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AFBR-83CDZ Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-83CDZ Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
2 / 27 page 2 Avago Technologies Confidential Receiver The optical receiver incorporates a 12-channel PIN photo- diode array, a 12-channel pre-amplifier and output buffer, diagnostic monitors, and control and bias blocks. The Rx Output Buffer provides differential outputs for the high speed electrical interface presenting nominal single-end- ed output impedances of 50 W to AC ground and 100 W differentially that should be differentially terminated with 100 W. AC coupling capacitors are located inside the CXP module and are not required on the host board. Modules have a monitor for optical input power; results are available through the TWS interface. Alarm thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. Over the TWS interface, the user can, for individual channels, control (flip) polarity of the differential outputs, de-activate channels, disable the squelch function, program output signal amplitude and deemphasis. Flags are also set and interrupts generated for loss of optical input signal (LOS). All flags are latched and will remain set even if the condition initiating the latch clears and operation resumes. All interrupts can be masked and flags are reset upon reading the appropriate flag register. The electrical output will squelch for loss of input signal (unless squelch is disabled) and channel de-activation through TWS interface. Status and alarm information are available via the TWS interface. To reduce the need for polling, the hardware interrupt signal is provided to inform hosts of an assertion of an alarm and/or LOS. Transmitter The optical transmitter incorporates a 12-channel VCSEL (Vertical Cavity Surface Emitting Laser) array, a 12-channel input buffer and laser driver, diagnostic monitors, and control and bias blocks. The transmitter is designed for EN 60825 and CDRH eye safety compliance. The Tx Input Buffer provides differential inputs presenting a nominal differential input impedance of 100 Ohms. AC coupling capacitors are located inside the CXP module and are not required on the host board. For module control and inter- rogation, the control interface incorporates a Two Wire Serial (TWS) interface of clock and data signals. Modules have monitors for VCSEL bias, light output power (LOP), temperature, and power supply voltage implement- ed;real-timeresultsareavailablethroughtheTWSinterface. Alarm thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. Over the TWS interface, the user can, for individual channels, control (flip) polarity of the differential inputs, de-activate channels, disable the squelch function and program input equalization levels to reduce the effect of long PCB traces. Flags are also set and interrupts generated for loss of input signal (LOS) and transmitter fault conditions. All flags are latched and will remain set even if the condition initiating the latch clears and operation resumes. All interrupts can be masked and flags are reset by reading the appropriate flag register. The optical output will AC squelch for loss of input signal unless squelch is disabled. The input thresholds for the Tx squelch are tied to Tx LOS thresholds which are informa- tive only. See Tx LOS thresholds specification on page 6. Fault detection or channel deactivation through the TWS interface will disable the channel. Status, alarm and fault information are available via the TWS interface. To reduce the need for polling, the hardware interrupt signal is provided to inform hosts of an assertion of an alarm, LOS and/or Tx fault. WARNING CAUTION! Safe to view laser output with the naked eye or with the aid of typical magifying optics (e.g. telescope or microscope.) CAUTION! Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure Note: Standard used for classification: EN 60825-1:2007 CLASS 1 LASER PRODUCT CLASS 1 LASER PRODUCT: INVISIBLE LASER RADIATION, DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS |
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