© 2005
PRELIMINARY
LDTC2/2
PAGE 6
LDTC2/2-00400-A Rev A
C5 to +12V between pins 2 & 3 to power the control
electronics and the output drive to the Laser Diode. Use the
ONLINE Safe Operating Area calculator to make sure maximum
internal power dissipation in the WLD is not exceeded - especially
when using greater than +5V.
C5 to +28V between pins 1 & 3 to drive the TEC
output stage - Use the ONLINE Safe Operating Area calculator to
make sure maximum internal power dissipation in the WTC is not
exceeded - especially when using greater than +5V.
Spare connection for your use - test point, etc.
Spare connection for your use - test point, etc.
Float or GND = Enable Laser Diode Current
Input >3V = Disable Laser Diode Current
Low current GND for monitors, DACs, External VSET, etc.
Voltage Input range is 0 to 2V. Transfer function:
V
R LDSET
= I
LD
* (2 R
SENSE
)
Low current GND for monitors, DACs, External VSET, etc.
Monitor the laser diode power. The Photodiode Current Monitor
produces a voltage proportional to the current produced by the
laser diode monitor photodiode.
Monitor the laser diode forward current. The Laser Diode Current
Monitor produces a voltage proportional to the current fl owing
through the laser diode.
Monitor the actual voltage produced by the temperature sensor.
The voltage produced and transfer function to temperature is
determined by the sensor chosen.
Monitor the temperature setpoint voltage. The voltage produced
and transfer function to temperature is determined by the sensor
chosen.
Connect a voltage source between Pin 11 (VSET) and Pin 12
(GND) to control the temperature setting remotely. A default
value of 1V (about room temperature with 10k
Ω
thermistor) will be
seen by the WTC if the voltage at this pin drops below 0.3V.
Low current GND for monitors, DACs, External VSET, etc.
Cooling current fl ows from this pin when using an NTC sensor.
Heating current fl ows from this pin when using an NTC sensor.
Connect resistive and LM335 type temperature sensors across
Pin 8 and Pin 9. Connect a 10 k
Ω
resistor across these pins when
using AD590 type temperature sensors. The negative terminal of
the AD590 sensor connects to Pin 8 and the positive terminal to
Pin 1 (VDD) of Connector 1. AD590 operation requires that VDD
be +8 Volts or greater for proper operation.
Low current GND for monitors, DACs, External VSET, etc.
PIN DESCRIPTIONS
Supply Voltage to Control
Electronics and Laser
Diode
Supply Voltage to Output
TEC Drive
Power Supply Ground
Spare 1
Spare 2
LD Shutdown / Interlock
Common
Remote Laser Diode
Setpoint
Common
Photodiode monitor
LD Current monitor
Actual Temp monitor
Setpoint monitor
Remote Temperature
Setpoint
Common
Laser Diode Cathode
Photodiode Anode
Photodiode Cathode
Laser Diode Anode
Common
TEC + connection
TEC - connection
Temperature
Temperature Sensor -
Common
VDD
VS
GND
SP1
SP2
LD SHD
COM
R LDSET
COM
LD P M
LD I M
ACT T M
SET T M
R TCSET
COM
LDC
PDA
PDC
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM
1
2
3
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
Connector 1 (J1)
Pin
Pin # Name
Function
Connector 2 (J2)
Connector 3 (J3)
