2.5Gbps Laser Driver with Automatic

Modulation Control

6

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Pin Description

PIN

NAME

FUNCTION

1, 8, 19,

22, 28

Positive Supply Voltage

2

DATA-

Complementary Data Input, with On-Chip Termination

3

DATA+

Data Input, with On-Chip Termination

Termination Reference Voltage for Data Inputs

Termination Reference Voltage for Clock Inputs

6

CLK+

Clock Input for Data Retiming, with On-Chip Termination

7

CLK-

Complementary Clock Input for Data Retiming, with On-Chip Termination

9, 16, 23,

24, 25

GND

No Internal Connection. Tie to ground.

10

RTEN

Data Retiming Enable Input, TTL Compatible, Active-High

11

EN0

Operating Mode Input, TTL Compatible

12

EN1

Operating Mode Input, TTL Compatible

13

FAIL

Fault Warning, TTL Compatible. Low for fault condition.

14

BIASMON

15

MODMON

17

BIAS_X

Bias Shunt. Always tie to the BIAS pin.

18

BIAS

Laser Bias-Current Output. Connect to the laser via an inductor.

20

MODN

Modulation-Current Output to Dummy Load

21

MODQ

Modulation-Current Output to Laser

26

MD

Feedback Input from Monitor Diode

27

MD_X

Monitor Diode Shunt. Connect to GND when laser diode to monitor current gain

≤ 0.005. Connect to

the MD pin for gain

≥ 0.02. For 0.005 < gain < 0.02 connect to either GND or the MD pin.

29

AMCSET

Monitor Diode Modulation-Current (Peak-to-Peak) Set Point

30

APCSET

Monitor Diode Bias-Current (Average) Set Point

31

MODMAX

but cannot add to it.

32

BIASMAX

cannot add to it.

EP

Exposed

Paddle

The exposed paddle and corner pins must be soldered to ground.