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ADS1248 accuracy and settling

Selva Kumar2
Prodigy 10 points
Other Parts Discussed in Thread: ADS1248

Hello Bob

                    I'm facing problem in ADS1248. I followed the Basic steps of Configuring ADS1248, but I'm getting +/-2 degree fluctuation. May i know how much Delay should i give for receiving ADC converted datas ??

          Actually I'm interfacing STM32F103RBT6 with ADS1248, using SPI. I have doubt in Delays.

Any suggestion is Welcome...

Regards

Selva 

  • 0
    TI__Guru* 92715 points

    Selva,


    Generally, once the device is configured and the /DRDY is indicated, the data should be settled and you should be able to read it. The only warnings that you need be aware of is while running at 2kSPS, there are limitations on the SCLK speed, as described on page 34 in the Single-Cycle Settling section.

    One helpful section of the datasheet is Table 16 on the datasheet. It describes the length of time required to get the first data conversion after a change in the settings. It outlines the number of milliseconds it takes to the data, depending on the data rate and the nature of the settling.

    If you are still having problems, I would consider that the ADC measurement isn't settled because of the circuitry connected to the ADS1248. If you have large capacitors or large series resistances, any changes you make will take time for the measurement to settle.

    If you are having a noise problem, there are plenty of other things that could be a problem.

    You should describe the problems that you have (either settling or noise) and what results you are getting. It helps to get the expected input value, reference voltage and the ADC output code. I'd also need to get a basic schematic on how you have it set up and what is powering your device.


    Joseph Wu