S0189-TRPV3GELRX000E2G Datasheet, PDF (4/5 Pages) OPLINK Communications Inc. – Video 1310nm SFP Optical Transceiver

TRPV3GELRx000E2G
Application Notes
Electrical Interface: Signal interfaces are compatible with
the SFP MSA specification. The high speed DATA interface
is differential AC-coupled internally 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 logic HIGH
when an insufficient photocurrent is produced.
Serial Identification and Monitoring: The module definition
of SFP is indicated by the MOD_ABS pin and the 2-wrie serial
interface. Upon power up, the 2-wrie interface appears as NC
(no connection), and MOD_ABS is TTL LOW. When 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 device that are not write protected,
and the negative edge clocks data from the device. The serial
data signal (SDA) is for serial data transfer. The host uses SDA
in conjunction with SCL to mark the start and end of serial
protocol activation. The supported monitoring functions
are temperature, voltage, average receiver signal, all alarms
and warnings, and software monitoring of LOS. The device is
internally calibrated.
The data transfer protocol and the details of the mandatory
and vendor specific data structures are defined in the SFP MSA,
and SFF-8472, Rev. 9.4.
Power Supply and Grounding: The power supply line should
be well-filtered. All power supply bypass capacitors should be
as close to the transceiver module as possible.
Interfacing the Transceivers
Communication is via a serial 2-wire serial interface. As described in the document SFF-8472 (REV. 9.4) there are two distinct address spaces:
Byte Address
0 – 95
96 – 127
128 – 255
Base Address A0(hex)
Content
Serial Transceiver ID as defined in SFP MSA
OPLINK Specific
Reserved
Base Address A2(hex)
Byte Address
Content
0 - 55
Alarm & Warnings thresholds & limits
56 - 95
External calibration constants (not used)
96 – 119
Values from real time diagnostic monitoring
120 – 127 Not used
128 – 247 Customer specific, writable area
248 - 255 Not used
Application Schematics
1µH coil or ferrite bead
(<0.2Ω series resistance)
Vcc
3.3V
+ ₁₀
0.1
TX Disable
TX DATA IN+
16
0.1
2
8
15
+ ₁₀
0.1
5
SFP
6
20
50Ω line
18
13
50Ω line
TX DATA IN-
19
12
1, 4, 7, 11, 14, 17
Vcc
3.3V
RR R
R
TX Fault
LOS
I²C CLK
I²C DATA
50Ω line
50Ω line
RX DATA OUT+
to 50Ω load
RX DATA OUT-
to 50Ω load
R: 4.7 to 10kΩ
CAP Values in µF
Oplink Communications, Inc
No Connection: 3, 9, 10
4
S0189. Rev.03. (web) 2012-05-10