DPD-243LX 1.25Gb/s 1310nm Single-mode SFP Transceiver
Applied to rail transit, expressway, power station, pipe gallery project and wireless wiring project
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Key words: switch
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GENERAL DESCRIP
Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the 1310nm FP laser and the PIN photo-detector .The module data link up to 10KM in 9/125um single mode fiber.
The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.
Features
● Up to 1.25Gb/s data links，up to 10KM
● on 9/125um single mode fiber
● FP laser transmitter and PIN photo-detector
● Duplex LC/UPC type pluggable optical interface
● Metal enclosure, for lower EMI
● RoHS compliant and lead-free
● Compliant with SFF-8472，Support Digital
● Diagnostic Monitoring interface
● Single +3.3V power supply
● Case operating temperature
Commercial: 0°C to +70℃
Extended: -10°C to +80℃
Industrial: -40°C to +85℃
-
Pin
Symbol
Name/Description
NOTE
1
VEET
Transmitter Ground (Common with Receiver Ground)
1
2
TFAULT
Transmitter Fault.
3
TDIS
Transmitter Disable. Laser output disabled on high or open.
2
4
MOD_DEF(2)
Module Definition 2. Data line for Serial ID.
3
5
MOD_DEF(1)
Module Definition 1. Clock line for Serial ID.
3
6
MOD_DEF(0)
Module Definition 0. Grounded within the module.
3
7
Rate Select
No connection required
4
8
LOS
Loss of Signal indication. Logic 0 indicates normal operation.
5
9
VEER
Receiver Ground (Common with Transmitter Ground)
1
10
VEER
Receiver Ground (Common with Transmitter Ground)
1
11
VEER
Receiver Ground (Common with Transmitter Ground)
1
12
RD-
Receiver Inverted DATA out. AC Coupled
13
RD+
Receiver Non-inverted DATA out. AC Coupled
14
VEER
Receiver Ground (Common with Transmitter Ground)
1
15
VCCR
Receiver Power Supply
16
VCCT
Transmitter Power Supply
17
VEET
Transmitter Ground (Common with Receiver Ground)
1
18
TD+
Transmitter Non-Inverted DATA in. AC Coupled.
19
TD-
Transmitter Inverted DATA in. AC Coupled.
20
VEET
Transmitter Ground (Common with Receiver Ground)
1
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
3. Should be pulled up with 4.7k - 10kohms on host board to a voltage between 2.0V and 3.6V.MOD_DEF (0) pulls line low to indicate module is plugged in.
4. This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:
Low (0 – 0.8V): Reduced Bandwidth
(>0.8, < 2.0V): Undefined
High (2.0 – 3.465V): Full Bandwidth
Open: Reduced Bandwidth
5.LOS is open collector output should be pulled up with 4.7k - 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
4. ABSOLUTE MAXIMUM RATING
Parameter
Symbol
Min.
Typ.
Max.
Unit
Note
Storage Temperature
Ts
-40
85
ºC
Relative Humidity
RH
5
95
%
Power Supply Voltage
VCC
-0.5
4
V
Signal Input Voltage
-0.3
Vcc+0.3
V
Receiver Damage Threshold
+5
dBm
5. RECOMMENDED OPERATING ENVIRONMENT
Parameter
Symbol
Min.
Typ.
Max.
Unit
Note
Case Operating Temperature
Tcase
0
70
ºC
commercial
-10
80
extended
-40
85
industrial
Power Supply Voltage
VCC
3.13
3.3
3.47
V
Power Supply Current
ICC
280
mA
Power Supply Noise Rejection
100
mVp-p
100Hz to 1MHz
Data Rate
1250/1250
Mbps
TX Rate/RX Rate
Transmission Distance
10
KM
Coupled Fiber
Single mode fiber
9/125um SMF
6. OPTICAL CHARACTERISTICS
Parameter
Symbol
Min.
Typ.
Max.
Unit
Note
Transmitter
Average Output Power
POUT
-9
-3
dBm
Note (1)
Extinction Ratio
ER
9
dB
Center Wavelength
λC
1270
1310
1360
nm
FP Laser
Spectrum Bandwidth(RMS)
σ
3.5
nm
Transmitter OFF Output Power
POff
-45
dBm
Differential Line Input Impedance
RIN
90
100
110
Ohm
Output Eye Mask
Compliant with IEEE802.3 z (class 1 laser safety)
Receiver
Input Optical Wavelength
λIN
1270
1610
nm
PIN-TIA
Receiver Sensitivity
PIN
-20
dBm
Note (2)
Input Saturation Power (Overload)
PSAT
-3
dBm
Los Of Signal Assert
PA
-22
dBm
Los Of Signal De-assert
PD
-35
dBm
Note (3)
LOS Hysteresis
PA-PD
0.5
2
6
dB
Note (1): Measure at 2^7-1 NRZ PRBS pattern.Note (2): Measured with Light source 1310nm, ER=9dB; BER =<10^-12 @PRBS=2^7-1 NRZ.
Note (3): When SD De-Assert, the RX-LOS output is High-level (fixed).
7. DIGITAL DIAGNOSTIC FUNCTIONS
The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.
The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.
Digital diagnostics for the transceivers are internally calibrated by default. The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified
Parameter
Symbol
Min.
Max
Unit
Note
Temperature monitor absolute error
DMI_Temp
-3
3
°C
Supply voltage monitor absolute error
DMI_VCC
-0.1
0.1
V
Bias current monitor
DMI_Ibias
-10%
10%
mA
Laser power monitor absolute error
DMI_TX
-3
3
dBm
RX power monitor absolute error
DMI_RX
-3
3
dBm
8. ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Min.
Typ.
Max.
Unit
Note
Transmitter
Total Supply Current
ICC
A
mA
Note (1)
Transmitter Disable Input-High
VDISH
2
Vcc+0.3
V
Transmitter Disable Input-Low
VDISL
0
0.8
V
Transmitter Fault Input-High
VTxFH
2
Vcc+0.3
V
Transmitter Fault Input-Low
VTxFL
0
0.8
V
Receiver
Total Supply Current
ICC
B
mA
Note (1)
LOSS Output Voltage-High
VLOSH
2
Vcc+0.3
V
LVTTL
LOSS Output Voltage-Low
VLOSL
0
0.8
V
Note (1): A (TX) + B (RX) = 280mA (Not include termination circuit)
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