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SFP-1.25G-1310nm-2km-MM-LC


SFP-1.25G-1310nm-2km-MM-LC

Features

ü  Up to 1.25Gbps data links

ü  1310nm FP Laser and PIN photo-detector

ü  Up to 2km on 50/125µm MMF

ü  Duplex LC receptacle optical interface compliant

ü  Hot pluggable                     

ü  All-metal housing for superior EMI performance

ü  RoHS6 compliant (lead free)

ü  Operating case temperature:

Commercial: -5°C to +70°C     

Extended: -20°C to +80°C

Industrial: -40°C to +85°C                             

 

Applications

ü  Gigabit Ethernet 

ü  Fiber Channel

ü  Switch to Switch interface

ü  Switched backplane applications

ü  Router/Server interface

ü  Other optical transmission systems


Standards

ü  Compliant with SFP MSA

ü  Compliant with SFF-8472

ü  Compatible with IEEE802.3ah 2004

  

Description

The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 2km transmission distance with MMF.

The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA and SFF-8472.


Module Block Diagram

A.jpg


Absolute Maximum Ratings

Parameter

Symbol

Min.

Typical

Max.

Unit

Power Supply Voltage

VCC

0


3.6

V

Storage Temperature

Ts

-40


+85

°C

Operating Case Temperature

Tc

-40


+85

°C

Relative Humidity

RH

0


85

%

RX Input Average Power

Pmax

-


0

dBm


Recommended Operating Environment

Parameter

Symbol

Min.

Typical

Max.

Unit

Power Supply Voltage

VCC

3.13

3.3

3.46

V

Power Supply Current

Icc



300

mA

Operating Case Temperature

Commercial

TC

-5


+70

°C

Extended

-20


+80

Industrial

-40


+85

Data Rate



1.25


Gbps


Electrical Characteristics

Parameter

Symbol

Min.

Typical

Max.

Unit

Note

Transmitter Section


Input Differential   Impedance

Rin

90

100

110

Ω


Single Ended Data Input Swing

Vin PP

250


1000

mV

1

Transmit Disable Voltage

VD

Vcc – 1.3


Vcc

V


Transmit Enable Voltage

VEN

Vee


Vee+ 0.8

V


Receiver Section


Single Ended Data Output Swing

Vout PP

300


600

mV


LOS Fault

Vlos fault

Vcc – 0.5


Vcc_host

V

2

LOS Normal

Vlos norm

Vee


Vee+0.5

V

2

 

Notes:

1. Connected directly to TX data input pins. AC coupling from pins into laser driver IC.

2. LOS is an open collector output. Should be pulled up with 4.7kΩ – 10kΩ on the host board. Normal operation is logic 0; loss of signal is logic 1.

  

Optical Parameters

Parameter

Symbol

Min.

Typical

Max.

Unit

Note

Transmitter   Section

Centre Wavelength

λc

1260

1310

1360

nm


Spectral Width (RMS)

σ



3

nm


Average Optical Power (avg.)

Pout

-9


-3

dBm

1

Laser   Off Power

Poff

-

-

-45

dBm


Extinction Ratio

ER

9

-

-

dB

2

Relative Intensity Noise

RIN

-

-

-128

dB/Hz


Optical Rise/Fall Time

t/ tf


-

260

ps

3

Optical Return Loss Tolerance


-

-

12

dB


Output   Optical Eye

Compliant   with IEEE802.3z eye masks when filtered

2

Receiver   Section


Receiver Center Wavelength

λc

1260


1620

nm


Receiver Sensitivity in Average   Power

Sen

-23


-3

dBm

4

Los Assert

LOSA

-35

-

-

dBm


Los Dessert

LOSD

-

-

-24

dBm


Los Hysteresis

LOSH

0.5

-

5

dB


Overload

Pin-max

-

-

-3

dBm

4

Receiver Reflectance


-

-

-12

dB


Receiver Power (damage)


-

-

0

dBm


 

Notes:

1. The optical power is launched into 50/125µm MMF.

2. Measured with a PRBS 27-1 test pattern @1.25Gbps.

3. Unfiltered, 20-80%. Measured with a PRBS 27-1 test pattern @1.25Gbps.

4. Measured with a PRBS 27-1 test pattern @1.25Gbps, ER=10dB, BER <10-12.

 

 

Timing Characteristics

Parameter

Symbol

Min.

Typical

Max.

Unit

TX_Disable Assert Time

t_off



10

us

TX_Disable Negate Time

t_on



1

ms

Time to Initialize Include Reset of TX_FAULT

t_init



300

ms

TX_FAULT from Fault to Assertion

t_fault



100

us

TX_Disable Time to Start Reset

t_reset

10



us

Receiver Loss of Signal Assert Time

TA,   RX_LOS



100

us

Receiver Loss of Signal Deassert Time

Td,   RX_LOS



100

us

Rate-Select Change Time

t_ratesel



10

us

Serial ID Clock Time

f_serial-clock



100

kHz

 

Digital Diagnostic Monitor Characteristics (DDM)

The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified. It is compliant to SFF8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales stuff.

 

Parameter

Symbol

Min.

Max.

Unit

Temperature   Monitor Absolute Error

DMI_Temp

-3

3

°C

Laser   Power Monitor Absolute Error

DMI_TX

-3

3

dB

RX   Power Monitor Absolute Error

DMI_RX

-3

3

dB

Supply   Voltage Monitor Absolute Error

DMI_VCC

-3

3

V

Bias   Current Monitor Absolute Error

DMI_Ibias

-10%

10%

mA

  

Digital Diagnostic Memory Map (Compliant with SFF-8472)

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).

 

The diagnostic information with internal calibration or external calibration all are implementedincluding received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

 

The digital diagnostic memory map specific data field defines as following (For further information, please refer to SFF-8472).

 

 

B.png

 

Pin Definitions

C.jpg

 

 Pin Descriptions


Pin

Signal Name

Description

Plug Seq.

Notes

1

VeeT

Transmitter   Ground

1


2

TX FAULT

Transmitter Fault Indication

3

1

3

TX Disable

Transmitter Disable

3

2

4

MOD_DEF(2)

Serial Data Signal SDA

3

3

5

MOD_DEF(1)

Serial Clock Signal SCL

3

3

6

MOD_DEF(0)

Grounded in Module

3

3

7

Rate Select

Not Connected

3


8

LOS

Receiver Loss of Signal Indicator (Active  high, open-drain)

3

4

9

VeeR

Receiver Ground

1


10

VeeR

Receiver Ground

1


11

VeeR

Receiver Ground

1


12

RD-

 Inv. Received Data Out

3

5

13

RD+

Received Data Out

3

5

14

VeeR

Receiver Ground

1


15

VccR

Receiver Power Supply

2


16

VccT

Transmitter Power Supply

2


17

VeeT

Transmitter Ground

1


18

TD+

Transmit Data In

3

6

19

TD-

Inv. Transmit Data In

3

6

20

VeeT

Transmitter Ground

1

2

 

Notes:

Plug Seq.: Pin engagement sequence during hot plugging.

1. TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.

2. TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7k~10kΩ resistor. Its states are:

Low (0 to 0.8V): Transmitter on;

Between (>0.8V, < 2.0V): Undefined;

High (2.0 to 3.465V): Transmitter Disabled;

Open: Transmitter Disabled.

3. Mod-Def0, 1, 2: These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.

MOD_DEF (0) is grounded by the module to indicate that the module is present.

MOD_DEF (1) is the clock line of two wire serial interface for serial ID SCL.

MOD_DEF (2) is the data line of two wire serial interface for serial ID SDA.

4. LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.

5. RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.

6. TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

  

 Mechanical Dimensions

 

D.jpg


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