SFP-1.25G-LX 1.25Gbps SFP Optical Transceiver, 10KM Reach

Transcription

1 VER 1.0 / SFP-1.25G-LX 1.25Gbps SFP Optical Transceiver, 10KM Reach 1 Feature nm FP laser and PIN photo detector 1.2 Meet SFP MSA and SFF-8472 with LC receptacle 1.3 Digital diagnostic monitoring KM transmission with SMF 1.5 Hot-pluggable 1.6 Metal enclosure for lower EMI V Single power supply 1.8 Qualified to meet the intent of Bellcore reliability practices 1.9 LVPECL logic interface simplifies interface to external circuitry 1.10 LVTTL logic level RX LOS 1.11 With pull de-latch 1.12 With 9/125 µm single mode fiber (SMF) 1.13 Operate data rate:1.25gb/s; 1.14 operate temperature Standard :0 to +70 C,Extended : -20 to +85 C,industrial : -40 to +85 C 1.15 Complies with RoHS directive 2 Application 2.1 ATM 2.2 SONET 2.3 Fiber Channel 2.4 Gigabit Ethernet 2.5 Switches 2.6 Routers 2.7 Hubs 3 General The optical transceiver is compliant with the Small Form-Factor Pluggable (SFP) Multi-Source Agreement (MSA) and SFF It offers previously unavailable system cost, upgrade, and reliability benefits by virtue of being hot-pluggable. The optical transceiver is ROHS compliant; each of the components is lead-free. 1 of 8

2 RD+/- LOS Post Amp PIN TD+/- TxDis TxFault LD Driver LD Temp Vcc A/D convertor SDA SCL EEPROM Memory Digital Diagnostic Monitoring Interface The optical transceiver 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 ATMEL AT24C01A/02/04 family of components. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF For further information, please refer to SFP MSA. 2 wire address X (A0h) 2 wire address X (A2h) 0 0 Alarm and Warning Thresholds (56 bytes) Serial ID Defined by SFP MSA (96 bytes) Vendor Specific (32 bytes) Reserved (128 bytes) Cal Constants (40 bytes) Real Time Diagnostic Interface (24 bytes) Vendor Specific (8 bytes) User Writable EEPROM (120 bytes) Vendor Specific (8 bytes) 2 of 8

3 4 Performance Specifications 4.1 Absolute Maximum Ratings Parameter Symbol Min. Max. Unit Note Storage Temperature Tst C - Input Voltage - GND Vcc V - Power Supply Voltage Vcc-Vee V Recommended Operating Conditions Operating Case Temperature P Symbol Min Typical Max Unit Standard C Tc industrial C Power Supply Voltage Vcc V Power Supply Current Icc 300 ma Data Rate 1.25 Gbps 3 of 8

4 4.3 Optical and Electrical Characteristics Parameter Symbol Min Typical Max Unit Notes Transmitter Centre Wavelength λc nm Spectral Width (RMS) λ 0.85 nm Average Output Power Pout -8-2 dbm 1 Extinction Ratio ER 9 db Optical Rise/Fall Time (20%~80%) tr/tf 0.26 ns Data Input Swing Differential V IN mv 2 Input Differential Impedance Z IN Ω TX Disable TX Fault Disable 2.0 Vcc V Enable V Fault 2.0 Vcc V Normal V Receiver Centre Wavelength λc nm Receiver Sensitivity -24 dbm 3 Receiver Overload 0 dbm 3 LOS De-Assert LOS D -27 dbm LOS Assert LOS A -30 dbm LOS Hysteresis 1 4 db Data Output Swing Differential Vout mv 4 LOS High 2.0 Vcc V Low 0.8 V Notes: 1. The optical power is launched into SMF. 2. PECL input, internally AC-coupled and terminated. 3. Measured with a PRBS test BER Internally AC-coupled. 4 of 8

5 5 Pin Definitions 5.1 Pin Diagram 20 VeeT 1 VeeT 19 TD- 2 Tx Fault 18 TD+ 3 Tx Disable 17 VeeT 4 MOD-DEF(2) 16 VccT 5 MOD-DEF(1) 15 VccR 6 MOD-DEF(0) 14 VeeR 7 Rate Select 13 RD+ 8 LOS 12 RD- 9 VeeR 11 VeeR 10 VeeR Top of Board Bottom of Board (as viewed thru top of board) 5.2 Pin Descriptions Pin# Name Function Notes 1 VeeT Transmitter Ground - 2 TX Fault Transmitter Fault Indication Note 1 3 TX Disable Transmitter Disable Note 2, Module disables on high or open 4 MOD-DEF2 Module Definition 2 Note 3, 2 wire serial ID interface 5 MOD-DEF1 Module Definition 1 Note 3, 2 wire serial ID interface 6 MOD-DEF0 Module Definition 0 Note 3, Grounded in Module 7 Rate Select Not Use - 8 LOS Loss of Signal Note 4 9 VeeR Receiver Ground Note 5 10 VeeR Receiver Ground Note 5 11 VeeR Receiver Ground Note 5 12 RD- Inv. Received Data Out Note 6 13 RD+ Received Data Out Note 6 5 of 8

6 Pin# Name Function Notes 14 VeeR Receiver Ground Note 5 15 VccR Receiver Power Note 7, 3.3V± 5% 16 VccT Transmitter Power Note 7, 3.3V± 5% 17 VeeT Transmitter Ground Note 5 18 TD+ Transmit Data In Note 8 19 TD- Inv. Transmit Data In Note 8 20 VeeT Transmitter Ground Note 5 Notes: 1. TX Fault is an open collector/drain output, which should be pulled up with a 4.7K 10KΩ resistor on the host board. Pull up voltage between 2.0V and VccT, R+0.3V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 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 KΩ resistor. Its states are: Low (0 0.8V): Transmitter on (>0.8, < 2.0V): Undefined High ( V): 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 (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K 10KΩ resistor. Pull up voltage between 2.0V and VccT, R+0.3V. When high, this output indicates the received optical power is below the worst-case receiver sensitivity (as defined by the standard in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.8V. 5. VeeR and VeeT may be internally connected within the SFP module. 6. RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which should be terminated with 100Ω (differential) at the user SERDES. The AC coupling is done inside the module and is thus not required on the host board. 7. VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the SFP connector pin. Maximum supply current is 300mA. Recommended host board power supply filtering is shown below. Inductors with DC resistance of less than 1Ω should be used in order to maintain the required voltage at the SFP input pin with 3.3V supply voltage. When the recommended supply filtering network is used, hot plugging of the SFP transceiver module will result in an inrush current of no more than 30 ma greater than the steady state value. VccR and VccT may be internally connected within the SFP transceiver module. 8. TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω differential termination inside the module. The AC coupling is done inside the module and is thus not required on the host board. 6 of 8

7 6 Package Information 7 Recommended Circuit VCC 10uF 0.1uF 1uH Vcc_T 0.1uF Tx_Disable Tx_Fault Z=50 ohms TD+ C Z=50 ohms TD- C R Laser Driver &eye safety circuitry Protocol IC SerDes IC Vcc_R Z=50 ohms 10uF 0.1uF RD+ C VCC R Z=50 ohms RD- Rx_LOS C REF_RATE AMPLIFICATION &QUANTIZATION PLD/PAL mod_def2 mod_def1 mod_def0 EEPROM VEER NOTE: 4.7K ohms<<10k ohms 7 of 8

8 8 Pattern Layout of SFP Printed Circuit Board (Unit: mm) 10 Ordering Information Part Number Product Description SFP-1.25G-LX 1310nm, 1.25Gbps, 10KM, 0ºC ~ +70ºC SFP-1.25G-L 1310nm, 1.25Gbps, 10KM, 0ºC ~ +70ºC, With Digital Diagnostic Monitoring SFP-1.25G-LD 1310nm, 1.25Gbps, 10KM, -40ºC ~ +85ºC SFP-1.25G-LE 1310nm, 1.25Gbps, 10KM, -40ºC ~ +85ºC, With Digital Diagnostic Monitoring 8 of 8