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QCL500, QCL1000, QCL1500 Low Noise Quantum Cascade Laser Drivers
PAGE 7
QCL1500-00400-D
Reserved
Not used
Return for Remote Power On signal - optically isolated
OFF = LO (< 0.3 V). ON = HI (> 3 V).
Toggle to reset a protection circuit error.
Return for Remote Enable signal - optically isolated
Disable = LO (<0.3 V). Enable = HI (>3 V).
Toggle to reset a protection circuit error.
HI = Current Enabled. LED drive compatible. Source up to 25 mA, 12 V.
HI = Power ON. LED drive compatible. Source up to 25 mA, 12 V.
HI = FAULT triggered. Indicates internal parts are over acceptable
temperature. LED drive compatible. Source up to 25 mA, 12 V.
Monitor Output Current level. 0 to 2.5 V. Transfer functions vary with model.
Monitor Current Limit Setpoint. Output 0 to 5 V. Transfer functions vary with
model.
Monitor Ground - use with Status or Monitors. Not designed for high current
return.
Analog voltage sums with onboard setpoint trimpot - can be positive or
negative (Do not drive negative below the DC level set by onboard setpoint
trimpot or above 5.5 V) Setpoint range 0 to 5 V. Input impedance is 1 k
.
Ground for Analog Input Voltage. Not designed for high current return.
Ground - can be used to ground chassis.
Positive DC power to the unit, typ24 V
Negative DC power to the unit, typically -24 V
GROUND - designed for high current return to the power supplies.
Ground - Source current to QCL (see diagram below)
Sink current from QCL (see diagram below)
No connect
No connect
Remote Power On -
Remote Power On +
Remote Enable -
Remote
QCL Enable Status
Power Status
Overtemp Fault Status
Current Monitor
Limit Monitor
Monitor Ground
ANALOG IN
ANALOG IN GND
Ground
V+
V -
POWER GROUND
QCL + (Ground)
QCL -
FUNCTION
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PIN DESCRIPTIONS (left to right)
QC
Laser
-V
QCL +
QCL -
QCLxxx
Current Sink
Sink current from QCL (see diagram below)
Ground - Source current to QCL (see diagram below)
Ground
Analog voltage sums with onboard setpoint trimpot - can be positive or
negative (Do not drive negative below the DC level set by onboard setpoint
trimpot or above 5.5 V) Setpoint range 0 to 5 V. Input impedance is 1 k
.
Ground for Analog Input Voltage. Not designed for high current return.
QCL -
QCL + (Ground)
Ground
ANALOG IN
ANALOG IN GND
FUNCTION
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
Front Panel Connector (left to right)
Figure 6
QCL wiring polarity and grounding
