Avago HFBR-57E5APZ以太网SFP光收发方案

Avago 公司的HFBR-57E5APZ是125MBd SFP光收发器,具有SFF-8074i所规定的SFP接口,并和光收发器数字诊断接口SFF-8472兼容,能提供关于温度,LED偏压电流,LED平均输出电流和接收器平均输入功率的实时信息. HFBR-57E5APZ能和50/125um与62.5/125 um多模光纤工作,和100Base-FX version of IEEE802.3u兼容,单电源3.3V工作,+3.3V TTL CMOS输出,主要用在工厂自动化块速以太网,多模光纤的快速以太网.本文介绍了HFBR-57E5APZ主要特性, 收发器功能方框图, 连接电路图和MSA 所需电源滤波器电路图.

125MBd SFP Transceiver for Fast Ethernet and FDDI Application with DMI Feature, Bail de-latch, Ext Temp (-40 to 85C), RoHS Compliant

The HFBR-57E5APZ Small Form-Factor Pluggable LC transceiver gives the system designer a product to implement FDDI and Fast Ethernet networks with DMI. As an enhancement to the conventional SFP interface defined in SFF-8074i, the HFBR-57E5APZ is compatible
to SFF-8472 (digital diagnostic interface for optical transceivers). Using the 2-wire serial interface defined in the SFF-8472 MSA, the HFBR-57E5APZ provides real-time information on temperature, LED bias current, LED average output power and receiver average input power.

The interface also adds the ability to monitor the Receiver Loss of Signal (RX_LOS).

Transmitter

The transmitter contains a 1310 nm InGaAsP LED. The LED is packaged in the optical subassembly of the transmitter.

It is driven by an integrated circuit which converts differential PECL logic signals into an analog LED drive current. This current is monitored by the digital diagnostic interface. The transmitter light output power is inferred from this information.

Receiver

The receiver utilizes an InGaAs PIN photodiode coupled to a transimpedance preamplifier IC. It is packaged in the optical subassembly of the receiver. The PIN/preamplifier combination is connected to a quantizer IC which provides the final pulse shaping for data output. The data output is differential LVPECL. The quantizer IC has a loss of signal (LOS) detection circuit and has an open collector logic high output signal in the absence of a usable input optical signal. This LOS output is +3.3 V TTL as per SFF-8074i.

The PIN photodiode average current is monitored by the digital diagnostic interface as a measure for input optical power.

HFBR-57E5APZ主要特性:

__ RoHS compliant

__ Lead free

__ Industry Standard Small Form Pluggable (SFP) package

__ LC duplex connector optical interface

__ Operates with 50/125um and 62.5/125 um multimode fiber

__ Compatible with 100Base-FX version of IEEE802.3u

__ Single +3.3 V power supply

__ +3.3 V TTL LOS output

__ Receiver outputs are squelch enabled

__ Manufactured in an ISO 9001 certified facility

__ -40°C to 85℃ temperature range

__ Bail de-latch

__ Hot plug capability

HFBR-57E5APZ应用:

__ Factory automation at Fast Ethernet speeds

__ Fast Ethernet networking over multimode fiber.



图1.HFBR-57E5APZ收发器功能方框图

图2.HFBR-57E5APZ推荐的连接电路图

图3.MSA 所需电源滤波器