25Gb/s SFP28 CWDM 40km Transceiver

The 25Gb/s SFP28 CWDM 40km transceiver is a high-performance, cost-effective solution for 25G Ethernet, 5G fronthaul, and data center interconnects, offering long reach (40km) with CWDM wavelength efficiency.

Specification

Resources

Features

Up to 25.78Gb/s data links

Single +3.3V power supply

Class 1 laser safety certified

Hot-pluggable SFP footprint

Digital diagnostic capabilities

Up to 10km on 9/125um SMF

RoHS compliant and lead-free

CWDM DFB laser and PIN receiver

All-metal housing for superior EMI performance

Cost effective SFP28 solution, enables higher port densities and greater bandwidth

2-wire interface for management specifications compliant with SFF-8472 digital diagnostic monitoring interface for optical transceivers

Case operating temperature

Commercial: 0 ~ +70℃

Extended: -10 ~ +80℃

Industrial: -40 ~ +85℃

Applications

Inter Rack Connection

Custom high-speed data pipes

Computer cluster cross-connect

High-speed storage area networks

Wavelength List:

Wavelength	x	Clasp Color Code	Wavelength	x	Clasp Color Code
1270	6	Gray	1330	8	Purple
1290	7	Gray	1350	9	Blue
1310	3	Gray	1370	A	Green

Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter	Symbol	Min	Max	Unit	Notes
Storage Temperature	TS	-40	85	oC
Power Supply Voltage	VCC	-0.5	3.6	V
Relative Humidity (non-condensation)	RH	5	95	%
Damage Threshold	THd	-3		dBm

Recommended Operating Conditions and Power Supply Requirements

Parameter	Symbol	Min	Typical	Max	Unit	Notes
Operating Case Temperature	TOP	0		70	oC	commercial
		-10		80		Extended
		-40		85		Industrial
Power Supply Voltage	VCC	3.135	3.3	3.465	V
Data Rate			25.78		Gb/s
Control Input Voltage High		2		Vcc	V
Control Input Voltage Low		0		0.8	V
Link Distance (SMF)	D			40	km	9/125um

Pin Assignment and Pin Description

Figure1. Diagram of host board connector block pin numbers and names

PIN	Name	Name/Description	Notes
1	VeeT	Transmitter Ground	1
2	TX_Fault	Transmitter Fault
3	TX_Disable	Transmitter Disable; Turns off transmitter laser output
4	SDA	Two wire serial interface Data Line (LVCMOS-I/O) (MOD-DEF2)	2
5	SCL	Two wire serial interface Clock Line (LVCMOS-I/O) (MOD-DEF1)	2
6	MOD_ABS	Module Definition, Grounded in the module
7	RS0	Rx Rate Select:
8	RX_LOS	Receiver Loss of Signal Indication Active LOW
9	RS1	Transmitter Rate Select (not used)
10	VeeR	Receiver Ground	1
11	VeeR	Receiver Ground	1
12	RD-	Receiver Inverted Data Output
13	RD+	Receiver Data Output
14	VeeR	Receiver Ground	1
15	VccR	Receiver Power - +3.3V
16	VccT	Transmitter Power - +3.3 V
17	VeeT	Transmitter Ground	1
18	TD+	Transmitter Non-Inverted Data Input
19	TD-	Transmitter Inverted Data Input
20	VeeT	Transmitter Ground	1

Notes:

1. Module ground pins GND are isolated from the module case.

2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.47V on the host board.

Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter	Symbol	Min.	Typ.	Max	Unit	Notes
Power Consumption	p			1.75	W
Supply Current	Icc			520	mA
Transmitter
Single-ended Input Voltage Tolerance	Vcc	-0.3		4.0	V
Common mode voltage tolerance		15			mV
Differential Input Voltage Swing	Vin,pp	180		700	mVpp
Differential Input Impedance	Zin	90	100	110	Ohm	1
Transmit Disable Assert Time				10	us
Transmit Disable Voltage	Vdis	Vcc-1.3		Vcc	V
Transmit Enable Voltage	Ven	Vee		Vee +0.8	V	2
Receiver
Single-ended Input Voltage Tolerance	Vcc	-0.3		4.0	V
Differential Output Voltage Swing	Vout,pp	300		900	mVpp
Differential Output Impedance	Zout	90	100	110	Ohm	3
Data output rise/fall time	Tr/Tf	9.5			ps	4
LOS Assert Voltage	VlosH	Vcc-1.3		Vcc	V	5
LOS De-assert Voltage	VlosL	Vee		Vee +0.8	V	5

Notes:

1. Connected directly to TX data input pins. AC coupled thereafter.

2. Or open circuit.

3. Input 100 ohms differential termination.

4. These are unfiltered 20-80% values.

5. Loss of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.

Optical Characteristics

The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter	Symbol	Min.	Typical	Max	Unit	Notes
Transmitter
Center Wavelength	λC	λ -6.5		λ +6.5	nm
Optical Spectral Width	∆λ			1	nm
Average Optical Power	PAVG	0		5	dBm	1
Side Mode Suppression Ratio	SMSR	20			dB
Optical Extinction Ratio	ER	3.5			dB
Transmitter OFF Output Power	Poff			-30	dBm
Transmitter and Dispersion Penalty	TDP			2.7	dB
Optical Return Loss Tolerance	ORLT			20	dB
Transmitter Eye Mask	Compliant with IEEE802.3ae
Receiver
Center Wavelength	λC	1270		1610	nm
Receiver Sensitivity (OMA)	Sen.			-14	dBm	2
Average Receive Power		-20		-5	dBm
Input Saturation Power (overload)	Psat	-8			dBm
LOS Assert	LOSA	-30			dBm
LOS De-assert	LOSD			-21	dBm
Damage Threshold	THd	-3			dBm
LOS Hysteresis	LOSH	0.5			dB

Notes:

1. Class 1 Laser Safety per FDA/CDRH and IEC-825-1 regulations.

2. Measured with Light source 1310nm, ER=3.5dB; BER =<10^-12 @ PRBS=2^31-1 NRZ.

Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified. It is compliant to SFF-8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales staff.

Parameter	Symbol	Min.	Max	Unit	Notes
Temperature monitor absolute error	DMI_ Temp	-3	3	℃	Over operating temp
Supply voltage monitor absolute error	DMI _VCC	-0.15	0.15	V	Full operating range
RX power monitor absolute error	DMI_RX	-3	3	dB
Bias current monitor	DMI_ bias	-10%	10%	mA
TX power monitor absolute error	DMI_TX	-3	3	dB

Mechanical Dimensions

Figure2. Mechanical Outline

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Resources

25Gb/s SFP28 CWDM 40km Transceiver