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Analog-to-Digital Converters, ADC

To buy analog-to-digital converters ADC in Ukraine

An analog-to-digital converter is an analog-to-digital converter, or ADC for short. It is a device that converts a continuous analog signal to a discrete digital signal.

ADC sampling rate

Sound (voice) and its transformation.

An analog signal is continuous in the time domain, so it can be converted to a series of continuous digital signals. This requires a parameter definition to indicate the rate of the new digital signal sampled from the analog signal. This frequency is called the sampling rate or the sampling rate of the converter.

It can collect continuously changing signals with limited bandwidth (that is, measure and store the signal value every time), and then restore the converted discrete signal to the original signal through interpolation. The accuracy of this process is limited by the quantization error. However, only when the sampling rate is more than twice the signal frequency can the original signal be accurately reconstructed. This law is reflected in the discretization theorem.

Since the actual A / D converter cannot perform full conversion in real time, some additional techniques need to be used to keep it constant while converting the input signal. A sample and hold scheme is commonly used. In most cases, a capacitor can be used to store the analog input voltage, and a switch or gate circuit can be used to turn the capacitor and the input signal on and off. Many ADCs already include such ​​a sampling and storage subsystem.

ADC digital output selection

  1. High quality hardware provides higher ADC speed, more channels and density. Designers should evaluate the output format of the converter as well as the basic characteristics of the conversion.
  2. The main output options are CMOS (Supplemental Metal Oxide Semiconductor), LVDS (Low Voltage Differential Signaling), and CML (Current Mode Logic).
  3. Issues to consider include: power consumption, transients, data and clock warping, and the ability to suppress noise.
  4. Consideration of layout is also an aspect of conversion output selection, especially when using LVDS technology. When designers have multiple ADC options, they must consider whether the digital output is CMOS (Complementary Metal Oxide Semiconductor), LVDS (Low Voltage Differential Signaling), or CML (Current Mode Logic). Each type of digital output used in an ADC has its own advantages and disadvantages, and developers should consider them in conjunction with their own applications. These factors depend on the ADC sampling rate and resolution, output data rate, system power requirements, and so on.