Ascent’s DDM SFP+ transceivers are designed for use in 6.25 Gigabit Ethernet links with distances up to 300 m over multi-mode fiber. These transceivers include a PIN photo detector diode and VSCEL transmitter. Digital diagnostic functions are available via a 2-wire interface.
• Supports up to 6.25 Gb/s bit rates with DDM
• Up to 300 m transmission distance on MMF
• VSCEL transmitter and PIN photo-detector
• Metal enclosure, for lower EMI
• 2-wire interface with integrated digital diagnostic monitoring
• Hot-pluggable SFP+ footprint
• Specifications compliant with SFF 8431 and SFF 8472
• Compliant with SFP+ MSA
• Single 3.3 V power supply
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Maximum Supply Voltage | Vcc | 3.15 | ‑ | 3.46 | V | |
Storage Temperature | TS | ‑40 | ‑ | 85 | °C | |
Case Operating Temperature | Tcase | 0 | ‑ | 70 | °C | Commercial |
‑40 | ‑ | 85 | °C | Industrial |
Electrical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Supply Voltage | Vcc | 3.15 | 3.3 | 3.46 | V | |
Supply Current | Icc | 300 | mA | |||
Transmitter | ||||||
Input Differential Impedance | Rin | 100 | Ω | 1 | ||
Differential Data Input Swing | Vin,pp | 180 | 700 | mV | ||
Transmit Disable Voltage | VDIS | Vcc‑1.3 | Vcc | V | ||
Transmit Enable Voltage | VEN | Vee | Vee+ 0.8 | V | 2 | |
Transmit Disable Assert Time | 10 | us | ||||
Receiver | ||||||
Differential Data Output Swing | Vout,pp | 300 | 850 | mV | 3 | |
Data Output Rise Time | tr | 28 | ps | 4 | ||
Data Output Fall Time | tf | 28 | ps | 4 | ||
LOS Fault | VLOS fault | Vcc‑1.3 | VCCHOST | V | 5 | |
LOS Normal | VLOS norm | Vee | Vee+0.8 | V | 5 |
Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Or open circuit.
3. Into 100 Ω differential termination.
4. 20 % to 80 %.
5. 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 | ‑6 | ‑1 | dBm | 1 | |
Optical Wavelength | λ | 830 | 860 | nm | ||
Spectral Width (RMS) | σ | 0.85 | nm | |||
Optical Extinction Ratio | ER | 3.5 | dB | |||
RIN | RIN | ‑128 | dB/Hz | |||
Receiver | ||||||
Rx Sensitivity | RSEN | ‑12 | dBm | 2 | ||
Input Saturation Power (Overload) | PSAT | ‑1 | dBm | |||
Input Optical Wavelength | λC | 830 | 860 | nm | ||
LOS De ‑Assert | LOSD | ‑13 | dBm | |||
LOS Assert | LOSA | ‑30 | dBm | |||
LOS Hysteresis | 0.5 | 1.0 | dB |
Notes:
1. Class 1 Laser Safety per FDA/CDRH and IEC‑825‑1 regulations.
2. With worst‑case extinction ratio. Measured with a PRBS 231‑1 test pattern, BER<10‑12.
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