DELTA ELECTRONICS, INC.
LC-2488B4H2 Single Mode Laser Small
Form Factor Transceiver for SONET
OC-48 / SDH STM-16
FEATURES
•
Compliant with SFF Transceiver MSA
Specification
•
Compliant with Specifications for SONET OC-48/SDH
STM-16
•
RJ-45 style LC
TM
connector system
•
1310 nm Fabry-Perot Laser Source Technology
•
Data Link up to 2km in 9/125 Signal Mode Fiber
•
Single + 3.3V Power Supply and TTL Logic
Interface
•
2x5 LC SFF small footprint utilized in high density
application
•
Laser Class 1 Product which comply with the
requirements of IEC 60825-1 and IEC 60825-2
Product Description
The LC-2488B4H2 from DELTA ELECTRONIC is a hot
pluggable 3.3V Small Form-Factor transceiver module
designed expressly for high-speed bi-directional communi-
cation applications that require rates of up to 2.488 Gbit/sec.
It is compliant with the SONET OC-48 / SDH STM-16
standards, as well as the SFF Multisource Agreement.
The LC-2488B4H2 transceivers provide with the LC
receptacle that is compatible with the industry standard LC
connector. The transceiver is supplied in the industry
standard 2x5 DIP style and is footprint compatible with SFF
Multi Source Agreement(MSA).
The transmitter section of LC-2488B4H2 consists of an
1310 nm Fabry-Perot (FP) Laser in an optical subassembly
(OSA) while the receiver consists of a GaAs PIN photo -
diode mounted together with a transimpedance preamplifier.
The post-amplifier of the LC-2488B4H2 also includes a
Signal Detect circuit which provides a TTL logic-high
output when an unusable optical signal level is detected.
The LC-2488B4H2 transceiver is a Class 1 eye safety
product.The optical power levels, under normal operation,
are at eye safe level.
ORDERING INFORMATION
LC - 2488 B 4 H 2 X
DATA RATE
WAVE LENGTH
A
850 nm
B
1310 nm
C
1550 nm
SD LEVEL
4
TTL
TEMPERATURE
BLANK
0~70 deg C
H
-10~85 deg C
T
-40~85 deg C
COUPLING TYPE
1
DC / DC
2
AC / AC
LINK DISTANCE
H 2km in 9/125 um SMF
I
5km in 9/125 um SMF
Q
10km in 9/125 um SMF
E
200m in 62.5/125 um MMF,
500m in 50/125 um MMF
F
300m in 62.5/125 um MMF,
550m in 50/125 um MMF
DELTA ELECTRONICS, INC.
LC-2488B4H2 Single Mode Laser Small
Form Factor Transceiver for SONET
OC-48 / SDH STM-16
Absolute Maximum Ratings
Parameter
Supply voltage
Storage temperature
Lead soldering temperature
Lead soldering time
Symbol
Vcc
Ts
T
SOLD
t
SOLD
Min.
-0..5
-40
Typ.
Max.
5
85
240
10
Unit
V
℃
℃
sec.
Note
Recommended Operating Conditions
Parameter
Ambient Operating
Temperature
Supply voltage
Transmitter Differential
Input Voltage
Data Output Load
Symbol
T
A
Vcc
V
D
R
DL
Min.
0
3.15
0.4
Typ.
Max.
70
3.45
1.6
Unit
℃
V
V
Ω
Note
50
E l e c t r i c a l C h a r a c t e r i s t i c s
(T
A
= 0 d e g C t o 7 0 d e g C , V
Parameter
TRANSMITTER
Supply current
RECEIVER
Supply current
Data output differential
voltage
Output Data risetime
Output Data falltime
S i g n a l D e t e c t O u t p u t -H i g h
S i g n a l D e t e c t O u t p u t -L o w
Icc
V
D
t
r
t
f
V
LH
V
LL
2
0
0.5
0.7
Icc
C C
= 3 . 1 5 V
to 3.45V )
Unit
mA
mA
V
ps
ps
Ref 1
Ref 1
Symbol
Min.
Typ.
Max.
160
13 0
1 .2
150
150
3.45
0.8
Note
Notes:
Ref 1. These are 20%~80% values
DELTA ELECTRONICS, INC.
LC-2488B4H2 Single Mode Laser Small
Form Factor Transceiver for SONET
OC-48 / SDH STM-16
Optical Characteristics
(T
A
=0 degC to 70 degC , V
CC
=3.15V to 3.45V )
Parameter
TRANSMITTER
Launched power(avg.)
Optical extinction ratio
Center wavelength
Spectral width(RMS)
Optical risetime
Optical falltime
RECEIVER
Optical input sensitivity(avg.)
Optical input saturation(avg.)
Optical wavelength
Signal detect- Assert
Signal detect- Deassert
Signal detect- Hysteresis
P
IN
P
SAT
λ
P
A
P
D
P
A
-P
D
-30
0.5
4
-3
1310
-18
-18
dBm
dBm
nm
dBm
dBm
dB
Ref 3
Ref 4
λ
c
σ
t
r
t
f
P
O
-10
8.2
1270
1310
1355
4
100
225
-6
-3
dBm
dB
nm
nm (rms)
ps
ps
Ref 2
Ref 2
Ref 1
Symbol
Min.
Typ.
Max.
Unit
Note
Notes:
Ref 1. The maximum optical output power complies with class 1 laser eye safety.
Ref 2. These are unfiltered 20-80% values.
Ref 3. The receive sensitivity is measured using a worst case extinction ratio penalty BER better than or
equal to 1x10
-12
in the center of the eye opening with 2
23
-1 NRZ PRBS
Ref 4. Measured with 2
23
-1 NRZ PRBS
DELTA ELECTRONICS, INC.
LC-2488B4H2 Single Mode Laser Small
Form Factor Transceiver for SONET
OC-48 / SDH STM-16
Connection Diagram
Rx
Tx
Mounting Studs / Soder Posts
Mounting Studs / Soder Posts
Top
View
Receiver Ground
Receiver Power Supply
Signal Detect
Receiver Output Data Bar
Receiver Output Data
1
2
3
4
5
10
9
8
7
6
Transmitter Input Data Bar
Transmitter Input Data
Transmitter Disable
Transmitter Gound
Transmitter Power Supply
Pin Descriptions
Pin Name
Receiver Ground
Receiver Power Supply
Signal Detect
Receiver Output Data Bar
Receiver Output Data
Transmitter Power Spply
Transmitter Gound
Transmitter Disable
Transmitter Input Data
Transmitter Input Data Bar
Pin#
1
2
3
4
5
6
7
8
9
10
Description
Directly connect this pin to the receiver ground plane
Provide +3.3V dc via the recommended receiver power supply
filter circuit.
Receiver Signal Detect TTL output. Active high on this line
indicates a received optical signal
Receiver data inverted differential AC coupled PECL
compatible output
Receiver data non-inverted differential AC coupled PECL
compatible output
Provide +3.3V dc via the recommended transmitter power
supply filter circuit.
Directly connect this pin to the transmitter ground plane
Connect this pin to +3.3V TTL logic high ‘1’ to disable module.
To enable module, connect this pin to TTL logic low ‘0’.
Transmitter data inverted differential AC coupled PECL
compatible input
Transmitter data non-inverted differential AC coupled PECL
compatible input
DELTA ELECTRONICS, INC.
LC-2488B4H2 Single Mode Laser Small
Form Factor Transceiver for SONET
OC-48 / SDH STM-16
Recommended Circuit Schematic :
8
TXDIS
TXGND
Transmitter
TxD
Laser
100R
Driver
TxD
TTL Logic Level
VCC SerDes
3.3V
VCC
7
9
TX+
ECL/
PECL
DRIVER
Serializer/
Deserializer
Transceiver
Chip
10
R6
VCCTx
6
Delta Transceiver
VCCRx
Receiver
Signal detect
2
C1
C2
3
L2
C3
L1
SD to upper level
VCC
3.3V
SD
RxD
R5
TX-
5
R11
R10
R9
RD-
RD+
R12
Pre-
Amp
Post
Amp
RxD
RxGND
4
Receiver
PLL etc.
1
Input Level (LV-TTL)
TX Function
Low
High
NIC
ON
OFF
ON
Table 1
(Disable Pin Truth Table)
C1/2/3
L1/2
= 4.7 uF
= 1 uH
Value of R5/6/9/10/11/12 may vary as long as proper 50
Ω
termination or 100
Ω
differential
Is Provided.For good EMI performance ,the power supply filter is required.Use short tracks from the inductor
L1/2 to the module VccTx/VccRx.
京公网安备 11010802033920号
EEWORLD
