Contents
How are conversion errors minimised in an ADC?
UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS Sampling the signal at twice the analog signal frequency will not result in a loss of information. If sampling frequency is less, then the information will be lost. This is a standard theorem that applies to ADCs in general.
Which is the best method for ADC conversion?
The Succes- sive approximation method is the most popular technique. It is also known as Successive ap- proximation Register (SAR) technique. This technique uses binary search method. It consists of a high speed comparator, DAC (digital to analog converter), and control logic.
What is the quantization error for an ADC?
UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS The quantization error is the error introduced because of the process of quantization. Ideally any analog input voltage can be maximum of 1/2 LSB away from its nearest digital code. So the quantization error is 0.5LSB for the ADC.
What is the digital code in an 8 bit ADC?
In an 8-bit ADC, for example, – A unipolar ADC with an input range of 0V to 5V will output the digital code 00h for 0V and FFh for 5V. – A bipolar ADC with an input range of -5V to +5V will output the digital code 00h for -5V, 80h for 0V and FFh for +5V.
What happens when code 10 is missing in ADC?
When the input voltage is swept, Code 10 will be missing. When DNL-error values are offset (that is, -1LSB, +2LSB), the ADC transfer function is altered. Offset DNL values can still in theory have no missing codes. The key is having -1LSB as the low limit.
How is the accuracy of the ADC dependent?
Accuracy of the ADC is dependent on several key specs, which include integral nonlinearity error (INL), offset and gain errors, and the accuracy of the voltage reference, temperature effects, and AC performance.
Do you have to use a 12 bit ADC?
This article explains how to select an ADC based on the system requirements and describes the various sources of error when making an ADC measurement. Using a 12-bit-resolution analog-to-digital converter (ADC) does not necessarily mean your system will have 12-bit accuracy.
What causes an ADC to make an inaccurate measurement?
Some of the more common reasons are: Sometimes the source an ADC is measuring can have a high impedance. This high source impedance can cause a noticeable drop in the measured voltage of the ADC. This can lead to inaccurate measurements. More information on this is available in the Input Impedance section of Specifications Explained: C Series.