ONET1191P: ONET1191P OFFSET

Anita Richardson

Part Number: ONET1191P

Hi,

I am using the ONET1191P and I have seem to the encounter the same issue where I get an offset input voltage of ~ 1.7 V. Schematic is shown below.

Even when I do not put any signal in, I get a 1.7 V offset on the input and at 2.9 V output on both Dout +/-. Is the chip damaged or is there something wrong with my design?

Thanks,

Anita

over 3 years ago

0 Nasser Mohammadi over 3 years ago

TI__Guru* 93670 points

Hi Anita,

When this occurs, what is the state of LOS pin?

Regards,,Nasser

0 Anita Richardson over 3 years ago in reply to Nasser Mohammadi

Prodigy 10 points

The LOS pin is high (3.3V) when there is no input and ~0.1V when there is an input signal of 1 Gbps. There is still an offset on the input and output with the offset filter in place.

0 Nasser Mohammadi over 3 years ago in reply to Anita Richardson

TI__Guru* 93670 points

Hi Anita,

When there is not signal - LOS is high - output is muted and both Dout+/- are pulled to2.9V. This is expected. Device is not damaged and there is nothing wrong with your design - of course as long as high speed data operation looks good.

Regards,,Nasser

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ONET1191P: ONET1191P OFFSET