APAC Opto Electronics LS42-CAU-PC-N Series User manual

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 1 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
No Shield Forward Clipper Backward Clipper
Features
 Compliant with IEEE 802.3z Gigabit Ethernet standard
 Compliant with Fiber Channel 100-SM-LC-L standard
 Industry standard 1×9 footprint
 SC duplex connector
 Single power supply 3.3V/5V
 Differential LVPECL/PECL inputs and outputs
 Compatible with solder and aqueous wash processes
 Class 1 laser product complies with EN 60825-1
Ordering Information
PART NUMBER WAVELENGTH INPUT/OUTPUT SIGNAL DETECT VOLTAGE CLIPPER TEMPERATURE
LS42-CAU-PC-Nxx 1470 ~ 1610 nm DC/DC LVPECL/PECL 3.3 V/5V --- 0°C to 70 °C
LS42-CAU-PC-Bxx 1470 ~ 1610 nm DC/DC LVPECL/PECL 3.3 V/5V Backward 0°C to 70 °C
LS42-CAU-PC-Fxx 1470 ~ 1610 nm DC/DC LVPECL/PECL 3.3 V/5V Forward 0°C to 70 °C
LS42-CAU-TC-Nxx 1470 ~ 1610 nm AC/AC TTL 3.3 V/5V --- 0°C to 70 °C
LS42-CAU-TC-Bxx 1470 ~ 1610 nm AC/AC TTL 3.3 V/5V Backward 0°C to 70 °C
LS42-CAU-TC-Fxx 1470 ~ 1610 nm AC/AC TTL 3.3 V/5V Forward 0°C to 70 °C
Note: XX=47, Center Wavelength=1470nm , XX=49, Center Wavelength=1490nm
XX=51, Center Wavelength=1510nm , XX=53, Center Wavelength=1530nm
XX=55, Center Wavelength=1550nm , XX=57, Center Wavelength=1570nm
XX=59, Center Wavelength=1590nm , XX=61, Center Wavelength=1610nm

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 2 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Absolute Maximum Ratings
PARAMETER SYMBOL MIN MAX UNITS NOTE
Storage Temperature TS−40 85 °C
Supply Voltage Vcc −0.5 6.0 V
Input Voltage VIN −0.5 Vcc V
Output Current Io--- 50 mA
Operating Current IOP --- 500 mA
Soldering Temperature TSOLD --- 260 °C 10 seconds on leads
Operating Environment
PARAMETER SYMBOL MIN MAX UNITS NOTE
Ambient Operating Temperature TAMB 0 70 °C
Supply Voltage Vcc 3.1 5.25 V
Supply Current (3.3V) ITX + IRX --- 300 mA
Supply Current (5.0V) ITX + IRX --- 400 mA

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 3 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Transmitter Electro-optical Characteristics
Vcc = 3.1 V to 5.25 V, TA= 0°C to 70°C
PARAMETER SYMBOL MIN TYP. MAX UNITS NOTE
Output Optical Power
9/125
µ m fiber Pout 0 --- +5 dBm Average
Extinction Ratio ER 7 --- --- dB
Center Wavelength
λ
CX-5.5 X+1 X+7.5 nm
Spectral Width (−20dB) ∆
λ --- --- 1 nm
Side Mode Suppression Ratio SMSR 30 --- --- dB
Rise/Fall Time (20−80%) Tr, f--- --- 260 ps
Relative Intensity Noise RIN --- ---
−120 dB/Hz
Total Jitter TJ --- --- 227 ps
Output Eye Compliant with IEEE802.3z
Transmitter Data Input Voltage-High VIH −VCC −1.1 --- −0.74 V Note 1
Transmitter Data Input Voltage-Low VIL −VCC −2.0 --- −1.58 V Note 1
Transmitter Data Input Differential
Voltage VDIFF 0.3 --- 1.6 V Note 1
Note 1: These inputs are compatible with 10K, 10KH and 100K ECL and PECL input.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 4 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Receiver electro-optical characteristics
Vcc = 3.1 V to 5.25 V, TA= 0°C to 70°C
PARAMETER SYMBOL MIN TYP. MAX UNITS NOTE
Optical Input Power-maximum
(BER < 10−12) PIN -3 --- --- dBm
Optical Input Power-minimum
(Sensitivity) (BER < 10−12) PIN --- ---
−24 dBm
Operating Center wavelength
λ
C1460 --- 1620 nm
Optical Return Loss ORL 12 --- --- dB
Signal Detect-Asserted PA--- ---
−24 dBm
Signal Detect-Deasserted PD−35 --- --- dBm
Signal Detect-Hysteresis PA−PD1.0 --- --- dB
Signal Detect Voltage
(LVPECL/PECL)- High VOH −VCC −1.1 --- −0.74 V Note 1
Signal Detect Voltage
(LVPECL/PECL)- Low VOL −VCC −2.0 --- −1.58 V Note 1
Signal Detect Voltage (TTL)-High VOH VCC−0.8 --- Vcc V
Signal Detect Voltage (TTL)-Low VOL 0 --- 0.5 V
Data Output Rise, Fall Time
(20−80%) T r, f --- --- 0.35 ns
Data Output Voltage-High VOH −VCC −1.1 --- −0.74 V Note 1
Data Output Voltage-Low VOL −VCC −2.0 --- −1.58 V Note 1
Data Output Differential Voltage VDIFF 0.3 --- 1.6 V
Note 1 : These outputs are compatible with 10K, 10KH and 100K ECL and PECL input.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 5 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Block Diagram of Transceiver
POST
AMPLIFIER IC
LASER
DRIVER
IC
RRE-
AMPLIFIER
IC
LASER
DATA
DATA/
DATA
DATA/
ELECTRICAL SUBASSEMBLY
OPTICAL
SUB-
ASSEMBLIES
PIN PHOTODIODE
DUPLEX SC
RECEPTACLE
SIGNAL
DETECT
TOP VIEW
Transmitter Section
The transmitter section consists of a 1550 nm InGaAsP laser in an eye safe optical subassembly (OSA) which mates to the
fiber cable. The laser OSA is driven by a LD driver IC which converts differential input LVPECL logic signals into an analog
laser driving current.
Receiver Section
The receiver utilizes an InGaAs PIN photodiode mounted together with a trans-impedance preamplifier IC in an OSA. This
OSA is connected to a circuit providing post-amplification quantization, and optical signal detection.
Receiver Signal Detect
Signal Detect is a basic fiber failure indicator. This is a single-ended LVPECL/PECL ooutput. As the input optical power is
decreased, Signal Detect will switch from high to low (deassert point) somewhere between sensitivity and the no light input
level. As the input optical power is increased from very low levels, Signal Detect will switch back from low to high (assert
point). The assert level will be at least 1.0 dB higher than the deassert level.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 6 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Connection Diagram
Pin-Out
1. RX GND
2. RD+
3. RD
−
4. SD
5. VCCR
6. VCCT
7. TD −
8. TD+
9. TX GND
TOP VIEW
N/C
N/C
PIN SYMBOL DESCRIPTION
1 RX GND Receiver Signal Ground.
Directly connect this pin to the receiver ground plane.
2 RD+RD+ is an open-emitter output circuit.
Terminate this high-speed differential LVPECL/PECL output with standard LVPECL/PECL techniques
at the follow-on device input pin. (See recommended circuit schematic)
3 RD−RD– is an open-emitter output circuit. Terminate this high-speed differential LVPECL/PECL output with standard LVPECL/PECL techniques
at the follow-on device input pin. (See recommended circuit schematic)
4 SD
Signal Detect.
Normal optical input levels to the receiver result in a logic “1” output, VOH, asserted. Low input optical
levels to the receiver result in a fault condition indicated by a logic “0” output VOL, deasserted Signal
Detect is a single-ended LVPECL/PECL output. SD can be terminated with LVPECL/PECL techniques
via 50 Ωto VCCR
− 2 V. Alternatively, SD can be loaded with a 180 Ωresistor to RX GND to conserve
electrical power with small compromise to signal quality. If Signal Detect output is not used, leave it
open-circuited. This Signal Detect output can be used to drive a LVPECL/PECL input on an upstream
circuit, such as, Signal Detect input or Loss of Signal-bar.
5 VCCR Receiver Power Supply.
Provide +3.3 Vdc via the recommended receiver power supply filter circuit. Locate the power supply
filter circuit as close as possible to the VCCR pin.
6 VCCT Transmitter Power Supply.
Provide +3.3 Vdc via the recommended transmitter power supply filter circuit. Locate the power supply
filter circuit as close as possible to the VCCT pin.
7 TD−Transmitter Data In-Bar. Terminate this high-speed differential LVPECL/PECL input with standard LVPECL/PECL techniques at
the transmitter input pin. (See recommended circuit schematic)
8 TD+Transmitter Data In. Terminate this high-speed differential LVPECL/PECL input with standard LVPECL/PECL techniques at
the transmitter input pin. (See recommended circuit schematic)
9 TX GND Transmitter Signal Ground.
Directly connect this pin to the transmitter signal ground plane. Directly connect this pin to the
transmitter ground plane.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 7 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Recommended Circuit Schematic
DC/DC Coupling
1
2
3
4
5
6
7
8
9
RX GND
RD+
RD−
SD
VCCR
TD−
TD+
TX GND
C2
L2
VCC
RiteKom Transceiver
TD+
C1
L1
TD−
VCC
R10 R12R11
R9
RD+
RD −
C3
R1 R3
R2
R4
Laser
Driver
LIMITING
Amplifier
Signal detect
Pre-
Amp
VCCT
ECL/PECL
DRIVER
Serializer/
Deserializer
Receiver
PLL etc.
C4
R5 R6
R7
R8
SD to upper level
R13
C5
C6
C7
C8
C1/C2/C4/C5/C6/C7/C8 = 100 nF C3 = 4.7
µ F L1/L2=1 µ H
R1/R3 = 82ΩR2/R4 = 130 ΩR7/R8 = 180 Ω
R13 = 180 Ω(PECL) R5/R6/R9/R10/R11/R12 Depend on SerDes
AC/AC Coupling
1
2
3
4
5
6
7
8
9
RX GND
RD+
RD−
SD
V
TD−
TD+
TX GND
C2
L2
VCC
RiteKom Transceiver
TD+
C1
L1
TD−
VCC
R6
R8R7
R5
RD+
RD−
C3
Laser
Driver
LIMITING
Amplifier
Signal detect
Pre-
Amp
CCR
VCCT
ECL/PECL
DRIVER
Serializer/
Deserializer
Receiver
PLL etc.
C4
R2 R4
SD to upper level
C5
C6
C7
C8
R
100
R
R
R1
R3
R10
C1/C2/C4/C5/C6/C7/C8 = 100 nF C3 = 4.7
µ F L1/L2 = 1 µ H
R1/R2/R3/R4/R5/R6/R7/R8 Depend on SerDes

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 8 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
In order to get proper functionality, a recommended circuit is provided in above recommended circuit schematic.
When designing the circuit interface, there are a few fundamental guidelines to follow.
(1) The differential data lines should be treated as 50 ΩMicro strip or strip line transmission lines. This will help to minimize
the parasitic inductance and capacitance effects. Locate termination at the received signal end of the transmission line. The
length of these lines should be kept short and of equal length.
(2) For the high speed signal lines, differential signals should be used, not single-ended signals, and these differential signals
need to be loaded symmetrically to prevent unbalanced currents which will cause distortion in the signal.
(3) Multi layer plane PCB is best for distribution of VCC, returning ground currents, forming transmission lines and shielding,
Also, it is important to suppress noise from influencing the fiber-optic transceiver performance, especially the receiver
circuit.
(4) A separate proper power supply filter circuits shown in Figure for the transmitter and receiver sections. These filter
circuits suppress Vcc noise over a broad frequency range, this prevents receiver sensitivity degradation due to VCC noise.
(5) Surface-mount components are recommended. Use ceramic bypass capacitors for the 0.1 µF capacitors and a
surface-mount coil inductor for 1 µH inductor. Ferrite beads can be used to replace the coil inductors when using quieter
VCC supplies, but a coil inductor is recommended over a ferrite bead. All power supply components need to be placed
physically next to the VCC pins of the receiver and transmitter.
(6) Use a good, uniform ground plane with a minimum number of holes to provide a low-inductance ground current return
for the power supply currents.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 9 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Recommended Board Layout Hole Pattern
Unit : mm(inches)
This transceiver is compatible with industry standard wave or hand solder processes. After wash process, all moisture
must be completely remove from the module. The transceiver is supplied with a process plug to prevent contamination during
wave solder and aqueous rinse as well as during handling, shipping or storage.
Solder fluxes should be water-soluble, organic solder fluxes. Recommended cleaning and degreasing chemicals for
these transceivers are alcohol’s (methyl, isopropyl, isobutyl), aliphatics (hexane, heptane) and other chemicals, such as soap
solution or naphtha. Do not use partially halogenated hydrocarbons for cleaning/degreasing.

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 10 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Drawing Dimensions- No Shield
ALL DIMENSIONS ARE±0.20mm UNLESS OTHERWISE SPECIFIED
39.60
25.40
3.30±0.30
20.32
20.32
2.54±0.10
9.50±0.15
0.40±0.10
0.45±0.10
20.3216.28
2.00±0.10
4.75±0.10
12.70±0.15
1.30±0.15
Unit: mm

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 11 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Drawing Dimensions- Forward Shield
ALL DIMENSIONS ARE±0.2mm UNLESS OTHERWISE SPECIFIED
12.70±0.15
25.7±0.25
29.60±0.40
16.28
25.40±0.25
1.30±0.15
9.50
20.32
20.32
20.32 0.4±0.1 9.60
2.54±0.1
4.75±0.10
39.80±0.25
3.3±0.3
36.20±0.25
1.00
Unit: mm

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 12 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Drawing Dimensions- Backward Shield
ALL DIMENSIONS ARE±0.20mm UNLESS OTHERWISE SPECIFIED
3.30±0.30
4.75±0.10
12.70±0.15
1.30±0.15
9.600.40
20.32
2.54±0.10
20.32
0.45±0.10 25.70±0.25
3.50
1.30
29.50±0.40
9.50
20.3216.28
25.40±0.25
39.80±0.25
Unit: mm

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 13 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Optical Receptacle Cleaning Recommendations
All fiber stubs inside the receptacle portions were cleaned before shipment. In the event of contamination of the
optical ports, the recommended cleaning process is the use of forced nitrogen. If contamination is thought to have remained,
the optical ports can be cleaned using a NTT international Cletop®stick type and HFE7100 cleaning fluid. Before the mating
of patchcord, the fiber end should be cleaned up by using Cletop®cleaning cassette.
Cleaning of patchcord Cleaning of fiber stub
1. Insert
Ensure that stick is held straight when inserting into
sleeve.
2. Load
Apply sufficient pressure (approx 600-700g) to ensure
ferrule a little depressed in sleeve.
3.Rotate
Rotate stick clockwise 4-5 times, while ensuring direct
contact with ferrule end-face is maintained.
Notice: Number of possible wipes: Maintenance (repair)
~1 use / piece
Equipment construction: 4 uses / piece (max.)
Note: The pictures were extracted from NTT-ME website.And the Cletop®is a trademark registered by NTT-ME
Module

RoHS compliant
CWDM 1550 nm Single-mode Transceiver (24dB margin)
1×9, SC Duplex Connector, 3.3 V/5V
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Page 14 of 14
Version 1.1
Date:1/30/2006
Headquarters :
12 Shyr Jiann Road, Hsinchu Industrial Park, Hukow,
Hsinchu Hsien,, Taiwan 303
TEL: [phone]
FAX: [phone]
Website: www.apacoe.com.tw
Eye Safety Mark
The LS4 series Single-mode transceiver is a class 1 laser
product. It complies with EN 60825-1 and FDA 21 CFR
1040.10 and 1040.11. In order to meet laser safety
requirements the transceiver shall be operated within the
Absolute Maximum Ratings.
Caution
All adjustments have been done at the factory before
the shipment of the devices. No maintenance and user
serviceable part is required. Tampering with and
modifying the performance of the device will result in
voided product warranty.
Required Mark
Note : All information contained in this document is subject to change without notice.
Class 1 Laser Product
Complies with
21 CFR 1040.10 and 1040.11