SN65HVD63: Coax Interface with Lightning Protection Circuit Design Recommendation and Difference between AISG 2.0 and 3.0

KevinZhang123

Part Number: SN65HVD63
Other Parts Discussed in Thread: SN65HVD62

Hi, Team

My telecom customer plan to use SN65HVD63 in their smart antenna products.

1. They need to add lightning protection circuit on TXOUT/RXIN trace of SN65HVD63. There are several compoenent on the circuit and the PCB trace width is much wider 4mm and 1mm. That will break the 50ohm trace characteristic impedance.

Is there any suggsetion on design the lightning protection circuit?

Here is customer scehmatic:

2. In AN65HVD63 datasheet, there is comparison table with SN65HVD62.

Is that all the difference between PHY of AISG2.0 and 3.0?

Is the MAXIMUM LEVEL in the table means the spurious level after the filter integrated in SN65HVD63?

Thanks

Kevin

over 7 years ago

0 Miguel Robertson over 7 years ago

TI__Guru 62920 points

Hi Kevin,

We are looking into this. For our understanding, though, is FEED1 the signal that connects to the coax line in this system?

Regards,
Max

0 KevinZhang123 over 7 years ago in reply to Miguel Robertson

TI__Expert 5750 points

Hi, Max

The Header 5 "X2" connects to the Coax line in this system.

Thanks
Kevin

0 Hao L over 7 years ago in reply to KevinZhang123

TI__Mastermind 25705 points

Kevin,

If you're really concerned about signal integrity, maybe you can consider Coaxial RF Surge Arrestors and RF ESD protection components.

PHY of AISG2.0 and AISG3.0 have very small difference. The major difference is more about the test.

Please let us know if you have more questions.

Regards,
Hao

0 KevinZhang123 over 7 years ago in reply to Hao L

TI__Expert 5750 points

Hi, Hao

What is the mean of "Spurious Freuency Range" and "Maximum Level" in datasheet? Is it only test method?

Thanks

Kevin

0 Hao L over 7 years ago in reply to KevinZhang123

TI__Mastermind 25705 points

Kevin,

Spurious frequency is the frequency at receiver end that may produce an interference with the modulation of the device. Maximum level means the max amplitude of the receiver. AISG 3.0 asks for better receiver selectivity, since the frequency range is tighter. But all these are achieved by test programs. Please let me know if you have more questions.

Regards,

Hao

Interface

Interface forum

SN65HVD63: Coax Interface with Lightning Protection Circuit Design Recommendation and Difference between AISG 2.0 and 3.0