MITSUBISHI (OPTICAL DEVICES)

MF-622DS-T12-43x/45x/46x

MF-622DS-R13-24x

SONET/SDH TRANSMITTER & RECEIVER

TRANSMITTER PIN ALLOCATION

No.

Symbol

Description

No.

Symbol

Description

1

NC

No user connection

20

NC

No user connection

2

Lbs(+)

Laser-bias monitor(+)

19

Lbf(+)

Laser-backface monitor(+)

3

NC

No user connection

18

Vcc

Vcc

4

Lbs(-)

Laser-bias monitor(-)

17

Lbf(-)

Laser-backface monitor(-)

5

GND

Ground

16

Data

Data

6

Vcc

Vcc

15

Data

Data

7

Td

Transmitter disable

14

GND

Ground

8

Vcc

Vcc

13

GND

Ground

9

Vcc

Vcc

12

Vcc

Vcc

10

NC

No user connection

11

GND

Ground

PIN DESCRIPTIONS

Pin No.

Function

I/O

Pin description

5,11,

13,14

GND

I

These pin are the module’s ground connections.

They should be connected to a low impedance ground plane (0V).

6,8,9,

12,18

Vcc

I

This is the power supply pin for the module.

It should be connected to +5.0V.

Recommended power supply decoupling.

15,16

Data & Data

I

This data input pin modulates the laser diode. When the Dat a input is assert ed, the

laser diode is turned on.

Signal level of these pin are PECL level and internal Vbb bias. Refer t o electrical

interface in NOTE1.

7

Transmitter disable

I

The transmitter is nomally enabled and only requires an external voltage to disable.

Refer to electrical interface in NOTE2.

2,4

Laser-bias

monitor(+),

Laser-bias monitor(-)

O

The laser bias current is calculat ed as a rat io of the volt age to an int ernal 10-ohm

sensing resistor.

Ib[mA]={Lbs(+)-Lbs(-)}[mV]/10

Refer to electrical interface in NOTE3.

17,19

Laser-backface

monitor(+),

Laser-backface

monitor(-)

O

The laser backface monitor is calculated as a ratio of t he voltage to an internal 200-

ohm sensing resistor.

Ibf[mA]={Lbf(+)-Lbf(-)}[mV]/200

Refer to electrical interface in NOTE3.

1,3,

10,20

NC

-

These pin are No user connection and should be left open.