Analog Input is the process of quantifying continuous varying signals, converting analog signals into digital data using an Analog-to-Digital Converter (ADC), and uploading this data to a computer. This functionality is widely used in Data Acquisition Devices (DAQ). When considering relevant parameters for analog inputs in a DAQ system, the main focus lies on the number of channels, sampling rate, resolution, and range.
Number of Channels
5kSa/s Sampling Rate
10kSa/s Sampling Rate
20kSa/s Sampling Rate
50kSa/s Sampling Rate
The resolution of an analog-to-digital converter is defined as the number of bits used to represent the analog signal. The higher the resolution, the more segments into which the signal range is divided, thereby enabling detection of smaller voltage changes.
Take a 16-bit analog input as an example, when operating within a ±5V range, the distinguishable voltage will be: (5 * 2) / 65536 (2^16) = 15.27 μV.
The following set of graphs shows the time-domain waveform of a sine wave sampled with different resolutions in the range of 0 to 1.
The range represents the minimum and maximum voltage values that the analog-to-digital converter can quantify. Many versatile data acquisition devices by Smacq allow users to select different ranges, even setting different ranges for different channels. This flexibility allows users to match the signal range to the ADC’s input range, fully utilizing the measurement resolution.