Pin List

Mnemonic:

Pad and Pin No.:

Pin Type:

Description:

SDIP

SDIN

4

5

CML IN

Data inputs. Internally terminated with 50 W to TDIP/TDIN.

TDIP

TDIN

3

6

CML IN

Loop through termination pins for SDIP and SDIN respectively.

SCIP

SCIN

9

10

CML IN

Clock inputs. Internally terminated with 50 W to TCIP/TCIN.

TCIP

TCIN

8

11

CML IN

Loop through termination pins for SDIP and SDIN respectively.

IM

29, 30

OPEN

COLLECTOR

Laser Driver Output (2.5 Gbit/s). IM sinks a modulation current,

which is controlled by the pin IMSET. A logic HI on SDIP corre-

sponds to IM sinking current.

IMB

31, 32

OPEN

COLLECTOR

Laser Driver inverted Output (2.5 Gbit/s). IMB sinks a modulation

current, which is controlled by the pin IMSET. Connect to VCC

through 20 to 25 W.

IB

27

OPEN

COLLECTOR

Pre-bias current output. IB sinks a current, which is controlled by

the pin IMC.

IMSET

40

ANL OUT

Modulation current control monitor output. This pin is the output of

the modulation current control loop OP-amp. For stability a capa-

citor may be added between this pin and the IMC pin.

IBSET

22

ANL OUT

Pre-bias current control monitor output. This pin is the output of

the optical power control loop OP-amp. For stability a capacitor

may be added between this pin and the OPSET pin.

IBM

23

ANL OUT

Pre-bias current mirror output. The sink current into the IBM pin is

1/20 of the pre-bias current.

IMM

39

ANL OUT

Modulation current mirror output. The sink current into the IMM

pin is 1/20 of the modulation current. Internally IMM is connected

to the positive input of the modulation current control loop

OP-amp.

AR

25

ANL OUT

Anti-rush current sink. AR sinksa1mA current when SHDW is

high. Typically connected together with PD to the monitor diode.

MARKP

MARKN

35

36

ANL OUT

Mark-space monitor outputs. High impedance CML outputs.

MTJ

38

ANL OUT

Temperature monitor.

IMC

41

ANL IN

Modulation current setting. The modulation current will automati-

cally be adjusted to this value if the internal modulation control

loop is used. The IMC pin is the negative input of the modulation

current control loop OP-amp.

PD

26

ANL IN

Positive input of the automatic optical power control loop OP-amp,

used to control the pre-bias current. Typically connected to the

monitor diode photo detector of the laser diode.

OPSET

19

ANL IN

Negative input of the automatic optical power control loop

OP-amp, used to control the pre-bias current. Typically connected

to an external reference voltage.

FFSET

15

LVTTL IN

When FFSET is low data is re-timed. When high data re-timing is

bypassed.

SHDW

16

LVTTL IN

Modulation and pre-bias current shutdown input.

Set high for shutdown, low for normal operation.

DUTY

48

ANL IN

Input for control of the mark-space ratio of the output. Decreasing

the voltage of the DUTY pin increases the pulse width of a current

high into the IM pin. Typically connected to VEE through resistor.

VCC

14, 18, 20, 28, 33,

42, 46

PWR

Positive supply pins for laser driver part.

VCCCONT

44

PWR

Positive supply pin for modulation current control system.

Data Sheet Rev.: 11

GD16521

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