GO2921B31CM Schematic ( PDF Datasheet ) - Gennum

Teilenummer GO2921B31CM
Beschreibung 1310nm Optical Transceiver
Hersteller Gennum
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Gesamt 27 Seiten
GO2921B31CM Datasheet, Funktion
GO2921B31CM 1310nm Optical Transceiver
• Robust error free transmission of signals from 50Mbps
to 3Gbps with up to 30km single-mode fiber
• Maximum distance of 10km under worst-case
conditions and 3Gbps video pathological signals
• Supports video pathological patterns for SD-SDI,
• Hot-pluggable
• Laser disable pin
• Diagnose and control via I2C interface including:
Š Monitoring of laser bias current, average output
power, receive optical power, supply voltage and
Š Alarm reporting
Š Module ID polling
• Single +3.3V power supply
• RoHS compliant
• Telcordia GR-468 compliant
• Operating temperature range: 0°C to 70°C (case)
• 56.5mm x 13.4mm x 8.6mm SFP Package
• SMPTE 297-2006 compatible
• SMPTE 297-2006 compatible optical-to-electrical
• Broadcast cameras
The GO2921B is an optical transceiver module designed to
transmit and receive electrical and optical serial digital
signals as defined in SMPTE 297-2006. The GO2921B is
specifically designed for robust performance in the
presence of SDI pathological patterns for SMPTE 259M,
SMPTE 344M, SMPTE 292M and SMPTE 424M serial rates.
The GO2921B contains a PIN photodiode receiver and a
1310nm Fabry-Perot laser transmitter designed to provide
error-free transmission of signals from 50Mbps to 3Gbps
over single mode fiber (9/125). It is also hot-pluggable.
The GO2921B provides extensive operational status
monitoring through an I2C interface. Input optical power is
monitored in the receiver; output optical power and bias
current are monitored in the transmitter. Other operating
conditions, such as power supply and operating
temperature, are also monitored. If a monitored parameter
falls outside the pre-defined range, an alarm flag for the
parameter is raised.
Ordering Information
Part Number
Temperature Range
TCASE= 0°C to 70°C
GO2921B 3G-SDI 1310nm Video Optical Transceiver Module
GO2921B31CM 1310nm Optical Transceiver
Data Sheet
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GO2921B31CM Datasheet, Funktion
2.3 Host Board Power Supply Requirements
The host board is required to provide a regulated and filtered power supply of 3.3V +/-
5% for the GO2921B via the on board SFP connector. Figure 2-3 shows the
recommended board supply filtering. When the host board is loaded with a resistive
load in place of the SFP module and sourcing the maximum rated current, the
peak-to-peak power supply noise measured on the SFP connector should comply to
Table 2-2.
Host Board
Figure 2-3: Recommended Host Board Supply Filtering
Table 2-2: Maximum Allowable Host Board Power Supply Noise at Vcc_Rx
and Vcc_Tx
Frequency (KHz)
Peak-to-Peak Noise Amplitude (%)
2.4 Optical Connector Requirements
An LC connector with PC/UPC polish is required for each port.
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Data Sheet
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6 Page

GO2921B31CM pdf, datenblatt
4. Digital Diagnostics
4.1 I2C Bus Interface
The I2C interface allow reading of diagnostic information from the module. It is
comprised of I2C DATA and I2C CLK pins. All address and data bytes are transmitted
through the I2C DATA pin. The I2C DATA and I2C CLK pins are open-collector and they
must be pulled high (4.75kΩ recommended) externally to the module. Data on the I2C
DATA pin may only change during I2C CLK 'low' time periods. Data changes during I2C
CLK 'high' periods will indicate either a START or STOP condition. Operations and
conditions are described as follows:
START Condition
The START condition is originated by the host. A high-to-low transition of I2C DATA
while I2C CLK 'high' defines a START condition that must precede any other command,
see Figure 4-1.
STOP Condition
The STOP condition is originated by the host. A low-to-high transition of I2C DATA while
I2C CLK 'high' defines a STOP condition, see Figure 4-1.
Figure 4-1: I2C START and STOP Condition
Acknowledge or ACK Condition
The acknowledge condition occurs when the I2C DATA pin is pulled 'low' during the
ninth clock pulse following an address or data byte. The module originates this
condition after it has received a block or data address. The host originates this condition
during a sequential address read operation.
Addressing Operation
The module must receive a block address following a START condition to enable a read
operation. The block address is clocked into the module MSB to LSB. There are three read
operations: current address read, random read, and sequential address read.
Note that by the convention specified in the SFP MSA, 7-bit block addresses are left
shifted by one bit when expressing them in hex. Block addresses for the different
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Data Sheet
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