The ILX Lightwave CSM-39400 is a 4-channel laser diode current source module designed for integration into the LDC-3900 Laser Diode Controller mainframe. Each channel delivers independent, precision-controlled current to laser diodes with output ranges from 0 to 4000 mA and setpoint accuracy of ±0.1% of full scale. The module operates in both constant current and constant power modes, accommodating diverse laser diode driving requirements while protecting sensitive components through integrated safeguard circuitry.
## Technical Specifications
**Drive Current Output**
• Output current range: 0 to 4000 mA
• Setpoint resolution: 100 µA
• Setpoint accuracy: ±0.1% FS
• Compliance voltage: 5 V
• Temperature coefficient: < 100 ppm/°C
• Short-term stability (1 hr): < 20 ppm
• Long-term stability (24 hr): < 40 ppm
• Output noise/ripple: < 20 µA
**Current Limit Settings**
• Range: 0 to 4000 mA
• Resolution: 16 mA
• Accuracy: ±40 mA
**Photodiode Feedback (Transimpedance)**
• Photodiode current range: 0 to 20 mA
• Current resolution: 1 µA
• Current accuracy: ±0.05% FS
• Output stability: 0.02%
• Reverse bias: 0 to 5 V, adjustable
**Analog Modulation Input**
• Bandwidth (low): 0 to 2 kHz
• Bandwidth (high): 0 to 50 kHz
• Input impedance: 10 kΩ
**Power & Physical**
• Total power output: 20 W (4 A @ 5 V)
• Dimensions: 10 × 8 × 8 in
• Weight: 5 lbs
## Key Features
• Four independent channels with isolated control
• Integrated laser diode protection circuits
• High-resolution current control with 100 µA setpoint steps
• Dual-mode operation: constant current and constant power
• Transimpedance photodiode feedback with 0.05% FS accuracy
• Low noise performance suitable for sensitive optical applications
• Standard analog modulation input for external signal control
## Compatibility & Integration
The CSM-39400 installs directly into any of the four module bays on the LDC-3900 mainframe rear panel. Full electrical isolation between modules enables independent operation without cross-talk. Modules are readily interchangeable with other LDC-3900 current source, TEC, or combination modules. Class I equipment (grounded type) rated for indoor use only. Supply voltage fluctuations must not exceed ±10% of nominal.
