Contents
What is the linearity of ADC?
The differential nonlinearity error shown in Figure 5 (sometimes seen as simply differential linearity) is the difference between an actual step width (for an ADC) or step height (for a DAC) and the ideal value of 1 LSB.
What is accuracy in ADC?
The accuracy of a converter refers to how many bits, from conversion to conversion, are repeatable. That is, accuracy reflects how true the ADC’s output reflects the actual input.
What is full-scale range in ADC?
Full Scale Range (FSR) Full Scale Range is the range defined by the reference inputs of the ADC If the ADC has only a positive reference input and the negative reference input is tied to ground FSR = VRef+, otherwise FSR = VRef+ – VRef-.
What is LSB size?
The term “LSB” is specific. It describes the last position in the digital stream. It also represents a fraction of the full-scale input range. For a 12-bit converter, the LSB value is equivalent to the analog full-scale input range, divided by 212 , or 4096.
How is ADC calculated?
ADC has a resolution of one part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC with a maximum input of 10 VDC can resolve the measurement into 10 VDC/4096 = 0.00244 VDC = 2.44 mV. Similarly, for the same 0 to 10 VDC range, a 16-bit ADC resolution is 10/216 = 10/65,536 = 0.153 mV.
How do you convert ADC to weight?
To measure weight, you have to connect your load cell with the ADC input. Your ADC reading in 24 bits wide. Now put 1kg on the load cell and the ADC reading maybe is 0x0ABC39. subtract the offset and get 0x0ABB16.
What is the LSB of an ADC and DAC?
One count is 1 LSB, and is defined as follows: (1) where N is the ADC’s or DAC’s number of bits. For ADCs that have a differential voltage reference, the LSB is
What kind of range does an ADC have?
Determine if your ADC is configured for a bipolar, or unipolar range; we’ll call this B. Your data logger has a bipolar range if it can measure signals both above and below zero. It has a unipolar range if can only measure signals that are either above or below zero, but not both at the same time.
How to calculate the least significant bit ( LSB )?
Articles on Internet and books show how to calculate the Least Significant Bit (LSB), but they take into consideration either the voltage reference (Vref) or the full scale (FS) of the ADC or DAC. Many times this leads to confusion, as a few messages I received from my readers show.
Which is the least significant bit in a DAC?
Usually, the full scale is not 5V. The voltage reference, Vref, is. Manufacturers make the voltage reference a round number like 5V or 2.5V. So, if your 10-bit DAC has a voltage reference Vref = 5V, then the least significant bit is given by equation 1 in this article: LSB = Vref / 2^N = 5V / 2^10 = 4.883 mV.