afct-5715z Avago Technologies, afct-5715z Datasheet - Page 3

• Manufacturer Part Number: afct-5715z
• Description: Families Of Single-mode Small Form Factor Pluggable Sfp Optical Transceivers With Optional Dmi For Gigabit Ethernet 1.25 Gbd
• Manufacturer: Avago Technologies

Figure 2. Pin description of the SFP electrical interface.
Figure 3. Typical Application Configuration
3
106.25 MHz
20
19
18
17
16
15
14
13
12
11
PROTOCOL
V
TD–
TD+
V
V
V
V
RD+
RD–
V
EE
EE
CC
CC
EE
EE
REFCLK
TOP OF BOARD
T
T
R
R
T
R
IC
Tx_FAULT
Rx_RATE
Rx_LOS
GPIO(X)
GPIO(X)
EWRAP
VREFR
GP14
RBC
TBC
3 2 1
ENGAGEMENT
SEQUENCE
TX[0:9]
TBC
EWRAP
RX[0:9]
RBC
Rx_RATE
(AS VIEWED THROUGH TOP OF BOARD)
3.3 V
REFCLK
10
VREFR
1
2
3
4
5
6
7
8
9
3.3 V
BOTTOM OF BOARD
V
TX FAULT
TX DISABLE
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
RATE SELECT
LOS
V
V
EE
EE
EE
T
R
R
4.7 K to 10 K
10 µF
SO+
SO–
SI+
SI–
100
0.1 µF
3 2 1
4.7 K to 10 K
4.7 K to
10 K
50
50
50
50
Transmitter Section
The transmitter section includes a 1310 nm Fabry-Perot
laser and a transmitter driver circuit. The driver circuit
maintains a constant optical power level provided that
the data pattern is valid 8B/10B code. Connection to
the transmitter is provided via a LC optical connector.
The transmitter has full IEC 60825 and CDRH Class 1
eye safety.
TX_DISABLE
The transmitter output can be disabled by asserting
pin 3, TX_DISABLE. A high signal asserts this function
while a low signal allows normal laser operation. In
addition, via the 2-wire serial interface the transmitter
output can be disabled (address A2h, byte 110, bit 6)
or monitored (address A2h, byte 110, bit 7). The
contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter
operation. In the event of a transceiver fault, such as
the activation of the eye safety circuit, toggling of the
TX_DISABLE will reset the transmitter, as depicted in
Figure 4.
4.7 K to
10 K
1 µH
1 µH
10 µF
4.7 K to
10 K
Tx_DISABLE
Tx_FAULT
0.1 µF
MOD_DEF2
MOD_DEF1
MOD_DEF0
Rx_LOS
3.3 V
RD+
RD–
TD+
TD–
0.1
RX GND
TX GND
µF
V CC ,T
V CC ,R
0.01 µF
0.01 µF
0.01 µF
0.01 µF
4.7 K to 10 K
V CC ,R
V CC ,R
100
SFP MODULE
50
50
AMPLIFICATION
QUANTIZATION
LASER DRIVER
EEPROM
CIRCUITRY
& SAFETY
&