SN65LVDT41: Protection against conducted susceptibility CS114 and CS115

Thien Huynh

Part Number: SN65LVDT41

I use the SN65LVDT41 in my design to report status to the customer. I also use the receiver to inputs to receive a command from the customer. I want to ask if there's any recommendation for protecting the device against MIL-STD 461F CS114 and CS115 bulk cable injection?

I notice that the equivalent circuit stated in the datasheet has some diode on the output but I assume there is no actual diode inside the IC. Should I put some 5-6V Zener from each differential pair to ground? One thing to note is there is no ground wire between my device and the customer, only the differential pairs get connected.

Best

Thien Nhien Huynh

over 3 years ago

0 Ikechukwu Anyiam over 3 years ago

TI__Mastermind 35130 points

Hi Thien,

The LVDS nature of this device inherently provides some protection from radiated emissions. However, the part was never subjected to MIL-STD-461 so we don't have any specific recommendations for it, only general recommendations like adding common mode chokes to further inhibit EMI and ensuring good PCB layout design.

Regards,

I.K.

0 Thien Huynh over 3 years ago in reply to Ikechukwu Anyiam

Prodigy 60 points

Hi I.K,

Base on the equivalent circuit, Is it safe to assume pin A, B, Y, and Z will clamp to 7V when there's a voltage transient? Or do I need to put actual TVS on there?

Thien Nhien Huynh

0 Ikechukwu Anyiam over 3 years ago in reply to Thien Huynh

TI__Mastermind 35130 points

Hi Thien,

Sorry for the delay, let me check with my team on this to make sure. I'll provide an answer by tomorrow.

Regards,

I.K.

0 Ikechukwu Anyiam over 3 years ago in reply to Thien Huynh

TI__Mastermind 35130 points

Hi Thien,

Your assumption is correct - based on the equivalent circuits the Zener diodes should clamp the voltages to 7V when there's a transient.

Regards,

I.K.

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SN65LVDT41: Protection against conducted susceptibility CS114 and CS115