Page 1
Part Number
Description
GLC-SX-MMD-C
GE/FC SFP 850nm LC Connectors 550m on MMF, with DOM function.
PROLABS – GLC-SX-MMD-C
1.25GBd SFP (Small Form Pluggable) Short Wavelength (850nm) Transceiver
GLC-SX-MMD-C Overview
PROLABS’s GLC-SX-MMD-C SFP optical transceivers are based on Gigabit Ethernet IEEE 802.3 standard and Fiber
Channel FC-PI Rev.5.0 and provide a quick and reliable interface for the GE/FC application. The Digital
diagnostics functions are available via 2-wire serial bus specif ied in the SFP MSA. In addition, they comply with
the Small Form Factor Pluggable Multi Sourcing Agreement (MSA) and SFF-8472.
Product Features
Up to 1.25 GBd bi-directional data links
Compliant with IEEE 802.3z Gigabit Ethernet and 1000BASE-SX
Compliant with SFP MSA
Hot-pluggable SFP footprint
850nm VCSEL laser transmitter
Duplex LC connector
Built-in digital diagnostic functions
Up to 550m on 50/125um MMF
Up to 300m on 62.5/125um MMF
Single power supply 3.3V
RoHS Compliance
Class 1 laser product complies with EN 60825-1
Operating temperature range: -5℃ to 85℃.
Applications
1.25 GBd Gigabit Ethernet
1.063 GBd Fiber Channel
Ordering Information
Page 2
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
Data Rate
DR
1.25
GBd
IEEE 802.3
1.062
FC-PI-2 Rev 5
Bit Error Rate
BER
10
12
Operating Temperature
T
OP
5 85
℃
Case temperature
Storage Temperature
T
STO
40 85
℃
Ambient temperature
Supply Current
I
S
180
240
mA
For electrical power interface
Input Voltage
V
CC
3
3.3
3.6
V
Maximum Voltage
V
MAX
0.5
4 V
For electrical power interface
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
Output Optical Power
50/125um fiber, NA=0.2
62.5/125um fiber, NA-0.275
P
TX
9.5 3
dBm
Class 1 Product
Optical Center Wavelength
C
830 860
nm
Optical Modulation [email protected]
OMA
156
uW
Equivalent extinction
ratio specification for FC
Extinction [email protected]
ER
9
dB
Spectral Width (RMS)
0.85
nm
Optical Rise/Fall Time (20% - 80%)
T
RF_IN
100
150
ps
Relative Intensity Noise
RIN
120
dB/Hz
Deterministic Jitter Contribution
TX_DJ
20
60
ps
Total Jitter Contribution
TX_TJ
65
125
ps
Mask Margin
45%
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
Optical Receiver Power
P
RX
17 0
dBm
Average
Optical Center Wavelength
C
770 860
nm
Receiver Sensitivity @ 1.063GBd
R
X_SEN1
20
dBm
FC-PI-2 Rev.5
Receiver Sensitivity @ 1.25GBd
R
X_SEN2
20
dBm
IEEE 802.3
Optical Return Loss
ORL
12
dB
Receiver Electrical 3dB Upper cutoff
frequency
1500
MHz
Loss of Signal-Asserted
P
LOS_A
30
dBm
Loss of Signal-Deasserted
P
LOS_D
20
dBm
Loss of Signal-Hysteresis
0.5
dB
General Specifications
Optical Characteristics – Transmitter
VCC=3V to 3.6V, TC=-5℃ to 85℃
Optical Characteristics – Receiver
VCC=3V to 3.6V, TC=-5℃ to 85℃
Page 3
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
Input differential impedance
R
IN
100 Ω
Non condensing
Single ended data input swing
V
IN_PP
250
1200
mV
Transmit disable voltage
V
D
2 V
CC
V
Transmit enable voltage
V
EN
V
EE
VEE+0.8
V
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
Single ended data output swing
V
OUT_PP
250
450
550
mV
Data output rise time (20%-80%)
T
R
90
175
ps
Data output fall time (20%-80%)
T
F
90
175 ps
LOS Fault
V
LOS_Fault
2
V
CC_HOST
V
LOS Normal
V
LOS_normal
V
EE
VEE+0.5
V
Electrical Characteristics – Transmitter
VCC=3V to 3.6V, TC=-5℃ to 85℃
Electrical Characteristics – Receiver
VCC=3V to 3.6V, TC=-5℃ to 85℃
Digital Diagnostic Functions
GLC-SX-MMD-C support the 2-wire serial communication protocol as defined in the SFP MSA. Digital diagnostic
information are accessible over the 2-wire interface at the address 0xA2. Digital Diagnostics for GLC-SX-MMD-C
are internally calibrated by default. A micro controller unit inside the transceiver gathers the monitoring
information and reports the status of transceiver.
Transceiver Temperature, internally measured, represented as a 16 bit signed twos complement value in
increments of 1/256 degrees Celsius, Temperature accuracy is better than ±3 degrees Celsius over specified
operating temperature and voltage.
Transceiver Supply Power, internally measured, represented as a 16 bit unsigned integer with the voltage
defined as the full 16 bit value (0 – 65535) with LSB equal to 100 µVolt, yielding a total range of 0 to +6.55 Volts.
Transceiver TX bias current, internally measured, represented as a 16 bit unsigned integer with the current
defined as the full 16 bit value (0 – 65535) with LSB equal to 2 µA, yielding a total range of 0 to 131mA.
Accuracy is better than ±10% over specified operating temperature and voltage.
Transceiver TX output power, internally measured, represented as a 16 bit unsigned integer with the power
defined as the full 16 bit value (0 – 65535) with LSB equal to 0.1 µW. Data is assumed to be based on
measurement of laser monitor photodiode current. Accuracy is better than ±3dB over specified temperature and
voltage. Data is not valid when the transmitter is disabled.
Transceiver RX received optical power, internally measured, represented as a 16 bit unsigned integer with
the power defined as the full 16 bit 35 value (0 – 65535) with LSB equal to 0.1 µW. Accuracy is better than ±3dB
over specified temperature and voltage.
Page 4
ELECTRICAL
Micro
TX_FAULT
TX_DATA
TX_DATA\
TX_DISABLE
RX_DATA
RX_DATA\
RX_LOS
MOD_DEF2
MOD_DEF1
MOD_DEF0
OPTICAL
OPTICAL SUBASSEMBLY
PRE
AMP
DUPLEX LC
RECEPTACL
E
Safety Control
LD Driver
Limiting Amp
LOS Detect
Block Diagram of Transceiver
Transmitter Section
The VCSEL driver accept differential input data and provide bias and modulation currents for driving a laser. An
automatic power-control (APC) feedback loop is incorporated to maintain a constant average optical power. 850
nm VCSEL in an eye safe optical subassembly (OSA) mates to the fiber cable.
TX_DISABLE
The TX_DISABLE signal is high (TTL logic “1”) to turn off the laser output. The laser will turn on within 1ms
when TX_DISABLE is low (TTL logic “0”).
TX_FAULT
When the TX_FAULT signal is high, output indicates a laser fault of some kind. Low indicates normal operation.
Receiver Section
The receiver utilizes a PIN detector integrated with a trans-impedance preamplifier in an OSA. This OSA is
connected to a Limiting Amplifier which providing post-amplification quantization, and optical signal detection.
The limiting Amplifier is AC-coupled to the transimpedance amplifier, with internal 100Ω differential termination.
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 TTL level.
Controller Section
The micro controller unit monitors the operation information of LD driver and Limiting Amplifier. And report these
status to the customer.
Page 5
Dimensions
ALL DIMENSIONS ARE ±0.2mm UNLESS OTHERWISE SPECIFIED
UNIT: mm
Page 6
PCB Layout Recommendation
Page 7
Towards
Bezel
1
10
11
20
Towards
ASIC
Electrical Pad Layout
Page 8
PIN #
Symbol
Description
Remarks
1
V
EET
Transmitter ground (common with receiver ground)
Circuit ground is isolated
from chassis ground
2
T
FAULT
Transmitter Fault. Not supported
3
T
DIS
Transmitter Disable. Laser output disable on high or
open
Disabled: T
DIS
>2V or
open
Enabled: T
DIS
<0.8V
4
MOD_DEF (2)
Module Definition 2. Data line for serial ID
Should Be pulled up with
4.7k – 10k ohm on host
board to a voltage
between
2V and 3.6V
5
MOD_DEF (1)
Module Definition 1. Clock line for serial ID
6
MOD_DEF (0)
Module Definition 0. Grounded within the module
7
Rate Select
No connection required
8
LOS
Loss of Signal indication. Logic 0 indicates normal
operation
LOS is open collector
output
9
V
EER
Receiver ground (common with transmitter ground)
Circuit ground is isolated
from chassis ground
10
V
EER
Receiver ground (common with transmitter ground)
11
V
EER
Receiver ground (common with transmitter ground)
12
RD–
Receiver Inverted DATA out. AC coupled
13
RD+
Receiver Non-inverted DATA out. AC coupled
14
V
EER
Receiver ground (common with transmitter ground)
Circuit ground is isolated
from chassis ground
15
V
CCR
Receiver power supply
16
V
CCT
Transmitter power supply
17
V
EET
Transmitter ground (common with receiver ground)
Circuit ground is
connected to chassis
ground
18
TD+
Transmitter Non-Inverted DATA in. AC coupled
19
TD–
Transmitter Inverted DATA in. AC coupled
20
V
EET
Transmitter ground (common with receiver ground)
Circuit ground is
connected to chassis
ground
Pin Assignment
References
1. IEEE standard 802.3. IEEE Standard Department, 2002.
2. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September
2000.
3. Fiber Channel Draft Physical Interface Specification (FC-PI-2 Rev.5).
4. Digital Diagnostics Monitoring Interface for Optical Transceivers – SFF-8472.
Loading...