Product Features
Standard: 0 to +70°C
Applications
Description
The SFP28 transceivers are high performance, cost effective modules supporting data rate of 25.78Gbps and 70m transmission distance with OM3 MMF or 100m transmission distance with OM4 MMF.
The transceiver consists of three sections: a VCSEL 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 and SFF-8472 digital diagnostics functions.
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 |
Tc |
0 |
|
+70 |
°C |
Power Supply Voltage |
Vcc |
3.135 |
3.30 |
3.465 |
V |
Power Supply Current |
Icc |
|
|
300 |
mA |
Data Rate |
|
|
25.78 |
|
Gbps |
Optical and Electrical Characteristics
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Notes |
||
Transmitter |
||||||||
Centre Wavelength |
λc |
840 |
850 |
860 |
nm |
|
||
Spectral Width(RMS) |
Δλ |
|
|
0.6 |
nm |
|
||
Side-Mode Suppression Ratio |
SMSR |
- |
- |
- |
dB |
|
||
Average Output Power |
Pout |
-8.4 |
|
2.4 |
dBm |
1 |
||
Extinction Ratio |
ER |
2.0 |
|
|
dB |
|
||
Data Input Swing Differential |
VIN |
180 |
|
950 |
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 |
840 |
850 |
860 |
nm |
|
||
Receiver Sensitivity |
|
|
|
-10 |
dBm |
3 |
||
Receiver Overload |
|
2.4 |
|
|
dBm |
3 |
||
LOS De-Assert |
LOSD |
|
|
-13 |
dBm |
|
||
LOS Assert |
LOSA |
-30 |
|
|
dBm |
|
||
LOS Hysteresis |
|
0.5 |
|
4 |
dB |
|
||
Data Output Swing Differential |
Vout |
500 |
700 |
900 |
mV |
4 |
||
LOS |
High |
2.0 |
|
Vcc |
V |
|
||
Low |
|
|
0.8 |
V |
|
Notes:
Timing and Electrical
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Tx Disable Negate Time |
t_on |
|
|
2 |
ms |
Tx Disable Assert Time |
t_off |
|
|
100 |
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 |
|
100 |
400 |
KHz |
MOD_DEF (0:2)-High |
VH |
2 |
|
Vcc |
V |
MOD_DEF (0:2)-Low |
VL |
|
|
0.8 |
V |
Diagnostics
Parameter |
Range |
Unit |
Accuracy |
Calibration |
Temperature |
0 to +70 |
°C |
±3°C |
Internal |
Voltage |
3.0 to 3.6 |
V |
±3% |
Internal |
Bias Current |
0 to 20 |
mA |
±10% |
Internal |
TX Power |
-8.0 to 3 |
dBm |
±3dB |
Internal |
RX Power |
-14 to 0 |
dBm |
±3dB |
Internal |
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.