AFBR-57R5APZ

更新时间： 2024-02-18 07:29:58

品牌	Logo	应用领域
安华高科 - AVAGO		光纤
页数	文件大小	规格书
19页	288K
描述
Digital Diagnostic SFP, 850 nm, 4.25/2.125/1.0625 GBd, RoHS Compliant Optical Transceiver

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AFBR-57R5APZ 技术参数

是否Rohs认证：	符合	生命周期：	Active
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8517.62.00.50	风险等级：	2.27
其他特性：	MSA-SFF-8472	主体宽度：	13.4 mm
主体高度：	8.5 mm	主体长度或直径：	55.3 mm
内置特性：	AMPLIFIER	通信标准：	GBE
连接类型：	LC CONNECTOR	数据速率（接收）：	4250 Mbps
数据速率（发送）：	4250 Mbps	发射极/检测器类型：	LASER DIODE, PIN PHOTODIODE
光纤设备类型：	TRANSCEIVER	光纤类型：	50/125, 62.5/125, MMF
JESD-609代码：	e4	安装特点：	BOARD/PANEL MOUNT
最大工作波长：	860 nm	最小工作波长：	830 nm
标称工作波长：	850 nm	标称光功率输出：	0.125 mW
最小回损：	12 dB	最大供电电压：	3.63 V
最小供电电压：	2.97 V	标称供电电压：	3.3 V
表面贴装：	NO	端子面层：	Gold (Au)
Base Number Matches：	1

AFBR-57R5APZ 数据手册

OPTICAL INTERFACE

LIGHT FROM FIBER

ELECTRICAL INTERFACE

RECEIVER

RD+ (RECEIVE DATA)

RD– (RECEIVE DATA)

Rx LOSS OF SIGNAL

AMPLIFICATION

& QUANTIZATION

PHOTO-DETECTOR

MOD-DEF2 (SDA)

CONTROLLER & MEMORY

MOD-DEF1 (SCL)

MOD-DEF0

TRANSMITTER

TX_DISABLE

LASER

TD+ (TRANSMIT DATA)

TD– (TRANSMIT DATA)

TX_FAULT

DRIVER &

SAFETY

LIGHT TO FIBER

VCSEL

CIRCUITRY

Figure 1. Transceiver functional diagram.

Transmitter Section

Transmit Fault (Tx_Fault)

The transmitter section includes consists of the Transmit-

ter Optical SubAssembly (TOSA) and laser driver circuitry.

The TOSA, containing an 850 nm VCSEL (Vertical Cavity

Surface Emitting Laser) light source, is located at the

optical interface and mates with the LC optical connector.

The TOSA is driven by a custom IC which uses the

incoming diﬀerential high speed logic signal to modulate

the laser diode driver current. This Tx laser driver circuit

regulates the optical power at a constant level provided

the incoming data pattern is dc balanced (8B/10B code,

for example).

A catastrophic laser fault will activate the transmitter

signal, TX_FAULT, and disable the laser. This signal is

an open collector output (pull-up required on the host

board). A low signal indicates normal laser operation

and a high signal indicates a fault. The TX_FAULT will

be latched high when a laser fault occurs and is cleared

by toggling the TX_DISABLE input or power cycling the

transceiver. The transmitter fault condition can also be

monitored via the two-wire serial interface (address A2,

byte 110, bit 2).

Eye Safety Circuit

Transmit Disable (Tx_Disable)

The AFBR-57R5APZ provides Class 1 (single fault tolerant)

eye safety by design and has been tested for compliance

with the requirements listed in Table 1. The eye safety

circuit continuously monitors the optical output power

level and will disable the transmitter upon detecting an

unsafe condition beyond the scope of Class 1 certiﬁca-

tion. Such unsafe conditions can be due to inputs from

the host board (Vcc ﬂuctuation, unbalanced code) or a

fault within the transceiver.

The AFBR-57R5APZ accepts a TTL and CMOS compat-

ible transmit disable control signal input (pin 3) which

shuts down the transmitter optical output. A high signal

implements this function while a low signal allows

normal transceiver operation. In the event of a fault (e.g.

eye safety circuit activated), cycling this control signal

resets the module as depicted in Figure 4. An internal

pull up resistor disables the transceiver transmitter until

the host pulls the input low. Host systems should allow

a 10 ms interval between successive assertions of this

control signal. Tx_Disable can also be asserted via the

two-wire serial interface (address A2h, byte 110, bit 6)

and monitored (address A2h, byte 110, bit 7).

Receiver Section

The receiver section includes the Receiver Optical Sub-

Assembly (ROSA) and the ampliﬁcation/quantization

circuitry. The ROSA, containing a PIN photodiode and

custom transimpedance amplifier, is located at the

optical interface and mates with the LC optical connector.

The ROSA output is fed to a custom IC that provides post-

ampliﬁcation and quantization.

The contents of A2h, byte 110, bit 6 are logic OR’d with

hardware Tx_Disable (pin 3) to control transmitter

operation.

1 234 5 6 7...19

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