Модуль оптический SFP28 (25G), до 2км, DDM, LC/LC - TS-SFP28-25G-SM-LR-2 TELSAR

Pin

Number

Symbol

Name

Description

1,17,20

VeeT

Transmitter Signal Ground

These pins should be connected to signal ground on the host board.

2

TX Fault

Transmitter Fault Out (OC)

Logic “1” Output = Laser Fault (Laser off before t_fault) Logic “0” Output = Normal Operation

This  pin  is  open  collector  compatible,  and  should  be pulled up to Host Vcc with a 10kΩ resistor.

3

TX

Disable

Transmitter Disable In

(LVTTL)

Logic “1” Input (or no connection) = Laser off

Logic “0” Input = Laser on

This pin is internally pulled up to VccT with a 10 kΩ resistor.

4

SDA

Module Definition Identifiers

Serial ID with SFF 8472 Diagnostics

Module Definition pins should be pulled up to Host Vcc with 10 kΩ resistors.

5

SCL

6

MOD-ABS

7

RS0

Receiver Rate Select

(LVTTL) Transmitter Rate

Select (LVTTL)

These pins have an internal 30kΩ pull-down to ground. A signal  on  either  of these  pins  will  not  affect  module performance.

9

RS1

8

LOS

Loss of Signal Out (OC)

Sufficient optical signal for potential

BER < 1x10-12 = Logic “0”

Insufficient optical signal for potential

BER < 1x10-12 = Logic “1”

This  pin  is  open  collector  compatible,  and  should  be pulled up to Host Vcc with a 10kΩ resistor.

10,11,14

VeeR

Receiver Signal Ground

These pins should be connected to signal ground on the host board.

12

RD-

Receiver Negative DATA

Out (CML)

Light on = Logic “0” Output Receiver DATA output is internally AC coupled and series terminated with a 50Ω resistor.

13

RD+

Receiver Positive DATA

Out (CML)

Light on = Logic “1” Output Receiver DATA output is internally AC coupled and series terminated with a 50Ω resistor.

15

VccR

Receiver Power Supply

This pin should be connected to a filtered +3.3V power

supply  on  the  host  board.  See  Figure  3.Recommended power supply filter

16

VccT

Transmitter Power Supply

This pin should be connected to a filtered +3.3V power

supply  on  the  host  board.  See  Figure  3.Recommended power supply filter

18

TD+

Transmitter Positive DATA

In (CML)

Logic “1” Input = Light on Transmitter DATA inputs are internally AC coupled and terminated with a differential 100Ω resistor.

19

TD-

Transmitter Negative DATA

In (CML)

Logic “0” Input = Light on Transmitter DATA inputs are internally AC coupled and terminated with a differential 100Ω resistor.

Parameter

Symbol

Unit

Min

Typ

Max

Operating Case Temperature Range

Tc

oC

0

70

Power Supply Voltage

Vcc

V

3.14

3.3

3.46

Bit Rate

BR

Gb/s

25.78

Bit Error Ratio

BER

5*10-5

Max Supported Link Length

L

Km

02

Parameter

Symbol

Unit

Min

Typ

Max

Note

Supply Voltage

VCC

V

3.14

3.3

3.46

Power consumption

P

mW

1200

Transmitter

Input Differential Impedance

RIN

Ω

100

Single-ended Data Input Swing

VIN

mVp-p

90

450

Transmit Disable Voltage

VDIS

V

2

VCCHOST

Transmit Enable Voltage

VEN

V

VEE

VEE+0.8

Transmit Fault Assert Voltage

VFA

V

2

VCCHOST

Transmit Fault De-Assert Voltage

VFDA

V

VEE

VEE+0.4

Receiver

Single-ended Data Output Swing

VOD

mVp-p

200

450

LOS Fault

VLOSFT

V

2

VCCHOST

LOS Normal

VLOSNR

V

VEE

VEE+0.4

Parameter

Symbol

Unit

Min

Typ

Max

Note

Nominal Wavelength

λ

nm

1290

1310

1330

Output Power

Pav

dBm

-2

4

Spectral Width (-20dB)

σ

nm

1

Extinction Ratio

ER

dB

3.5

Side Mode Suppression Ratio

SMSR

dB

30

Average Launch Power of OFF Transmitter

POFF

dBm

-30

Center Wavelength

λC

nm

1260

1360

Receiver Sensitivity

RSENSE

dBm

-13.3

1

Receiver Overload

Pmax

dBm

0.2

Optical Return Loss

dB

-26

LOS Assert

LOSA

dBm

-30

LOS De-Assert LOS

LOSD

dBm

-17

LOS Hysteresis

dB

0.5