LMH1219: Acceptance criteria for HEO and VEO values

Hi Team,

Can you please help us with our customer's inquiry below.

I’m currently using the LMH1218 and LMH1219 devices in an SDI video system, with both devices being controlled via SPI from an FPGA.

As part of our system development, I’ve implemented a tool that configures the equalizer and cable driver devices, reads the Eye Opening Monitor (EOM) data along with the visual representation of the eye diagram and reads the values of Horizontal Eye Opening (HEO) and Vertical Eye Opening (VEO). The following figure shows the measurements for the LMH1219 using a 4kp60 input video signal. These measurements are performed with equalization enabled, so the diagram and values relate to equalized SDI signal.

I would now like to begin the validation process of this tool. I found this TI slide that provides acceptance criteria for the HEO and VEO values (i.e. HEO > 45 % and VEO > 150 mvp-p)

/cfs-file/__key/communityserver-discussions-components-files/138/Eye-Opening-Monitor-Description.pdf

As shown in the image above, I set these values ​​and based on the calculation I made for the HEO parameter the test report would fail in this case. 

Can these acceptance thresholds for HEO and VEO be considered reliable when using the LMH1219 and LMH1218? If so, should the calculated HEO and VEO values be taken after equalization, or should the measurement be performed with the equalizer disabled in order to evaluate the received SDI input signal? 

Regards,

Danilo