Low-Noise Current Amplifier (Transimpedance Amplifier) LCA-40k-100M

Features

• Bandwidth: DC–40kHz
• Rise/Fall Time: 10μs
• Gain: 1×10⁸ V/A (@load >10 kΩ)
• Ultra-low noise: equivalent input noise current 20 fA/√Hz

Applications

• Photodiode & photomultiplier tube amplification
• Spectral analysis systems
• Electronic measurement
• Ion detection equipment
• Preamplifier for lock-in amplifiers, ADCs, etc.

Specifications

Test Condition: Vs=±12V, Ta=25℃

Item	Parameters
Gain
Transimpedance Gain	1×10⁸ V/A (@load >10 kΩ)
Gain Accuracy	±3%
Frequency Response
Lower Frequency Limit	DC
Upper Frequency Limit	10kHz (-3dB)
Rise/Fall Time (10–90%)	10μs
Input
Input Noise Current	18fA/√Hz (@10kHz)
Input Noise Voltage	4.0nV/√Hz (@10kHz)
Input Bias Current	2pA typical
Bias Current Compensation	±0.15nA
Maximum Input Current	±100nA
Input Bias Voltage	<2mV
DC Input Impedance	50Ω
Output
Maximum Output Voltage Range	±10V (@load >10 kΩ)
Output Impedance	50Ω (best performance >10 kΩ)
Maximum Output Current	±100mA
Power Supply
Voltage	±12V
Current	±100mA typical
Housing
Weight	105g
Material	6061 Aluminum Alloy
Temperature
Storage Temperature	-40…+85℃
Operating Temperature	-20…+60℃
Absolute Maximum Ratings
Input Voltage	±5V
Supply Voltage	±20V
Connectors
Input	BNC Female
Output	BNC Female
Power Connector	M8 3-pin Female1=Brown(+12V)2=Black(GND)3=Blue(-12V)

Application Diagram

• Photovoltaic mode (photodetector bias): for low-speed, minimum dark current

• Photoconductive mode (photodetector bias): for high-speed applications; bias reduces detector capacitance

Dimension

Delivery List