Ascent Communication Technology

2.5G SFP CWDM 40 km

ASCENT SFP-2G-LP-CXX-40 Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the CWDM XXnm DFB laser and the PIN photo-detector .The module data link up to 40KM in 9/125um single mode fiber.

• Up to 2.7 Gbps data links

• DFB laser transmitter and PIN photo-detector

• Up to 40 km on 9/125 µm SMF

• Hot-pluggable SFP footprint

• Duplex LC/UPC type pluggable optical interface

• Low power dissipation

• Metal enclosure for lower EMI

• RoHS compliant and lead-free

• Single +3.3 V power supply

• Supports Digital Diagnostic Monitoring interface

• Compliant with SFF-8472

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	‑40		85	°C
Relative Humidity	RH	5		95	%
Power Supply Voltage	V_CC	‑0.5		4	V
Signal Input Voltage		‑0.3		Vcc+0.3	V
Receiver Damage Threshold		5			dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	T_case	0		70	°C	Commercial
Case Operating Temperature	T_case	‑40		85	°C	Industrial
Power Supply Voltage	V_CC	3.13	3.3	3.47	V
Power Supply Current	I_CC			300	mA
Power Supply Noise Rejection				100	mVp‑p	100 Hz to 1 MHz
Data Rate			2500/2500	2700	Mbps	TX Rate/RX Rate
Transmission Distance				40	km
Coupled Fiber	Single‑mode fiber					9/125 µm SMF

Specification of Transmitter

Parameter		Symbol	Min.	Typ.	Max.	Unit	Note
Average Output Power		P_OUT	‑2		3	dBm	Note (1)
Extinction Ratio		ER	8.2			dB
Center Wavelength		λ_C	(1XX0)‑∆λ	1XX0	(1XX0)+∆λ	nm	DFB Laser Note (2)
Side Mode Suppression Ratio		SMSR	30			dB
Spectrum Bandwidth (‑20 dB)		σ			1	nm
Transmitter OFF Output Power		P_OFF			‑45	dBm
Differential Line Input Impedance		RIN	90	100	110	Ω
Output Eye Mask	Compliant with G.957 (class 1 laser safety)						Note (3)

Notes:

1. Measure at 2^23‑1 NRZ PRBS pattern

2. “XX” is: 27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59 and 61; “∆λ” is 10

3. Transmitter eye mask definition

x₃‑ x₂	0.2
y₁	0.25
y₂	0.75
y₃	0.25
y₄	0.25

Receiver Specifications

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Input Optical Wavelength	λ_IN	1270		1610	nm	PIN‑TIA
Receiver Sensitivity	P_IN			‑19	dBm	Note (1)
Input Saturation Power (Overload)	P_SAT	0			dBm
LOS De‑assert	LOSD			‑20	dBm
LOS Assert	LOSA	‑35			dBm	Note (2)
LOS Hysteresis		0.5	2	6	dB

Notes:

1. Measured with Light source 1XX0 nm, ER=8.2dB; BER =<10^‑12 @PRBS=2^23‑1 NRZ , “XX” is: 27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59 and 61.

2. When LOS de‑asserted, the RX data+/‑ output is High‑level (fixed)

Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Total Supply Current	I_CC			A	mA	Note (1)
Transmitter Disable Input‑High	V_DISH	2		Vcc+0.3	V
Transmitter Disable Input‑Low	V_DISL	0		0.8	V
Transmitter Fault Input‑High	VTxFH	2		Vcc+0.3	V
Transmitter Fault Input‑Low	VTxFL	0		0.8	V
Receiver
Total Supply Current	I_CC			B	mA	Note (1)
LOSS Output Voltage‑High	V_LOSH	2		Vcc+0.3	V	LVTTL
LOSS Output Voltage‑Low	V_LOSL	0		0.8	V	LVTTL

Note:

1. A (TX) + B (RX) = 300 mA (Not including termination circuit)

Regulatory Compliance

Feature	Reference	Performance
Electrostatic Discharge (ESD)	IEC/EN 61000‑4‑2	Compatible with standards
Electromagnetic Interference (EMI)	FCC Part 15 Class B EN 55022 Class B (CISPR 22A)	Compatible with standards
Laser Eye Safety	FDA 21CFR 1040.10, 1040.11 IEC/EN 60825‑1, 2	Class 1 laser product
Component Recognition	IEC/EN 60950, UL	Compatible with standards
ROHS	2002/95/EC	Compatible with standards
EMC	EN61000‑3	Compatible with standards