Ascent’s SFP28 transceivers are designed for use in 25G Gigabit Ethernet links with distances up to 10 km over single-mode fiber. These transceivers include a PIN photo detector diode and FP transmitter. Digital diagnostic functions are available via a 2-wire interface.
• Up to 10 km transmission distance
• FP transmitter and PIN photo-detector
• Duplex LC connector
• Metal enclosure, for lower EMI
• Electrical interface compliant to SFF-8431 specifications
• 2-wire interface for management specifications compliant with SFF-8472
• Compliant with SFP+ MSA
• Single 3.3V power supply
• Power dissipation < 1.2W
• Case operating temperature range: Commercial: 0 °C to +70 °C
• Industrial: -40 °C to +85 °C
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Storage Temperature | Ts | ‑40 | ‑ | 85 | °C | |
Relative Humidity | RH | 5 | ‑ | 95 | % | |
Power Supply Voltage | VCC | ‑0.3 | ‑ | 4 | V |
Recommended Operating Conditions
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Case Operating Temperature | Tcase | 0 | ‑ | 70 | °C | Commercial |
‑40 | ‑ | 85 | °C | Industrial | ||
Power Supply Voltage | VCC | 3.14 | 3.3 | 3.47 | V | |
Power Supply Current | ICC | ‑ | ‑ | 300 | mA | Commercial |
‑ | ‑ | 360 | mA | Industrial | ||
Data Rate | BR | 24.3 | 25.78 | 26.5 | Gbps | |
Transmission Distance | TD | ‑ | ‑ | 10 | km | |
Coupled Fiber | Single‑mode fiber | 9/125 µm SMF |
Electrical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Supply Voltage | Vcc | 3.14 | 3.3 | 3.46 | V | |
Supply Current | Icc | 300 | mA | Commercial | ||
360 | mA | Industrial | ||||
Transmitter | ||||||
Input Differential Impedance | Rin | 100 | Ω | 1 | ||
Differential Data Input Swing | Vin,pp | 180 | 800 | mV | ||
Transmit Disable Voltage | VDIS | Vcc‑1.3 | Vcc | V | ||
Transmit Enable Voltage | VEN | Vee | Vee+ 0.8 | V | 2 | |
Receiver | ||||||
Differential Data Output Swing | Vout,pp | 300 | 850 | mV | 3 | |
LOS Fault | VLOS fault | Vcc‑1.3 | VCCHOST | V | 4 | |
LOS Normal | VLOS norm | Vee | Vee+0.8 | V | 4 |
Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Or open circuit.
3. Into 100 Ω differential termination.
4. Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.
Optical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Transmitter | ||||||
Average Output Power | POUT | ‑5 | 2 | dBm | 1 | |
Optical Wavelength | λ | 1295 | 1325 | nm | ||
Spectral Width (RMS) | σ | 1 | nm | |||
Optical Extinction Ratio | ER | 3.5 | dB | |||
Receiver | ||||||
Rx Sensitivity | RSEN | ‑13.3 | dBm | 2 | ||
Input Saturation Power (Overload) | PSAT | 0.5 | dBm | |||
Input Optical Wavelength | λC | 1295 | 1325 | nm | ||
LOS De ‑Assert | LOSD | ‑14 | dBm | |||
LOS Assert | LOSA | ‑30 | dBm | |||
LOS Hysteresis | 0.5 | dB |
Notes:
1. Class 1 Laser Safety per FDA/CDRH and IEC‑825‑1 regulations.
2. Measured with a PRBS 231‑1 test pattern @ 25.78 Gb/s, BER @ 5*10‑5.
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