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DS1862
Technical data
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MAXIM DS1862 Technical data

General Description
The DS1862 is a closed-loop laser-driver control IC with built-in digital diagnostics designed for XFP MSA. The laser control function incorporates average power con­trol (APC) and allows extinction ratio control though a temperature indexed look-up table (LUT). The DS1862 monitors up to seven analog inputs, including tempera­ture and monitor diode (MD) current, which are used to regulate the laser bias current and extinction ratio. Warning and alarm thresholds can be programmed to generate an interrupt if monitored signals exceed toler­ance. Calibration is also provided internally using inde­pendent gain and offset scaling registers for each of the monitored analog signals. Settings such as pro­grammed calibration data are stored in password-pro­tected EEPROM memory. Programming is accomplished through an I
2
C-compatible interface, which can also be
used to access diagnostic functionality.
Applications
Laser Control and Monitoring 10Gbps Optical Transceiver Modules (XFP)
Laser Control and Monitoring
Digital Diagnostics in Optical Transmission
Features
♦ Implements XFP MSA Requirements for Digital
Diagnostics, Serial ID, and User Memory
♦ I2C-Compatible Serial Interface
♦ Automatic Power Control (APC)
♦ Extinction Ratio Control with Look-Up Table
♦ Seven Monitored Channels for Digital Diagnostics
(Five Basic Plus Two Auxiliary)
♦ Internal Calibration of Monitored Channels
(Temp, V
CC2/3
, Bias Current, Transmitted, and
Received Power)
♦ Programmable Quick-Trip Logic for Turning
Off Laser for Eye Safety
♦ Access to Monitoring and ID Information
♦ Programmable Alarm and Warning Thresholds
♦ Operates from 3.3V or 5V Supply
♦ 25-Pin CSBGA, 5mm x 5mm Package
♦ Internal or External Temperature Sensor
♦ -40°C to +100°C Operating Temperature Range
♦ One 8-Bit Buffered DAC
DS1862
XFP Laser Control and Digital Diagnostic IC
______________________________________________
Maxim Integrated Products
1
Pin Configuration
Rev 1; 12/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+
Denotes lead-free package.
Ordering Information
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
A
B
C
D
E
1
2345
CSBGA (5mm x 5mm)
PART TEMP RANGE PIN-PACKAGE
DS1862B -40°C to +100°C 25 CSBGA (5mm x 5mm)
DS1862B+ -40°C to +100°C 25 CSBGA (5mm x 5mm)
DS1862
XFP Laser Control and Digital Diagnostic IC
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(V
CC3
= +2.9V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Voltage on Any Open-Drain Pin
Relative to Ground.............................................-0.5V to +6.0V
Voltage on MOD-DSEL, SDA, SCL, FETG, THRSET, TX-D,
AUX1MON, AUX2MON, IBIASMON, RSSI, BIASSET, MODSET, EN1,
and EN2 ............-0.5V to (V
CC3
+ 0.5V), not to exceed +6.0V
Voltage on SC-RX-LOS, SC-RX-LOL, RX-LOS, SC-TX-LOS,
MOD-NR, EN1,
and EN2 ............-0.5V to (V
CC2
+ 0.5V), not to exceed +6.0V
Operating Temperature Range .........................-40°C to +100°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...................See J-STD-020 Specification
Main Supply Voltage V
Secondary Supply Voltage V
High-Level Input Voltage (SDA, SCL)
Low-Level Input Voltage (SDA, SCL)
High-Level Input Voltage (TX-D, MOD-DESEL, P-DOWN/RST) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC3
CC2
V
V
V
(Note 1) +2.9 +5.5 V
V
not to exceed V
CC2
IIH (max) = 10µA
IH
IIL (max) = -10µA
IL
IIH (max) = 10µA 2
IH
(Note 2) +1.6 +3.6 V
CC3
0.7 x
V
CC3
GND -
0.3
V
CC3
0.3 x V
V
CC3
+
0.5
CC3
+
0.3
V
V
V
Low-Level Input Voltage (TX-D, MOD-DESEL, P-DOWN/RST) (Note 3)
V
IIL (max) = -10µA -0.3 +0.8 V
IL
DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
DC ELECTRICAL CHARACTERISTICS—INTERFACE SIGNALS TO SIGNAL CONDITIONERS
(V
CC2
= +1.6V to +3.6V, V
CC3
= +2.9V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
High-Level Output Voltage (FETG)
CC3
V
OH
P-DOWN/RST = 1 3 5 mA
V
-
IOH (max) = -2mA
CC3
0.5
V
Low-Level Output Voltage (MOD-NR, INTERRUPT, SDA,
V
OL
IOL (max) = 3mA 0 0.4 V
and FETG)
Resistor (Pullup) R
I/O Capacitance C
Leakage Current I
Leakage Current (SCL, SDA) I
PU
I/O
L
L
(Note 4) 10 pF
91215kΩ
-10 +10 µA
-10 +10 µA
Digital Power-On Reset POD 1.0 2.2 V
Analog Power-On Reset POA 2.0 2.6 V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
High-Level Input Voltage (SC-RX-LOS, SC-RX-LOL, and SC-TX-LOS)
V
IIH (max) = 100µA
IH
0.7 x
V
CC2
V
CC2
0.1
+
V
Low-Level Input Voltage (SC-RX-LOS, SC-RX-LOL, and SC-TX-LOS)
High-Level Output Voltage (EN1 and EN2)
Low-Level Output Voltage (EN1, EN2, and RX-LOS)
Leakage Current (SC-RX-LOS, SC-RX-LOL and SC-TX-LOS, RX-LOS)
0.3 x V
CC2
0.40
V
V
V
V
V
OH2
OH3
V
IL
OH
OL
OL2
I
L
IIL (max) = -100µA 0
V
-
V
V
CC2
0.2
CC2
0.4
CC2
0.2
-
-
IOH (max) = -0.7mA
V
= 2.5V to 3.6V
CC2
I
(max) = -2mA
OH
V
= 1.6V
CC2
I
(max) = -0.7mA
OH
IOL (max) = 0.7mA 0.20
V
= 2.5V to 3.6V
CC2
(max) = 2mA
I
OL
-10 +10 µA
V
V
V
DS1862
XFP Laser Control and Digital Diagnostic IC
4 _____________________________________________________________________
I2C AC ELECTRICAL CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)
ANALOG OUTPUT CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCL Clock Frequency f
Clock Pulse-Width Low t
Clock Pulse-Width High t
Bus Free Time between STOP and START Conditions
Start Hold Time t
Start Setup Time t
Data in Hold Time t
Data in Setup Time t
Rise Time of Both SDA and SCL Signals
Fall Time of Both SDA and SCL signals
STOP Setup Time t
MOD-SEL Setup Time t
MOD-SEL Hold Time t
Aborted Sequence Bus Release t
C ap aci ti ve Load for E ach Bus Li ne C
EEPROM Write Time t
SCI
LOW
HIGH
t
BUF
HD:SDA
SU:SDA
HD:DAT
SU:DAT
t
R
t
F
SU:STO
H os t_sel e ct_set up
Host_select_hold
MOD-DE SEL _Ab ort
B
W
(Note 5)
(Note 5)
(Note 5) 400 pF ≤ 4-Byte write (Note 6) 16 ms
0 400 kHz
1.3 µs
0.6 µs
1.3 µs
0.6 µs
0.6 µs
0 0.9 µs
100 ns
20 +
0.1C
B
20 +
0.1C
B
0.6 µs
2ms
10 µs
300 ns
300 ns
2ms
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
BIASSET
I I I Voltage on I V V V
(Off-State Current) I
BIASSET
MODSET
MODSET
(Off-State Current) I
and I
BIASSET
THRSET
Drift Across temperature (Note 8) -5 +5 %
THRSET
Capacitance load C
THRSET
APC Calibration Accuracy +25°C 25 µA
APC Temp Drift
I
DNL
BMD
I
INL
BMD
I
Voltage Drift 1.2 %/V
BMD
I
FS Accuracy 1.5 %
BMD
I
BIASSET
Shutdown ±10 ±100 nA
Shutdown ±10 ±100 nA (Note 7) 0.7 3.0 V
= 100µA 50 1000 mV
MODSET
BIASSET
I
MODSET
MODSET
V
MAX
V
THRSETIMAX
THRSET
0.200mA to 1.5mA -5 +5 % 50µA to 200µA 12 µA Sink, SRC_SNK_B = 0 -0.9 +0.9 Source, SRC_SNK_B = 1 -0.9 +0.9 Sink, SRC_SNK_B = 0 -4.0 +4.0 Source, SRC_SNK_B = 1 -4.0 +4.0
0.01 1.50 mA
0.01 1.20 mA
1nF
LSB
LSB
DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________ 5
AC ELECTRICAL CHARACTERISICS—XFP CONTROLLER
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
ANALOG OUTPUT CHARACTERISTICS (continued)
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
MODSET
Accuracy
+25°C I
MODSET
= 0.04mA to 1.2mA
75µA range -0.9 +0.9 150µA range -0.9 +0.9
I
MODSET
DNL
300µA range -0.9 +0.9 600µA range -0.9 +0.9 1200µA range -0.9 +0.9 75µA range -1.5 +1.5 150µA range -1.5 +1.5
I
MODSET
INL
300µA range -1.0 +1.0 600µA range -1.0 +1.0
1200µA range -1.0 +1.0 I I I APC Bandwidth IMD / I
Temp Drift 5%
MODSET
Voltage Drift 1.2 %/V
MODSET
FS Accuracy 1.5 %
MODSET
= 1 (Note 4) 6 10 30 kHz
APC
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Time to Initialize t
TX-D Assert Time t
TX-D Deassert Time t
P-DOWN/RST Assert Time t
P-DOWN/RST Deassert Time t
MOD-DESEL Deassert Time t
INTERRUPT Assert Delay t
INTERRUPT Deassert Delay t
MOD-NR Assert Delay t
MOD-NR Deassert Delay t
RX-LOS Assert Time t
RX-LOS Deassert Time t
P-DOWN/RST Reset Time t
Shutdown Time t
V
INIT
OFF
ON
PDR-ON
PDR-OFF
MOD-DESEL
INT-ON
INT-OFF
MOD-NR-ON
MOD-NR-OFF
LOS-ON
LOS-OFF
RESET
FAULT
within ±5% of nominal 30 200 ms
CC3
IBIAS and IMOD below 10% of nominal 5 µs
IBIAS and IMOD above 90% of nominal 1 ms
IBIAS and IMOD below 10% of nominal 100 µs
IBIAS and IMOD above 90% of nominal 200 ms
Time until proper response to I2C communication
Time from fault to interrupt assertion 100 ms
Time from read (clear flags) to interrupt deassertion
Time from fault to MOD-NR assertion 0.5 ms
Time from read (clear flags) to MOD-NR deassertion
Time from SC-RX-LOS assertion to RX-LOS assertion
Time from SC-RX-LOS deassertion to RX-LOS deassertion
Time from P-DOWN/RST assertion to initial reset
Time from fault to I and I
below 10%
BMD
BIASSET
, I
MODSET
-1.5 +1.5 %
LSB
LSB
2ms
500 µs
0.5 ms
100 ns
100 ns
10 µs
,
30 µs
DS1862
XFP Laser Control and Digital Diagnostic IC
6 _____________________________________________________________________
AC ELECTRICAL CHARACTERISICS—SOFT* CONTROL AND STATUS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
*
All SOFT timing specifications are measured from the falling edge of “STOP” signal during I2C communication.
ANALOG INPUT CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)
A/D INPUT VOLTAGE MONITORING (IBIASMON, AUX2MON, AUX1MON, RSSI, BMD)
(V
CC3
= +2.9V to +5.5V, TA= -40°C to +100°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Soft TX-D Assert Time t
Soft TX-D Deassert Time t
Soft P-DOWN/RST Assert Time t
Soft P-DOWN/RST Deassert Time t
Soft MOD-NR Assert Delay
Soft MOD-NR Deassert Delay
Soft RX_LOS Assert Time t
Soft RX_LOS Deassert Time t
Analog Parameter data Ready (DATA-NR)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
Configurable Source or
BMD
Sink (+/-)
I
Voltage (I
BMD
I
Input Resistance R
BMD
- 0µA) V
BMD
OFF_Soft
ON_Soft
PDR-ON_Soft
PDR-OFF_Soft
t
MOD-NR-ON
_Soft
t
MOD-NR-OFF
_Soft
LOS-ON_Soft
LOS-OFF_Soft
BMD
BMD
IBIAS and IMOD below 10% of nominal 50 ms
IBIAS and IMOD above 90% of nominal 50 ms
IBIAS and IMOD below 10% of nominal 50 ms
IBIAS and IMOD above 90% of nominal 200 ms
Time from fault to MOD-NR assertion 50 ms
Time from read (clear flags) to MOD-NR deassertion
Time from SC-RX-LOS assertion to RX-LOS assertion
Time from SC-RX-LOS deassertion to RX-LOS deassertion
Source mode 2.0
Sink mode
I
range 0 to 1.5mA
BMD
0.05 1.50 mA
1.2
400 550 700 Ω
50 ms
50 ms
50 ms
500 ms
V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Resolution ΔV Supply Resolution ΔV
Input/Supply Accuracy A
Update Rate
Input/Supply Offset V
Full-Scale Input (I RSSI)
Full-Scale Input (AUX1MON, AUX2MON, and V
BMD (Monitor) (TX-P) FS setting 1.5 mA
BIASMON
CC2/3
and
)
MON
CC2/3
CC
t
FRAME1
t
FRAME2
OS
At factory setting 0.25 0.5 %FS
AUX1MON and AUX2MON disabled 48 52
All channels enabled 64 75
(Note 4) 0 5 LSB
At factory setting 2.4875 2.5 2.5125 V
At factory setting
(Note 9)
6.5208 6.5536 6.5864 V
610 µV
1.6 mV
ms
DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________ 7
FAST ALARMS AND VCCFAULT CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, V
CC2
= +1.6V to +3.6V, TA= -40°C to +100°C, unless otherwise noted.)
Note 1: All voltages are referenced to ground. Current into IC is positive, out of the IC is negative. Note 2: Secondary power supply is used to support optional variable power-supply feature of the XFP module. If V
CC2
is not used,
(i.e., signal conditioners using 3.3V supply) V
CC2
should be connected to the V
CC3
.
Note 3: Input signals (i.e., TX-D, MOD-DESEL, and P-DOWN/RST have internal pullup resistors. Note 4: Guaranteed by design. Simulated over process and 50µA < I
BMD
< 1500µA.
Note 5: C
B
—total capacitance of one bus line in picofarads.
Note 6: EEPROM write begins after a stop condition occurs. Note 7: This is the maximum and minimum voltage on the MODSET and BIASSET pins required to meet accuracy and drift specifi-
cations.
Note 8: For V
THRSET
, offset may be as much as 10mV.
Note 9: This is the uncalibrated offset provided by the factory; offset adjustment is available on this channel. Note 10: % FS refers to calibrated FS in case of internal calibration, and uncalibrated FS in the case of external calibration.
Uncalibrated FS is set in the factory and specified in this data sheet FS (factory). Calibrated FS is set by the user, allowing a change in any monitored channel scale.
Note 11: See the
Monitor Channels
section for more detail or V
CC2
and V
CC3
selection.
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC3
= +2.9V to +5.5V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
HIGHBIAS and TX-P Threshold FS
V
Fault Asserted
CC2/3
Falling Edge Delay
QT Temperature Coefficient -3 +3 %
QT Voltage Coefficient 0.5 %/V
QT FS Trim Accuracy (4.2V, +25°C)
QT Accuracy (Trip) (INL) -2 0 +2 LSB
QT Voltco 0.5 %/V
QT Tempco 1.5 3 %
(Note 10) 2.48 2.5 2.52 mA
↓ V
CC2/3
(Note 11)
75 ms
2.480 2.500 2.520 mA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Endurance (Write Cycle) +70°C 50k Cycles
Endurance (Write Cycle) +25°C 200k Cycles
DS1862
XFP Laser Control and Digital Diagnostic IC
8 _____________________________________________________________________
Timing Diagrams
Figure 1. Power-On Initialization with P-DOWN/RST Asserted and TX-D/SOFT-TX-D Not Asserted
Figure 2. Power-On Initialization with P-DOWN/RST Not Asserted and TX-D/SOFT-TX-D Not Asserted (Normal Operation)
VCC > V
POA
TX-D
P-DOWN/RST
INTERRUPT
I
BIASSET
I
MODSET
READ-FLAGS
RESET-DONE
t
INIT
t
INIT ON
t
INIT OFF
t
PDR-OFF
t
INIT
RESET-DONE
VCC > V
POA
TX-D
READ-FLAGS
P-DOWN/RST
READ-FLAGS
INTERRUPT
I
BIASSET
I
MODSET
RESET-DONE
t
INIT ON
t
INIT
t
INIT OFF
DS1862
XFP Laser Control and Digital Diagnostic IC
_____________________________________________________________________ 9
Timing Diagrams (continued)
Figure 3. TX-D Timing During Normal Operation
Figure 4. Detection of Safety Fault Condition
TX-F
TX-D
I
BIASSET
I
MODSET
t
OFF
t
ON
OCCURRENCE
OF FAULT
FETG
TX-D
I
BIASSET
I
MODSET
t
FAULT
DS1862
XFP Laser Control and Digital Diagnostic IC
10 ____________________________________________________________________
Figure 5. Successful Recovery from Transient Safety Fault Condition Using P-DOWN/RST
Figure 6. Unsuccessful Recovery from Transient Safety Fault Condition
Timing Diagrams (continued)
OCCURRENCE
OF FAULT
t
P-DOWN/RST
FETG
I
BIASSET
I
MODSET
RESET
t
INIT
RESET-DONE
OCCURRENCE
OF FAULT
P-DOWN/RST
FETG
(FETG_POL = 1)
I
BIASSET
I
MODSET
t
FAULT
t
RESET
RESET-DONE
t
FAULT
DS1862
XFP Laser Control and Digital Diagnostic IC
____________________________________________________________________ 11
Figure 7. Monitor Channel Fault Timing
Timing Diagrams (continued)
OCCURRENCE
OF MONITOR
CHANNEL FAULT
INTERRUPT
READ FLAGS
t
INIT_ON
t
INIT_OFF
DS1862
XFP Laser Control and Digital Diagnostic IC
12 ____________________________________________________________________
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
DS1862 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.34.83.3 3.8 4.3
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.0
2.8
SRC_SINK_B = 1
SRC_SINK_B = 0
I
BMD
= 499.479μA
SUPPLY CURRENT vs. TEMPERATURE
DS1862 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
8560-15 10 35
3.0
3.5
4.0
4.5
5.0
5.5
6.0
-40
SRC_SINK_B = 1
SRC_SINK_B = 0
I
BMD
= 499.479μA
V
CC3
= 5.5V, V
CC2
= 1.6V
I
BMD
DRIFT vs. TEMPERATURE
DS1862 toc03
TEMPERATURE (°C)
I
BMD
DRIFT (%)
8560-15 10 35
-2.5
-1.5
-2.0
-1.0
-0.5
0
0.5
1.0
-40
SRC_SINK_B = 1
SRC_SINK_B = 0
I
BMD
= 499.479μA
V
CC3
= 5.5V, V
CC2
= 1.6V
I
BMD
DRIFT vs. SUPPLY VOLTAGE
DS1862 toc04
SUPPLY VOLTAGE (V)
I
BMD
DRIFT (%)
5.23.6 4.4
-1.0
0
-0.2
0.2
-0.6
-0.8
-0.4
0.4
0.6
0.8
1.0
2.8
SRC_SINK_B = 1
SRC_SINK_B = 0
I
BMD
= 499.479μA
I
MODSET
DRIFT vs. TEMPERATURE
DS1862 toc05
TEMPERATURE (°C)
I
MODSET
DRIFT (%)
85-15 10 35 60
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
-40
I
BMD
= 499.479μAV
CC3
= 5.5V, V
CC2
= 1.6V
INTEGRAL NONLINEARITY
OF QUICK TRIPS
DS1862 toc06
CODE (0–255)
ERROR (LSB)
256128
-0.8
-0.2
0
-0.6
-0.4
0.2
0.4
0.6
0.8
0
DIFFERENTIAL NONLINEARITY
OF I
MODSET
DS1862 toc07
CODE (0–255)
ERROR (LSB)
256128
-0.20
-0.05
0
-0.15
-0.10
0.05
0.10
0.15
0.20
0
FSR = 75μA
V
CC3
= 4.2V, V
CC2
= 1.6V
INTEGRAL NONLINEARITY
OF I
MODSET
DS1862 toc08
CODE (0–255)
ERROR (LSB)
256128
-0.20
-0.05
0
-0.15
-0.10
0.05
0.10
0.15
0.20
0
FSR = 75μAV
CC3
= 4.2V, V
CC2
= 1.6V
DS1862
XFP Laser Control and Digital Diagnostic IC
____________________________________________________________________ 13
Pin Description
NAME
DESCRIPTION
Power-Down/Reset Input. This multifunction pin is pulled high internally. See the Power-Down/Reset Pin
section for additional information.
Signal Conditioner Receiver Loss-of-Signal Input. This pin is an active-high input with LVCMOS/LVTTL voltage levels.
Signal Conditioner Receiver Loss-of-Lock Input. This pin is an active-high input with LVCMOS/LVTTL voltage levels.
THRSET
Threshold Set Output. This pin is a programmable voltage source that can be used for Rx signal conditioner.
V
CC2
1.8V Power-Supply Input
RX-LOS
Receiver Loss-of-Signal. This open-drain output indicates when there is insufficient optical power.
SCL
I2C Serial-Clock Input
FETG
FET Gate Output. This pin can drive an external FET gate associated with safety fault disconnect.
RSSI
Received Power Signal Input
MODSET
Modulation Current Output. This pin is only capable of sinking current.
TX-D
Transmit Disable Input. This pin has an internal pullup resistor.
SDA
I2C Serial-Data Input/Output
EN1
Enable 1 Output. Functional control for signal conditioners.
EN2
Enable 2 Output. Functional control for signal conditioners.
BIASSET
Bias Current Output. This pin is only capable of sinking current.
Interrupt. This open-drain output pin indicates a possible operational fault or critical status condition to the
host.
MOD-NR
Indicating Module Operational Fault. Open-drain output. This pin indicates the status of the MOD-NR flag.
Aux1 Monitor Input. This pin can be used to measure any voltage quantity.
Aux2 Monitor Input. This pin can be used to measure any voltage quantity or external temperature sensor.
BMD
Monitor Diode Current Input. This pin is capable of sourcing or sinking current.
GND
Ground
Module Deselect Input. This pin must be pulled low to enable I2C communication. This pin is pulled high
internally.
IBIASMON
Bias Monitor Input. This pin can be used to monitor the voltage across the laser.
Signal Conditioner Transmitter Loss-of-Signal. This pin is an active-high input with LVCMOS/LVTTL
voltage levels.
V
CC3
3.3V or 5V Power-Supply Input
PIN
P-DOWN/RST A1
SC-RX-LOS A2
SC-RX-LOL A3
A4
A5
B1
B2
B3
B4
B5
INTERRUPT D1
AUX1MON D3
AUX2MON D4
MOD-DESEL E2
SC-TX-LOS E4
C1
C2
C3
C4
C5
D2
D5
E1
E3
E5
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