DS80EP100_15 Datasheet, PDF (6/18 Pages) Texas Instruments – 5 to 12.5 Gbps, Power-Saver Equalizer for Backplanes and Cables

DS80EP100
SNLS279C – JULY 2007 – REVISED FEBRUARY 2013
APPLICATION INFORMATION
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DS80EP100 DEVICE DESCRIPTION
The DS80EP100 Power-Saver equalizer is a passive network circuit composed of resistive, capacitive, and
inductive components (See Figure 5). A Differential bridged T-network compensates for the transmission medium
losses and minimizes medium-induced deterministic jitter with FR4 and cables. The equalizer attenuates low
frequency signals and is a bandpass filter at the resonant frequency. The response is linear and symmetric.
I/O TERMINATIONS
The DS80EP100 I/O impedance is 100Ω differential. The equalizer is designed for 100Ω-balanced differential
signals and is not intended for single-ended transmission.
LINEAR COMPENSATION
The unique linear compensation feature of the DS80EP100 combined with the tiny package allows maximum
flexibility in placement. The equalizer can be placed anywhere in the data path and will provide the same
compensation at the receiving circuit. (See Simplified Application Diagram)
SYMMETRIC I/O STRUCTURES
The symmetry of the passive equalization network allows bi-directional operation. Signals receive equal
compensation regardless of the direction of data flow. (See Figure 5).
PCB LAYOUT CONSIDERATIONS FOR DIFFERENTIAL PAIRS AND NO CONNECT PADS
The differential I/Os must have a controlled differential impedance of 100Ω. It is preferable to route all differential
lines exclusively on one layer of the board. The use of vias should be avoided if possible. If vias must be used,
they should be used sparingly and must be placed symmetrically for each side of a given differential pair.
Differential signals should be routed away from other signals and noise sources on the printed circuit board. Pin
2, Pin 5, and the center DAP have to be left as no connect. Therefore, do not connect the landing pads of these
pins to the power or ground plane. See AN-1187 for additional information on the WSON package.
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