1.25Gbps SFP Bi-Directional Transceiver, 20km Reach
1550nm TX / 1310 nm RX
FTCS-B1512-20Dxxxx
Features
- Dual data-rate of 1.25Gbps/1.063Gbps operation
- 1550nm DFB laser and PIN photodetector for 20km transmission
- Compliant with SFP MSA and SFF-8472 with simplex LC or SC 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 range of
0°C to +70°C (Commercial) or -40°C to +85°C (Industrial)
Applications
- Gigabit Ethernet
- Fiber Channel
- Switch to Switch interface
- Switched backplane applications
- Router/Server interface
- Other optical transmission systems
Description
The SFP-BIDI 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 DFB 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.
Module Block Diagram
Vcc
Temp
TD+/-
TxFault
TxDis
LOS
RD+/-
SCL
SDA
LD Driver
LD
PIN+TIA
Post Amp
MCU
EEPROM
ADC/DAC
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
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
||
|
Operating Case Temperature |
Commercial |
Tc |
0 |
+70 |
°C |
||
|
Industrial |
-40 |
+85 |
°C |
||||
|
Power Supply Voltage |
Vcc |
3.13 |
3.3 |
3.47 |
V |
||
|
Power Supply Current |
Icc |
300 |
mA |
||||
|
Data Rate |
Gigabit Ethernet |
1.25 |
Gbps |
||||
|
Fiber Channel |
1.063 |
||||||
Optical and Electrical Characteristics
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Notes |
||
|
Transmitter |
||||||||
|
Centre Wavelength |
λc |
1530 |
1550 |
1570 |
nm |
|||
|
Spectral Width (-20dB) |
∆λ |
1 |
nm |
|||||
|
Side Mode Suppression Ratio |
SMSR |
30 |
dB |
|||||
|
Average Output Power |
Pout |
-9 |
-3 |
dBm |
1 |
|||
|
Extinction Ratio |
ER |
9 |
dB |
|||||
|
Optical Rise/Fall Time (20%~80%) |
tr/tf |
0.26 |
ns |
|||||
|
Data Input Swing Differential |
VIN |
400 |
1800 |
mV |
2 |
|||
|
Input Differential Impedance |
ZIN |
90 |
100 |
110 |
Ω |
|||
|
TX Disable |
Disable |
2.0 |
Vcc |
V |
||||
|
Enable |
0 |
0.8 |
V |
|||||
|
TX Fault |
Fault |
2.0 |
Vcc |
V |
||||
|
Normal |
0 |
0.8 |
V |
|||||
|
Receiver |
||||||||
|
Centre Wavelength |
λc |
1260 |
1360 |
nm |
||||
|
Receiver Sensitivity |
-23 |
dBm |
3 |
|||||
|
Receiver Overload |
-3 |
dBm |
3 |
|||||
|
LOS De-Assert |
LOSD |
-24 |
dBm |
|||||
|
LOS Assert |
LOSA |
-35 |
dBm |
|||||
|
LOS Hysteresis |
1 |
4 |
dB |
|||||
|
Data Output Swing Differential |
Vout |
400 |
1800 |
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 27-1 test pattern @1250Mbps, BER ≤1×10-12.
4. Internally AC-coupled.
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 |
||
|
MOD_DEF (0:2)-High |
VH |
2 |
Vcc |
V |
|
|
MOD_DEF (0:2)-Low |
VL |
0.8 |
V |
Diagnostics Specification
|
Parameter |
Range |
Unit |
Accuracy |
Calibration |
|
Temperature |
0 to +70 |
°C |
±3°C |
Internal / External |
|
-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 -3 |
dBm |
±3dB |
Internal / External |
|
RX Power |
-23 to -3 |
dBm |
±3dB |
Internal / External |
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.
Pin Definitions
Pin Diagram
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 |
Note 4 |
|
9 |
VEER |
Receiver ground |
1 |
|
|
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.
