The ILX Lightwave CSM-39800 is an 8 A laser diode current source module engineered for precise, stable control of laser diodes within the ILX Lightwave LDC-3900 Modular Laser Diode Controller mainframe. This module delivers up to 4000 mA of adjustable output current with 100 µA resolution and ±0.1% of full-scale accuracy, supporting both constant current and constant power operation modes. Built-in laser diode protection circuits and electrical isolation from other mainframe modules eliminate ground loop-induced damage. The CSM-39800 is now obsolete but remains suitable for legacy research, development, and production test systems requiring high-precision diode current management.
## Technical Specifications
• **Drive Current Output:** 0–4000 mA with 100 µA setpoint resolution and ±0.1% FS accuracy
• **Drive Current Limiting:** 0–4000 mA range, 16 mA resolution, ±40 mA accuracy
• **Compliance Voltage:** 5 V
• **Photodiode Feedback (Transimpedance):** 0–20 mA input range, 0–5 V adjustable reverse bias, 0.02% output stability, ±0.1% FS setpoint accuracy
• **Stability Performance:** Temperature coefficient <100 ppm/°C; short-term (1 hr) <20 ppm; long-term (24 hr) <40 ppm
• **Bandwidth:** High bandwidth mode DC to 50 kHz; low bandwidth mode DC to 1 kHz
• **Transient Performance:** <5 mA operational, <20 mA power-line induced worst case
## Key Features
• Fully isolated (electrically floating) module architecture prevents laser-damaging ground loops
• Analog modulation input via BNC connector with instrumentation amplifier
• Integrated laser diode protection circuits
• Current source output on 15-pin high-density D-sub connector
• Photodiode input on coaxial BNC connector
• Rear-loading design with pull handle for easy insertion and removal
## Typical Applications
Research and development environments, production testing facilities, and laboratory systems requiring high-precision laser diode biasing and modulation control.
## Compatibility & Integration
Designed exclusively for integration into the ILX Lightwave LDC-3900 Modular Laser Diode Controller mainframe.
