AFCT-701ASDZ Avago Technologies US Inc., AFCT-701ASDZ Datasheet - Page 3

• Manufacturer Part Number: AFCT-701ASDZ
• Description: 10GbE SFP+ LR, RoHS (0-85degC)
• Manufacturer: Avago Technologies US Inc.

Specifications of AFCT-701ASDZ

• Data Rate: 10.312Gbd
• Wavelength: 1310nm
• Applications: Ethernet
• Voltage - Supply: 3.135 V ~ 3.465 V
• Connector Type: LC Duplex
• Mounting Type: SFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Transmitter Section
The transmitter section includes the Transmitter Opti-
cal Sub-Assembly (TOSA) and laser driver circuitry. The
TOSA, containing an Avago designed and manufactured
1310 nm DFB light source, is located at the optical inter-
face and mates with the LC optical connector. The TOSA
is driven by an IC which uses the incoming differential
high speed logic signal to modulate the laser diode driv-
er current. This Tx laser driver circuit regulates the optical
power at a level within the specified range.
Transmit Disable (TX_DISABLE)
The AFCT-701ASDZ accepts an LVTTL compatible trans-
mit disable control signal input which shuts down the
transmitter optical output. A high signal implements this
function while a low signal allows normal transceiver op-
eration. In the event of a fault (e.g. eye safety circuit ac-
tivated), cycling this control signal resets the module as
depicted in Figure 5. An internal pull up resistor disables
the transceiver transmitter until the host pulls the input
low. TX_DISABLE can also be asserted via the two-wire
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
hardware TX_DISABLE (contact 3) to control transmitter
operation. The normal behavior of this feature is to reset
a TX disabled transceiver to TX enabled when it is power
cycled or hot-plugged.
Figure 1. Transceiver functional diagram
3
OPTICAL INTERFACE
LIGHT FROM FIBER
LIGHT TO FIBER
RECEIVER
TRANSMITTER
PHOTO-DETECTOR
DFB
CONTROLLER & MEMORY
AMPLIFICATION
& QUANTIZATION
Transmit Fault (TX_FAULT)
A catastrophic laser fault will activate the transmitter
signal, TX_FAULT, and disable the laser. This signal is
an open collector output (pull-up required on the host
board). A low signal indicates normal laser operation and
a high signal indicates a fault. A fault is defined as laser
power below or above the specified IEEE 802.3ae speci-
fied min/max range. The TX_FAULT will be latched high
when a laser fault occurs and is cleared by toggling the
TX_DISABLE input or power cycling the transceiver. The
transmitter fault condition can also be monitored via the
two-wire serial interface (address A2, byte 110, bit 2).
CIRCUITRY
DRIVER &
SAFETY
LASER
RD+ (RECEIVE DATA)
RD– (RECEIVE DATA)
RX_LOS
RS0
RS1
SDA
SCL
MOD-ABS
TX_DISABLE
TD+ (TRANSMIT DATA)
TD– (TRANSMIT DATA)
TX_FAULT
ELECTRICAL INTERFACE