Ascent Communication Technology

6.25G SFP+ LRM 1330 nm 2 km

Ascent’s SFP+ transceivers are designed for use in 6.25 Gigabit Ethernet links with distances up to 2 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 2 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

Absolute Maximum Ratings

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	‑		360	mA
Data Rate	BR		6.25		Gbps
Transmission Distance	TD		2		km
Coupled Fiber	Single‑mode fiber					9/125 µm SMF

Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	Vcc	3.15	3.3	3.46	V
Supply Current	Icc			360	mA
Transmitter
Input Differential Impedance	Rin		100		Ω	1
Differential Data Input Swing	Vin,pp	180		600	mV
Transmit Disable Voltage	V_DIS	Vcc‑1.3		Vcc	V
Transmit Enable Voltage	V_EN	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	V_LOS fault	Vcc‑1.3		V_CCHOST	V	5
LOS Normal	V_LOS 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	P_OUT	‑6.5		0.5	dBm	1
Optical Wavelength	λ	1260		1355	nm
Spectral Width (RMS)	σ			3.5	nm
Optical Extinction Ratio	ER	3.5			dB
RIN	RIN			‑128	dB/Hz
Receiver
Rx Sensitivity	R_SEN			‑14.4	dBm	2
Input Saturation Power (Overload)	P_SAT	0.5			dBm
Input Optical Wavelength	λC	1270		1610	nm
LOS De ‑Assert	LOSD			‑17	dBm
LOS Assert	LOSA	‑30			dBm
LOS Hysteresis		0.5	1.0		dB