TRPE48KE2C000E2 Datasheet, PDF (4/5 Pages) OPLINK Communications Inc. – Extended Reach Multi-rate OC-48/STM-16 LR-2/L-16.2 SFP Transceivers with Digital Diagnostics

Example of SFP host board schematic
TRPE48K E2-E2 Multi-rate
Vcc
3.3V
1mH coilorferritebead
(<0.2W seriesresistance)
+ ₁₀
0.1
TX Disable
TX DATA IN+
TX DATA IN-
0.1
+ ₁₀
0.1
50W line
50W line
16
2
8
15
4
5
TRPE48K E2-E2
3
6
18
13
19
12
1,9,10,11,14,17,20
Vcc
3.3V
RR R
50W line
50W line
RR
TX Fault
LOS
M OD_DEF(2)
M OD_DEF(1)
M OD_DEF(0)
RX DATA OUT+
to 50W load
RX DATA OUT-
to 50W load
R:4.7 to 10kΩ
CAP Values in µF
A pplication N otes
Electrical interface: All signal interfaces are compliant with
the SFP MSA speci cation. The high speed DATA interface
is di erential AC-coupled internally with 1μF and can be
directly connected to a 3.3V SERDES IC. All low speed control
and sense output signals are open collector TTL compatible
and should be pulled up with a 4.7 - 10kΩ resistor on the
host board
Loss of Signal (LOS): The Loss of Signal circuit monitors
the level of the incoming optical signal and generates a logic
HIGH when an insu cient photocurrent is produced.
TX_Fault: The output indicates LOW when the transmitter
is operating normally, and HIGH with a laser fault including
laser end-of-life. TX Fault is an open collector/drain output
and should be pulled up with a 4.7 - 10kΩ resistor on the
host board. TX Fault is non-latching (automatically deasserts
when fault goes away).
TX_Disable: W hen the TX Disable pin is at logic HIGH, the
transmitter optical output is disabled (less than -45dBm).
Serial Identification and Monitoring: The module
de nition of SFP is indicated by the three module de nition
pins, MOD_DEF(0), MOD_DEF(1) and MOD_DEF(2).
Upon power up, MOD_DEF(1:2) appear as NC (no connection),
and MOD_DEF(0) is TTL LOW . W hen the host system detects
this condition, it activates the serial protocol (standard
two-wire I²C serial interface) and generates the serial clock
signal (SCL). The positive edge clocks data into the EEPROM
segments of the SFP that are not write protected, and the
negative edge clocks data from the SFP.
The serial data signal (SDA) is for serial data transfer. The
host uses SDA in conjunction with SCL to mark the startand
end of serial protocol activation. The supported monitoring
functions are internal temperature, supply voltage, bias
current, transmitter power, average receiver signal, all alarms
and warnings and software monitoring of TX Fault/LOS. The
device is internally calibrated.
The data transfer protocol and the details of the mandatory
and vendor speci c data structures are de ned in the SFP
MSA, and SFF-8472, Rev. 9.4.
Power supply and grounding: The power supply line should
be well- ltered. All 0.1μF power supply bypass capacitors
should be as close to the transceiver module as possible.
Oplink Communications, Inc.
4
21737-0975, Rev.A
2009-02-02