APPLICATIONS
l 25GBASE-SR Ethernet
Compliance
l SFF-8472
l SFF-8402
l SFF-8432
l SFF-8431
Ordering information
Part No. |
Bit Rate (Gbps) |
Laser (nm) |
Distance |
Fiber Type |
DDMI |
Connector |
Temp |
ESJMLM85-S10C |
25.78125 |
850 |
70M OM3/100M OM4 |
MMF |
YES |
LC |
0℃~+70℃ |
I. Pin Diagram
Pinout of Connector Block on Host Board
II. Pin Descriptions
Pin |
Symbol |
Name/Description |
Ref. |
1 |
VEET |
Transmitter Ground (Common with Receiver Ground) |
1 |
2 |
TFAULT |
Transmitter Fault. |
2 |
3 |
TDIS |
Transmitter Disable. Laser output disabled on high or open. |
3 |
4 |
SDA |
2-wire Serial Interface Data Line |
4 |
5 |
SCL |
2-wire Serial Interface Clock Line |
4 |
6 |
MOD_ABS |
Module Absent. Grounded within the module |
4 |
7 |
RS0 |
No connection required |
|
8 |
LOS |
Loss of Signal indication. Logic “0” indicates normal operation. |
5 |
9 |
RS1 |
No connection required |
|
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. TFAULT is an open collector/drain output, which is pulled up with a 4.7kΩ – 10kΩ resistor on the host board, but is grounded inside the SFP+ cable plug.
3. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
4. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 2.0V and 3.6V. MOD_ABS pull line low to indicate module is plugged in.
5. LOS is open collector output. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
III. Absolute Maximum Ratings
Parameter |
Symbol |
Min |
Type |
Max |
Unit |
Ref. |
Maximum Supply Voltage |
Vcc |
-0.5 |
|
3.6 |
V |
|
Storage Temperature |
TS |
-40 |
|
85 |
℃ |
1 |
Case Operating Temperature |
TOP |
0 |
|
70 |
℃ |
|
Relative Humidity |
RH |
0 |
|
85 |
% |
2 |
Notes:
1.Limited by the fiber cable jacket, not the active ends.
2.Non-condensing.
IV. Optical Characteristics (TOP = 0°C to 70°C, VCC = 3.3 ± 5% Volts)
Parameter |
Symbol |
Min. |
Typ. |
Max. |
Unit |
Remark |
Transmitter |
||||||
Center Wavelength |
λc |
840 |
850 |
860 |
nm |
|
RMS Spectral Width |
Pm |
|
|
0.6 |
nm |
|
Average Output Power |
Pavg |
-8.4 |
|
2.4 |
dBm |
|
Optical Modulation Amplitude (OMA) |
Poma |
-6.4 |
|
3 |
dBm |
|
Extinction Ratio |
ER |
2 |
|
|
dB |
|
Transmitter Dispersion Penalty |
TDEC |
|
|
4.3 |
dB |
|
Optical Return Loss Tolerance |
TOL |
|
|
12 |
dB |
|
Transmitter OFF Output Power |
POff |
|
|
-30 |
dBm |
|
Transmitter eye mask definition {X1, X2, X3, Y1, Y2, Y3}, Hit ratio 1.5E-3 |
|
{0.3, 0.38, 0.45, 0.35, 0.41, 0.5} |
|
|
||
Receiver |
||||||
Center Wavelength |
λc |
840 |
850 |
860 |
nm |
|
Receiver Stress Sensitivity, OMA |
|
|
|
-5.2 |
dBm |
|
Receiver Sensitivity, Average Power |
|
|
|
-10.3 |
dBm |
|
Receiver Reflectance |
Rfl |
|
|
-26 |
dBm |
|
Loss of Signal Assert |
PA |
-30 |
|
|
dBm |
|
Loss of Signal De-assert |
PD |
|
|
-13 |
dBm |
|
LOS Hysteresis |
PD- PA |
0.5 |
|
|
dB |
|
V. Electrical Characteristics (TOP = 0°C to 70°C, VCC = 3.3 ± 5% Volts)
Parameter |
Symbol |
Min |
Type |
Max |
Unit |
Ref. |
Supply Voltage |
Vcc |
3.135 |
3.3 |
3.465 |
V |
|
Supply Current |
Icc |
|
|
300 |
mA |
|
Transmitter |
||||||
Input differential impedance |
Rin |
|
100 |
|
|
1 |
Differential data input swing |
Vin, pp |
200 |
|
1000 |
mV |
|
Transmit Disable Voltage |
VD |
2 |
|
VCC |
V |
|
Transmit Enable Voltage |
VEN |
Vee |
|
Vee+0.8 |
V |
|
Receiver |
||||||
Differential data output swing |
Vout, pp |
200 |
|
1000 |
mV |
2 |
LOS Fault |
VLOS_fault |
2 |
|
Vcc |
V |
3 |
LOS Normal |
VLOS_norm |
Vee |
|
Vee+0.8 |
V |
3 |
Power Supply Noise Tolerance |
VCCT/VCCR |
Per SFF-8431 Rev 4.1 |
mVpp |
|
Notes:
1. Connected directly to TX data input pins.AC coupling from pins into laser driver IC.
2. Into 100Ω differential termination.
3. Measured with Module Compliance Test Board and OMA test pattern. Use of four 1’s and four 0’s in sequence in the PRBS^9 is an acceptable alternative. SFF-8431 Rev 4.1
VI. Digital Diagnostic Memory Map
VII. Digital Diagnostic Monitoring Information
Parameter |
Unit |
Accuracy |
Case Temperature |
℃ |
±3 |
Supply Voltage |
V |
±3% |
Tx Bias Current |
mA |
±10% |
Tx Optical Power |
dB |
±3 |
Rx Optical Power |
dB |
±3 |
VIII.Recommended Interface Circuit
IX. Mechanical Dimensions
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