AFCT-57R5APZ Avago Technologies US Inc., AFCT-57R5APZ Datasheet - Page 3

• Manufacturer Part Number: AFCT-57R5APZ
• Description: TXRX OPT SFP LC 4/2/1GBD LC CONN
• Manufacturer: Avago Technologies US Inc.
• Series: -r

Specifications of AFCT-57R5APZ

• Data Rate: 4.25Gbps
• Wavelength: 1310nm
• Applications: General Purpose
• Voltage - Supply: 2.97 V ~ 3.63 V
• Connector Type: LC Duplex
• Mounting Type: SFP
• Function: Digital Diagnostic Optical Transceiver, supports high-speed singlemode optical fiber at signaling rates up to 4.25 Gb/s
• Product: Transceiver
• Maximum Rise Time: 0.9 ns/0.15 ns
• Maximum Fall Time: 0.9 ns/0.15 ns
• Pulse Width Distortion: 0.06 ns (Max)/0.061 ns (Max)
• Operating Supply Voltage: 2.97 V to 3.63 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 10 C
• Package / Case: SFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: Singlemode Glass
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Figure 1. Transceiver functional diagram.
Transmitter Section
The transmitter section includes a 1310-nm Fabry Perot
(FP) laser and a transmitter driver circuit. The driver circuit
maintains a constant average optical power output
with Fibre Channel and Ethernet 8B/10B coded data.
Optical connection to the transmitter is provided via an
LC connector. The TOSA is driven by a custom IC which
uses the incoming differential high speed logic signal
to modulate the laser diode driver current. This Tx laser
driver circuit regulates the optical power at a constant
level provided the incoming data pattern is dc balanced
(8B/10B code, for example).
Transmit Disable (TX_DISABLE)
The AFCT-57R5APZ accepts a TTL and CMOS compat-
ible transmit disable control signal input (pin 3) which
shuts down the transmitter optical output. 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 4. An internal
pull up resistor disables the transceiver transmitter until
the host pulls the input low. Host systems should allow
a 10 ms interval between successive assertions of this
control signal. Tx_Disable can also be asserted via the
two-wire serial interface (address A2h, byte 110, bit 6) and
monitored (address A2h, byte 110, bit 7).
3
OPTICAL INTERFACE
LIGHT FROM FIBER
LIGHT TO FIBER
RECEIVER
TRANSMITTER
PHOTO-DETECTOR
VCSEL
CONTROLLER & MEMORY
AMPLIFICATION
& QUANTIZATION
The contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter
operation
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. 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).
Eye Safety Circuit
The AFCT-57R5APZ 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 the optical output power
level and will disable the transmitter upon detecting an
unsafe condition beyond the scope of Class 1 certifica-
tion. Such unsafe conditions can be due to inputs from
the host board (Vcc fluctuation, unbalanced code) or a
fault within the transceiver.
CIRCUITRY
DRIVER &
SAFETY
LASER
RD+ (RECEIVE DATA)
RD– (RECEIVE DATA)
Rx LOSS OF SIGNAL
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
TX_DISABLE
TD+ (TRANSMIT DATA)
TD– (TRANSMIT DATA)
TX_FAULT
ELECTRICAL INTERFACE