Datasheet

ADN2871
Rev. A | Page 5 of 20
SFP TIMING SPECIFICATIONS
Table 2.
Parameter Symbol Min Typ Max Unit Conditions/Comments
ALS Assert Time t_off 1 5 μs
Time for the rising edge of ALS (Tx_DISABLE) to when
the bias current falls below 10% of nominal
ALS Negate Time
1
t_on 0.15 0.4 ms
Time for the falling edge of ALS to when the modulation
current rises above 90% of nominal
Time to Initialize, Including Reset of FAIL
1
t_init 25 275 ms From power-on or negation of FAIL using ALS
FAIL Assert Time t_fault 100 μs Time to fault to FAIL on
ALS to Reset Time t_reset 5 μs Time Tx_DISABLE must be held high to reset Tx_FAULT.
1
Guaranteed by design and characterization. Not production tested.
05228-003
DATAP
DATAN
DATAP–DATAN
V p-p
DIFF
= 2 × V
SE
V
SE
0V
Figure 4. Signal Level Definition
05228-004
0.1μF 0.1μF 10μF
1μH
3.3V
SFP HOST BOARD
SFP MODULE
V
CC
_Tx
Figure 5. Recommended SFP Supply