AFBR-810BZ datasheet(2/48 Pages) AVAGO

2 / 48 page

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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