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TI Home » TI E2E Community » Support Forums » Interface » High Speed Interface » High Speed Interface Forum » Can SN65LVDT100 be used with ground pin connecting to negative voltage?
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Can SN65LVDT100 be used with ground pin connecting to negative voltage?

Can SN65LVDT100 be used with ground pin connecting to negative voltage?

This question is answered
Bruce Jiang
Posted by Bruce Jiang
on May 31 2012 00:42 AM
Intellectual290 points

Hi.

In our application, we want to connect the ground pin of SN65LVDT100 to a negative voltage, such as -1V?

Is it working properly?

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  • Max Robertson
    Posted by Max Robertson
    on May 31 2012 11:21 AM
    Verified Answer
    Verified by Bruce Jiang
    Expert5975 points

    Hi Bruce,

    This is OK to do, but you need to make sure that you are operating within the recommended spec range for the device.  The datasheet's single-ended voltage specifications (such as the supply voltage, the input voltage at each pin, and the output common mode voltage) are defined with respect to the voltage at the device's ground pin.  If the device's ground is 1 V lower than your your system's ground, then all of these specs need to also be decreased by 1 V.

    For example, the recommended supply voltage (Vcc) range is 3.0 V to 3.6 V above the device's ground.  If the device's ground is at -1 V in your application, then the supply voltage range for you would be 2.0 V to 2.6 V.  Similarly, the input voltage (Vi) range is specified to be 0 V to 4 V above the device's ground.  This range would translate to -1 V to 3 V in your application.

    I hope this is clear.  Please let me know if you have any questions.

    Best regards,
    Max Robertson
    Analog Applications Engineer
    Texas Instruments
    m-robertson@ti.com

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