AFBR-59M5LZ Avago Technologies US Inc., AFBR-59M5LZ Datasheet - Page 3

• Manufacturer Part Number: AFBR-59M5LZ
• Description: TXRX OPT 850NM SFF 2X6
• Manufacturer: Avago Technologies US Inc.

Specifications of AFBR-59M5LZ

• Applications: Ethernet
• Data Rate: 2.215Gbd
• Wavelength: 850nm
• Voltage - Supply: 2.97 V ~ 3.63 V
• Connector Type: LC Duplex
• Mounting Type: Through Hole
• Data Rate Max: 2.125Gbps
• Supply Voltage: 3.3V
• Wavelength Typ: 850nm
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Component Monitoring
The AFBR-59M5LZ real-time monitors of Tx_Bias, Tx_Power,
Vcc, Temp and Rx Average Power may potentially be used
as a debugging aid for system installation and design, and
transceiver parametric evaluation for factory or field qual-
ification. For example, temperature per module can be
observed in high-density applications to facilitate thermal
evaluation of blades and systems.
Transmitter Section
The transmitter section contains 850nm VCSEL (Vertical
Cavity Surface Emitting Laser) light source, located at
the optical interface which mates with the LC optical
connector. The VCSEL is driven by a custom IC which uses
the incoming differential (PECL compatible) high speed
logic signal to modulate laser diode driver current. This
Tx laser driver circuit regulates optical output power at a
constant level provided the incoming data pattern is dc
balanced (8B/10B code, for example).
Transmit Disable (Tx_Disable)
The AFBR-59M5LZ accepts a TTL transmit disable control
signal input which shuts down the transmitter. A high
signal implements this function while a low signal allows
normal transceiver operation. In the event of a fault (e.g.
eye safety circuit activated), cycling this control signal
resets the module as depicted in Figure 5. An internal pull
down resistor enables the laser if the line is not connected
on the host board. Host systems should allow a 10ms
interval between successive assertions of this control
signal. Tx_Disable can be asserted via the two-wire serial
interface (address A2h, byte 110, bit 6) and monitored
(address A2h, byte 110, bit 7).
The contents of A2h, byte 110 bit 6 are logic Or’d with the
TX_DISABLE pin to control the transmit output.
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Eye Safety Circuit
The AFBR-59M5LZ provides Class 1 (single fault tolerant)
eye safety by design and has been tested for compliance
with the requirements listed in Table 1. The eye safety
circuit continuously monitors optical output power levels
and will disable the transmitter upon detecting an unsafe
condition beyond the scope of Class 1 certification. Such
unsafe conditions can be due to inputs from the host
board (Vcc fluctuation, unbalanced code) or a fault within
the transceiver.
Receiver Section
The receiver section contains a PIN photodiode and
custom transimpedance preamplifier, located at the optical
interface which mates with the LC optical connector. The
output is fed to a custom IC that provides post-amplifica-
tion and quantization.
Signal Detect (Sig_Det)
The post-amplification IC also includes the transition
detection circuitry which monitors the ac level of incoming
optical signals and provides a TTL status signal to the
host. An adequate optical input results in high signal
detect output while a low signal detect output indicates
an unusable optical input. The signal detect thresholds
are set so that a low output indicates a definite optical
fault has occurred. Signal Detect can be monitored via the
two-wire serial (address A2h, byte 110, bit 1).