25Gb/s SFP28 SR Transceiver
P
RODUCT
N
UMBER
:
TAS-A1EH1-831
Specification
Small Form Factor Pluggable
Duplex LC Receptacle – SFP28
Optical Transceivers
Ordering Information
TAS–A1EH1–831
Model Name
TAS-A1EH1-831
Voltage
3.3V
Category
With DDMI
Device type
850 nm VSCEL
Interface
AC / AC
Coupling
LOS
PCML
Temperature
0°C~+70°C
Distance
70m/100m
OM3/OM4
Latch Color
Black
Formerica OptoElectronics Inc
.
5F-11, No.38, Taiyuan St.,Zhubei City ,
Hsinchu County 30265, Taiwan
Ph: +886 -3-5600286 Fax: +886 -3-5600239
www.formericaoe.com
Version 1.1
1
Page 1
25Gb/s SFP28 SR Transceiver
P
RODUCT
N
UMBER
:
TAS-A1EH1-831
Features
25Gb/s serial optical interface
850nm VCSEL transmitter, PIN photo- detector
2-wire interface for management specifications compliant with SFF 8472 digital
diagnostic monitoring interface for optical transceivers
Operating case temperature: 0 to 70°C
All-metal housing for superior EMI performance
Low power consumption
Advanced firmware allows customer system encryption information to be stored in
transceiver
Cost effective SFP28 solution, enables higher port densities and greater bandwidth
RoHS compliant
Applications
High-speed storage area networks
Computer cluster cross-connect
Custom high-speed data pipes
Inter Rack Connection
Fiber type
50μm MMF
850nm OFL Bandwidth
OM4
(3500 MHz-km)
Supported Distances (meters)
Up to 100
50μm MMF
OM3
(2000 MHz-km)
Up to 70
Formerica OptoElectronics Inc
.
5F-11, No.38, Taiyuan St.,Zhubei City ,
Hsinchu County 30265, Taiwan
Ph: +886 -3-5600286 Fax: +886 -3-5600239
www.formericaoe.com
Version 1.1
1
Page 2
25Gb/s SFP28 SR Transceiver
P
RODUCT
N
UMBER
:
TAS-A1EH1-831
General Description
The SFP28 SR module electrical interface is compliant to SFI electrical specifications. The
transmitter input and receiver output impedance is 100 Ohms differential. Data lines are
internally AC coupled. The module provides differential termination and reduce differential to
common mode conversion for quality signal termination and low EMI. SFI typically operates
over 200 mm of improved FR4 material or up to about 150mm of standard FR4 with one
connector.
The transmitter converts 25Gbit/s serial PECL or CML electrical data into serial optical data
compliant with the 25GBASE-SR standard. An open collector compatible with Transmit
Disable (Tx_Dis) is provided. Logic “1”or no connection on this pin will disable the laser from
transmitting. Logic “0” on this pin provides normal operation. The transmitter has an internal
automatic power control loop (APC) to ensure constant optical power output across supply
voltage and temperature variations. An open collector compatible with Transmit Fault
(Tx_Fault) is provided.
TX_Fault is a module output contact that when set to high, indicates that the module
transmitter has detected a fault condition related to laser operation or safety. The TX_Fault
output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host
with a resistor in the range of 4.7-10 kΩ. TX_Disable is a module input contact. When
TX_Disable is asserted high or left open, the SFP28 module transmitter output shall be turned
off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor
The receiver converts 25Gbit/s serial optical data into serial PECL/CML electrical data. An
open collector compatible with Loss of Signal is provided. Rx_LOS when high indicates an
optical signal level below that specified in the relevant standard. The Rx_LOS contact is an
open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in
the range of 4.7-10 kΩ, or with an active termination. Power supply filtering is recommended
for both the transmitter and receiver. The Rx_LOS signal is intended as a preliminary
indication to the system in which the SFP28 is installed that the received signal strength is
below the specified range. Such an indication typically points to non-installed cables, broken
cables, or a disabled, failing or a powered off transmitter at the other end of the cable.
Proposed Application Schematics
Formerica OptoElectronics Inc
.
5F-11, No.38, Taiyuan St.,Zhubei City ,
Hsinchu County 30265, Taiwan
Ph: +886 -3-5600286 Fax: +886 -3-5600239
www.formericaoe.com
Version 1.1
1
Page 3
25Gb/s SFP28 SR Transceiver
P
RODUCT
N
UMBER
:
TAS-A1EH1-831
Transceiver Block Diagram
Formerica OptoElectronics Inc
.
5F-11, No.38, Taiyuan St.,Zhubei City ,
Hsinchu County 30265, Taiwan
Ph: +886 -3-5600286 Fax: +886 -3-5600239
www.formericaoe.com
Version 1.1
1
Page 4
25Gb/s SFP28 SR Transceiver
P
RODUCT
N
UMBER
:
TAS-A1EH1-831
Pin Definition and Descriptions
Formerica OptoElectronics Inc
.
5F-11, No.38, Taiyuan St.,Zhubei City ,
Hsinchu County 30265, Taiwan
Ph: +886 -3-5600286 Fax: +886 -3-5600239
www.formericaoe.com
Version 1.1
1
Page 5
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