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ADN2870 Datasheet(PDF) 5 Page - Analog Devices

Part No. ADN2870
Description  3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADN2870 Datasheet(HTML) 5 Page - Analog Devices

 
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ADN2870
Rev. 0 | 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 Time1
t_on
0.83
0.95
ms
Time for the falling edge of ALS to when the modulation current
rises above 90% of nominal.
Time to Initialize, Including
Reset of FAIL1
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.
DATAP
DATAN
DATAP–DATAN
V p-p DIFF = 2 × VSE
VSE
0V
Figure 3. Signal Level Definition
0.1
µF
0.1
µF
10
µF
1
µH
3.3V
SFP HOST BOARD
SFP MODULE
VCC_Tx
Figure 4. Recommended SFP Supply


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