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THS2630: +/-12 V Single-Ended to +2.5 Vcm +/-2.5 V Differential ADC Driver Configuration

Chia Hung Lai
Prodigy 110 points
Part Number: THS2630

Hi TI team,

I am looking for a low-noise SE-to-Diff ADC driver to interface with the following parameter:

  • Input: +/-12 V span, single-ended
  • Output: +/-2.5 V differential across +2.5 V Vocm

The THS2630 seems the right choice, but the datasheet is lack of application example with gain < 1 for the resistor configuration, do advise.

Also, a SPICE model of the THS2630 would be really helpful. Thanks.

  • +1
    TI__Expert 6050 points

    Hi,

    From the details you provided, it seems that THS2630 is the right choice for your application. The datasheet provides an example of how to configure the amplifier in a single-ended to differential operation. In order to set the gain to be less than 1, Rg must be larger than Rf. So for your application, to get a 5V output swing, you can set Rf as 333 ohms and Rg as 800 ohms.

    I will attach the TINA schematic below for simulation purposes.

    THS2630_E2E.TSC

    Please let me know if you have any other questions.

    Thanks,

    Nick

  • 0 in reply to Nick Nauman
    Prodigy 110 points

    Hi Nick,

    Thanks, now I have something to begin with.

    Is TI able to provide SPICE model for this THS2630? Sorry that I am not a TINA user.

    Lai CH

  • +1 in reply to Chia Hung Lai
    TI__Expert 6050 points

    Hi Lai,

    You can create any SPICE model from the TINA model. If you open TINA and enter the amplifier macro, you can save the model as a CIR file. From there, you can open Pspice and select Tools -> Generate Part. This will bring up a dialog and you can load the CIR file. This will generate a symbol and the necessary files so that you can simulate the model in Pspice. 

    I have attached the CIR file for the THS2630 model below.

    THS2630.CIR

    Please let me know if you have any other questions about the part or circuit configuration or if you need any further help with creating the model in Pspice.

    Thanks,

    Nick

  • 0 in reply to Nick Nauman
    Prodigy 110 points

    Perfect, thanks!

  • 0 in reply to Chia Hung Lai
    TI__Expert 6050 points

    Hi Lai,

    Glad I could assist you with this. If you have any remaining questions about this topic feel free to reply to this thread. Or if you have questions about another topic, you can open a new thread.

    Thanks,

    Nick

  • 0
    Prodigy 30 points

    I am using the THS2630 as a driver for a diff EXCT Voltage of a sensor. In case of a short I would like to Power Down the device. What is your recommendation for this?

    David

  • 0 in reply to David Anoushirvany
    TI__Expert 6050 points

    Hi David,

    I am looking into this to provide the best recommendation for you. In the meantime, can you please provide some additional information on your application?

    Are you trying to protect from a short on the input or output of the THS2630?

    What is the amplitude of the differential voltage signal you are driving the sensor with?

    Are you able to provide a schematic showing the connection of the sensor and the amplifier?

    Thanks,

    Nick