2.7Gbps, Low-Power SFP Laser Drivers

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3

ELECTRICAL CHARACTERISTICS (continued)

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

AUTOMATIC POWER-CONTROL LOOP

MD Reverse Bias Voltage

18µA

1.6

V

MD Average Current Range

Average current into MD pin

18

1500

µA

(MAX3735)

-880

+880

(MAX3735A)

-110

+110

Average Power-Setting Stability

APC closed loop

(Notes 4, 7)

-650

+650

ppm/°C

Average Power Setting Accuracy

APC Closed Loop

1mA

-16

+16

%

MAX3735

0.8

1

1.23

External resistor to GND

defines the voltage gain;

50k

Ω

MAX3735A

0.9

1.1

MD-Current Monitor Gain

Ω

0.95

1

1.05

A/A

MAX3735

-10

+10

MD-Current Monitor Gain Stability

18µA

(Notes 4, 6)

MAX3735A

-4

+4

%

LASER MODULATOR

≥ 0.6V (DC-coupled)

10

60

Modulation On-Current Range

≥ 2.0V (AC-coupled)

10

85

mA

Modulation Off-Current

Current into OUT+ pin during TX_FAULT or

TX_DISABLE

100

µA

-480

+480

Modulation-Current Stability

(Note 4)

-255

+255

ppm/°C

Modulation-Current Absolute

Accuracy

10mA

-15

+15

%

Modulation-Current Rise Time

20% to 80%, 10mA

42

65

ps

Modulation-Current Fall Time

20% to 80%, 10mA

50

80

ps

10mA

(Notes 4, 9, 10)

18

38

At 1.25Gbps (K28.5 pattern)

11.5

At 622Mbps (Note 9)

18

Deterministic Jitter

At 155Mbps (Note 9)

40

ps

Random Jitter

RJ

10mA

0.7

1.0