DS15BA101: DS15BA101

Hi Steven,
Looking at the DS15BA101 output when there is a failure, it seems the output gets muted(note there is a line in the middle of the eye diagram). Please ntoe the followings:
1). DS15EA101 IN+: I was expecting to see 49.9-ohm resistor to ground on C425 pin 1(please note figure 7 of the DS15BA101 www.ti.com/.../ds15ba101.pdf ). Do you have this in your schematic? With no 50-ohm termination, this could have high reflection which could be negatively affecting DS15BA101 operation.
2). I noted you are using 487-ohm Resistor on pin 4 of the DS15BA101. What happens if you increase this value to something like 953 ohm. Do you see the same problem again?
Please try check on #1 and #2 as noted above and let me know. Once we take care of #1 or we make sure you have a 50-ohm termination, there is one more thing we can try.
Regards,,nasser

Dear Sir,

Please refer below circuit

#1:  Yes! have put a 49.9ohm(R426) to GND

#2: I will try Rvo increase to 953ohm test again and update to you result.

Please you let me know if you have another suggestion.

Thanks!

Steven

Dear Nasser,

OK! I will try your recommend.

Rvo increase to 953ohm have improve connect condition but output voltage will reduce..(please refer attached test picture)

The customer was use RG58/U Coaxial Cable, have any cable length limit ?

Thanks for your kindly support.

Steven

Dear Sir,

My customer are use RG-58U 50ohm Coaxial cable, They would know Rvo=953ohm or 487ohm what is length of limit ?

As above test result, Rvo=953ohm have improve output voltage swing but waveform also reduce, so need they need to reduce cable length.

Thanks!

Steven