1.25Gbps Cisco Compatible Industrial Gigabit 1000BASE-LX SMF SFP Transceiver – 1310nm LC 20km
The PDT-SFP-03-1G-1310-2000-I is an industrial spec, low-cost, high-performance Small Form Pluggable (SFP) transceiver which is specifically designed for fiber communications with up to 1.25Gbps data rate, using SMF, over a distance of up to 20km.
This device is compatible with most vendors including Cisco, Parallax Digital Technologies, Meraki, D-Link, Ubiquiti, Supermicro, Netgear, Broadcom, Mikrotik, Robustel.
The transceiver consists of a VCSEL transmitter, a PIN photodiode, integrated with a trans-impedance pre-amplifier, and an MCU control unit.
The module is fully compliant with Class I Laser Safety Requirements.
Access to internal Digital Diagnostic Memory Maps is possible using a 2-wire serial interface at addresses A0h and A2h.
This is the industrial variant of this product and a narrower temperature range variant is also available as part of the Commercial SFP Product Line.
Block Diagram:
Pin Definitions:
| Pin |
Signal Name |
Description |
Plug Seq. |
Notes |
| 1 |
VEET |
Transmitter Ground |
1 |
|
| 2 |
TX FAULT |
Transmitter Fault Indication |
3 |
Note1 |
| 3 |
TX DISABLE |
Transmitter Disable |
3 |
Note2 |
| 4 |
MOD_DEF(2) |
SDA Serial Data Signal |
3 |
Note3 |
| 5 |
MOD_DEF(1) |
SCL Serial Clock Signal |
3 |
Note3 |
| 6 |
MOD_DEF(0) |
TTL Low |
3 |
Note3 |
| 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 |
RX- |
Inv. Received Data Out |
3 |
Note 5 |
| 13 |
RX+ |
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 |
TX+ |
Transmit Data In |
3 |
Note 6 |
| 19 |
TX- |
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 not supported and is always connected to ground.
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 4.7 ¨C 10 K resistor. Its states are:
– Low (0 to 0.8V): Transmitter on
– (>0.8, < 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 to 10K 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 AC-coupled, differential lines with 100 differential termination inside the module.
6) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100 differential termination inside the module.
Interface:
Optical & Electrical Characteristics:
| Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Notes |
| Transmitter |
| Centre Wavelength |
λc |
1260 |
1310 |
1360 |
nm |
|
| Spectral Width (RMS) |
σ |
|
|
4 |
nm |
|
| Average Output Power |
Pout |
-9 |
|
-3 |
dBm |
1 |
| Extinction Ratio |
ER |
9 |
|
|
dB |
|
| Optical Rise/Fall Time |
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 |
|
1580 |
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 |
|
0.8 |
V |
|
Notes:
- The optical power is launched into SMF.
- PECL input, internally AC-coupled and terminated.
- Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
- Internally AC-coupled.
Timing & 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 |
-40 to +85 |
°C |
±3°C |
Internal / External |
| 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 0 |
dBm |
±3dB |
Internal / External |
Diagnostic Memory Map:
Recommended Operating Conditions:
| Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
| Operating Case Temperature |
Commercial |
Tc |
-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 |
|
Absolute Max Ratings:
| Parameter |
Symbol |
Min |
Max |
Unit |
| Supply Voltage |
Vcc |
-0.5 |
4.5 |
V |
| Storage Temperature |
Ts |
-40 |
+85 |
°C |
| Operating Humidity |
– |
5 |
85 |
% |
