155Mbps to 4.25Gbps SFF/SFP Laser Driver

with Extinction Ratio Control

_______________________________________________________________________________________

3

Note 1: AC characterization is performed using the circuit in Figure 2 using a PRBS 2

Note 2: Specifications at -40°C are guaranteed by design and characterization.

is high.

Note 5: The minimum required voltage at the OUT+ and OUT- pins is +0.75V.

Note 6: Guaranteed by design and characterization.

Note 7: Tested with 00001111 pattern at 2.7Gbps.

Note 8: DJ includes pulse-width distortion (PWD).

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

AUTOMATIC POWER AND EXTINCTION RATIO CONTROLS

Monitor-Diode Input Current

Range

Average current into the MD pin

18

1500

μA

MD Pin Voltage

1.4

V

MD Current Monitor Ratio

0.85

0.93

1.15

mA/mA

APC Loop Time Constant

3.3

μs

APC Setting Stability

(Note 6)

±100

±480

ppm/

°C

APC Setting Accuracy

±15

%

Range by Bias

K

K =

0

1.5

mA/mA

Range by Temperature

TC

TC =

0

1.0

mA/

°C

Threshold-Setting Range for

Temperature Compensation

(Note 6)

+10

+60

°C

LASER SAFETY AND CONTROL

Bias and Modulation Turn-Off

Delay

(Note 6)

5

μs

Bias and Modulation Turn-On

Delay

(Note 6)

600

μs

Threshold Voltage at Monitor

Figure 5

1.14

1.3

1.39

V

INTERFACE SIGNALS

TX_DISABLE Input High

2.0

V

TX_DISABLE Input Low

(typ)

0.8

V

15

TX_DISABLE Input Current

-70

-140

μA

TX_FAULT Output Low

Sinking 1mA, open collector

0.4

V

Shutdown Output High

Sourcing 100μA

V

Shutdown Output Low

Sinking 100μA

0.4

V

ELECTRICAL CHARACTERISTICS (continued)

otherwise noted.) (Notes 1, 2)