6kHz, and this is what limits the frequency of the pressure signal. You will need an output rate that is at least 2x the input frequency. At the 15.6kHz rate, that means that the input signal is limited to 7.8kHz, so 10kHz will be too high.

    The XDS200 is only needed for the quick debugging. The PGA900 can be programmed through any of the other communication options (OWI, SPI, etc.).

    Regards,
  • 0 in reply to Scott Cummins
    TI__Genius 12080 points
    Hi SCott,

    Thanks for your reply. If the frequency for the customer's pressure sensor is 10KHZ, can PGA300 meet his requirement?
    If it not, do we have any other device that can meet the customer's requirement? Or the solution?
  • 0 in reply to Mickey Zhang
    TI__Mastermind 31655 points

    Hi Mickey,

    Unfortunately this is just a limitation of the ADC in the device. None of TI's pressure sensing devices have a fast enough ADC to handle this frequency. Please feel free to try with the PGA900, but just know that it will not be able to output 2 samples per period to allow for proper reconstruction of the signal at 10khz.


    Regards,