Wavelength Electronics LDTC2/2E, Datasheet And Operating Manual

© 2018

www.teamWavelength.com

4

LDTC2/2 LASER DIODE DRIVER AND TEMPERATURE CONTROLLER

PIN DESCRIPTIONS

Table 1.   Pin Descriptions and Wire Colors

PIN

NAME

CABLE 

COLOR

PIN DESCRIPTION

Connector J1 – WCB300

1 (VDD)

Supply Voltage to Control 

Electronics and Laser 

Diode

Red

C5 to +12 V between Pins 1 & 3 to power the control electronics 

and the output drive to the laser diode. Reference the 

Safe Operating 

Area Calculator

.

2 (VS)

Supply Voltage to Output 

TEC Drive

White

C5 to +28 V between Pins 2 & 3 to drive the TEC output stage. 

Reference the 

Safe Operating Area Calculator

.

3 (GND)

Power Supply Ground 

Black

Connect power supply ground to this pin.

Connector J2 – WCB309

1 (COM)

Common

Tan

Low current GND for monitors, DACs, External VSET, etc.

PIN 1 not available on Rev. A

2 (PD MON)

PD Monitor in CC mode

Pink

Photodiode Monitor in Constant Current mode.

PIN 2 not available on Rev. A

3 (LD SHD)

LD Shutdown/Interlock 

(TTL-Compatible)

Grey

Float or GND = Enable Laser Diode Current

Input > 3 V = Disable Laser Diode Current

4 (COM)

Common

Violet

Low current GND for monitors, DACs, External VSET, etc.

5 (R LD SET)

Remote Laser Diode 

Setpoint/Modulation Input Yellow

Voltage Input range is 0 to 2 V. Transfer function is given in 

Table 2

.

6 (COM)

Common

Orange

Low current GND for monitors, DACs, External VSET, etc.

7 (LD P MON)

Photodiode Monitor

Blue

Monitor the laser diode power. This pin produces a voltage proportional 

to the current produced by the laser diode monitor photodiode. See 

Table 2

 for the transfer function.

8 (LD I MON)

LD Current Monitor

Brown

Monitor the laser diode forward current. This pin produces a voltage 

proportional  to  the  current  flowing  through  the  laser  diode.  See 

Table 2

 for the transfer function

9 (ACT T MON)

Actual Temperature 

Monitor

Green

Monitor the actual voltage produced by the temperature sensor. The 

voltage produced and transfer function to temperature is determined 

by the sensor chosen.

10 (SET T MON) Setpoint Monitor

Red

Monitor the temperature setpoint voltage. The voltage produced and 

transfer function to temperature is determined by the sensor chosen.

11 (R TC SET)

Remote Temperature 

Setpoint

White

Connect a voltage source between Pin 11 and Pin 12 to control the 

temperature setting remotely. A default value of 1 V (approximately 25°C 

with a 10 kΩ thermistor) will be seen by the WTC if the voltage at this 

pin drops below 0.3 V.

12 (COM)

Common

Black

Low current GND for monitors, DACs, External VSET, etc.

Connector J3 – WCB301

1 (LDC)

Laser Diode Cathode

Black

Laser diode cathode connection.

2 (PDA)

Photodiode Anode

White

Photodiode anode connection.

3 (PDC)

Photodiode Cathode

Blue

Photodiode cathode connection.

4 (LDA)

Laser Diode Anode

Red

Laser diode anode connection.

5 (COM)

Common

Green

Low current GND for monitors, DACs, External VSET, etc.

6 (TEC+)

TEC+ Connection

Red/Black

Cooling current flows from this pin when using an NTC sensor.

7 (TEC-)

TEC- Connection

Orange

Heating current flows from this pin when using an NTC sensor.

8 (SEN+) 

[1]

Temperature

White/Black

Positive side of temperature sensor. Bias current is driven from SEN+ 

to SEN-.

9 (SEN-) 

[1]

Temperature Sensor-

Orange/Black

Ground connection for the temperature sensor. Refer to Specifications 

table for input voltage range and damage thresholds.

10 (COM)

Common

Green/Black

Low current GND for monitors, DACs, External VSET, etc.

[1]

 See 

page 14

 for additional information regarding the use of RTDs, AD590, and LM335 sensors with the LDTC2/2.