SSM2142 Balanced Line Driver breaking input impedance

Hi Dave,

The LVDT transducers is typically a “step-down transformers”…in my application excite the primary with a max differential sine wave of 20Vpp@5kHz and the maximum  LVDT sine wave response is maximum 3Vpp@5kHz (as a function of “the core” material and position of the inserted in the LVDT).

About the maximum input voltage range of SSM2142 balanced line driver, Does the Vin =+-7.071V is the maximum input voltage that provide the clip level output voltage of 10.5Vrms? Is it correct? Does the maximum input voltage equal to the power supply of SSM2142?

The failure is permanent. The devices no longer works after a power-off\power-on of the power supply.

About the input impedance of SSM2142, I’ve measured the “static” impedance with the board without power supply applied with a digital multi-meter in ohm configuration. Probably the input impedance of 10k typical provided in the datasheet refer to a “dynamic” impedance providing the power supply to the device.  The “static” impedance measurement in my application is useful to detect static failure in the board as short\open condition.

Do you have others suggestion on what’s could be the “root” cause of this failure?

Do you have a failure analysis of SSM2142?

Thanks for the support.

Best Regards.

Francesco C.

Hi Dave,

The LVDT transducers is typically a “step-down transformers”…in my application excite the primary with a max differential sine wave of 20Vpp@5kHz and the maximum  LVDT sine wave response is maximum 3Vpp@5kHz (as a function of “the core” material and position of the inserted in the LVDT).

About the maximum input voltage range of SSM2142 balanced line driver, Does the Vin =+-7.071V is the maximum input voltage that provide the clip level output voltage of 10.5Vrms? Is it correct? Does the maximum input voltage equal to the power supply of SSM2142?

The failure is permanent. The devices no longer works after a power-off\power-on of the power supply.

About the input impedance of SSM2142, I’ve measured the “static” impedance with the board without power supply applied with a digital multi-meter in ohm configuration. Probably the input impedance of 10k typical provided in the datasheet refer to a “dynamic” impedance providing the power supply to the device.  The “static” impedance measurement in my application is useful to detect static failure in the board as short\open condition.

Do you have others suggestion on what’s could be the “root” cause of this failure?

Do you have a failure analysis of SSM2142?

Thanks for the support.

Best Regards.

Francesco C.