TMUXHS4212: TMUXHS4212 Application AC Coupling Capacitors Placement Options

Chen Lucas

Part Number: TMUXHS4212

We want to use TMUXHS4212 for PCIe Gen4,

DATA SHEET description AC coupling have 3 types placement.

If use for PCIe Gen4, Which one placemetn recommand for PCIe Gen4?

0 Brian Zhou over 4 years ago

a type

0 Chen Lucas over 4 years ago in reply to Brian Zhou

Hi Brian,

Could let me know why are you recommand use Type-A placement?

Thanks.

0 Brian Zhou over 4 years ago in reply to Chen Lucas

Prefer Cap on connector side if common mode voltage large than 2v form the other side

0 Chen Lucas over 4 years ago in reply to Brian Zhou

Hi Brian,

My actual application have 2 host and 1 device so only one connector.

Do I still follow a type placement?

Block diagram below:

0 Brian Zhou over 4 years ago in reply to Chen Lucas

yes, on Tx lane close to connector

0 Chen Lucas over 4 years ago in reply to Brian Zhou

Hi Brian,

So Below block diagram red CAP loction is right?

0 Brian Zhou over 4 years ago in reply to Chen Lucas

no, AC cap should be on TX lane

0 Chen Lucas over 4 years ago in reply to Brian Zhou

Hi Brian,

So, I change CAP location RX to TX.

Let is right?

0 Brian Zhou over 4 years ago in reply to Chen Lucas

correct placement

Interface forum