GS6081 Datasheet, PDF (10/19 Pages) Semtech Corporation – Input signal trace equalizationnull

4. Detailed Description
4.1 Serial Data Input
The GS6081 features a differential input buffer with on-chip 100Ω differential
termination.
The serial data input signal is connected to the DDI and DDI input pins of the device.
Input signals can be single-ended or differential, DC or AC-coupled.
The serial data input buffer is capable of operation with any binary coded signal that
meets the input signal level requirements, in the range of 270Mb/s to 5.94Gb/s.
The input circuit is self-biasing to allow for simple AC or DC-coupling of input signals to
the device.
4.2 Input Trace-equalization
The GS6081 features fixed trace-equalization to compensate for PCB trace dielectric
losses.
Note: This feature is not available in SD mode, and therefore trace-equalization must be
disabled when operating in this mode.
The trace-equalization has two settings, OFF and ON. ON invokes a typical 3dB gain
value at 1.5GHz.
Table 4-1: Input Trace-Equalization
EQ_EN
0
1
Floating
Function
Typical 3dB Trace Equalization
Trace Equalization OFF
Trace Equalization OFF
4.3 Serial Data Output
The GS6081 features dual current-mode differential output drivers capable of driving up
to 1040mV_pp single-ended into a 1m length of 75Ω cable terminated at both ends.
The output signal amplitude or is set using an external R_SET resistor.
The SDO1/SDO1 and SDO2/SDO2 pins of the device provide the serial data outputs.
GS6081
Final Data Sheet
PDS-060046
Rev.4
July 2014
www.semtech.com
10 of 19
Proprietary & Confidential