25Gb/s BIDI SFP28 Transceiver 10KM Industrial Temperature
LAS28-T2733(3327)S-LRI
Product Features
Supports bit rates up to 25.78Gbps
SFP28 package with single LC receptacle
Hot-pluggable capability
Single 3.3V power supply
DFB transmitter and high performance PIN receiver
Up to 10km transmission distance over SMF
Low power consumption <1.4W
Compatible with RoHS
Single +3.3V power supply
Real Time Digital Diagnostic Monitoring
Operating case temperature: Industrial: -40 to +85ºC
Applications
25 Gigabit Ethernet LR
CPRI/eCPRI
Product Description
Link-all's 25G BIDI SFP28 10KM transceivers are high performance, cost effective modules supporting data rate
upto 25.78Gbps and 10km transmission distance with SMF.
The transceiver consists of three sections: a DFB-LD 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. |
Typ. |
Max. |
Unit |
Note |
| Storage Temperature |
Ts |
-40 |
- |
+85 |
ºC |
|
| Relative Humidity |
RH |
5 |
- |
85 |
% |
|
| Power Supply Voltage |
VCC |
-0.5 |
- |
4.5 |
V |
|
Recommended Operating Conditions
| Parameter |
Symbol |
Min. |
Typ. |
Max. |
Unit |
Note |
| Case Operating Temperature |
Industrial |
TOP |
-40 |
- |
+85 |
ºC |
Without air flow |
| Power Supply Voltage |
VCC |
3.135 |
3.3 |
3.465 |
V |
|
| Power Supply Current |
ICC |
|
|
400 |
mA |
|
| Data Rate |
BR |
|
25.78 |
|
Gbps |
|
| Transmission Distance |
TD |
|
- |
10 |
km |
|
| Coupled fiber |
Single mode fiber |
9/125um SMF |
Notes:
1. The optical power is launched into SMF.
2. PECL input, internally AC-coupled and terminated.
3. Measured with a PRBS 231- 1 test pattern @25.78Gps, BER ≤5× 10-5 .
4. Internally AC-coupled.
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 |
Pin Function Definitions
| Pin |
Signal Name |
Description |
Plug Seq. |
Notes |
| 1 |
VEET |
Transmitter Ground |
1 |
|
| 2 |
TX FAULT |
Transmitter Fault Indication |
3 |
1 |
| 3 |
TX DISABLE |
Transmitter Disable |
3 |
2 |
| 4 |
SDA |
SDA Serial Data Signal |
3 |
|
| 5 |
SCL |
SCL Serial Clock Signal |
3 |
|
| 6 |
MOD_ABS |
Module Absent. Grounded within the
module |
3 |
|
| 7 |
RS0 |
Not Connected |
3 |
|
| 8 |
LOS |
Loss of Signal |
3 |
3 |
| 9 |
RS1 |
Not Connected |
3 |
|
| 10 |
VEER |
Receiver ground |
1 |
|
| 11 |
VEER |
Receiver ground |
1 |
|
| 12 |
RD- |
Inv. Received Data Out |
3 |
4 |
| 13 |
RD+ |
Received Data Out |
3 |
4 |
| 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 |
5 |
| 19 |
TD- |
Inv. Transmit Data In |
3 |
5 |
| 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~ 10k Ω 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. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
3. LOS is open collector output. Should be pulled up with 4.7k~ 10kΩ on host board to a voltage between
2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
4. 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.
5. TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with
100Ω differential termination inside the module.
Diagnostics
| Parameter |
Unit |
Accuracy |
Calibration |
| Temperature |
°C |
±3°C |
Internal |
| Voltage |
V |
±3% |
Internal |
| Bias Current |
mA |
±10% |
Internal |
| TX Power |
dBm |
±3dB |
Internal |
| RX Power |
dBm |
±3dB |
Internal |
Digital Diagnostic Memory MapThe 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.
Ordering Information
| Ordering P/Ns |
Description |
| LAS28-T2733S-LRI |
25Gb/s BIDI SFP28 Transceiver 1270nmTx/1330nmRx 10KM DDM,
LC/UPC Receptacle, Industrial Temperature |
| LAS28-T3327S-LRI |
25Gb/s BIDI SFP28 Transceiver 1330nmTx/1270nmRx 10KM DDM,
LC/UPC Receptacle, Industrial Temperature |
Notes:
1.Industrial case operating temperature is -40 ~ +85 °C. If you need 0 ~ +70 °C products, delete " I" after Part
Number.
2.If you need more customized services, please contact us.
Warnings
Handling Precautions:
This device is susceptible to damage as a result of electrostatic discharge (ESD). A static free environment is
highly recommended. Follow guidelines according to proper ESD procedures.
Laser Safety:
Radiation emitted by laser devices can be dangerous to human eyes. Avoid eye exposure to direct or indirect
radiation.
Notice:
The information provided on this page contains the product target specifications which are subject to change
without notice.
Check with Link-all Sales Office for product updates, changes in specifications, sample availability and
production release dates.
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