4
Receiver Section
The receiver section includes the Receiver Optical SubAs-
sembly (ROSA) and the amplication/quantization circuitry.
The ROSA, containing a PIN photodiode and custom tran-
simpedance 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 post-amplication and
quantization.
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-57D7APZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector) iden-
tied by function in Table 2. The board layout for this
interface is depicted in Figure 6.
The AFBR-57D7APZ high speed transmit and receive
interfaces require SFP MSA 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 SFF-8074i) and hence are
not required on the host board. The Tx_Disable, Tx_Fault,
and Rx_LOS lines require TTL lines on the host board (per
SFF-8074i) 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).
Figure 2 depicts the recom mended interface circuit to
link the AFBR-57D7APZ 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-57D7APZ. 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-57D7APZ. All mechanical
adjustments are made at the factory prior to shipment.
Tampering with, modifying, misusing or improp-
erly handling the AFBR-57D7APZ will void the product
warranty. It may also result in improper operation and
possibly overstress the laser source. Performance degrada-
tion or device failure may result. Connection of the
AFBR-57D7APZ to a light source not compliant with ANSI
FC-PI 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 manu-
facturing 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.avagotech.com or contact
Avago Technologies Semicon-ductor Products Customer
Response Center at 1-800-235-0312. For information
related to SFF Committee documentation visit www.scom-
mittee.org.
Regulatory Compliance
The AFBR-57D7APZ 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-57D7APZ 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 circum-
stances.
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 pre-cautions.
These include use of grounded wrist straps, work-benches
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.
