TLK10002 Specification Queries

Hello Max,

Below is the updates on the picture left out from my previous  email.

TLK10002 Receiver Specification Queries

1. How many dB of attenuated signal adaptive equalizer in the receiver side are able to equalize?

2. When HSRXAP/N has a differential input signal swing of <75 mVpp, LOSA will be asserted LVCMOS (Loss of Signal). At what frequency does 75mVpp refers to (1MHz)? Let me illustrate this questions with an example below:

Assuming the adaptive equalizer is able to equalize 20dB of signal losses, will the adaptive equalization able to equalize the signal at 5GHz (20mVpp) by 20dB with an input signal of 200mVpp at 1MHz. Will LOS be asserted (Loss of signal detected) if the signal is attenuated to 20mVpp at 5GHz?

Thank you

Sincerely

Jaz

Hi Jaz,

Thank you for the follow-up.

Regarding the EQ ability, the performance will depend on the loss profile of the interconnect.  The receiver is optimized to correct for a linear loss profile like you might find with a PCB trace or backplane.  To give a reference point, in our lab we've been able to establish a 10G link over 36 inches of FR-4 trace (8 mil width), which would have a loss of ~25 dB at the Nyquist frequency (5 GHz).

The LOS detection just looks at the total signaling level at the receiver.  If there is any frequency content with amplitude above the LOS threshold, the LOS signal will not be asserted.  It is designed to detect gross error conditions such as an unplugged cable.  So, in your example LOS would not be asserted.

Best regards,
Max Robertson
Analog Applications Engineer
Texas Instruments
m-robertson@ti.com

Just to clarify, the 36-inch link I mentioned before was established using a combination of receiver equalization and transmitter pre-emphasis, so the equalizer alone most likely would not be compensate for all of the loss.

Max