RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit EthernetFeatures■ Compliant with IEEE802.3z Gigabit
Ethernet Standard■ Compliant with SFF8472 diagnostic
monitoring interface
■■■
■
■
■

Duplex LC connector
Differential LVPECL inputs and outputs
Single power supply 3.3V
TTL signal detect indicator
Hot Pluggable
Class 1 laser product complies with EN 60825-1

Ordering Information
PART NUMBER
INPUT/OUTPUT
GD850-SFP-LC.M(WT)AC/AC
GD850-SFP-LC.M

SIGNAL DETECTTTLVOLTAGE
3.3V

TEMPERATURE-20C to 85 CAC/ACTTL

3.3V

0C to 70 CRange

AccuracyUnit

Diagnostics
Parameter
Temperature-40 to 95±3oVoltage

0 to VCC± 0.1

VBias Current

0 to 120±5mA

TX Power-12 to +1± 3 dBdBm

RX Power-18 to 0± 3 dBdBm

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Calibration

C

External

RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit EthernetAbsolute Maximum Ratings
PARAMETERSYMBOL

MIN

MAX

UNITS

TS
Vcc
VIN
Io
IOP

40
0.5
0.5-----

85
4.0Vcc50400℃
VVmA
mA

SYMBOL

MIN

MAX

UNITS

NOTE

0-20
3.1
---70
85
3.5V
200℃℃

GD850-SFP-LC.M
GD850-SFP-LC.M(WT)
V
mA

Storage Temperature
Supply Voltage
Input Voltage
Output Current
Operating Current

NOTE

Recommended Operating Conditions
PARAMETER
Case Operating TemperatureTC

Supply Voltage
Supply Current

Vcc
ITX + IRX

Transmitter Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-20 C to 85 C)
SYMBOLMIN

TYP.

MAXUNITS

NOTE

62.5/125, 50/125 m fiber

AMETER

Pout-9.5----4dBm

Average

Extinction Ratio

ER9------dB

Center Wavelength
Spectral Width (RMS)

C


830
---

850
---

860
0.85

nm
nm

Rise/Fall Time, (2080%)

T r, f---

---

260

ps

Relative Intensity Noise
Total Jitter
Output Eye
Max. Pout TX-DISABLE Asserted
Differential Input Voltage

RIN
TJ

-----

POFF
VDIFF--0.4--dB/Hz
116
--227
ps
Compliant with IEEE802.3z--dBm
45--2.0V

Receiver Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-20 C to 85 C)
PARAMETER
Optical Input Power-maximum
Optical Input Power-minimum(Sensitivity)
Operating Center Wavelength
Optical Return Loss
Signal Detect-Asserted
Signal Detect-Deasserted
Differential Output Voltage
Data Output Rise, Fall Time
(2080%)Receiver Loss of Signal Output
Voltage-Low
Receiver Loss of Signal Output
Voltage-High

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SYMBOLPINMIN0TYP.
---

MAX---UNITSdBm

NOTE
BER < 1012P------18dBm

BER < 1012CORLPAPD
VDIFF

770
12--350.5-----------860--18--1.2nmdBdBmdBm
VT------0.35

ns

RX_LOSL

0---

0.5

V

RX_LOSH

2.4---VV

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RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Block Diagram of Transceiver

ELECTRICAL SUBASSEMBLY
DATA
DATA/LD Driver&Fault Sense

LASER

TX_DISABLE
TX_FAULTOPTICALSUBASSEMBLIES

(0)
(1)
(2)

MOD_DEF

DUPLEX SC
RECEPTACLE

DATA
DATA/

POST-Amp&LOS Detect

RREAMPLIFIERIC

RX_LOS

PhotoDiodeTOP VIEW (Label side)

Transmitter Section
The transmitter section consists of a 850 nm laser in an eye safe optical subassembly (OSA) which mates to the fiber cable.
The laser OSA is driven by a LD driver IC which converts differential input LVPECL logic signals into an analog laser
driving current.
TX_DISABLE
The TX_DISABLE signal is high (TTL logic “1”) to turn off the laser output. The laser will turn on when TX_DISABLE islow (TTL logic “0”).
Receiver Section
The receiver utilizes an InGaAs PIN photodiode mounted together with a trans-impedance preamplifier IC in an OSA. ThisOSA is connected to a circuit providing post-amplification quantization, and optical signal detection.
Receive Loss (RX_LOS)The RX_LOS is high (logic “1”) when there is no incoming light from the companion transceiver. This signal is normallyused by the system for the diagnostic purpose. The signal is operated in LVTTL level.

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RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet

Dimensions

DIMENSIONS ARE IN MILLIMETERSALL DIMENSIONS ARE 0.2mm UNLESS OTHERWISE SPECIFIED
Unit: mmPage 4 of 7
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RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
SFP host board mechanical layoutXYS XYA
1

LXA S
1PIN1XLA SLEGEND
1. PADS AND VIAS ARE CHASSIS GROUND
2. THROUGH HOLES, PLATING OPTIONAL
A S B S 3. HATCHED AREA DENOTES COMPONENTAND TRACE KEEPOUT(EXCEPT CHASSISGROUND)
4.AREA DENOTES COMPONENT KEEPOUT(TRACES ALLOWED)PIN1DIMENSIONS ARE IN MILLIMETERS

A SB SA S BS

Unit: mm

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RoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Assembly drawing1.7±0.9
3.5±0.3
41.73±0.5
PCB

BEZEL

11.0 REF.

9.8 MAX0.4±0.1 BELOW PCB

15.0 MAX

15.25±0.1

PCB

DIMENSIONS ARE IN MILLIMETERS

Unit: mm

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16.25±0.1
MSA-SPECIFIED BEZEL

10.4±0.1

CAGE ASSEMBLYRoHS compliant
850 nm Multi-mode Transceiver, 1000Base-SX
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Pin-Out

Pin Assignment

Pin

PIN 11PIN 20

PIN 10

PIN 1Signal Name

Description

1TGND

Transmit Ground2

TX_FAULTTransmit Fault

34

TX_DISABLE
MOD_DEF (2)Transmit Disable
SDA Serial Data Signal

5MOD_DEF (1)SCL Serial Clock Signal

67

MOD_DEF (0)RATE SELECTTTL Low
Open Circuit

8RX_LOS

Receiver Loss of Signal, TTL High, open collector

9

RGND
RGND

Receiver Ground

1011

RGND

Receiver Ground
Receiver Ground

12RX

Receive Data Bar, Differential PECL, ac coupled

1314RX
RGND

Receive Data, Differential PECL, ac coupled
Receiver Ground

15VCCR

Receiver Power Supply

16Transmitter Power Supply

17VCCTTGND

18TXTransmit Data, Differential PECL, ac coupled

19TX
TGND

Transmit Data Bar, Differential PECL, ac coupled

20

Transmitter Ground

Transmitter Ground

Eye Safety MarkThe LM2 series multimode transceiver is a class 1 laser
product. It complies with EN 60825-1 and FDA 21 CFR
1040.10 and 1040.11. In order to meet laser safety
requirements the transceiver shall be operated within
the Absolute Maximum Ratings.
CautionAll adjustments have been done at the factory before
the shipment of the devices. No maintenance anduser serviceable part is required. Tampering withand modifying the performance of the device will
result in voided product warranty.

Required MarkClass 1 Laser ProductComplies with
21CFR 1040.10 and 1040.11

Note : All information contained in this document is subject to change without notice.

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