ADN2870 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADN2870

3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

Analog Devices 

ADN2870

SFP TIMING SPECIFICATIONS

Table 2.

Parameter

Symbol Min Typ

ALS Assert Time

t_off

1

ALS Negate Time1

t_on

0.83

Time to Initialize, Including t_init

25

Reset of FAIL1

FAIL Assert Time

t_fault

ALS to Reset time

t_reset

Max Unit Conditions/Comments

5

µs Time for the rising edge of ALS (TX_DISABLE) to when the bias

current falls below 10% of nominal.

0.95 ms Time for the falling edge of ALS to when the modulation current

rises above 90% of nominal.

275 ms From power-on or negation of FAIL using ALS.

100 µs

5

µs

Time to fault to FAIL on.

Time TX_DISABLE must be held high to reset TX_FAULT.

1 Guaranteed by design and characterization. Not production tested.

VSE

DATAP

DATAN

DATAP–DATAN

0V

V p-p DIFF = 2 × VSE

Figure 3. Signal Level Definition

SFP MODULE

VCC_Tx

1µH

0.1µF

0.1µF

3.3V

10µF

SFP HOST BOARD

Figure 4. Recommended SFP Supply

Rev. 0 | Page 5 of 20

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