Specification

25Gb/s SFP28 1310nm 10km Fiber Channel Transceiver Module

PH-SFP28/25G-LR

FEATURES

  • Up to 25Gb/s data links
  • 1310nm DFB laser and PIN receiver
  • Up to 10km on 9/125um SMF
  • Hot-pluggable SFP footprint
  • Digital diagnostic capabilities
  • Class 1 laser safety certified
  • Cost effective SFP28 solution, enables higher port densities and greater bandwidth
  • RoHS compliant and lead-free
  • Single +3.3V power supply
  • 2-wire interface for management specifications compliant with SFF 8472 digital diagnostic monitoring interface for optical transceivers
  • All-metal housing for superior EMI performance
  • Case operating temperature Commercial: 0 ~ +70℃

APPLICATIONS

  • High-speed storage area networks
  • Computer cluster cross-connect
  • Custom high-speed data pipes

Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter

Symbol

Unit

Min

Max

Storage Temperature Range

Ts

-40

85

Relative Humidity

RH

%

5

95

Maximum Supply Voltage

Vcc

V

-0.5

3.6

Damage Threshold

THd

dBm

3

 

Recommended Operating Conditions and Power Supply Requirements

Parameter

Symbol

Unit

Min

Typ

Max

Note

Operating Case Temperature Range

Tc

0

 

70

commercial

Power Supply Voltage

Vcc

V

3.135

3.3

3.465

 

Data Rate

 

Gb/s

 

25

   

Control Input Voltage High

 

V

2

 

Vcc

 

Control Input Voltage Low

 

V

0

 

0.8

1

Link Distance (SMF)

D

KM

   

10

9/125um

General Description

PH-SFP28/25G-LR 25Gb/s SFP28 transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the DFB laser and the PIN photo-detector .The module data link up to 10km in 9/125um single mode fiber.

The SFP28 LR module electrical interface is compliant to SFI electrical specifications. The transmitter input and receiver output impedance is 100 Ohms differential. Data lines are internally AC coupled. The module provides differential termination and reduce differential to common mode conversion for quality signal termination and low EMI. SFI typically operates over 200 mm of improved FR4 material or up to about 150mmof standard FR4 with one connector.

The transmitter converts 25Gbit/s serial PECL or CML electrical data into serial optical data compliant with the 25GBASE-LR standard. An open collector compatible Transmit Disable (Tx_Dis) is provided. Logic “1” or no connection on this pin will disable the laser from transmitting. Logic “0” on this pin provides normal operation. The transmitter has an internal automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature variations. An open collector compatible Transmit Fault (Tx_Fault) is provided. TX_Fault is module output contact that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety. The TX_Fault output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host with a resistor in the range 4.7-10 kΩ. TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP28 module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor.

The receiver converts 25Gbit/s serial optical data into serial PECL/CML electrical data. An open collector compatible Loss of Signal is provided. Rx_LOS when high indicates an optical signal level below that specified in the relevant standard. The Rx_LOS contact is an open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or with an active termination. Power supply filtering is recommended for both the transmitter and receiver. The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP28 is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.

Pin Assignment and Pin Description

Figure1. Diagram of host board connector block pin numbers and names

Pin Descriptions

Pin

Symbol

Name

Ref.

1

VeeT

Transmitter ground

1

2

TX Fault

Transmitter fault indication

 

3

Tx Disable

Disables the transmitter or laser output

2

4

SDA

Data line for an I2C series interface

2

5

SCL

Clock line for an I2C series interface

 

6

Mod_ABS

Indicates the module online state (this pin is connected to the VeeT or VeeR pin)

 

7

RS0

Selects a rate for the module (this pin is connected to the 33 kilohm resistor)

 

8

RX_LOS

Indicates a loss of received signals

 

9

RS1

Selects a rate for the module (this pin is connected to the 33 kilohm resistor)

 

10

VeeR

Receiver ground

1

11

VeeR

Receiver ground

1

12

RD-

Inverse received data output

 

13

RD+

Received data output

 

14

VeeR

Receiver ground

1

15

VccR

3.3 V receiver power

 

16

VccT

3.3 V transmitter power

 

17

VeeT

Transmitter ground

1

18

TD+

Transmit data input

 

19

TD-

Inverse transmit data input

 

20

VeeT

Transmitter ground

1

Notes:

1. Module ground pins GND are isolated from the module case.

2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.45V on the host board.

Electric Ports Definition

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter

Symbol

Min.

Typ.

Max

Unit

Notes

Power Consumption

p

   

1.5

W

 

Supply Current

Icc

   

450

mA

 

Transmitter

Single-ended Input Voltage Tolerance

Vcc

-0.3

 

4.0

V

 

common mode voltage tolerance

 

15

   

mV

 

Differential Input Voltage Swing

Vin,pp

180

 

700

mVpp

 

Differential Input Impedance

Zin

90

100

110

Ohm

1

Transmit Disable Assert Time

     

10

us

 

Transmit Disable Voltage

Vdis

Vcc-1.3

 

Vcc

V

 

Transmit Enable Voltage

Ven

Vee

 

Vee +0.8

V

2

Receiver

Single-ended Input Voltage Tolerance

Vcc

-0.3

 

4.0

V

 

Differential Output Voltage Swing

Vout,pp

300

 

900

mVpp

 

Differential Output Impedance

Zout

90

100

110

Ohm

3

Data output rise/fall time

Tr/Tf

9.5

   

ps

4

LOS Assert Voltage

VlosH

Vcc-1.3

 

Vcc

V

5

LOS De-assert Voltage

VlosL

Vee

 

Vee +0.8

V

5

Notes:

1. Connected directly to TX data input pins. AC coupled thereafter.

2. Or open circuit.

3. Input 100 ohms differential termination.

4. These are unfiltered 20-80% values.

5. Loss of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.

Optical Characteristics

The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter

Symbol

Min.

Typical

Max

Unit

Notes

Transmitter

Center Wavelength

λC

1290

1310

1330

nm

 

Optical Spectral Width

∆λ

   

1

nm

 

Average Optical Power

PAVG

-8.4

 

3

dBm

1

Side Mode Suppression Ratio

SMSR

30

   

dB

 

Optical Extinction Ratio

ER

3.5

   

dB

 

Transmitter OFF Output Power

Poff

   

-30

dBm

 

Transmitter and Dispersion Penalty

TDP

   

4.4

dB

 

Optical Return Loss Tolerance

ORLT

   

12

dB

 

Transmitter Eye Mask

Compliant with IEEE802.3ae

 

Receiver

Center Wavelength

λC

1260

1310

1360

nm

 

Receiver Sensitivity in average power

Sen.

   

-10.4

dBm

2

Receiver Sensitivity in OMA

Sen.

   

-8.6

dBm

2

Stressed Sensitivity (OMA)

     

-6.8

dBm

2

Input Saturation Power (overload)

Psat

0.5

   

dBm

 

LOS Assert

LOSA

-22

   

dBm

 

LOS De-assert

LOSD

   

-11.5

dBm

 

Optical Return Loss

ORL

12

   

dB

 

LOS Hysteresis

LOSH

0.5

   

dB

 

Notes:

1. Class 1 Laser Safety per FDA/CDRH and IEC-825-1 regulations.

2. Measured with Light source 1310nm, ER=3.5dB; BER =<10^-12 @ PRBS=2^31-1 NRZ.

Mechanical Dimensions

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