Description

The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 550m transmission distance with MMF.

 

The transceiver consists of three sections: a VCSEL laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.

 

The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA. Functional Diagram

 

 

 

 

 

 

Ordering information

Data Rate (Mbps)	Media	Wavelength (nm)	Transmission Distance(km)	Temperature Range （Tcase）（℃）
1250	Multi mode fiber	850	<2	0~70	commercial
1250	Multi mode fiber	850	<2	-10~80	extended
1250	Multi mode fiber	850	<2	-45~85	industrial

 

Absolute Maximum Ratings

Note: Stress in excess of the maximum absolute ratings can cause permanent damage to the module.

General Operating Characteristics

 

Electrical Input/Output Characteristics

● Transmitter

 

● Receiver

Parameter		Symbol	Min.	Typ.	Max.	Unit	Notes
Diff. Output Voltage Swing			400		1o00	mVpp	3
Rx LOS Output	H	VOH	2.0		Vcc+0.3	V	2
	L	VOL	0		0.8

Note 1) TD+/- are internally AC coupled with 100Ω differential termination inside the module.

Note 2) Tx Fault and Rx LOS are open collector outputs, which should be pulled up with 4.7k to 10kΩ resistors on the host board. Pull up voltage between 2.0V and Vcc+0.3V.

Note 3) RD+/- outputs are internally AC coupled, and should be terminated with 100Ω (differential) at the user SERDES.

 

Optical Characteristics

● Transmitter

Parameter	Symbol	Min.	Type	Max.	Unit	Notes
Ave. Output Power (Enable)	Po	-11		1	dBm	1
Total Jitter	1.25G			0.431	UI
Extinction Ratio	ER	9			dB	1
Rise/Fall Time (20%-80%)	Tr-Tf			0.26	ns	2
Wavelength Range		840	850	860	nm
Spectral Width (RMS)				0.65	nm
Output Optical Eye	Compliant with  IEEE802.3 z (class 1 laser safety)

● Receiver

Parameter	Symbol	Min.	Type	Max.	Unit	Notes
Operating Wavelength		770		860	nm
Sensitivity	Pimin			-18	dBm	3
Min. Overload	Pimax	0			dBm	3
Total Jitter	1.25G			0.749	UI
LOS Assert	Pa	-35			dBm
LOS De-assert	Pd			-19	dBm
LOS Hysteresis	Pd-Pa	0.5		6	dB

Note 1) Measured at 1250 Mb/s with PRBS 2⁷ – 1 NRZ test pattern.

Note 2) Unfiltered, measured with a PRBS 2⁷-1 test pattern @1.25Gbps

Note 3) Measured at 1250 Mb/s with PRBS 2⁷ – 1 NRZ test pattern for BER < 1x10^-12

 

Pin Definitions and Functions

 

 

 

 

 

 

 

 

 

PIN #	Name	Function	Notes
1	VeeT	Tx ground
2	Tx Fault	Tx fault indication, Open Collector Output, active “H”	Note 1
3	Tx Disable	LVTTL Input, internal pull-up, Tx disabled on “H”	Note 2
4	MOD-DEF2	2 wire serial interface data input/output (SDA)	Note 3
5	MOD-DEF1	2 wire serial interface clock input (SCL)	Note 3
6	MOD-DEF0	Model present indication	Note 3
7	Rate select	No connection
8	LOS	Rx loss of signal, Open Collector Output, active “H”	Note 4
9	VeeR	Rx ground
10	VeeR	Rx ground
11	VeeR	Rx ground
12	RD-	Inverse received data out	Note 5
13	RD+	Received data out	Note 5
14	VeeR	Rx ground
15	VccR	Rx power supply
16	VccT	Tx power supply
17	VeeT	Tx ground
18	TD+	Transmit data in	Note 6
19	TD-	Inverse transmit data in	Note 6
20	VeeT	Tx ground

 

Note 1) When high, this output indicates a laser fault of some kind. Low indicates normal operation. And should be pulled up with a 4.7 – 10KΩ resistor on the host board.

Note 2) TX disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7 – 10KΩ resistor. Its states are:

  Low (0 – 0.8V): Transmitter on               (>0.8, < 2.0V): Undefined

  High (2.0V~Vcc+0.3V): Transmitter Disabled   Open: Transmitter Disabled

 

Note 3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7K – 10KΩ resistor on the host board. The pull-up voltage shall be between 2.0V~Vcc+0.3V.

       Mod-Def 0 has been grounded by the module to indicate that the module is present

       Mod-Def 1 is the clock line of two wire serial interface for serial ID

       Mod-Def 2 is the data line of two wire serial interface for serial ID

 

Note 4) When high, this output indicates loss of signal (LOS). Low indicates normal operation.

 

Note 5) RD+/-: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which should be terminated with 100Ω (differential) at the user SERDES. The AC coupling is done inside the module and is thus not required on the host board.

 

Note 6) TD+/-: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω differential termination inside the module. The AC coupling is done inside the module and is thus not required on the host board.

 

Diagnostics

Diagnostics Specification

Parameter	Range	Unit	Accuracy	Calibration
Temperature	0 to +70  -40 to +85	°C	±3°C	Internal/ External
Voltage	3.0 to 3.6	V	±3%	Internal/ External
Bias Current	2 to 15	mA	±10%	Internal/ External
TX Power	-13 to 1	dBm	±3dB	Internal/ External
RX Power	-21 to 0	dBm	±3dB	Internal/ External

Typical Interface Circuit

 

 

 

 

 

 

 

Package Dimensions

 

 

Ordering Information & Related Products

Dual Fiber SFP, 1.25Gbps, 850nm, 550M, without DDM

Dual Fiber SFP, 1.25Gbps, 850nm, 550M, with DDM