AGILENT HFCT

Agilent HFCT-5205 SC Duplex
Single Mode Transceiver
Data Sheet
Description
The HFCT-5205 transceiver is a
high performance, cost effective
module for serial optical data
communications applications
specified for a signal rate of
155 MBd. It is designed to provide
a SONET/SDH compliant link for
155 Mb/s intermediate reach links.
The transmitter section uses a
Multiple Quantum Well laser with
full IEC 825 and CDRH Class I eye
safety.
This module is designed for single
mode fiber and operates at a
nominal wavelength of 1300 nm.
It incorporates Agilent’s high
performance, reliable, long
wavelength optical devices and
proven circuit technology to give
long life and consistent service.
A pseudo-ECL logic interface
simplifies interface to external
circuitry.
The receiver section uses a planar
PIN photodetector for low dark
current and excellent
responsivity.
Features
• SC duplex single mode
transceiver
• Intermediate SONET OC3 SDH
STM1 (S1.1) compliant
• Single +5 V power supply
• Multisourced 1 x 9 pin
configuration
• Aqueous washable plastic
package
• Interchangeable with LED
multisourced 1 x 9 transceivers
• Unconditionally eye safe laser IEC
825/CDRH Class 1 compliant
• Two temperature ranges:
0°C to +70°C - HFCT-5205B/D
-40°C to +85°C - HFCT-5205A/C
Applications
• SONET/SDH equipment
interconnect
• ATM 155 Mb/s links
Connection Diagram
RECEIVER SIGNAL GROUND o 1
RECEIVER DATA OUT o 2
N/C
RECEIVER DATA OUT BAR o 3
SIGNAL DETECT o 4
RECEIVER POWER SUPPLY o 5
TRANSMITTER POWER SUPPLY o 6
Top View
TRANSMITTER DATA IN BAR o 7
TRANSMITTER DATA IN o 8
N/C
TRANSMITTER SIGNAL GROUND o 9
Pin Descriptions:
Pin 1 Receiver Signal Ground VEER:
Directly connect this pin to the
receiver ground plane.
Pin 2 Receiver Data Out RD:
See recommended circuit
schematic, Figure 4.
Pin 3 Receiver Data Out Bar RD:
See recommended circuit
schematic, Figure 4.
Pin 4 Signal Detect SD:
Normal optical input levels to the
receiver result in a logic “1”
output.
Low optical input levels to the
receiver result in a fault condition
indicated by a logic “0” output.
This Signal Detect output can be
used to drive a PECL input on an
upstream circuit, such as Signal
Detect input or Loss of Signal-bar.
2
Pin 5 Receiver Power Supply VCCR:
Provide +5 V dc via the
recommended transmitter power
supply filter circuit. Locate the
power supply filter circuit as close
as possible to the VCC pin.
Pin 6 Transmitter Power Supply VCCT:
Provide +5 V dc via the
recommended transmitter power
supply filter circuit. Locate the
power supply filter circuit as close
as possible to the VCC pin.
Pin 7 Transmitter Data In Bar TD:
See recommended circuit
schematic, Figure 4.
Pin 8 Transmitter Data In TD:
See recommended circuit
schematic, Figure 4.
Pin 9 Transmitter Signal Ground VEET:
Directly connect this pin to the
transmitter ground plane.
Mounting Studs
The mounting studs are provided
for mechanical attachment to the
circuit board. They are embedded
in the nonconductive plastic
housing and are not tied to the
transceiver internal circuit and
should be soldered into
plated-through holes on the
printed circuit board.
Functional Description
Receiver Section
Design
The receiver section contains an
InGaAs/InP photo detector and a
preamplifier within the receptacle,
coupled to a postamp/decision
circuit on a separate circuit board.
The postamplifier is ac coupled to
the preamplifier as illustrated in
Figure 1. The coupling capacitor
is large enough to pass the
SONET/SDH test pattern at
155 MBd without significant
distortion or performance penalty.
If a lower signal rate, or a code
which has significantly more low
frequency content is used,
sensitivity, jitter and pulse
distortion could be degraded.
Figure 1 also shows a filter
network which limits the
bandwidth of the preamp output
signal. The filter is designed to
bandlimit the preamp output
noise and thus improve the
receiver sensitivity.
These components will also
reduce the sensitivity of the
receiver as the signal bit rate is
increased above 155 MBd.
Noise Immunity
The receiver includes internal
circuit components to filter
power supply noise. Under some
conditions of EMI and power
supply noise, external power
supply filtering may be necessary.
If receiver sensitivity is found to
be degraded by power supply
noise, the filter network illustrated
in Figure 2 may be used to improve
performance. The values of the
filter components are general
recommendations and may be
changed to suit a particular
system environment. Shielded
inductors are recommended.
Terminating the Outputs
The PECL Data outputs of the
receiver may be terminated with
the standard Thevenin-equivalent
50 ohm to VCC - 2 V termination.
Other standard PECL terminating
techniques may be used.
The Signal Detect Circuit
The Signal Detect circuit works by
sensing the peak level of the
received signal and comparing
this level to a reference.
DATA OUT
FILTER
TRANSIMPEDANCE
PREAMPLIFIER
The two outputs of the receiver
should be terminated with
identical load circuits to avoid
unnecessarily large ac current in
VCC. If the outputs are loaded
identically the ac current is largely
nulled. The Signal Detect output
of the receiver is PECL logic and
must be loaded if it is to be used.
The Signal Detect circuit is much
slower than the data path, so the
ac noise generated by an
asymmetrical load is negligible.
Power consumption may be
reduced by using a higher than
normal load impedance for the
Signal Detect output.
Transmission line effects are not
generally a problem as the
switching rate is slow.
PECL
OUTPUT
BUFFER
LIMITING
AMPLIFIER
DATA OUT
RECEIVER
RECEPTACLE
GND
SIGNAL
DETECT
CIRCUIT
Figure 1 - Receiver Block Diagram
3.3 µH
VCC
100 nF
100 nF
FILTERED VCC to DATA LINK
+
10 µF
Figure 2 - p Filter Network for Noise Filtering
3
PECL
OUTPUT
BUFFER
SD
Functional Description
Transmitter Section
Design
The transmitter section, Figure 3,
uses a Multiple Quantum Well
laser as its optical source. The
package of this laser is designed
to allow repeatable coupling into
single mode fiber. In addition, this
package has been designed to be
compliant with IEC 825 Class 1
and CDRH Class I eye safety
requirements. The optical output
is controlled by a custom IC
which detects the laser output via
the monitor photodiode. This IC
provides both dc and ac current
drive to the laser to ensure correct
modulation, eye diagram and
extinction ratio over temperature,
supply voltage and life.
PCB mounting
The HFCT-5205 has two
solderable mounting studs,
Figures 5 and 6. These studs are
not electrically connected. The
transceiver is designed for
common production processes. It
may be wave soldered and
aqueous washed providing the
process plug is in place.
Each process plug can only be
used once during processing,
although with subsequent use, it
can be used as a dust cover.
LASER
DATA
LASER
MODULATOR
DATA
PECL
INPUT
LASER BIAS
DRIVER
LASER BIAS
CONTROL
Figure 3 - Simplified Transmitter Schematic
4
PHOTODIODE
(rear facet monitor)
NO INTERNAL
CONNECTION
NO INTERNAL
CONNECTION
TOP VIEW
RD
2
VEER
1
SD
4
RD
3
VCCR
5
VCCT
6
TD
7
TD
8
VEET
9
C8 C2
C1 C7
VCC
L1
VCC
TERMINATE
AT THE
DEVICE
INPUTS
R6
R5
L2
C3
R7
R2
Vcc FILTER
AT Vcc PINS
TRANSCEIVER
C6
R8
R10
RD
RD
R3
C4
R9
SD
VCC
R1
C5
R4
W
W
W
TERMINATION
AT
TRANSCEIVER
INPUTS
TD
NOTES:
THE SPLIT-LOAD TERMINATIONS FOR ECL SIGNALS
NEED TO BE LOCATED AT THE INPUT OF DEVICES
RECEIVING THOSE ECL SIGNALS. RECOMMEND
4-LAYER PRINTED CIRCUIT BOARD WITH 50
MICROSTRIP SIGNAL PATHS BE USED.
R1 = R4 = R6 = R8 = R10 = 130
R2 = R3 = R5 = R7 = R9 = 82
C1 = C2 = 10 µF (see Figure 2)
C3 = C4 = C7 = C8 = 100 nF
C5 = C6 = 0.1 µF
L1 = L2 = 3.3 µH COIL OR FERRITE INDUCTOR.
TD
Figure 4 - Recommended Circuit Schematic
Regulatory Compliance
Feature
Electrostatic Discharge
(ESD) to the Electrical
Pins
Electrostatic Discharge
(ESD) to the Duplex SC
Receptacle
Electromagnetic
Interference (EMI)
Immunity
Eye Safety
5
Test Method
MIL-STD-883C
Method 3015.4
Performance
Class 1 (>1 kV) - Human Body Model
Variation of IEC 801-2
Products of this type, typically, withstand at least 25 kV
without damage when the Duplex SC Connector
Receptacle is contacted by a Human Body Model probe.
Typically provide a 17 dB margin to the noted standard
limits up to 6 GHz, when tested in a GTEM cell with the
transceiver mounted to a circuit card with a chassis
enclosure.
Typically show no measurable effect from a 10 V/m field
swept from 27 MHz to 1 GHz applied to the transceiver
without a chassis enclosure.
CDRH Accession Number: 9521220-26
FCC Class B
CENELEC EN55022 Class B
(CISPR 22A)
VCCI Class 1
Variation of IEC 801-3
FDA CDRH 21-CFR 1040
Class I
IEC 825 Issue 1 1993:11
Class 1
CENELEC EN60825 Class 1
TUV Bauart License: 933/510018/02
Performance Specifications
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause catastrophic damage to the device. Limits apply to each
parameter in isolation, all other parameters having values within the recommended operating conditions. It should not be
assumed that limiting values of more than one parameter can be applied to the product at the same time. Exposure to the
absolute maximum ratings for extended periods can adversely affect device reliability.
Parameter
Storage Temperature
Operating Temperature - HFCT-5205B/D
Operating Temperature - HFCT-5205A/C
Lead Soldering Temperature/Time
Output Current (other outputs)
Input Voltage
Power Supply Voltage
Symbol
TS
IOUT
-
Minimum
-40
0
-40
0
GND
0
Maximum
+85
+70
+85
+260/10
30
VCC
+6
Units
°C
°C
°C
°C/s
mA
V
V
Notes
1
1
-
Symbol
VCC
TOP
TOP
Minimum
+4.75
0
-40
Maximum
+5.25
+70
+85
Units
V
°C
°C
Notes
1
1
Minimum
Maximum
Units
1261
1360
nm
7.7
nm
PO
-15
-8
dBm
8.2
dB
ER
ICC
140
mA
Compliant with Bellcore TR-NWT-000253 and
ITU recommendation G.957
2
ns
tR
2
ns
tF
IIL
-350
µA
350
µA
IIH
VIH - VIL
300
mV
-1.58
V
VOL - VCC -2.0
-0.74
V
VOH - VCC -1.1
Notes
2
3
Operating Environment
Parameter
Power Supply Voltage
Ambient Operating Temperature - HFCT-5205B/D
Ambient Operating Temperature - HFCT-5205A/C
Transmitter Section
(Ambient Operating Temperature VCC = 4.75V to 5.25V)
Parameter
Output Center Wavelength
Output Spectral Width (RMS)
Average Optical Output Power
Extinction Ratio
Power Supply Current
Output Eye
Optical Rise Time
Optical Fall Time
Data Input Current - Low
Data Input Current - High
Differential Input Voltage
Data Input Voltage - Low
Data Input Voltage - High
Symbol
lC
Dl
4
4
5
5
Notes:
1. 2 m/s air flow required.
2. Output power is power coupled into a single mode fiber.
3. The power supply current varies with temperature. Maximum current is specified at VCC = Maximum @ maximum temperature (not including
terminations) and end of life.
4. 10% - 90% Values
5. These inputs are compatible with 10K, 10KH and 100K ECL and PECL inputs.
6
Receiver Section
(Ambient Operating Temperature VCC = 4.75V to 5.25V)
Parameter
Receiver Sensitivity
Maximum Input Power
Signal Detect - Asserted
Signal Detect - Deasserted
Signal Detect - Hysteresis HFCT-5205B/D
Signal Detect - Hysteresis HFCT-5205A/C
Power Supply Current
Data Output Voltage - Low
Data Output Voltage - High
Signal Detect Output Voltage - Low
Signal Detect Output Voltage - High
Symbol
PA
PD
PA - PD
PA - PD
ICC
VOL - VCC
VOH - VCC
VOL - VCC
VOH - VCC
Minimum
-8
PD +0.5
-45
0.5
0.5
-2.0
-1.1
-2.0
-1.1
Typical
80
-
Maximum
-31
-31
4.0
5.0
100
-1.58
-0.74
-1.58
-0.74
Units
dBm
dBm
dBm avg.
dBm avg.
dB
dB
mA
V
V
V
V
Notes:
6. Minimum sensitivity and saturation levels for a 2 23-1 PRBS with 72 ones and 72 zeros inserted. (ITU-T recommendation G.958).
7. The current excludes the output load current.
8. These outputs are compatible with 10K, 10KH and 100K ECL and PECL outputs.
7
Notes
6
7
8
8
8
8
Drawing Dimensions
Agilent XXXX-XXXX
ZZZZZ LASER PROD
N.B. For shielded
module the label
is mounted on
the end as
shown.
TX
39.6
MAX.
(1.56)
12.7
(0.50)
KEY:
YYWW = DATE CODE
XXXX-XXXX = HFCT-5205
ZZZZ = 1300 nm
4.7
(0.185)
AREA
RESERVED
FOR
PROCESS
PLUG
25.4 MAX.
(1.00)
+0.1
0.25 -0.05
+0.004
(0.010 -0.002
21CFR(J) CLASS 1
COUNTRY OF ORIGIN YYWW
RX
SLOT DEPTH
12.7
(0.50)
SLOT WIDTH
2.5
(0.10)
2.0 ± 0.1
(0.079 ± 0.004)
)
9.8
MAX.
(0.386)
0.51
(0.020)
3.3 ± 0.38
(0.130 ± 0.015)
9X
Æ
23.8
(0.937)
20.32
(0.800)
+0.25
0.46 -0.05
+0.010
(0.018 -0.002 )
20.32
(0.800)
2X
2X
8X 2.54
(0.100)
1.3
Æ (0.051)
+0.25
1.27 -0.05
+0.010
(0.050 -0.002)
Æ
20.32
(0.800)
14.5
(0.57)
Masked insulator material (no metalization)
DIMENSIONS ARE IN MILLIMETERS (INCHES).
TOLERANCES: X.XX ±0.025 mm
UNLESS OTHERWISE SPECIFIED.
X.X ±0.05 mm
Figure 5. Package Outline Drawing for HFCT-5205
8
15.8 ± 0.15
(0.622 ± 0.006)
2 x Ø 1.9 ± 0.1
(0.075 ± 0.004)
20.32
(0.800)
9 x Ø 0.8 ± 0.1
(0.032 ± 0.004)
20.32
(0.800)
2.54
(0.100)
TOP VIEW
DIMENSIONS ARE IN MILLIMETERS (INCHES)
Figure 6. Recommended Board Layout Pattern
Ordering Information
Temperature Range 0°C to +70°C
HFCT-5205B
Black Case
HFCT-5205D
Blue Case
Temperature Range -40°C to +85°C
HFCT-5205A
Black Case
HFCT-5205C
Blue Case
Supporting Documentation
Application Note 1098
Characterization Report
Qualification Report
Class 1 Laser Product: This product conforms to the
applicable requirements of 21 CFR 1040 at the date of
manufacture
Date of Manufacture:
Agilent Technologies Ltd., Whitehouse Road, Ipswich, England
Handling Precautions
1. The HFCT-5205 can be damaged by current surges or overvoltage.
Power supply transient precautions should be taken.
2. Normal handling precautions for electrostatic sensitive devices
should be taken.
9
www.semiconductor.agilent.com
Data subject to change.
Copyright © 2001 Agilent Technologies, Inc.
Obsoletes: 5980-1656E
January 28, 2001
5988-2060EN