ONET1130EC Datasheet, PDF (54/60 Pages) Texas Instruments – 11.7 Gbps Transceiver with Dual CDRs and Modulator Driver

ONET1130EC
SLLSEJ3A – JUNE 2015 – REVISED JULY 2015
11 Layout
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11.1 Layout Guidelines
For optimum performance, use 50-Ω transmission lines (100-Ω differential) for connecting the high speed inputs
and outputs. The length of transmission lines should be kept as short as possible to reduce loss and pattern-
dependent jitter. It is recommended to maximize the separation of the TXOUT+ and TXOUT- transmission lines
from the RXIN+ and RXIN- transmission lines to minimize transmitter to receiver crosstalk.
If the single-ended mode of operation is being used (TXMODE = 1) then it is recommended to terminate the
unused output with a 50-Ω resistor to VCC. Figure 73 shows a typical layout for the high speed inputs and
outputs.
11.2 Layout Example
From
Host
TXIN+
TXIN-
TXOUT-
50Oto VCC
Termination
AC-coupling
capacitors
RXIN-
RXIN+
From
ROSA
Bias-T
Ferrites
54
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Figure 73. Board Layout
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