AVAGO AFBR-57J7APZ Service Manual
AFBR-57J7APZ
Digital Diagnostic SFP, 850nm 6.144/7.3728 Gb/s,
RoHS OBSAI/CPRI Compatible Optical Transceiver
Data Sheet
Description
Avago’s AFBR-57J7APZ optical transceiver supports
high speed serial links over multimode optical ber at
signaling rates up to 7.4 Gb/s for wireless base station applications involving the OBSAI or CPRI protocols, as well
as related applications. The transceiver is compliant with
Small Form Pluggable (SFP) multi-source agreements INF8074 and SFF-8472 for mechanical and electrical specications and FOCIS/IEC specications for optical duplex LC
connectors.
As an enhancement to the conventional SFP interfaced
dened in INF-8074, the AFBR-57J7APZ is compliant to
SFF-8472 (Digital Diagnostic Interface for Optical Transceivers). Using the 2-wire serial interface dened in SFF8472, the transceiver provides real time temperature,
supply voltage, laser bias current, laser average output
power and received input power. This information is in
addition to conventional SFP base data. The digital diagnostic interface also adds the ability to disable the transmitter and monitor the status of transmitter fault and
receiver loss of signal.
Related Products
• AFBR-57J5APZ: 850nm +3.3V LC SFP
for CPRI/OBSAI Applications
• AFCT-57J5APZ: 1310nm +3.3V LC SFP
for CPRI/OBSAI Applications
• AFCT-57J5ATPZ: 1310nm +3.3V LC SFP
for CPRI/OBSAI Applications
• AFBR-57D7APZ: 850nm +3.3V LC SFP
for 8.5/4.25/2.125 GBd Fibre Channel
• AFCT-57D5ATPZ: 1310nm +3.3V LC SFP
for 8.5/4.25/2.125 GBd Fibre Channel
• AFCT-57J7ATPZ: 1310nm +3.3V LC SFP
for CPRI/OBSAI Applications
Features
• Fully RoHS Compliant
• Diagnostic Features Per SFF-8472 “Diagnostic
Monitoring Interface for Optical Transceivers”
• Real time monitors of:
o Transmitted Optical Power
o Received Optical Power
o Laser Bias Current
o Temperature
o Supply Voltage
• Industrial Temperature and Supply Voltage Operation
(-40°C to 85°C) (3.3V ± 10%)
• Transceiver Specications per SFP (INF-8074) and SFF-
8472 (revision 10)
• Up to 200m with 50μm OM3 for 7.3728 Gb/s
• Up to 300m with 50μm OM3 for OBSAI 6.144 Gb/s
• LC Duplex optical connector interface conforming to
ANSI TIA/EIA604-10 (FOCIS 10A)
• 850nm Vertical Cavity Surface Emitting Laser (VCSEL)
Source Technology
• IEC 60825-1 Class 1/CDRH Class 1 laser eye safe
• Compatible with Fibre Channel and Gigabit Ethernet
applications
Applications
Wireless and cellular base station system interconnect
OBSAI rates 6.144 Gb/s, 3.072 Gb/s, 1.536 Gb/s
CPRI rates 7.3728 Gb/s, 4.9152 Gb/s, 2.4576 Gb/s,
1.2288 Gb/s
Digital Diagnostic Interface and Serial Identication
EEPROM
CONTROLLER
EEPROM
Photo-Detector
Amplification
&
Quantization
VCSEL
Laser Driver &
Safety Circuit
Electrical Interface
RD+ (Receive Data)
RD- (Receive Data)
Rx Loss Of Signal
MOD-DEF2 (SDA)
TX_DISABLE
TD+ (Transmit Data)
TD- (Transmit Data)
TX_FAULT
MOD-DEF0
MOD-DEF1 (SCL)
Receiver
Transmitter
Optical Interface
Light from Fiber
Light to Fiber
Rate Select
The 2-wire serial interface is based on ATMEL AT24C01A
series EEPROM protocol and signaling detail. Conventional EEPROM memory, bytes 0-255 at memory address
0xA0, is organized in compliance with INF-8074. New
digital diagnostic information, bytes 0-255 at memory
address 0xA2, is compliant to SFF-8472. The new diagnostic information provides the opportunity for Predictive Failure Identication, Compliance Prediction, Fault
Isolation and Component Monitoring.
Transmitter Section
The transmitter section includes consists of the Transmitter Optical SubAssembly (TOSA) and laser driver circuitry.
The TOSA, containing an 850nm 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 dierential 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).
Transmit Disable (Tx_Disable)
The AFBR-57J7APZ accepts a TTL and CMOS compatible
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 10ms
interval between successive assertions of this control
signal. Tx_Disable can also be asserted via the twowire serial interface (address A2h, byte 110, bit 6) and
monitored (address A2h, byte 110, bit 7).
The contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter
operation..
Transmit Fault (Tx_Fault)
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
The AFBR-57J7APZ 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 certication. Such unsafe conditions can be due to inputs from
the host board (Vcc uctuation, unbalanced code) or a
fault within the transceiver.
Receiver Section
The receiver section includes the Receiver Optical SubAssembly (ROSA) and the amplication/quantization
circuitry. The ROSA, containing a PIN photodiode and
custom transimpedance amplier, is located at the
optical interface and mates with the LC optical connector.
The ROSA output is fed to a custom IC that provides postamplication and quantization.
Figure 1. Transceiver Functional Diagram
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Receiver Loss of Signal (Rx_LOS)
The post-amplication IC also includes transition
detection circuitry which monitors the ac level of
incoming optical signals and provides a TTL/CMOS compatible status signal to the host (pin 8). An adequate
optical input results in a low Rx_LOS output while a high
Rx_LOS output indicates an unusable optical input. The
Rx_LOS thresholds are factory set so that a high output
indicates a denite optical fault has occurred. Rx_LOS
can also be monitored via the two-wire serial interface
(address A2h, byte 110, bit 1).
Functional Data I/O
The AFBR-57J7APZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector) identied by function in Table 2. The board layout for this
interface is depicted in Figure 6.
The AFBR-57J7APZ high speed transmit and receive interfaces require SFP MSA, OBSAI or CPRI compliant signal
lines on the host board. To simplify board requirements,
biasing resistors and ac coupling capacitors are incorporated into the SFP transceiver module (per INF-8074) and
hence are not required on the host board. The Tx_Disable,
Tx_Fault, Rx_LOS and Rate_Select lines require TTL lines
on the host board (per INF-8074) if used. If an application
chooses not to take advantage of the functionality of
these pins care must be taken to ground Tx_Disable (for
normal operation) and Rate_Select is set to default in the
proper state.
Figure 2 depicts the recommended interface circuit to
link the AFBR-57J7APZ to supporting physical layer ICs.
Timing for MSA compliant control signals implemented
in the transceiver are listed in Figure 4.
Application Support
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFBR-57J7APZ . Please contact
your local Field Sales representative for availability and
ordering details.
Caution
There are no user serviceable parts nor maintenance requirements for the AFBR-57J7APZ. All mechanical adjustments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improperly
handling the AFBR-57J7APZ will void the product
warranty. It may also result in improper operation and
possibly overstress the laser source. Performance degradation or device failure may result. Connection of the
AFBR-57J7APZ to a light source not compliant with these
specications, operating above maximum operating
conditions or in a manner inconsistent with it’s design
and function may result in exposure to hazardous light
radiation and may constitute an act of modifying or man-
ufacturing a laser product. Persons performing such an
act are required by law to re-certify and re-identify the
laser product under the provisions of U.S. 21 CFR (Subchapter J) and TUV.
Ordering Information
Please contact your local eld sales engineer or one of
Avago Technologies franchised distributors for ordering
information. For technical information, please visit Avago
Technologies’ WEB page at www.Avago.com or contact
Avago Technologies Semiconductor Products Customer
Response Center at 1-800-235-0312. For information
related to SFF Committee documentation visit www.scommittee.org.
Regulatory Compliance
The AFBR-57J7APZ complies with all applicable laws
and regulations as detailed in Table 1. Certication level
is dependent on the overall conguration of the host
equipment. The transceiver performance is oered as a
gure of merit to assist the designer
Electrostatic Discharge (ESD)
The AFBR-57J7APZ is compatible with ESD levels found
in typical manufacturing and operating environments
as described in Table 1. In the normal handling and
operation of optical transceivers, ESD is of concern in two
circumstances.
The rst case is during handling of the transceiver prior
to insertion into an SFP compliant cage. To protect the
device, it’s important to use normal ESD handling precautions. These include using of grounded wrist straps, workbenches and oor wherever a transceiver is handled.
The second case to consider is static discharges to the
exterior of the host equipment chassis after installation.
If the optical interface is exposed to the exterior of host
equipment cabinet, the transceiver may be subject to
system level ESD requirements.
Electromagnetic Interference (EMI)
Equipment incorporating gigabit transceivers is typically
subject to regulation by the FCC in the United States,
CENELEC EN55022 (CISPR 22) in Europe and VCCI
in Japan. The AFBR-57J7APZ’s compliance to these
standards is detailed in Table 1. The metal housing and
shielded design of the AFBR-57J7APZ minimizes the EMI
challenge facing the equipment designer.
EMI Immunity (Susceptibility)
Due to its shielded design, the EMI immunity of the AFBR57J7APZ exceeds typical industry standards.
3
Flammability
BAUART
GEPRUFT
TYPE
APPROVED
TUV
Rheinland
Product Safety
¨
¨
The AFBR-57J7APZ optical transceiver is made of metal
and high strength, heat resistant, chemical resistant and
UL 94V-0 ame retardant plastic.
plant and remote transmitter. When operating out of requirements, the link cannot guarantee error free transmission.
Predictive Failure Identication
The AFBR-57J7APZ predictive failure feature allows a host
to identify potential link problems before system performance is impacted. Prior identication of link problems
enables a host to service an application via “fail over”
to a redundant link or replace a suspect device, maintaining system uptime in the process. For applications
where ultra-high system uptime is required, a digital SFP
provides a means to monitor two real-time laser metrics
associated with observing laser degradation and predicting failure: average laser bias current (Tx_Bias) and
Fault Isolation
The fault isolation feature allows a host to quickly
pinpoint the location of a link failure, minimizing
downtime. For optical links, the ability to identify a fault
at a local device, remote device or cable plant is crucial to
speeding service of an installation. AFBR-57J7APZ realtime monitors of Tx_Bias, Tx_Power, Vcc, Temperature and
Rx_Power can be used to assess local transceiver current
operating conditions. In addition, status ags Tx_Disable
and Rx Loss of Signal (LOS) are mirrored in memory and
available via the two-wire serial interface.
average laser optical power (Tx_Power).
Component Monitoring
Compliance Prediction:
Compliance prediction is the ability to determine if an
optical transceiver is operating within its operating and
environmental requirements. AFBR-57J7APZ devices
provide real-time access to transceiver internal supply
voltage and temperature, allowing a host to identify
potential component compliance issues. Received optical
power is also available to assess compliance of a cable
Table 1. Regulatory Compliance
Feature Test Method Performance
Electrostatic Discharge
(ESD) to the Electrical Pins
Electrostatic Discharge
(ESD) to the Duplex LC
Receptacle
Electrostatic Discharge
(ESD) to the Optical
Connector
Electromagnetic
Interference (EMI)
Immunity Variation of IEC 61000-4-3 Typically shows no measurable eect from a
Laser Eye Safety
and Equipment Type
Testing
Component Recognition Underwriters Laboratories and Canadian Standards
MIL-STD-883C Method 3015.4 Class 1 (> 2000 Volts)
Variation of IEC 61000-4-2 Typically, no damage occurs with 25 kV
GR1089 10 contacts of 8 KV on the electrical faceplate
Variation of IEC 801-2 Air discharge of 15kV(min) contact to
FCC Class B
CENELEC EN55022 Class B
(CISPR 22A)
VCCI Class 1
US FDA CDRH AEL Class 1
US21 CFR, Subchapter J per Paragraphs 1002.10
and 1002.12.
(IEC) EN60825-1: 1994 + A11+A2
(IEC) EN60825-2: 1994 + A1
(IEC) EN60950: 1992 + A1 + A2 + A3+ A4 + A11
Association Joint Component Recognition for
Information Technology Equipment Including
Electrical Business Equipment
Component evaluation is a more casual use of the
AFBR-57J7APZ real-time monitors of Tx_Bias, Tx_Power,
Vcc, Temperature and Rx_Power. Potential uses are as
debugging aids for system installation and design, and
transceiver parametric evaluation for factory or eld qualication. For example, temperature per module can be
observed in high density applications to facilitate thermal
evaluation of blades, PCI cards and systems.
when the duplex LC connector receptacle is
contacted by a Human Body Model probe.
with device inserted into a panel.
connector w/o damage
System margins are dependent on customer
board and chassis design.
10V/m eld swept from 10 MHz to 1 GHz.
CDRH certication # 9720151-072
TUV le # 72071411
UL File # E173874
4
LASER DRIVER
MODULE DETECT
LOSS OF SIGNAL
SCL
SDA
Tx_FAULT
Tx_DISABLE
TD+
Tx FAULT
Tx DIS
TD–
RD+
RD–
MOD_DEF2
MOD_DEF1
MOD_DEF0
GND,R
4.7 k to
10 kΩ
50 Ω
50 Ω
4.7 k to 10 kΩ4.7 k to 10 kΩ
PROTOCOL IC
VCC,T
VCC,T
VCC,R
1 µH
1 µ H
10µF 0.1µF
0.1 µF
10µF 0.1µF
3.3 V
3.3 V
SERDES IC
Rx LOS
GND,T
0.01 µ F
0.01 µ F
POST AMPLIFIER
100 Ω
4.7 k to 10 kΩ
100 Ω
6.8 kΩ
0.01 µ F
VCC,R
0.01 µ F
4.7 k to 10 kΩ
VCC,R
1 µH
1 µH
0.1 µF
VCCR
SFP MODULE
10 µF
VCCT
0.1 µF 10 µF
3.3 V
HOST BOARD
0.1 µF
NOTE: INDUCTORS MUST HAVE LESS THAN 1 Ω SERIES RESISTANCE TO LIMIT VOLTAGE DROP TO THE SFP MODULE.
Figure 2. Typical Application Conguration
Figure 3. Recommended Power Supply Filter
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Table 2. Pin Description
Pin Name Function/Description Notes
1 VeeT Transmitter Ground
2 TX_FAULT Transmitter Fault Indication – High indicates a fault condition Note 1
3 TX_DISABLE Transmitter Disable – Module optical output disables on high or open Note 2
4 MOD-DEF2 Module Denition 2 – Two wire serial ID interface data line (SDA) Note 3
5 MOD-DEF1 Module Denition 1 – Two wire serial ID interface clock line (SCL) Note 3
6 MOD-DEF0 Module Denition 0 – Grounded in module (module present indicator) Note 3
7 no connect Internal pullup 30KW to Vcc
8 RX_LOS Loss of Signal – High indicates loss of received optical signal Note 4
9 no connect Internal Pullup 30KW to Vcc
10 VeeR Receiver Ground
11 VeeR Receiver Ground
12 RD- Inverse Received Data Out Note 5
13 RD+ Received Data Out Note 5
14 VeeR Receiver Ground
15 VccR Receiver Power + 3.3 V Note 6
16 VccT Transmitter Power + 3.3 V Note 6
17 VeeT Transmitter Ground
18 TD+ Transmitter Data In Note 7
19 TD- Inverse Transmitter Data In Note 7
20 VeeT Transmitter Ground
Notes:
1. TX_FAULT is an open collector/drain output, which must be pulled up with a 4.7k – 10kΩ resistor on the host board. When high, this output
indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.
2. TX_DISABLE is an input that is used to shut down the transmitter optical output. It is internally pulled up (within the transceiver) with a 6.8kΩ
resistor.
Low (0 – 0.8V): Transmitter on
Between (0.8V and 2.0V ): Undened
High (2.0 – Vcc max) or OPEN: Transmitter Disabled
3. The signals Mod-Def 0, 1, 2 designate the two wire serial interface pins. They must be pulled up with a 4.7k – 10kΩ resistor on the host board.
Mod-Def 0 is grounded by the module to indicate the module is present
Mod-Def 1 is serial clock line (SCL) of two wire serial interface
Mod-Def 2 is serial data line (SDA) of two wire serial interface
4. RX_LOS (Rx Loss of Signal) is an open collector/drain output that must be pulled up with a 4.7k – 10kΩ resistor on the host board. When high,
this output indicates the received optical power is below the worst case receiver sensitivity (as dened by the standard in use). Low indicates
normal operation. In the low state, the output will be pulled to < 0.8V.
5. RD-/+ designate the dierential receiver outputs. They are AC coupled 100Ω dierential lines which should be terminated with 100Ω dierential
at the host SERDES input. AC coupling is done inside the transceiver and is not required on the host board. The voltage swing on these lines will
be between 370 and 850 mV dierential (185 – 425 mV single ended) when properly terminated.
6. VccR and VccT are the receiver and transmitter power supplies. They are dened at the SFP connector pin. The maximum supply current is 300
mA and the associated in-rush current will typically be no more than 30 mA above steady state after 500 nanoseconds.
7. TD-/+ designate the dierential transmitter inputs. They are AC coupled dierential lines with 100Ω dierential termination inside the module.
The AC coupling is done inside the module and is not required on the host board. The inputs will accept dierential swings of 180 – 1200 mV (90
– 600 mV single ended).
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