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

SIGNAL DETECTVOLTAGE

TEMPERATURE

GD850-SFP-LC.M

AC/ACTTL

3.3V

0°C to 70 °C

GD850-SFP-LC.M(WT)

AC/AC

TTL

3.3V

Option:-20°C to 85 °C

Range

Accuracy

Unit

Calibration

Diagnostics
Parameter
Temperature-40 to 95±3oVoltage

0 to VCC± 0.1

V

Bias Current

0 to 120±5mA

TX Power-12 to +1± 3 dBdBm

RX Power-18 to 0± 3 dBdBm

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C

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External

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

Absolute Maximum Ratings
PARAMETERSYMBOL

MIN

MAX

UNITS

NOTE

Storage TemperatureTS−4085°C

Supply Voltage

Vcc

−0.5

4.0

V

Input Voltage

VIN

−0.5

Vcc

V

Output Current

Io

---

50mA

Operating Current

IOP---400mA

SYMBOL

MIN

MAX

UNITS

NOTE

070°C

GD850-SFP-LC.M-2085°C

GD850-SFP-LC.M(WT)

Recommended Operating Conditions
PARAMETER
Case Operating TemperatureTC

Supply Voltage

Vcc

3.13.5V

Supply Current

ITX + IRX---200mA

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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

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

TYP.

MAXUNITSNOTE
Average

Output Optical Power62.5/125, 50/125 μm fiber

Pout-9----3dBm

Extinction Ratio

ER9------dB

Center WavelengthλC830

850860nm

Spectral Width (RMS)

Δλ---

---

0.85

nm

Rise/Fall Time, (20−80%)

Tr, f------

260

ps

Relative Intensity NoiseRIN---

---

−116

dB/Hz

Total Jitter

TJ------

227ps

Output Eye

Compliant with IEEE802.3z

Max. Pout TX-DISABLE Asserted

POFF

---

---

−45

dBm

Differential Input Voltage

VDIFF

0.4

---

2.0

V

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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

Receiver Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 °C to 70 °C (-20 °C to 85 °C)
PARAMETERSYMBOLMIN

TYP.

MAXUNITS

NOTE

Optical Input Power-maximum

PIN-3------dBm

BER < 10−12

Optical Input Power-minimum(Sensitivity)

PIN

---

---

−18dBm

BER < 10−12

Operating Center Wavelength

λC770---

860nm

Optical Return Loss

ORL

12------dB

Signal Detect-Asserted

PA---

---

−18dBmSignal Detect-Deasserted

PD−35------dBm

Differential Output Voltage

VDIFF

0.5---

1.2VT r, f------0.35

nsRX_LOSL

0---

0.5

VRX_LOSH

2.4---VCC

V

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

ELECTRICAL SUBASSEMBLY
DATA
DATA/LD Driver&Fault Sense

LASER

TX_DISABLE
TX_FAULTOPTICALSUBASSEMBLIES

(0)
(1)

MOD_DEF

DUPLEX SC
RECEPTACLE

(2)

DATA
DATA/

POST-Amp&LOS Detect

RREAMPLIFIERIC

RX_LOS

Photo
Diode

TOP 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. Thelaser OSA is driven by a LD driver IC which converts differential input LVPECL logic signals into an analog laser drivingcurrent.
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 is low(TTL logic “0”).
Receiver Section
The receiver utilizes an InGaAs PIN photodiode mounted together with a trans-impedance preamplifier IC in an OSA. This OSA
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 normally used 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: 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

SFP host board mechanical layout
XYS XYA
1

LX A S

1PIN1

LX A SLEGENDA SB SPIN1

1.PADS AND VIAS ARE CHASSIS GROUND
2.THROUGH HOLES, PLATING OPTIONAL
3.HATCHED AREA DENOTES COMPONENTAND TRACE KEEPOUT(EXCEPT CHASSISGROUND)
4.AREA DENOTES COMPONENT KEEPOUT(TRACES ALLOWED)DIMENSIONS ARE IN MILLIMETERS

A SB SA SB S

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 drawing
1.7¡ 0Ó.9
3.5¡ 0Ó.3
41.73¡ Ó
0.5
PCB

15.25¡ 0Ó.1

10.4¡ 0Ó.1

11.0 REF.

9.8 MAXCAGE ASSEMBLY

0.4¡ 0Ó.1 BELOW PCB

15.0 MAX

BEZEL

16.25¡ 0Ó.1
MSA-SPECIFIED BEZELPCBDIMENSIONS ARE IN MILLIMETERSUnit: 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

Pin Assignment
Pin-Out

PIN 11

PIN 20

PIN 10

PIN 1PinSignal Name

Description

12345678910111213
1415
16
17181920

TGND
TX_FAULTTX_DISABLE
MOD_DEF (2)
MOD_DEF (1)
MOD_DEF (0)RATE SELECT
RX_LOS
RGND
RGND
RGNDTransmit Ground
Transmit Fault
Transmit Disable
SDA Serial Data Signal
SCL Serial Clock Signal
TTL Low
Open Circuit
Receiver Loss of Signal, TTL High, open collector
Receiver Ground
Receiver Ground
Receiver Ground
Receive Data Bar, Differential PECL, ac coupled
Receive Data, Differential PECL, ac coupled
Receiver Ground
Receiver Power Supply
Transmitter Power Supply
Transmitter Ground
Transmit Data, Differential PCEL, ac coupled
Transmit Data Bar, Differential PCEL, ac coupled
Transmitter Ground

RX−
RX+
RGND
VCCR
VCCTTGND
TX+TX−
TGND

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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

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.

Required MarkClass 1 Laser ProductComplies with21 CFR 1040.10 and 1040.11

CautionAll adjustments have been done at the factory before
the shipment of the devices. No maintenance and user
serviceable part is required. Tampering with andmodifying the performance of the device will result in
voided product warranty.
Note : All information contained in this document is subject to change without notice.

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