ADN2870 Analog Devices, Inc., ADN2870 Datasheet - Page 5

• Manufacturer Part Number: ADN2870
• Description: 3.3 V Dual-loop, 50 Mbps To 3.3 Gbps Laser Diode Driver
• Manufacturer: Analog Devices, Inc.

SFP TIMING SPECIFICATIONS
Table 2.
Parameter
ALS Assert Time
ALS Negate Time
Time to Initialize, Including
FAIL Assert Time
ALS to Reset time
1
Guaranteed by design and characterization. Not production tested.
Reset of FAIL
DATAP–DATAN
DATAN
DATAP
0V
1
1
Figure 3. Signal Level Definition
Symbol
t_off
t_on
t_init
t_fault
t_reset
V p-p
V
SE
DIFF
= 2
Min
×
V
SE
Typ
1
0.83
25
Max
5
0.95
275
100
5
Rev. 0 | Page 5 of 20
Unit
µs
ms
ms
µs
µs
Conditions/Comments
Time for the rising edge of ALS (TX_DISABLE) to when the bias
current falls below 10% of nominal.
Time for the falling edge of ALS to when the modulation current
rises above 90% of nominal.
From power-on or negation of FAIL using ALS.
Time to fault to FAIL on.
Time TX_DISABLE must be held high to reset TX_FAULT.
SFP MODULE
VCC_Tx
Figure 4. Recommended SFP Supply
SFP HOST BOARD
0.1µF
1µH
0.1µF
10µF
ADN2870
3.3V