AFCT-57V6USZ
Small Form Factor Pluggable (SFP) LC Optical Transceiver
for 1.25GBd Ethernet at Extended Link Lengths (Up to 80km)
Data Sheet
Description
The Avago Technologies AFCT-57V6USZ transceiver is a
low-cost and hot-pluggable SFP MSA-compliant optical
interconnect module for Gigabit Ethernet applications at
transmission distances up to 80km
[1, 2]
.
The AFCT-57V6USZ implements the serial portion of the
physical layer, and supports the features shown below
The AFCT-57V6USZ features differential serial I/O inter-
face lines that are AC-coupled signals. Avago’s design
of the long wavelength SFP module uses a 1550 nm
distributed feedback (DFB) laser diode (LD) and takes
advantage of an integrated preamplifier/photo-detector.
The AFCT-57V6USZ also contains transmitter, receiver and
control electronics.
Singlemode optical fiber, with LC connectors, is rec-
ommended as the communication media. The AFCT-
57V6USZ has a digital diagnostic monitoring (DDM)
function in accordance with SFF-8472
[3]
which allows
monitoring operating temperature, supply voltage, laser
bias current, transmitter optical output power and optical
received power in real time via a serial-ID interface.
On the following page, Table1 lists the general specifica-
tions for the AFCT-57V6USZ.
Figure 1 shows a simplified block diagram of the AFCT-
57V6USZ electronics
Features
•
Gigabit Ethernet transceiver
•
RoHS-6 Compliant
•
IEEE 802.3z, 1000BASE-ZX
•
Extended transmission distance up to 80 km
•
Compliant with SFP Multi Source Agreement (MSA)
•
Duplex-LC optical interface
•
•
•
•
•
•
•
•
•
•
•
1550 nm DFB-LD with isolator
Serial ID
Digital Diagnostic Monitoring interface
Bail delatch for easy removal from cage
Available in industrial temperature range
(-40 to +85°C)
Immune to ESD, RF fields, and Vcc noise
Designed for very low RF emissions
Class 1 laser safety
AC-coupled differential serial I/O interface
Single +3.3 Volt supply operation
Low power dissipation
Related Products
•
AFBR-5715xZ family:
850 nm 1.25 GBd 3.3 V multimode SFP Gigabit Ether-
net transceivers with DMI
•
AFCT-5715xZ:
1.25 GBd Ethernet (1000Base-LX) SFP with DMI
Applications
•
Ethernet switches
•
Multi-service switches and routers
•
Broadband aggregation and wireless infrastructure
•
Switched backplane applications
•
High Speed Interface for server farms
•
Metro access switch GbE connections
Module Definition
(A0h)
SDA
MOD_DEF[1]
MOD_DEF[2]
SCL
Digital Diagnostic
Monitoring Interface
(A2h)
SCL
SDA
100 ohm
TD-
DFB-LD
DC Bias
Circuit
Monitor
PD
TX_DISABLE
TX_FAULT
Control Circuit
APC
Circuit
Transmitter
Optical
Connector
TD +
Modulation
Bias
Circuit
Optical
Output
RD -
RX_LOS
Limiting
Amp
Level
Detector
TZ
AMP
PIN-PD
Receiver
Figure 1. AFCT-57V6USZ Simplified Block Diagram
Table 1. General AFCT-57V6USZ Specifications
Parameter
Nominal Bit Rate
Link Loss Budget
Minimum Required Link Loss
Bit Error Ratio(BER)
Fiber Core Diameter
Operating Range(max)
†
1000BASE-ZX*
1.25
24
5
<10
-12
9
80
unit
Gbps
dB
dB
-
µm
km
Optical specifications are modified to realize 80 km transmission in singlemode fiber.
2
Optical
Connector
RD +
Optical
Input
Absolute Maximum Ratings
Operation of the AFCT-57V6USZ beyond the Absolute
Maximum Ratings listed in Table 2 can degrade or dam-
age the product. With the exception of laser safety, it
is not implied that the product will function above the
Recommended Operating Conditions. It is possible to
reduce the reliability and lifetime of the device if the
Recommended Operating Conditions are exceeded (see
Table 3).
Recommended Operating Conditions
Table 3 lists the conditions under which the AFCT-
57V6USZ is tested and should be operated. It is possible
to reduce the reliability and lifetime of the device if these
ratings are exceeded for extended periods. Functional
operation should be restricted to these Recommended
Operating Conditions.
Table 2. Absolute Maximum Ratings
Parameter
Supply Voltage
Relative Humidity *
TX_DISABLE Input Voltage
Storage Temperature
† No condensation
Symbol
Vcc
RH
VIN
Ts
Min
-0.3
5
-0.5
-40
Max
4.0
85
Vcc+0.5
+85
Unit
V
%
V
°C
Table 3. Recommended Operating Conditions
Parameter
Supply Voltage
Ripple And Noise
Operating Case Temperature
AFCT-57V6USZ
AFCT-57V6AUSZ
†
Symbol
Vcc
-
T
C
T
C
Min
2.97
-
-10
-40
Typ
3.3
-
-
-
Max
3.63
100
85
85
Unit
V
mVp-p
°C
°C
Measured with a sinusoidal signal from 100 Hz to 2 MHz at the input of the recommended power supply filter shown in Figure 13.
Handling Precautions
Avago advises that precautions be taken to avoid elec-
trostatic discharge (ESD) during handling, assembly, and
testing of the AFCT-57V6USZ. Degradation or damage
can occur if proper guidelines for handling ESD sensitive
devices are not followed. This could result in an inoper-
able device or unsafe operation as described above.
In particular, avoid getting particulate or solvent contami-
nation onto the optical surfaces of the laser and photo-
detector assemblies. It is also strongly recommended that
the LC connector receptacle be covered when not in use.
Excessive force when installing and extracting the AFCT-
57V6USZ should be avoided. Refer to the SFP Application
Note [6] for additional handling information.
Optical Description
Table 4 describes the performance of the transmitter por-
tion of the AFCT-57V6USZ over the operating conditions.
Table 5 describes the performance of the receiver portion
of the AFCT-57V6USZ over the operating conditions.
The optical pulse characteristics of the transmitter are
specified in the form of an eye pattern. When measured
in accordance with [2], the mask shown in Figure 2 evalu-
ates rise time, fall time, overshoot and undershoot.
3
Table 4. Transmitter Optical Specifications
Parameter
Spectral Center Wavelength
Symbol
l
C
Min
1500
Typ
1550
Max
1580
Unit
nm
-20dB Spectral Width
Side Mode Suppression Ratio
Optical Output Power, Average*
Extinction Ratio
Rise/Fall Time**
Total Jitter (TJ)
Optical Waveform
Dl
20
SMSR
P
O
ER
Tr/Tf
TJ
-
-
30
0
9
-
-
-
-
-
-
-
-
0.5
-
+5
-
260
0.28
nm
dB
dBm
dB
ps
UI
Compliant with IEEE 802.3z eye mask (Refer -
to Figure 2)
Disable Optical Output Power
† SMF 9/125
†† 20 % - 80 % edge rate without filter
-
-
-
-35
dBm
Table 5. Receiver Optical Specifications
Parameter
Spectral Center Wavelength
Receiver Saturation
Minimum Receiver Sensitivity
RX_LOS Assert Level
RX_LOS De-assert Level
RX_LOS Hysteresis
Symbol
l
C
Pmax
Pmin
LOS
A
LOS
D
LOS
HYS
Min
1270
0
.
-35
.
0.5
Typ
-
-
-
-
-
2
Max
1600
.
-24
.
-24
.
Unit
nm
dBm
dBm
dBm
dBm
dB
Return Loss
†
RL
12
-
.
dB
Receiver sensitivity is measured at the center of the eye for BER=1x10-12 using PRBS 2^7-1
130
100
Normalized Amplitude (%)
80
50
20
0
-20
0
22
37.5
62.5
78
100
Normalized Time (% of Unit Interval)
Figure 2. Transmitter Eye Mask
4
Electrical Description
The supply current of the AFCT-57V6USZ is described in
Table 6 below. The inrush current is defined as the ad-
ditional inrush due to hot plugging.
The characteristics for the control and status signals are
shown in Table 7. Output status signals, TX_FAULT and
RX_LOS, are all open-collector/drain, and the levels indi-
cated assuming 4.7k-10k ohm pull-up resistor to Host_Vcc
is present. The levels of MOD_DEF[1] and MOD_DEF[2]
are also indicated assuming that they are pulled up with
a 4.7k-10k ohm resistor to +3.3 V on host board. Table 8
indicates the voltage levels required to be delivered by
the host to the transmitter differential serial data input
TD+/-. Table 9 indicates the voltage level output from the
receiver differential serial data output RD+/-.
Table 6. Electrical Characteristics
Parameter
Supply Current
Inrush Current*
†
greater than the steady state value
Symbol
ICC
Linrush
Min
-
-
Typ
-
-
Max
300
30
Unit
mA
mA
Table 7. Control/Status Signal Characteristics
Parameter
TX_DISABLE Input Voltage - High
TX_DISABLE Input Voltage - Low
TX_FAULT Output Voltage - High
TX_FAULT Output Voltage - Low
RX_LOS Output Voltage – High
RX_LOS Output Voltage – Low
MOD_DEF[2] (SDA) Output Voltage – Low
Symbol
V
IH
V
IL
V
OH
V
OL
V
OH
V
OL
V
OL
Min
2.0
0
Host_Vcc-0.5
0
Host_Vcc-0.5
0
.
Max
VccT
0.8
Host_Vcc
0.4
Host_Vcc
0.4
0.4
Unit
V
V
V
V
V
V
V
MOD_DEF[1] (SCL) Input Voltage – High
MOD_DEF[1] (SCL) Input Voltage – Low
V
IH
V
IL
VccT, (VccR) x 0.7
-
.
VccT(VccR) x 0.3
V
V
Table 8. TD+/- Input Signal Requirements
Parameter
Input Amplitude, Differential
Symbol
V
I
Min
200
Typ
.
Max
2400
Unit
mV p-p
Input Impedance, Differential
Deterministic Jitter
Total Jitter ††
R
I
DJ
TJ
.
.
.
100
.
.
.
0.10
0.24
W
UI
UI
Mark Ratio
† AC-coupled.
†† TJ = RJ + DJ. At BER = 10-12
.
.
50
.
%
Table 9. RD+/- Output Signal Characteristics
Parameter
Output Amplitude, Differential*
Symbol
V
O
Min
600
Typ
-
Max
1200
Unit
mVp-p
Output Impedance, Differential
†
AC-coupled.
R
O
-
100
-
W
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
