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XTR111 0-5V input to (4mA-20mA output or 0-10V output)

Almerindo Paiva
Intellectual 410 points
Other Parts Discussed in Thread: XTR111, XTR300

Hi,

I would like to ask if it is possible to convert a 0-5V DAC output  to 0-10V or 4mA-20mA, using the XTR111 without using any external amplifier.

I read the datasheet, there is a schematic that demonstrates how to get this output's, but, with a 0-10V signal applied to XTR111 Vin input.

I would like to ask, what is the maximum output swing voltage/current swing.

Best regards,

A. Paiva

  • 0
    TI__Guru 64125 points

    Hi A. Paiva,

    The circuit you reference in the datasheet uses the internal NMOS that drives the SET pin to create the voltage output.  This works because the NMOS source is a low-impedance node and the voltage on the SET pin is equal to the VIN voltage.  There is no way to get a voltage gain between VIN and SET because the negative feedback will force the two nodes of the amplifier to the same voltage. 

    To directly answer your question, the SET pin voltage is limited to 14V as listed in the abs. max ratings table in the datasheet.

    If you can't place an amplifier between the DAC and VIN node to achieve the voltage gain of 2 V/V, then you should consider using the XTR300 which is designed for both current and voltage outputs without any modifications.

  • 0 in reply to Collin Wells
    Intellectual 410 points

    Dear Mr. Collin,

    Yes, that's right. I would only know if this device would be able to do the job alone and if I could spare four amplifiers and some resistors.

    Thank you very much,

    Best regards,

    A. Paiva

  • 0 in reply to Almerindo Paiva
    TI__Guru 64125 points

    Mr. Paiva,

    Although XTR111 doesn't meet your needs I would still consider looking at the XTR300.  It is a very powerful device capable of a wide range of outputs (+/-10V, +/-20mA, 4-20mA, etc.) from a single 0 - 5V input.  The output can be switched from voltage to current outputs with the use of a single GPIO pin.