GS6080 Datasheet, PDF (10/19 Pages) Semtech Corporation – Input signal trace equalization

4. Detailed Description
4.1 Serial Data Input
The GS6080 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 6.25Gb/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 GS6080 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 GS6080 features a current-mode differential output driver capable of driving up to
1040mV_pp single-ended into a 1m length of 75Ω cable terminated at both ends.
The output signal amplitude is set using an external R_SET resistor.
The SDO/SDO pin of the device provide the serial data outputs.
GS6080
Final Data Sheet
PDS-060045
Rev.6
September 2014
www.semtech.com
10 of 19
Proprietary & Confidential