1 Gigabit Long-Wavelength SFP Transceiver

1.25G SFP 1310NM 20KM
1.25Gbps SFP Optical Transceiver, 20km Reach
Features

Dual data-rate of 1.25Gbps/1.063Gbps operation

1310nm FP laser and PIN photodetector for 20km transmission

Compliant with SFP MSA and SFF-8472 with duplex LC receptacle

Digital Diagnostic Monitoring:
Internal Calibration or External Calibration

Compatible with SONET OC-24-LR-1

Compatible with RoHS

+3.3V single power supply

Operating case temperature:
Standard :
0 to +70°C
Industrial : -40 to +85°C
Applications

Gigabit Ethernet

Fiber Channel

Switch to Switch interface

Switched backplane applications

Router/Server interface

Other optical transmission systems
Description
The SFP transceivers are high performance, cost effective modules supporting dual data-rate of
1.25Gbps/1.0625Gbps and 20km transmission distance with SMF.
The transceiver consists of three sections: a FP laser transmitter, a PIN photodiode integrated with a
trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety
requirements.
The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further
information, please refer to SFP MSA.
Data sheet Rev 1.0
1/9
TD+/TxFault
TxDis
LD Driver
LD
Post Amp
PIN+TIA
LOS
RD+/-
Vcc
I2C Controller
SCL
SDA
EEPROM
ADC/DAC
Temp
Absolute Maximum Ratings
Table 1 - Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Supply Voltage
Vcc
-0.5
4.5
V
Storage Temperature
Ts
-40
+85
°C
Operating Humidity
-
5
85
%
Recommended Operating Conditions
Table 2 - Recommended Operating Conditions
Parameter
Symbol
Standard
Operating Case Temperature
Power Supply Voltage
Vcc
Power Supply Current
Icc
Data sheet Rev 1.0
Typical
Max
Unit
0
+70
°C
-40
+85
°C
3.47
V
300
mA
Tc
Industrial
Data Rate
Min
3.13
3.3
1.25
Gbps
2/9
Optical and Electrical Characteristics
SFP 1.25G 20KM: (FP and PIN, 1310nm, 20km Reach)
Table 3 - Optical and Electrical Characteristics
Parameter
Symbol
Min
Typical
Max
Unit
1310
1360
nm
4
nm
0
dBm
Notes
Transmitter
Centre Wavelength
λc
Spectral Width (RMS)
∆λ
Average Output Power
Pout
-9
Extinction Ratio
ER
9
Optical Rise/Fall Time (20%~80%)
tr/tf
Data Input Swing Differential
VIN
400
Input Differential Impedance
ZIN
90
1260
1
dB
100
0.26
ns
1800
mV
110
Ω
2
Disable
2.0
Vcc
V
Enable
0
0.8
V
Fault
2.0
Vcc
V
Normal
0
0.8
V
1360
nm
-23
dBm
3
dBm
3
TX Disable
TX Fault
Receiver
Centre Wavelength
λc
1260
Receiver Sensitivity
Receiver Overload
-3
LOS De-Assert
LOSD
LOS Assert
LOSA
LOS Hysteresis
Data Output Swing Differential
-24
-35
dBm
dBm
1
4
dB
Vout
370
1800
mV
High
2.0
Vcc
V
0.8
V
4
LOS
Low
Notes:
1. The optical power is launched into SMF.
2. PECL input, internally AC-coupled and terminated.
7
-12
3. Measured with a PRBS 2 -1 test pattern @1250Mbps, BER ≤1×10 .
4. Internally AC-coupled.
Data sheet Rev 1.0
3/9
Timing and Electrical
Table 4 - Timing and Electrical
Parameter
Symbol
Min
Typical
Max
Unit
Tx Disable Negate Time
t_on
1
ms
Tx Disable Assert Time
t_off
10
µs
Time To Initialize, including Reset of Tx Fault
t_init
300
ms
Tx Fault Assert Time
t_fault
100
µs
Tx Disable To Reset
t_reset
10
µs
LOS Assert Time
t_loss_on
100
µs
LOS De-assert Time
t_loss_off
100
µs
Serial ID Clock Rate
f_serial_clock
400
KHz
Vcc
V
0.8
V
MOD_DEF (0:2)-High
VH
MOD_DEF (0:2)-Low
VL
2
Diagnostics
Table 5 – Diagnostics Specification
Parameter
Range
Unit
Accuracy
Calibration
°C
±3°C
Internal / External
0 to +70
Temperature
-40 to +85
Voltage
3.0 to 3.6
V
±3%
Internal / External
Bias Current
0 to 100
mA
±10%
Internal / External
TX Power
-9 to 0
dBm
±3dB
Internal / External
RX Power
-23 to -3
dBm
±3dB
Internal / External
Data sheet Rev 1.0
4/9
Digital Diagnostic Memory Map
The transceivers provide serial ID memory contents and diagnostic information about the present
operating conditions by the 2-wire serial interface (SCL, SDA).
The diagnostic information with internal calibration or external calibration all are implemented, including
received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage
monitoring and temperature monitoring.
The digital diagnostic memory map specific data field defines as following.
Data sheet Rev 1.0
5/9
Pin Definitions
Pin Diagram
Data sheet Rev 1.0
6/9
Pin Descriptions
Pin
Signal Name
Description
Plug Seq.
Notes
1
VEET
Transmitter Ground
1
2
TX FAULT
Transmitter Fault Indication
3
Note 1
3
TX DISABLE
Transmitter Disable
3
Note 2
4
MOD_DEF(2)
SDA Serial Data Signal
3
Note 3
5
MOD_DEF(1)
SCL Serial Clock Signal
3
Note 3
6
MOD_DEF(0)
TTL Low
3
Note 3
7
Rate Select
Not Connected
3
8
LOS
Loss of Signal
3
9
VEER
Receiver ground
1
Note 4
10
VEER
Receiver ground
1
11
VEER
Receiver ground
1
12
RD-
Inv. Received Data Out
3
Note 5
13
RD+
Received Data Out
3
Note 5
14
VEER
Receiver ground
1
15
VCCR
Receiver Power Supply
2
16
VCCT
Transmitter Power Supply
2
17
VEET
Transmitter Ground
1
18
TD+
Transmit Data In
3
Note 6
19
TD-
Inv. Transmit Data In
3
Note 6
20
VEET
Transmitter Ground
1
Notes:
Plug Seq.: Pin engagement sequence during hot plugging.
1) TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage
between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low
state, the output will be pulled to less than 0.8V.
2) TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a
4.7k~10kΩ resistor. Its states are:
Low (0 to 0.8V):
Transmitter on
(>0.8V, < 2.0V):
Undefined
High (2.0 to 3.465V):
Transmitter Disabled
Open:
Transmitter Disabled
3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board.
The pull-up voltage shall be VccT or VccR.
Mod-Def 0 is grounded by the module to indicate that the module is present
Mod-Def 1 is the clock line of two wire serial interface for serial ID
Mod-Def 2 is the data line of two wire serial interface for serial ID
4) LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and
Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to
less than 0.8V.
5) RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be
terminated with 100Ω (differential) at the user SERDES.
6) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential
termination inside the module.
Data sheet Rev 1.0
7/9
Recommended Interface Circuit
Data sheet Rev 1.0
8/9
Mechanical Dimensions
Data sheet Rev 1.0
9/9
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