Description

MTRA-3E30A is a high performance, cost effective modules, which is supporting Multi Rate 9.953-25.78Gbps, and transmission distance up to 10km on SM fiber. The transceiver consists of two sections: The transmitter section incorporates a 1310nm DFB Laser, a driver and a CDR. The receiver section consists of a PIN photodiode integrated with a transimpedance preamplifier (TIA), a Limitting Amplifier and CDR. The module is hot pluggable into the 20-pin connector. The high-speed electrical interface is base on low voltage logic, with nominal 100 Ohms differential impedance and AC coupled in the module.

The optical output can be disabled by LVTTL logic high-level input of TX_DIS. Transmit Fault (Tx_Fault) is provided to indicate that the module transmitter has detected a fault condition related to laser operation or safety. Loss of signal (RX_LOS) output is provided to indicate the loss of an input optical signal of receiver.  

A serial EEPROM in the transceiver allows the user to access transceiver monitoring and configuration data via the 2-wire SFP

Management Interface. Digital diagnostics function are available via a 2-wire serial interface, as specified in SFF-8472.

Features

l Up to 10KM transmission distance

l Support Multi Rate 9.953-25.78Gbps

l 1310nm DFB and PIN receiver

l SFI electrical interface

l 2-wire interface for integrated Digital Diagnostic  monitoring

l SFP+ MSA package with duplex LC connector

l H ot pluggable

l Very low EMI and excellent ESD protection

l +3.3V power supply

l Power consumption less than 1.5W

l Operating case temperature: 0~70°C

 Applications   

l 25Gbps Ethernet

Compliance   

l Compliant with IEEE 802.3-2012

l Compliant with FCC 47 CFR Part 15, Class B

l Compliant with MSA SFF-8472

l Compliant with MSA SFF-8431

Specification

Notes:

[1]Under CDR bypass mode, CPRI option 7 compatibility

[2] 1000 consecutive snapshots at typical rate and room temperature

[3] Measured with a 4.7k Ohm load pulled up to Vcc

Notes:

[1] Measured with 25.78125Gb/s, PRBS-31 NRZ, ER>4dB, 1260~1360nm, BER 5E-5

[2]Under CDR bypass mode, CPRI option 7 compatibility

Notes:

[1] Time from rising edge of TX Disable to when the optical output falls below 10% of nominal

[2] Time from falling edge of TX Disable to when the modulated optical output rises above 90% of nominal

[3] From power on or negation of TX Fault using TX Disable

[4] Time from fault to TX fault on

[5] Time TX Disable must be held high to reset TX_fault

[6] Time from LOS state to RX LOS assert

[7] Time from non-LOS state to RX LOS deassert.

[8] Time from rising or falling edge of Rate Select input until receiver bandwidth is in conformance with appropriate specification

Pin-out Definition

Pin Assignment

Notes:

[1] The module signal ground pins, VeeR and VeeT, shall be isolated from the module case.

[2] This pin is an open collector/drain output pin and shall be pulled up with 4.7k-10kohms to Host_Vcc on the host board. Pull ups can be connected to multiple power supplies, however the host board design shall ensure that no module pin has voltage exceeding module VccT/R + 0.5 V.

[3] This pin is an open collector/drain input pin and shall be pulled up with 4.7k-10kohms to VccT in the module.

[4] See SFF-8431 4.2 2-wire Electrical Specifications .

[5] This pin shall be pulled up with 4.7k-10kohms to Host_Vcc on the host board.

Block Diagram of Transceiver

Transmitter Section

The transmitter converts 25.78Gbit/s serial PECL or CML electrical data into serial optical data compliant with the 25G Ethernet.  An open collector compatible Transmit Disable (Tx_Dis) is provided.  A logic “1,” or no connection on this pin will disable the laser from transmitting.  A 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 Transmit Fault (Tx_Fault) is provided. TX_Fault is a module output contact that when 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 4.7-10 kΩ. TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP+ module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor. Per the requirements of performance, internal clock and data recovery circuits (CDR) are present on electrical input of this transceiver module.. 

Receiver Section

The receiver converts 25.78Gbit/s serial optical data into serial PECL/CML electrical data.  An open collector compatible 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 4.7-10 kΩ, or with an active termination. The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP+ 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 far end of the cable. Per the requirements of performance, internal clock and data recovery circuits (CDR) are present on electrical output of this transceiver module. 

TX Equalization Control

Tx input equalization control can be accessed through 2-wire serial interface at byte address 114(A2h). Tx input equalization control for 25GE is located at the upper 4 bits of byte 114 (A2h).

RX Emphasis Control

Rx output emphasis control can be accessed through 2-wire serial interface at byte address 115(A2h). Rx output emphasis control for 25GE is located at the upper 4 bits of byte 115 (A2h).

Recommended Interface Circuit

Figure3

Digital Diagnostic Memory Map

EEPROM Information (A0h)

Serial ID Memory Contents(A0h)

Ordering Information

Contact Information 

Wuhan Huagong Genuine Optics Technology Co., Ltd

Address: Science & Technology Region of HUST, Donghu High-Tech Zone

Wuhan, Hubei Province, 430223, China

l Tel: +86-27-87180102   

l Fax: +86-27-87180220    

Email: market@genuine-opto.com

Statement

HG Genuine possesses the authority for ultimate explanation of all information contained in this document, which is subject to change without prior notice. All the information was obtained in specific environments; and HG Genuine will not be responsible for verifying the products performance in customers’ operating environments, neither liable for the performance of users' products. All information contained is only for the users' reference and shall not be considered as warranted characteristics. HG Genuine will not be liable for damages arising directly or indirectly from any use of the information contained in this document.