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1.25G SFP SR 850 nm 550 m

ASCENT’s SFP-AG-LP-85-05 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 VCSEL laser and the PIN photo-detector. The module data link up to 550 m in 50/125 µm multi-mode fiber. The optical output can be disabled by a TTL logic high- level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

·       Up to 1.25 Gb/s data links with DDM

·       VCSEL laser transmitter and PIN photo-detector

·       Hot-pluggable SFP footprint

·       Duplex LC/UPC type pluggable optical interface

·       Low power consumption

·       Metal enclosure, for lower EMI

·       RoHS compliant and lead-free

·       Single +3.3V power supply

·       Compliant with SFF-8472

·       Link up to 550 m in 50/125 µm multi-mode fiber


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

‑0.5



Signal Input Voltage 


‑0.3


Vcc+0.3 


Receiver Damage Threshold 


+5



dBm 


Recommended Operating Conditions

Parameter 

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Case Operating Temperature

Tcase

0


70

°C 

SFP‑AG‑LP‑85‑05

‑40


85 

SFP‑AG‑LP‑85‑05A

Power Supply Voltage 

VCC

3.13

3.3 

3.47 


Power Supply Current 

ICC 



280

mA 


Power Supply Noise Rejection




100

mVp‑p

100 Hz to 1 MHz

Data Rate



1250/1250


Mbps

TX Rate/RX Rate

Transmission Distance




 550

M


Coupled Fiber

Multi‑mode fiber

50/125 µm MMF

Transmitter Specifications

Parameter 

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Average Output Power

POUT

‑9


‑3

dBm 

1

Extinction Ratio 

ER 

9



dB 


Center Wavelength 

λ

830

850

860

nm 

VCSEL Laser

Spectrum Bandwidth (RMS)

σ



0.85

nm

Transmitter OFF Output Power 

POff 



‑45

dBm 


Differential Line Input Impedance

RIN

90

100

110

Ω


Output Eye Mask 

Compliant with IEEE802.3 z (class 1 laser safety)

2

Notes

1. Measure at 2^7‑1 NRZ PRBS pattern 

2. Transmitter eye mask definition

                               image4.png

Receiver Specifications

Parameter 

Symbol 

Min. 

Typ. 

Max. 

Unit 

Note 

Input Optical Wavelength 

λIN 

770

850

860

nm 

PIN‑TIA

Receiver Sensitivity 

PIN 



‑17

dBm 

Input Saturation Power (Overload) 

PSAT

0



dBm 


Loss Of Signal Assert

PA



‑18

dBm 


Loss Of Signal De‑assert

PD

‑35



dBm 

LOS Hysteresis 

PA‑PD

 0.5 

dB 


Notes:

1. Measured with Light source 850nm, ER=9dB; BER =<10^‑12 @PRBS=2^7‑1 NRZ 

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 

ICC 



mA 

Transmitter Disable Input‑High 

VDISH

2


Vcc+0.3


Transmitter Disable Input‑Low

VDISL

0


0.8

V


Transmitter Fault Input‑High

VTxFH

2


Vcc+0.3

V


Transmitter Fault Input‑Low

VTxFL

0


0.8 


Receiver 

Total Supply Current 

ICC 



mA 

LOSS Output Voltage‑High

VLOSH

 2 


Vcc+0.3 

LVTTL 

LOSS Output Voltage‑Low

VLOSL

 0 


0.8 

Notes

1. A (TX) + B (RX) = 280mA (Not include 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

 


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