Datasheet

MAX3982
SFP Copper-Cable Preemphasis Driver
_______________________________________________________________________________________ 5
Figure 3. End-to-End Test Setup Using the MAX3748 as a Receiver. Deterministic jitter and eye diagrams measured at point D.
SIGNAL
SOURCE
1in ≤ L ≤ 12in
L ≤ 1in
IN OUT
6 mil
6 mil
L = 2in
L ≤ 1in
PC BOARD (FR4)
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
6 mil
22pF
22pF
39Ω
39Ω
OUT IN
MAX3748
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 2
7
, 100 zeros, 1010, PRBS 2
7
, 100 ones, 0101.)
TRANSIENT RESPONSE
MAX3982 toc01
A = 2dB, PE = 00
B = 4dB, PE = 01
C = 8dB, PE = 10
D = 14dB, PE = 11
4.25Gbps K28.7 PATTERN
OUTLEV = HIGH
A
B
C
D
D
C
B
A
END-TO-END DETERMINISTIC JITTER
vs. CABLE LENGTH AT 4.25Gbps
MAX3982 toc02
CABLE LENGTH (m)
DETERMINISTIC JITTER (UI)
15105
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
020
4.25Gbps PRBS7 + 100CID
PE[1,0] = 00
PE[1,0] = 01
PE[1,0] = 10
PE[1,0] = 11
12in FR4 AT INPUT
USING MAX3748 AS
RECEIVER, AS SHOWN
IN FIGURE 3
END-TO-END DETERMINISTIC JITTER
vs. CABLE LENGTH AT 2.125Gbps
MAX3982 toc03
CABLE LENGTH (m)
DETERMINISTIC JITTER (UI)
15105
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
020
2.125Gbps PRBS7 + 100CID
PE[1,0] = 01
PE[1,0] = 10
PE[1,0] = 11
12in FR4 AT INPUT
USING MAX3748 AS RECEIVER,
AS SHOWN IN FIGURE 3
PE[1,0] = 00