General Description
The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 20km transmission distance on 9/125µm SMF. The transceiver consists of three sections: a FP laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and DDMI control unit. All modules satisfy class I laser safety requirements. The transceivers are compliant with the Small Form-Factor Pluggable (SFP) Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.
Transmitter Section
Transmitter is designed for single mode fiber and operates at a nominal wavelength of 1310nm. The transmitter module uses a FP laser diode and full IEC825 and CDRH class 1 eye safety. The output power can be disabled via the single TX-disable pin. Logic LVTTL HIGH level disables the transmitter. It contains APC function, temperature compensation circuit, PECL data inputs, LVTTL TX-disable input and TX-fault Output interface.
Receiver Section
The receiver section uses a hermetic packaged front end receiver ( InGaAs PIN and preamplifier). The post amplifier is AC coupled to preamplifier through a capacitor and a low pass filter. The capacitor and LPF are enough to pass the signal from 1000Mb/s to 1300Mb/s without significant distortion or performance penalty. The LPF limits the preamplifier bandwidth to improve receiver sensitivity. As the input optical is decreased, LOS will switch from low to high. As the input optical power is increased from very low levels, LOS will switch back from high to low.
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DDMI Section
The DDMI contains an EEPROM. It provides access to sophisticated identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information. The serial interface uses the 2-wire serial CMOS EEPROM protocol defined for the FT24C02A. When the serial protocol is activated, the host generates the serial clock signal (SCL, Mod Def 1). The positive edge clocks data into those segments of the EEPROM that are not write protected within the SFP transceiver. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially. The Module provides diagnostic information about the present operating conditions. The transceiver generates this diagnostic data by digitization of internal analog signals. Calibration and alarm/warning threshold data is written during device manufacture. Received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring all are implemented. The diagnostic data are raw A/D values and must be converted to real world units using calibration constants stored in EEPROM locations 56 – 95 at wire serial bus address A2h. The digital diagnostic memory map specific data field defines as following.
Memory Map
Performance Specifications
Absolute Maximum Ratings
Note: Stress in excess of maximum absolute ratings can cause permanent damage to the module
Recommended Operating Conditions
Optical Specification
Note: 1. Minimum Sensitivity and saturation levels for a 27-1 PRBS test pattern @1.25G bps.
Electrical Specification T
Note: 2. The current excludes the output load current. 3. PECL input, internally AC-coupled and terminated. 4. Internally AC-coupled.
Diagnostics Specification
Pin Definitions
PIN Diagram
PIN Description
Notes: 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 100Ω 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.
Recommended Circuit
Package Diagram
Board Layout Hole Pattern
LC Interface
Order Information
Product Features
Uncooled Laser Diode with MQW Structure
InGaAs PIN-TIA Photodiode Receiver
Reach 20 km Transmission Distance on 9/125µm SMF
DUAL Single Mode Transceiver SFP Footprint LC Optical Interface
Compliant With SFP MSA and SFF-8472
Digital Diagnostic Monitoring Interface
Single +3.3V Power Supply
LVPECL Differential Inputs and Outputs
LVTTL Signal Detection Output
Compliant With ITU-T G.957
Compliant With RoHS and Lead Free
Metal Enclosure for Lower EMI
Operating Case Temperature:
Standard: 0 to +70°C
Extend: -20 to +85°C
Industrial: -40 to +85°C
Product Applications
Gigabit Ethernet Fiber Channel
ATM/SONET/SDH/Switch/Router
Other Optical Transmission Systems
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