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DPD-248SX 1.25Gb/s 850nm Multi-mode SFP Transceiver

1000 BASE-T Copper Small Form Pluggable (SFP) transceivers are based on the SFP Multi Source Agreement (MSA).They are compatible with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std 802.3 . The 1000 BASE-T physical layer IC (PHY) can be accessed via I2C, allowing access to all PHY settings and features.
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1.  GENERAL DESCRIP

Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the VCSEL laser and the PIN photo-detector .The module data link up to 550m in 50/125um multi mode fiber.

The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access. 

 

Features 

● Up to 1.25Gb/s data links,up to 550m

● on 50/125um multi mode fiber

● VCSEL laser transmitter and PIN photo-detector

● Duplex LC/UPC type pluggable optical interface

● Low power dissipation

● Metal enclosure, for lower EMI

● RoHS compliant and lead-free

● Compliant with SFF-8472, Support Digital

● Diagnostic Monitoring interface

● Single +3.3V power supply

● Case operating temperature

  Commercial: 0℃ to +70℃

  Extended: -10℃ to +80℃

  Industrial: -40℃ to +85℃

We could not find any corresponding parameters, please add them to the properties table

Pin

Symbol

Name/Description

NOTE

1

VEET

Transmitter Ground (Common with Receiver Ground)

1

2

TFAULT

Transmitter Fault.

 

3

TDIS

Transmitter Disable. Laser output disabled on high or open.

2

4

MOD_DEF(2)

Module Definition 2. Data line for Serial ID.

3

5

MOD_DEF(1)

Module Definition 1. Clock line for Serial ID.

3

6

MOD_DEF(0)

Module Definition 0. Grounded within the module.

3

7

Rate Select

No connection required

4

8

LOS

Loss of Signal indication. Logic 0 indicates normal operation.

5

9

VEER

Receiver Ground (Common with Transmitter Ground)

1

10

VEER

Receiver Ground (Common with Transmitter Ground)

1

11

VEER

Receiver Ground (Common with Transmitter Ground)

1

12

RD-

Receiver Inverted DATA out. AC Coupled

 

13

RD+

Receiver Non-inverted DATA out. AC Coupled

 

14

VEER

Receiver Ground (Common with Transmitter Ground)

1

15

VCCR

Receiver Power Supply

 

16

VCCT

Transmitter Power Supply

 

17

VEET

Transmitter Ground (Common with Receiver Ground)

1

18

TD+

Transmitter Non-Inverted DATA in. AC Coupled.

 

19

TD-

Transmitter Inverted DATA in. AC Coupled.

 

20

VEET

Transmitter Ground (Common with Receiver Ground)

1

Notes:

1.Circuit ground is internally isolated from chassis ground.

2.Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.

3.Should be pulled up with 4.7k - 10kohms on host board to a voltage between 2.0V and 3.6V.MOD_DEF (0) pulls line low to indicate module is plugged in.

4.This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:

Low (0 – 0.8V): Reduced Bandwidth

(>0.8, < 2.0V): Undefined

High (2.0 – 3.465V):Full Bandwidth

Open: Reduced Bandwidth

5.LOS is open collector output should be pulled up with 4.7k - 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

 

4. ABSOLUTE MAXIMUM RATING

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Storage Temperature

Ts

-40

 

85

ºC

 

Relative Humidity

RH

5

 

95

%

 

Power Supply Voltage

VCC

-0.5

 

4

V

 

Signal Input Voltage

 

-0.3

 

Vcc+0.3

V

 

Receiver Damage Threshold

 

+5

 
 

dBm

 

 

5. RECOMMENDED OPERATING ENVIRONMENT

 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Case Operating Temperature

Tcase

0

 

70

ºC

commercial

-10

 

80

extended

-40

 

85

industrial

Power Supply Voltage

VCC

3.13

3.3

3.47

V

 

Power Supply Current

ICC

 
 

280

mA

 

Power Supply Noise Rejection

 
 
 

100

mVp-p

100Hz to 1MHz

Data Rate

 
 

1250/1250

 

Mbps

TX Rate/RX Rate

Transmission Distance

 
 
 

550

M

 

Coupled Fiber

Multi mode fiber

50/125um MMF

 

6. OPTICAL CHARACTERISTICS

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter

Average Output Power

POUT

-9

 

-3

dBm

Note (1)

Extinction Ratio

ER

9

   

dB

 

Center Wavelength

λC

830

850

860

nm

VCSEL Laser

Spectrum Bandwidth(RMS)

σ

   

0.85

nm

Transmitter OFF Output Power

POff

   

-45

dBm

 

Differential Line Input Impedance

RIN

90

100

110

Ohm

 

Output Eye Mask

Compliant with IEEE802.3 z (class 1 laser safety)

   

Receiver

Input Optical Wavelength

λIN

770

850

860

nm

PIN-TIA

Receiver Sensitivity

PIN

   

-17

dBm

Note (2)

Input Saturation Power (Overload)

PSAT

0

   

dBm

 

Los Of Signal Assert

PA

   

-18

dBm

 

Los Of Signal De-assert

PD

-35

   

dBm

Note (3)

LOS Hysteresis

PA-PD

0.5

2

6

dB

 

Note (1): Measure at 2^7-1 NRZ PRBS pattern

Note (2): Measured with Light source 850nm, ER=9dB; BER =<10^-12 @PRBS=2^7-1 NRZ

Note (3): When LOS de-asserted, the RX data+/- output is High-level (fixed)

 

7.  DIGITAL DIAGNOSTIC FUNCTIONS

The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.

The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

Digital diagnostics for the transceivers are internally calibrated by default. The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified

 

Parameter

Symbol

Min.

Max

Unit

Note

Temperature monitor absolute error

DMI_Temp

-3

3

°C

 

Supply voltage monitor absolute error

DMI_VCC

-0.1

0.1

V

 

Bias current monitor

DMI_Ibias

-10%

10%

mA

 

Laser power monitor absolute error

DMI_TX

-3

3

dBm

 

RX power monitor absolute error

DMI_RX

-3

3

dBm

 

 

8. ELECTRICAL CHARACTERISTICS

 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter

Total Supply Current

ICC

 
 

A

mA

Note (1)

Transmitter Disable Input-High

VDISH

2

 

Vcc+0.3

V

 

Transmitter Disable Input-Low

VDISL

0

 

0.8

V

 

Transmitter Fault Input-High

VTxFH

2

 

Vcc+0.3

V

 

Transmitter Fault Input-Low

VTxFL

0

 

0.8

V

 

Receiver

Total Supply Current

ICC

 
 

B

mA

Note (1)

LOSS Output Voltage-High

VLOSH

2

 

Vcc+0.3

V

LVTTL

LOSS Output Voltage-Low

VLOSL

0

 

0.8

V

Note (1): A (TX) + B (RX) = 280mA(Not include termination circuit)

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