GS6080

Final Data Sheet

Rev.6

PDS-060045

September 2014

13 of 19

Proprietary & Confidential

www.semtech.com

This formula should be considered as a starting point, and actual swing values may vary

based on layout.

4.7 Output Return Loss Measurement

The GS6080 has a feature designed to facilitate reliable output return loss (ORL)

measurement while the device is still powered. The device can be put into a BALANCE

mode which prevents the outputs from toggling while the device is powered on,

allowing the ORL to be measured while the device is still powered.

When EQ_EN is LOW while SD_EN is HIGH, the device goes into BALANCE mode. This

mode is used during ORL measurement, disabling the AC signal path of the device

without powering it down. When in BALANCE mode, the device produces equal

pull-down currents in both differential shoulders of the serial data differential output,

effectively stopping the output at the output common mode voltage level. Semtech

recommends using BALANCE mode when measuring ORL with +2.5V termination

voltage.

1040

576

800

750

500

1210