
4
Receiver Section
The receiver section includes the Receiver Optical Sub-
Assembly (ROSA) and the ampli cation/quantization
circuitry. The ROSA, containing a PIN photodiode and
custom transimpedance ampli er, 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-
ampli cation and quantization.
Receiver Loss of Signal (Rx_LOS)
The post-ampli cation 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 de nite 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-57L5APZ interfaces with the host circuit board
through twenty I/O pins (SFP electrical connector) iden-
ti ed by function in Table 2. The board layout for this
interface is depicted in Figure 6.
The AFBR-57L5APZ high speed transmit and receive inter-
faces 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-57L5APZ 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-57L5APZ. Please contact
your local Field Sales representative for availability and
ordering details.
Caution
There are no user serviceable parts nor maintenance re-
quirements for the AFBR-57L5APZ. All mechanical adjust-
ments are made at the factory prior to shipment. Tampering
with, modifying, misusing or improperly handling the
AFBR-57L5APZ 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-57L5APZ to a light
source not compliant with ANSI FC-PI or IEEE 802.3 speci -
cations, 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 manufacturing 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 Semiconductor Products
Customer Response Center at 1-800-235-0312. For infor-
mation related to SFF Committee documentation visit
www.s committee.org.
Regulatory Compliance
The AFBR-57L5APZ complies with all applicable laws
and regulations as detailed in Table 1. Certi cation level
is dependent on the overall con guration of the host
equipment. The transceiver performance is o ered as a
gure of merit to assist the designer.
Electrostatic Discharge (ESD)
The AFBR-57L5APZ 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.