Datasheet

MAX3982
SFP Copper-Cable Preemphasis Driver
8 _______________________________________________________________________________________
15m 24AWG CABLE ASSEMBLY
OUTPUT WITHOUT MAX3982,
4.25Gbps PRBS31
MAX3982 toc17
15m 24AWG CABLE ASSEMBLY
OUTPUT WITH MAX3982
PREEMPHASIS, 4.25Gbps PRBS31
MAX3982 toc18
PREEMPHASIS, PE[1,0] = 11, OUTLEV = HIGH
40mV/div
HOT-PLUG WITH TX_DISABLE LOW
MAX3982 toc19
10ms/div
TX_DISABLE
V
CC
OUT+
3.3V
0V
LOW
t
POR
= 27ms
30in FR4 OUTPUT
WITHOUT MAX3982,
4.25Gbps CJTPAT
MAX3982 toc20
30in FR4 OUTPUT
WITH MAX3982 PREEMPHASIS,
4.25Gbps CJTPAT
MAX3982 toc21
PREEMPHASIS, PE[1,0] = 10,
OUTLEV = HIGH
100mV/div
DETERMINISTIC JITTER
vs. FR4 LENGTH
MAX3982 toc22
FR4 LENGTH (in)
DETERMINISTIC JITTER (UI)
40302010
0.2
0.4
0.6
0.8
1.0
1.2
0
050
4.25Gbps PRBS7
DRIVING FR4 AT OUT+ AND
OUT-, NO FR4 AT INPUT
PE[1,0] = 01
PE[1,0] = 10
PE[1,0] = 11
PE[1,0] = 00
Typical Operating Characteristics (continued)
(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.)