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ADS1217+ADS1217EVM

Vladimir Leizerovich
Prodigy 20 points
Other Parts Discussed in Thread: ADS1217, ADS1248, ADS1248EVM-PDK, ADS1246, ADS1247, ADCPRO

Good day to you all,

I need a A to D convertor that could read +-5 V dc and transfer the data to a computer in a way that this data could be used for programing in a C# environment.

after going over the needed parameters with out tech stuff the ADS1217 was chosen to do the job.

As I could understand I would also need ADS1217EVM in order to easily connect to a computer.

My questions are:

1. I couldn't find ADS1217EVM in the "buy" part of the site and the only manual for it is from 2002 and talks about windows 95

is this unit steel functional or is there something else instead?

2. Will this unit actually supply me the data and in what format? (csv,txt,...).

Thank you for your time.

  • 0
    TI__Guru** 113765 points

    Hi Vladimir,

    The ADS1217EVM was made obsolete some time ago, but we have kept the user's guide link active for those that may have purchased the board in the past.  This board is no longer available due to software/hardware limitations using current operating systems.

    Generally speaking, our EVMs are meant for evaluating part performance and are not designed as an end solution.  A processor is required for devices such as the ADS1217.  The ADS1217 outputs data in a SPI compatible format, which requires a minimum of 3 signals.  This is serial data that is retrieved in byte increments.  You cannot directly connect the part to PC.  You would need to convert the data and transfer it via some other form of communication such as ascii on a COM port or by USB.

    If you can tell me some more details on what you are trying to do as well as your expertise working with hardware/software, I can give you some ideas on what to do to build your own system.  There are also systems you can buy that are low cost data acquisition systems.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 20 points
    Good day Bob,

    I am building an LVDT measuring system, I have an LVDT device and a Schaevitz reading device that gives me +-5V output which I would need to translate in to physical units as [mm].

    I need an A to D converter that would translate the analog reading from LVDT reader in to digital data on a computer that could be worked with.
  • 0 in reply to Vladimir Leizerovich
    TI__Guru** 113765 points

    Hi Vladimir,

    Most of our precision ADCs use unipolar supplies.  This will limit the range of the input to 0 to 5V assuming a 5V supply.  The +/-5V full-scale range of the ADS1217 does not mean you can measure a voltage below ground.  The differential measurement is with respect to one input relative to the other in terms of voltage.  This means that the pin assigned to AINP is measured against the pin assigned to AINN.  If AINP has 5V and AINN is at ground, the output will be +5V in terms of the data result.  If AINP is at ground and AINN is 5V, then the result is -5V in terms of codes.  To use this type of device would require a reduction of the input voltage to within the range of the ADC with an additional device such as an INA.

    We also have devices that power from bipolar supplies, such as the ADS1248.  This will allow measurements with inputs up to within 100mV of the supplies.  This would require a minimum of a resistor voltage divider to reduce the voltage from the sensor from +/-5V to +/-2.4V maximum (when using a reference voltage of the ADC of 2.5V). The reference of the ADS1248 is 2.048V, which if used, would require the voltage divider to divide the +/-5V to +/- 2.048V.

    The ADS1248EVM-PDK allows for up to 7 measurement channels single ended when using the option for bipolar supply operation.  The ADS1247 (3 measurement channels single ended) and ADS1246 (1 single ended measurement) are similar devices with EVMs that have the bipoiar supply option.

    If you order the ADS1248(7 or 6)EVM-PDK the EVM connects to a PC using a virtual COM port with USB.  The data can be viewed using ADCPro or through a COM terminal as ASCII representing hex values.

    Best regards,
    Bob B