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AFBR-810BEZ Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-810BEZ Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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2 / 48 page  2 Transmitter Module The optical transmitter module (see Figure 1) incorporates a 12-channelVCSEL (Vertical Cavity Surface Emitting Laser) array, a 12-channel input buffer and laser driver, diagnos- tic monitors, control and bias blocks. The transmitter is designed for IEC-60825 and CDRH eye safety compliance; Class 1M out of the module. The Tx Input Buffer provides CML compatible differential inputs (presenting a nominal differential input impedance of 100 Ohms and a nominal common mode impedance to signal ground of 25 Ohms) for the high speed electrical interface that can operate over a wide common mode range without requiring DC blocking capacitors. For module control and interroga- tion, the control interface (LVTTL compatible) incorpo- rates a Two Wire Serial (TWS) interface of clock and data signals and dedicated signals for host interrupt, module address setting and module reset. Diagnostic monitors for VCSEL bias, light output (LOP), temperature, both supply voltages and elapsed operating time are implemented and results are available through the TWS interface. Over the TWS interface, the user can, for individual channels, control (flip) polarity of the differential inputs, de-activate channels, place channels into margin mode, Figure 1. Transmitter Block Diagram Din[11:0][p/n] (24) IntL SDA SCL Adr[2:0] (3) ResetL Vcc33 (4) Vcc25 (2) Gnd Tx Input Buffer 12 Channels Laser Driver 12 Channels Control Diagnostic Monitors Bias disable the squelch function and program input equaliza- tion levels to reduce the effect of long PCB traces. A reset for the control registers is available. Serial ID information and alarm thresholds are provided. To reduce the need for polling, the TWS interface is augmented with an interrupt signal for the host. Alarm thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. 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 squelch for loss of input signal unless squelch is disabled. Fault detection or channel deactiva- tion through the TWS interface will disable the channel. Status, alarm and fault information are available via the TWS interface. The interrupt signal (selectable via the TWS interface as a pulse or static level) is provided to inform hosts of an assertion of an alarm, LOS and/or Tx fault. |
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