LDC
3700C
SeriesLaser Diode
Controllers

Specifications

Product Features

GENERAL
Chassis Ground:
GPIB Connector:
USB Connector:
Power Requirements(50-60Hz):
Size (HxWxD):
Weight:LDC-3714/24C
LDC-3744C
Operating Temperature:
Storage Temperature:Humidity:
Laser Safety Features:
LASER Display Type:TEC Display Type:
Output Connectors
Laser Drive Current:
TEC Control:
External Modulation:
Chassis Ground:

ORDERING INFORMATION
4mm Banana jackIEEE-488
Type B
100-120 VAC (±10%),220–240 VAC (±10%)127mm x 353mm x 345mm
5in x 13.4in x 16.3in
10.2kg (22.5lbs)
11.3kg (25lbs)
0°C to 40°C
–40°C to 70°C
<90% relative, noncondensing
All instruments utilize a
Keyswitch, Interlock and Output
delay (Meets US 21 CFR 1040.10)
5-Digit, Green LED
5-Digit, Green LED
9-pin, D-sub, female
15-pin, D-sub, female
BNC
4mm Banana jack

NOTES
All controllers include ILX model TS-510 calibrated 10k
thermistors. Laser diode mounts and other accessories arealso available. Contact an ILX Lightwave sales engineer for
more information.
LabVIEW® is a registered trademark of National Instruments.

LDC-3714C

Laser Diode Controller(50/100mA Current Source, 32W TEC)
LDC-3724C Laser Diode Controller(200/500mA Current Source, 32W TEC)
LDC-3744C Laser Diode Controller(2000/4000mA Current Source, 32W TEC)
CC-305S
Current Source/Laser Diode Mount Interconnect Cable
CC-306S
Current Source/Unterminated Interconnect Cable
CC-501STE Controller/Unterminated Interconnect Cable
CC-505STE Controller/Laser Diode Mount Interconnect Cable
LNF-320
Low Noise Filter
LDM-4982
DIL Laser Diode Mount
LDM-4982M Mini-DIL Laser Diode Mount with TE-550 Case
Temperature Control
LDM-4984
Butterfly Laser Diode Mount
LDM-4984RF Hi-Frequency Butterfly Laser Diode Mount
LDM-4986
Connectorized Laser Diode Mount
LDM-4407
Temperature-Controlled TO-Can Laser Diode Mount
LDM-4412
Temperature-Controlled Laser Diode Mount with
Collimating Lens
TS-510Calibrated 10k Thermistor
TS-520Uncalibrated 10k Thermistor
TS-523
Uncalibrated 20k Thermistor
TS-525
Uncalibrated 100k Thermistor
TS-530Uncalibrated AD590LH IC Temperature
SensorTS-540Uncalibrated LM335AH IC Temperature
Sensor
TSC-599
RTD Temperature Sensor Converter
RM136
Rack Mounting Kit(LDC-3714C, LDC-3724C, LDC-3744C)
UCA-350
Unipolar Heater Control Adapter
LabVIEW® Instrument Driver

In keeping with our commitment to continuing improvement,
ILX Lightwave reserves the right to change specifications
without notice and without liability for such changes.

Laser diode current source withintegrated 32W temperature controller
Three models available with up to 4A
laser drive current
USB remote interface
GPIB/IEEE-488 remote interface
High stability, low noise laser current
source operating in constant power orconstant current modes.
Analog modulation capability to 1MHz
4-wire laser forward voltage
measurement and adjustable voltage
limit
Temperature controller compatible withthermistor, IC, and RTD temperature
sensors
Temperature stability of ±0.004°C

The LDC-3700C Series Laser Diode Controllers are anindustry-leading family of high performance, microprocessorbased instruments that offer a high stability, low noise
current source with an integrated 32W temperature
controller specifically designed for controlling the current
and temperature of laser diodes. These controllers are
known throughout the industry for their reliability, precision,and ease-of-use.
Three models cover a wide range of low to medium
power laser diode testing and control applications. The
LDC-3714C and 3724C are targeted specifically for precisioncontrol of low to medium power laser diodes with dual range
current sources of 50/100mA and 200/500mA respectively.
For higher power laser diodes, the LDC-3744C provides adual range current source of 2/4A. All three models comewith an integrated 32W temperature controller.
Independent power supplies for laser and TE current
provide clean, isolated power for laser protection andstability. All of ILX Lightwave’s proven laser diode protection
strategies including slow start, adjustable current limit andcompliance voltage, intermittent contact protection, andoutput shorting relays are incorporated into each model.

TE voltage measurement

The LDC-3714C and LDM-4407 mount:
Ideal for precision control of low power
laser diodes.

The LDC-3724C and LDM-4980 mount: An
unbeatable combination for controlling low
to medium power laser diodes.

The Standard for High Performance
Laser Diode Control
For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

REV04. 042209

LDC
3700C
SeriesLaser Diode
Controllers

LDC
3700C
SeriesLaser Diode
Controllers

Remote instrument operation in an R&D or
production environment is available through a
USB or GPIB/IEEE-488 interface. A trigger output
is provided for integration into an automatedmeasurement system where the TTL level output
indicates a current step change for initiationof a measurement. For virtual instrument
programming, LabView® instrument drivers canbe downloaded from the ILX website.

High Stability, Low Noise Laser
Control
Laser diodes act as a gain medium. Small
drive current fluctuations due to noise and drift are
amplified optically. Because of this, a controller
with a low noise and stable output is required toensure stable optical output. The LDC-3700C
Series of controllers make this possible.
Each LDC-3700C Controller offers a precision
16-bit current source with 0.05% accuracy.
Careful attention to design delivers as low as
20ppm stability and 1.5µA of noise so component
measurements can be made with confidence- fast output shut-off - provides an additional levelof protection from intermittent contacts between
the laser diode and the current source. These
protection features all work in conjunction with all
instrument modes of operation, providing worryfree, fail safe control of your laser diode.

A Choice of Laser Current Control
Modes
With the LDC-3700C Series Controllers, you
can easily control the current to your laser diode in
one of three operating modes:
Constant current, low bandwidth Constant current, high bandwidth Constant optical power
The constant current, low bandwidth mode offers
improved laser protection and noise performanceand is optimized for DC operation. This mode
supports external modulation up to 15kHz.
In constant current high bandwidth mode,the output stage supports higher modulation
frequencies up to 1MHz for dithering the laser
current for power and wavelength tuning. For laser
protection, the modulation input is implemented
as a differential input, allowing the modulation
control voltage and laser outputs to use different
grounds.
The constant power mode provides constant
optical power operation of your laser diode by using
the photocurrent from its rear facet photodiodeor from an external photodiode measuring front
facet light in a feedback control loop to the current
source.

Precision Temperature Control
Output Current Stability of the LDC-3700C Series

Fine Tuned for Protection of Your
Laser Diode
The LDC-3700C Controllers provide all of ILX
Lightwave’s laser diode protection features suchas independent current limits, slow start turn-on,
isolated laser and temperature control power
supplies, and adjustable compliance voltage. A
feature not found in most laser diode controllers

The LDC-3700C Series Controllers include an
integrated precision 32W temperature controller
for quick temperature response of the laser diode’s
chip temperature. For precise wavelength control
during component testing, the LDC-3700C Series’
control algorithm maintains temperature with astability of 0.004°C.
Sixteen-bit control and measurement allows you
to set temperature with 0.01°C resolution with ameasurement accuracy of 0.05°C (with a calibrated

sensor). In addition, the LDC-3700C series
supports TEC forward voltage measurement formonitoring the total power consumption of yourlaser diode module.

Wide Temperature Control Range
These controllers offer extended temperature
control from -100°C to 199.9°C with a choiceof thermistor, IC, or RTD temperature sensors.
Temperature can be controlled in one of threemodes: constant temperature, constant sensor,
or constant TE current.

and TEC parameters and modes easily selected or
adjusted through discrete pushbuttons and a rotary
digital encoder.

Save and Recall Instrument Settings
For multiple instrument test configurations, theLDC-3700C Controllers offer a SAVE and RECALL
feature. The SAVE function allows you to store all
the front panel settings for any given instrument
condition. The RECALL function allows you to
retrieve any of the saved conditions at any time. This
saves time in instrument re-configuration for different
production runs or R&D experiments.

Simplify Routine MaintenanceTemperature Control Stability of an LDC-3724C

As an added precaution, if the temperature
sensor or TE module circuit should open during
operation, the laser diode current source output
will be shut off and the appropriate fault indicator
LED will illuminate.
In addition to the normal control modes, the
TEC output of the LDC-3700C Controllers isbounded by a fully independent hardware current
limit to protect the laser diode’s internal TE module.
These limits cannot be exceeded in any mode ofoperation. The controller can also be bounded bya high temperature limit setting.

Ease of Operation
Divided into two sections, TEC and LASER,
the front panel offers quick, easy operation andinformation display without confusing multi-layer
menus. Each bright, 5-digit, green LED display iseasy to read from a distance, even with laser safety
goggles. Each channel is directly addressablefrom the front panel “adjust” section with LASER

The LDC-3700C architecture simplifies routine
maintenance; calibration of the laser current
source and TE controller can be performed via thefront panel or through USB or the GPIB/IEEE-488
interface, without opening the instrument up or
manual adjustments. A calibration mode is enteredthrough unique push button combinations or remotecommands, and all calibration data is easily entered
via the front panel, USB or GPIB. Calibration data
is automatically stored in on-board non-volatilememory.

Put Our Expertise to Work
ILX Lightwave is a recognized world leader in
Laser Diode Instrumentation and Test Systems. Our
products are not only renowned for their reliability,
quality, and value, they’re backed by industryleading after-sales support. For more information
about the LDC-3700C Series Controllers and ourcomplete family of Laser Diode Instrumentation
and Test Systems, call us today or visit us atwww.ilxlightwave.com.

LDC
3700C
SeriesLaser Diode
Controllers

LDC
3700C
SeriesLaser Diode
Controllers

Remote instrument operation in an R&D or
production environment is available through a
USB or GPIB/IEEE-488 interface. A trigger output
is provided for integration into an automatedmeasurement system where the TTL level output
indicates a current step change for initiationof a measurement. For virtual instrument
programming, LabView® instrument drivers canbe downloaded from the ILX website.

High Stability, Low Noise Laser
Control
Laser diodes act as a gain medium. Small
drive current fluctuations due to noise and drift are
amplified optically. Because of this, a controller
with a low noise and stable output is required toensure stable optical output. The LDC-3700C
Series of controllers make this possible.
Each LDC-3700C Controller offers a precision
16-bit current source with 0.05% accuracy.
Careful attention to design delivers as low as
20ppm stability and 1.5µA of noise so component
measurements can be made with confidence- fast output shut-off - provides an additional levelof protection from intermittent contacts between
the laser diode and the current source. These
protection features all work in conjunction with all
instrument modes of operation, providing worryfree, fail safe control of your laser diode.

A Choice of Laser Current Control
Modes
With the LDC-3700C Series Controllers, you
can easily control the current to your laser diode in
one of three operating modes:
Constant current, low bandwidth Constant current, high bandwidth Constant optical power
The constant current, low bandwidth mode offers
improved laser protection and noise performanceand is optimized for DC operation. This mode
supports external modulation up to 15kHz.
In constant current high bandwidth mode,the output stage supports higher modulation
frequencies up to 1MHz for dithering the laser
current for power and wavelength tuning. For laser
protection, the modulation input is implemented
as a differential input, allowing the modulation
control voltage and laser outputs to use different
grounds.
The constant power mode provides constant
optical power operation of your laser diode by using
the photocurrent from its rear facet photodiodeor from an external photodiode measuring front
facet light in a feedback control loop to the current
source.

Precision Temperature Control
Output Current Stability of the LDC-3700C Series

Fine Tuned for Protection of Your
Laser Diode
The LDC-3700C Controllers provide all of ILX
Lightwave’s laser diode protection features suchas independent current limits, slow start turn-on,
isolated laser and temperature control power
supplies, and adjustable compliance voltage. A
feature not found in most laser diode controllers

The LDC-3700C Series Controllers include an
integrated precision 32W temperature controller
for quick temperature response of the laser diode’s
chip temperature. For precise wavelength control
during component testing, the LDC-3700C Series’
control algorithm maintains temperature with astability of 0.004°C.
Sixteen-bit control and measurement allows you
to set temperature with 0.01°C resolution with ameasurement accuracy of 0.05°C (with a calibrated

sensor). In addition, the LDC-3700C series
supports TEC forward voltage measurement formonitoring the total power consumption of yourlaser diode module.

Wide Temperature Control Range
These controllers offer extended temperature
control from -100°C to 199.9°C with a choiceof thermistor, IC, or RTD temperature sensors.
Temperature can be controlled in one of threemodes: constant temperature, constant sensor,
or constant TE current.

and TEC parameters and modes easily selected or
adjusted through discrete pushbuttons and a rotary
digital encoder.

Save and Recall Instrument Settings
For multiple instrument test configurations, theLDC-3700C Controllers offer a SAVE and RECALL
feature. The SAVE function allows you to store all
the front panel settings for any given instrument
condition. The RECALL function allows you to
retrieve any of the saved conditions at any time. This
saves time in instrument re-configuration for different
production runs or R&D experiments.

Simplify Routine MaintenanceTemperature Control Stability of an LDC-3724C

As an added precaution, if the temperature
sensor or TE module circuit should open during
operation, the laser diode current source output
will be shut off and the appropriate fault indicator
LED will illuminate.
In addition to the normal control modes, the
TEC output of the LDC-3700C Controllers isbounded by a fully independent hardware current
limit to protect the laser diode’s internal TE module.
These limits cannot be exceeded in any mode ofoperation. The controller can also be bounded bya high temperature limit setting.

Ease of Operation
Divided into two sections, TEC and LASER,
the front panel offers quick, easy operation andinformation display without confusing multi-layer
menus. Each bright, 5-digit, green LED display iseasy to read from a distance, even with laser safety
goggles. Each channel is directly addressablefrom the front panel “adjust” section with LASER

The LDC-3700C architecture simplifies routine
maintenance; calibration of the laser current
source and TE controller can be performed via thefront panel or through USB or the GPIB/IEEE-488
interface, without opening the instrument up or
manual adjustments. A calibration mode is enteredthrough unique push button combinations or remotecommands, and all calibration data is easily entered
via the front panel, USB or GPIB. Calibration data
is automatically stored in on-board non-volatilememory.

Put Our Expertise to Work
ILX Lightwave is a recognized world leader in
Laser Diode Instrumentation and Test Systems. Our
products are not only renowned for their reliability,
quality, and value, they’re backed by industryleading after-sales support. For more information
about the LDC-3700C Series Controllers and ourcomplete family of Laser Diode Instrumentation
and Test Systems, call us today or visit us atwww.ilxlightwave.com.

LDC
3700C
SeriesLaser Diode
Controllers

LDC
3700C
SeriesLaser Diode
Controllers

Specifications

Product Features

GENERAL
Chassis Ground:
GPIB Connector:
USB Connector:
Power Requirements(50-60Hz):
Size (HxWxD):
Weight:LDC-3714/24C
LDC-3744C
Operating Temperature:
Storage Temperature:Humidity:
Laser Safety Features:
LASER Display Type:TEC Display Type:
Output Connectors
Laser Drive Current:
TEC Control:
External Modulation:
Chassis Ground:

ORDERING INFORMATION
4mm Banana jackIEEE-488
Type B
100-120 VAC (±10%),220–240 VAC (±10%)127mm x 353mm x 345mm
5in x 13.4in x 16.3in
10.2kg (22.5lbs)
11.3kg (25lbs)
0°C to 40°C
–40°C to 70°C
<90% relative, noncondensing
All instruments utilize a
Keyswitch, Interlock and Output
delay (Meets US 21 CFR 1040.10)
5-Digit, Green LED
5-Digit, Green LED
9-pin, D-sub, female
15-pin, D-sub, female
BNC
4mm Banana jack

NOTES
All controllers include ILX model TS-510 calibrated 10k
thermistors. Laser diode mounts and other accessories arealso available. Contact an ILX Lightwave sales engineer for
more information.
LabVIEW® is a registered trademark of National Instruments.

LDC-3714C

Laser Diode Controller(50/100mA Current Source, 32W TEC)
LDC-3724C Laser Diode Controller(200/500mA Current Source, 32W TEC)
LDC-3744C Laser Diode Controller(2000/4000mA Current Source, 32W TEC)
CC-305S
Current Source/Laser Diode Mount Interconnect Cable
CC-306S
Current Source/Unterminated Interconnect Cable
CC-501STE Controller/Unterminated Interconnect Cable
CC-505STE Controller/Laser Diode Mount Interconnect Cable
LNF-320
Low Noise Filter
LDM-4982
DIL Laser Diode Mount
LDM-4982M Mini-DIL Laser Diode Mount with TE-550 Case
Temperature Control
LDM-4984
Butterfly Laser Diode Mount
LDM-4984RF Hi-Frequency Butterfly Laser Diode Mount
LDM-4986
Connectorized Laser Diode Mount
LDM-4407
Temperature-Controlled TO-Can Laser Diode Mount
LDM-4412
Temperature-Controlled Laser Diode Mount with
Collimating Lens
TS-510Calibrated 10k Thermistor
TS-520Uncalibrated 10k Thermistor
TS-523
Uncalibrated 20k Thermistor
TS-525
Uncalibrated 100k Thermistor
TS-530Uncalibrated AD590LH IC Temperature
SensorTS-540Uncalibrated LM335AH IC Temperature
Sensor
TSC-599
RTD Temperature Sensor Converter
RM136
Rack Mounting Kit(LDC-3714C, LDC-3724C, LDC-3744C)
UCA-350
Unipolar Heater Control Adapter
LabVIEW® Instrument Driver

In keeping with our commitment to continuing improvement,
ILX Lightwave reserves the right to change specifications
without notice and without liability for such changes.

Laser diode current source withintegrated 32W temperature controller
Three models available with up to 4A
laser drive current
USB remote interface
GPIB/IEEE-488 remote interface
High stability, low noise laser current
source operating in constant power orconstant current modes.
Analog modulation capability to 1MHz
4-wire laser forward voltage
measurement and adjustable voltage
limit
Temperature controller compatible withthermistor, IC, and RTD temperature
sensors
Temperature stability of ±0.004°C

The LDC-3700C Series Laser Diode Controllers are anindustry-leading family of high performance, microprocessorbased instruments that offer a high stability, low noise
current source with an integrated 32W temperature
controller specifically designed for controlling the current
and temperature of laser diodes. These controllers are
known throughout the industry for their reliability, precision,and ease-of-use.
Three models cover a wide range of low to medium
power laser diode testing and control applications. The
LDC-3714C and 3724C are targeted specifically for precisioncontrol of low to medium power laser diodes with dual range
current sources of 50/100mA and 200/500mA respectively.
For higher power laser diodes, the LDC-3744C provides adual range current source of 2/4A. All three models comewith an integrated 32W temperature controller.
Independent power supplies for laser and TE current
provide clean, isolated power for laser protection andstability. All of ILX Lightwave’s proven laser diode protection
strategies including slow start, adjustable current limit andcompliance voltage, intermittent contact protection, andoutput shorting relays are incorporated into each model.

TE voltage measurement

The LDC-3714C and LDM-4407 mount:
Ideal for precision control of low power
laser diodes.

The LDC-3724C and LDM-4980 mount: An
unbeatable combination for controlling low
to medium power laser diodes.

The Standard for High Performance
Laser Diode Control
For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

REV04. 042209

LDC
3700C
SeriesLaser Diode
Controllers

Specifications1
LASER CURRENT SOURCEMODEL NUMBER
DRIVE CURRENT OUTPUT
Output Current Range:
Setpoint
Resolution:
Accuracy:
Compliance Voltage:
Temperature Coefficient:
Short-Term Stability (one-hour):2
Long-Term Stability (24-hour):3
Noise and Ripple (rms)4
High Bandwidth Mode (rms):
Low Bandwidth Mode (rms):
Transients
Operational:5
1 kV EFT:
Surge:6

LDC-3714C

LDC-3724C

LDC-3744C

0–50mA

0–100mA

0–200mA

0–500mA

0–2000mA

0–4000mA

1µA±0.05% of FS
0–10V adjustable<50ppm/°C<20ppm<40ppm2µA±0.05% of FS
0–10V adjustable<50ppm/°C<20ppm<40ppm4µA±0.05% of FS
0–10V adjustable<50ppm/°C<20ppm<40ppm10µA±0.05% of FS
0–10V adjustable<50ppm/°C<20ppm<40ppm40µA±0.05% of FS
0–10V adjustable<100ppm/°C<20ppm<40ppm80µA±0.05% of FS
0–10V adjustable<100ppm/°C<20ppm<40ppm

<1.5µA<1.5µA<1.5µA<1.5µA

<4µA
<2µA

<4µA
<2µA

<15µA
<10µA

<20µA
<10µA

<2mA
<5mA
<8mA

<2mA
<5mA
<8mA

<3mA
<8mA
<12mA

<3mA
<8mA
<12mA

<4mA
<10mA
<8mA

<4mA
<10mA
<8mA

0–10V
50mV
±2.5%

0–10V
50mV
±2.5%

0–10V
50mV
±2.5%

0–10V
50mV
±2.5%

0–10V
50mV
±2.5%

1–50.5mA
0.25mA±0.5mA

1–101mA
0.5mA±1mA

1–202mA
1mA±2mA

1–505mA
2.5mA±5mA

1–2020mA
10mA
±20mA

1–4040mA
20mA
±40mA

Differential
0–5V adjustable
5 to 5000µA
0.02%±0.05% of FS

Differential
0–5V adjustable
5 to 5000µA
0.02%±0.05% of FS

Differential
0–5V adjustable
5–5000µA
0.02%±0.05% of FS

Differential
0–5V adjustable
5–5000µA
0.02%±0.05% of FS

Differential
0–5V adjustable
5–10,000µA
0.02%±0.05% of FS

Differential
0–5V adjustable
5–10,000µA
0.02%±0.05% of FS

0–10V, 1 k
5mA/V

0–10V, 1 k
10mA/V

0–10V, 1 k
20mA/V

0–10V, 1 k50mA/V

0–10V, 1 k200mA/V

0–10V, 1 k
400mA/V

DC to 1MHz
DC to 15kHz

DC to 1MHz
DC to 15kHz

DC to 1MHz
DC to 15kHz

DC to 1MHz
DC to 15kHz

DC to 250kHz
DC to 10kHz

DC to 250kHz
DC to 10kHz

TTL
13µs
12ms

TTL
13µs
12ms

TTL
13µs
12ms

TTL
13µs
12ms

TTL
13µs
12ms

TTL
13µs
12ms

0–50.000mA
0.001mA±0.05% FS

0–100.00mA
0.002mA±0.05% FS

0–200.00mA
0.01mA±0.05% FS

0–500.00mA
0.01mA±0.05% FS

0–2000.0mA
0.1mA±0.1% FS

0–4000.0mA
0.1mA±0.1% FS

0–5000µA
1µA±2µA

0–5000µA
1µA±2µA

0–5000µA
1µA±2µA

0–5000µA
1µA±2µA

0–10,000µA
1µA
±4µA

0–10,000µA
1µA
±4µA

COMPLIANCE VOLTAGE ADJUST
Range:
Resolution:
Accuracy:

0–10V
50mV
±2.5%

DRIVE CURRENT LIMIT SETTINGS
Range:
Resolution:
Accuracy:

PHOTODIODE FEEDBACKType:
Photodiode Reverse Bias:
Photodiode Current Range:
Output Stability:7
Setpoint Accuracy:

EXTERNAL ANALOG MODULATION
Input:
Transfer Function:
Bandwidth (3dB)8High Bandwidth:
Low Bandwidth:

TRIGGER OUTPUT
Type:
Pulse Width:
Delay:MEASUREMENT (DISPLAY)
Output Current
Range:
Resolution:
Accuracy:
Photodiode Current
Range:
Resolution:
Accuracy:
Photodiode Responsivity
Range:9
Resolution:
Optical Power
Range:
Resolution:
Forward Voltage
Range:
Resolution:
Accuracy:10

0.00–1000.00µA/mW 0.00–1000.00µA/mW
0.01µA/mW
0.01µA/mW

0.00–1000.00µA/mW 0.00–1000.00µA/mW
0.01µA/mW
0.01µA/mW

0.00–1000.00µA/mW 0.00–1000.00µA/mW
0.01µA/mW
0.01µA/mW

0.00–101.00mW
0.01mW

0.00–101.00mW
0.01mW

0.00–505.00mW
0.01mW

0.00–505.00mW
0.01mW

0.00–5050.0mW
0.1mW

0.00–5050.0mW
0.1mW

0.000–10.000V
1mV
±2mV

0.000–10.000V
1mV
±2mV

0.000–10.000V
1mV
±2mV

0.000–10.000V
1mV
±2mV

0.000–10.000V
1mV
±2mV

0.000–10.000V
1mV
±2mV

CURRENT SOURCE NOTES
1
2
3
4
5
6
7
8
9
10

All values after a one-hour warm-up period at room temperature, 25°C.
Over any one-hour period, half-scale output.
Over any 24-hour period, half-scale output.
Measured optically, evaluating noise intensity of a laser diode into a photodetector with 150kHz bandwidth.
Maximum output current transient resulting from normal operational situations (e.g., power on-off, current on-off), as well as accidental situations (e.g., power line plug
removal).
Maximum output current transient resulting from a 1000V power-line transient spike. Tested to ILX Lightwave Technical Standard #LDC-00196.
Maximum monitor photodiode current drift over any 30 minute period. Assumes zero drift in responsivity of photodiode.
50% modulation at mid-scale output. Higher bandwidth is possible with smaller modulation signal.
Responsivity value is user-defined and is used to calculate the optical power.
Four-wire voltage measuerment. Voltage measurement accuracy while driving calibration load. Accuracy is dependent upon load used and length of cable.

LDC
3700C
SeriesLaser Diode
Controllers

LDC
3700C
SeriesLaser Diode
Controllers

Specifications1
TEMPERATURE CONTROLMODEL NUMBER

ALL MODELS

Temperature Control Range:2
Thermistor Setpoint:
Resolution and Accuracy–20°C to 20°C:
20°C to 50°C:
AD590 & LM335 Setpoint4–20°C to 50°C:
Short-Term Stability (one-hour):5
Long-Term Stability (24-hours):6–100°C to 199°C–100°C to 199°C
Resolution Accuracy3
0.1°C±0.2°C
0.2°C±0.2°C

Usable Thermistor Range:
Typical Sensor Output10
AD590 Current Output:

0.1°C±0.1°C±0.004°C or better±0.01°C

RTD (Pt100) Resistance:
User Calibration:

TEC OUTPUT7
Output Type:
Compliance Voltage:
Maximum Output Current:
Maximum Output Power:
Current Noise and Ripple:8
Current Limit
Range:
Setpoint Accuracy:
Control Algorithm:

Bipolar, constant current
source>8V DC
4.0A
32W<1mA rms
0–4A±50mA
Smart Integrator, Hybrid PI

TEMPERATURE SENSOR
Types
Thermistor:
IC Temperature Sensor:
RTD Sensor:9
Thermistor Sensing Current:
Sensor Bias:

2-wire NTC
AD590/LM335
Pt 100/Other 100 RTD
10/100µA
AD590=8V,
LM335=1mA
RTD=0.8mA925–450,000

LM335 Voltage Output:

I(25°C)=298.2µA,
It=1µA/K
V(25°C)=2.73V,
Vt=10mV/K
R(25°C)=109.73
Thermistor=Steinhart-Hart
IC Sensors, RTD=Two-point

TEC MEASUREMENT (DISPLAY)
Range11
Temperature:
10 µA Setting:12–100.0°C to199.9°C
100 µA Setting: –100.0°C to199.9°C
Thermistor Resistance
10 µA Setting:
0.00 to450.00k
100 µA Setting: 0.000 to
45.000k
TE Current:–4.000 to
4.000A
13

Resolution

Accuracy

0.01°C±0.1°C

0.01°C±0.05°C

0.01k

±0.05%

0.001k±0.05%

0.001A±0.04ATEC VOLTAGE MEASUREMENT14
Voltage Range:
Voltage Resolution:
Voltage Accuracy:–10.0 to 10.0V
1mV±30mV15

TEMPERATURE CONTROL NOTES
1 All values relate to a one-hour warm-up period.
2 Software limits of range. Actual range possible depends on
the physical load, thermistor type, and TE moduleused.
3 Accuracy figures are quoted for a typical 10k thermistor
and 100µA current setting. Accuracy figures are relative
to the calibration standard. Both resolution and accuracy are
dependent upon the user-defined configuration of the
instrument.
4 Accuracy depends upon the sensor model selected, the calibration standard, and the user-defined configuration of the
instrument.
5 Over any one-hour period, half-scale output, controlling an
LDM-4412 mount at 25°C, with 10kthermistor, on 100µA
setting.
6 Over any 24-hour period, half-scale output, controlling an
LDM-4412 mount at 25°C, with 10k thermistor, on 100µA
setting.
7 Into a 1 load.

8 Measured at 1A over bandwidth of 10Hz to 10MHz
9 When ordered with TSC599 RTD Temperature Sensor Converter.
10 Nominal temperature coefficients, It and Vt, apply over the
rated temperature sensor range.
11 Software limits of display range.
12 Using a 100k thermistor controlling an LDM-4412 mountover –30°C to 25°C.
13 Using a 10k thermistor, controlling an LDM-4412 mountover 0°C to 90°C.
14 Voltage measurement is available only through USB or the
GPIB inteface.
15 Voltage measurement accuracy while driving calibration load.
Accuracy is dependent upon load use.

In keeping with our commitment to continuing improvement, ILX
Lightwave reserves the right to change specifications without
notice and without liability for such changes.

For information call
P.O. Box 6310, Bozeman, MT 59771 • Fax:(406)586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com
REV04. 042209