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Overview
The Photodiode Light Detector Demo Board showcases how to use a transimpedance amplifier U1 (MCP6021) and external resistors, to convert photocurrent (IP) from a photodiode to an output voltage.
This board has two different circuit implementations, photovoltaic and photoconductive mode.
In the photoconductive topology, the photodetector needs to be reverse biased. Amplifier U2 provides a reverse bias of VDD/2 to the photodetector, where the photodetector's anode is the circuit GND.
In the photovoltaic topology, Amplifier U2 generates a reference voltage of VDD/2 so, that the circuit provides an output that is referenced to VDD/2 and allows an Analog-to-Digital Converter (ADC) to sample the signal with reference to the circuit GND.
- Supports Microchip MCP6021 and MCP6491 high precision operational amplifiers.
- Utilizes a transimpedance amplifier for sensor conditioning.
- On-board transimpedance amplifier (MCP6021)
- Inverting input configuration.
- Supports two different circuit implementations:
- Photovoltaic Mode
- Photoconductive Mode
- Test points available for connecting lab equipment.
- On-Board photodiode connector with two or three pin configurations.
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Documentation
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| EV63G51A - Gerbers | Gerbers | Download | ||
| EV63G51A - Schematic | Schematics | Download | ||
| Photodiode Light Detector Solutions Demo Board User Guide | User Guides | Download | ||
| Using MCP6491 Op Amps for Photodetection Applications | Application Notes | Link | Download | |
| Amplifying High-Impedence Sensors ? Photodiode Example | Application Notes | Link | Download |