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V23826-C18-C63
SM 155 Mbd ATM/SDH/SONET Transceiver
DC/DC (5V/3.3V) V23826-C18-C63/C363(*)
Single Mode 155 MBd ATM/SDH/SONET 1x9 Transceiver
FEATURESCompliant with ATM, SONET OC-3, SDH STM-1Meets mezzanine standard height of 9.8 mmCompact integrated transceiver unit withMQW laser diode transmitterInGaAs PIN photodiode receiverDuplex SC receptacleClass 1 FDA and IEC laser safety compliantFDA Accession No. 9520890-20Single power supply (5 V or 3.3 V)Signal detect indicatorPECL differential inputs and outputsProcess plug includedInput Signal Monitor Wave solderable and washable with process plug
insertedIndustry standard multisource 1x9 footprintFor distances of up to 15 km on single mode fiberSoldering Conditions Temp/Time
(MIL-STD 883C, Method 2003).............................250°C/5.5s
Note
1. For VCC–VEE (min., max.). 50% duty cycle. The supply current does
not include the load drive current of the receiver output.
*) Ordering Information
DESCRIPTIONThe Infineon single mode ATM transceiver complies with the
ATM Forum’s Network Compatible ATM for Local Network
Applications document and ANSI’s Broadband ISDN—Cus-
tomer Installation Interfaces, Physical Media Dependent Speci-
fication, T1.646-1995, Bellcore - SONET OC-3 / IR-1 and
ITU-T G. 957 STM-1 / S.1.1.
ATM was developed to facilitate solutions in multimedia appli-
cations and real time transmission. The data rate is scalable,
and the ATM protocol is the basis of the broadband public net-
works being standardized in the International Telecommunica-
tions Union (ITU), the former International Telegraph and
Telephone Consultative Committee (CCITT). ATM can also be
used in local private applications.
The Infineon single mode ATM transceiver is a single unit com-
prised of a transmitter, a receiver, and an SC receptacle. This
design frees the customer from many alignment and PC board
layout concerns. The module is designed for low cost WAN
applications. It can be used as the network end device interface
in workstations, servers, and storage devices, and in a broad
range of network devices such as bridges, routers, and intelli-
gent hubs, as well as wide area ATM switches.
This transceiver operates at 155.520 Mbit/s from a single power
supply (+5 Volt or 3.3 Volt). The differential data inputs and out-
puts are PECL compatible.
Functional DescriptionThis transceiver is designed to transmit serial data via single
mode cable.
Functional DiagramThe receiver component converts the optical serial data into
PECL compatible electrical data (RD and RDnot). The Signal
Detect (SD, active high) shows whether optical data present(1).
The transmitter converts electrical PECL compatible serial data
(TD and TDnot) into optical serial data.
This version contains an Input Signal Monitor (ISM), that
switches the optical power off if a continuously low level is
applied at Data Input.
The transmitter contains a laser driver circuit that drives the
modulation and bias current of the laser diode. The currents are
controlled by a power control circuit to guarantee constant out-
put power of the laser over temperature and aging.
The power control uses the output of the monitor PIN diode
(mechanically built into the laser coupling unit) as a controlling
signal, to prevent the laser power from exceeding the operating
limits.
Single fault condition is ensured by means of an integrated
automatic shutdown circuit that disables the laser when it
detects transmitter failures. A reset is only possible by turning
the power off, and then on again.
The transceiver contains a supervisory circuit to control the
power supply. This circuit generates an internal reset signal
whenever the supply voltage drops below thereset threshold.
It keeps the reset signal active for at least 15 milliseconds after
the voltage has risen above the reset threshold. During this
time the laser isinactive.
NoteWe recommend to switch off the transmitter supply (VCC-Tx) if no
transmitter input data is applied.
TECHNICAL DATAThe electro-optical characteristics described in the following
tables are only valid for use under the recommended operating
conditions.
Recommended Operating ConditionsNote
1. For VCC–VEE (min., max.) 50% duty cycle. The supply current does
not include the load drive current of the receiver output.
ransmitter Electro-Optical CharacteristicsNotes. Into single mode fiber, 9 µm diameter.
2. Laser power is shut down if power supply is below VTH and
switched on if power supply is above VTH after tRES.
3. Transmitter meets ANSI T1E1.2, SONET OC-3 and ITU-T G.957 mask
patterns.
Receiver Electro-Optical CharacteristicsNotes
1. Minimum average optical power at which the BER is less than
1x10-10 or lower. Measured with a 223-1 NRZ PRBS as recom-
mended by ANSI T1E1.2, SONET OC-3 and ITU-T G.957.An increase in optical power of data signal above the specified level
will cause the SIGNAL DETECT to switch from a Low state to a High
state.A decrease in optical power of data signal below the specified level
will cause the SIGNAL DETECT to switch from a High state to a Low
state.
4. DC/DC, PECL for Signal Detect
PECL compatible. Load is 50 Ω into VCC –2 V for data, 500 Ω to VEE
for Signal Detect. Measured under DC conditions. For dynamic mea-
surements a tolerance of 50 mV should be added. VCC=3.3 V/5 V.
TAMB=25°C.
Pin Description
Regulatory Compliance
EYE SAFETYThis laser based single mode transceiver is a Class 1 product. It
complies with IEC 60825-1 and FDA 21 CFR 1040.10 and
To meet laser safety requirements the transceiver shall be oper-
ated within the Absolute Maximum Ratings.
Caution
All adjustments have been made at the factory prior to ship-
ment of the devices. No maintenance or alteration to the
device is required.
Tampering with or modifying the performance of the device
will result in voided product warranty.Note
Failure to adhere to the above restrictions could result in a modifica-
tion that is considered an act of “manufacturing,” and will require,
under law, recertification of the modified product with the U.S. Food
and Drug Administration (ref. 21 CFR 1040.10 (i)).
Laser Data
Required Labels
Laser Emission
APPLICATION NOTEATM transceivers and matching circuits are high frequency
components and shall be terminated as recommended in the
application notes for proper EMI performance. Electromagnetic
emission may be caused by these components.
To prevent emissions it is recommended that cutouts for the
fiber connectors be designed as small as possible.
It is recommended that the Tx plug and the Rx plug be
separated with a bar that divides the duplex SC opening.
APPLICATION NOTE
Single Mode 155 MBd ATM 1x9 TransceiverThis Application Note assumes Fiber Optic Transceivers using
5 V power supply and SerDes Chips using 3.3 V power supply.
It also assumes no self biasing at the receiver data inputs (RD+/
RD-) of the SerDes chip (Refer to the manufacturer data sheet
for other applications). 3.3 V-Transceivers can be directly con-
nected to SerDes-Chips using standard PECL Termination
network.
Value of R1...R4 may vary as long as proper 50 Ω termination to
VEE or 100 Ω differential is provided. The power supply filtering
is required for good EMI performance. Use short tracks from
the inductor L1/L2 to the module VCCRx/VCCTx. Further applica-
tion notes for electrical interfacing are available upon request.
Ask for Appnote 82.
We strongly recommend a VEE plane under the module for get-
ting good EMI performance.
The transceiver contains an automatic shutdown circuit. Reset
is only possible if the power is turned off, and then on again.
(VCCTx switched below VTH).
Application Board available on request.
SHIELD OPTION
Shield with forward springs, -C3
