Datasheet

MAX3982
SFP Copper-Cable Preemphasis Driver
4 _______________________________________________________________________________________
Figure 1. Illustration of Tx Preemphasis in dB
Figure 2. Test Setup. The points labeled A, B, and D are referenced for AC parameter test conditions. Deterministic jitter and eye
diagrams measured at point D.
V
LOW_PP
V
HIGH_PP
PE dB
V
V
HIGH PP
LOW PP
( ) log
_
_
=
⎛
⎝
⎜
⎜
⎞
⎠
⎟
⎟
⎡
⎣
⎢
⎢
⎤
⎦
⎥
⎥
20
SIGNAL
SOURCE
1in ≤ L ≤ 10in
IN OUT
6 mil
6 mil
L = 2in
PCBOARD (FR4)
6 mil
L ≤ 1in
A
D
OSCILLOSCOPE OR
ERROR DETECTOR
B
SMA CONNECTORS
24AWG 100Ω TWIN-AX
TEST SETUP
SMA CONNECTORS
FR4
4.0 ≤ ε
R
≤ 4.4
tan δ = 0.022
MAX3982