ADN2870(RevA) Просмотр технического описания (PDF) - Analog Devices

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ADN2870
(Rev.:RevA)

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 Max Unit Conditions/Comments

ALS Assert Time

t_OFF

1 5 μs Time from 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 from 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 Time from power-on or negation of FAIL using ALS.

FAIL Assert Time

t_FAULT

100 μs Time from fault to FAIL on.

ALS to Reset Time

t_RESET

5 μs 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. A | Page 5 of 20

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