AIU - Analog Interface Unit
The Analog Interface Unit (AIU) is designed to facilitate the interaction between a computer's parallel port and external analog devices, providing both analog-to-digital conversion (ADC) and digital-to-analog conversion (DAC) capabilities. The circuit employs an 8-bit resolution, enabling the sampling and generation of analog signals with a maximum of 256 discrete levels.
The AIU operates using power derived directly from the parallel port, which simplifies its integration with standard PC hardware. This power source is sufficient to support the necessary circuitry, eliminating the need for external power supplies. The input impedance of the AIU is specified at 1 MΩ, which is conducive to interfacing with a variety of sensors and analog sources without significantly loading them down.
One of the notable features of the AIU is its software-selectable input and output voltage ranges. Users can choose between ±1.25V and ±2.5V ranges, allowing flexibility based on the requirements of the connected devices. This feature is particularly useful in applications where different signal levels may be encountered, ensuring that the AIU can accommodate a wide range of input voltages while maintaining accuracy and preventing signal clipping.
The circuit typically includes an 8-bit ADC, which samples the incoming analog signals and converts them into digital data that can be processed by the computer. Conversely, the DAC component of the AIU takes digital signals from the computer and converts them back into analog form, enabling output to external devices.
Overall, the AIU serves as a versatile and accessible solution for interfacing analog signals with digital systems, making it a valuable tool for various applications in data acquisition, signal processing, and control systems.The Analog Interface Unit (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software control.
Here are some of the features : 8-bit ADC and DAC Powered from the parallel port 1Mohm input impeadance. Software selectable +/-1.25V or +/-2.5V input and output ranges.
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