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Analog-to-digital converter - Resolution | | Analog-to-digital converter - Resolution: Encyclopedia II - Analog-to-digital converter - Resolution | | The resolution of the converter indicates the number of discrete values it can produce. It is usually expressed in bits. For example, an ADC that encodes an analog input to one of 256 discrete values has a resolution of eight bits, since
28 = 256.
Resolution can also be defined electrically, and expressed in volts. The voltage resolution of an ADC is equal to its overall voltage measurement range divided by the number of discrete values. Some examples may help:
Example 1
Full scale ...
See also:Analog-to-digital converter, Analog-to-digital converter - Resolution, Analog-to-digital converter - Response type, Analog-to-digital converter - Linear ADCs, Analog-to-digital converter - Non-linear ADCs, Analog-to-digital converter - Accuracy, Analog-to-digital converter - Sampling rate, Analog-to-digital converter - Aliasing, Analog-to-digital converter - Dither, Analog-to-digital converter - Oversampling, Analog-to-digital converter - ADC structures, Analog-to-digital converter - Application to music recording, Analog-to-digital converter - Other applications | | | Analog-to-digital converter, Analog-to-digital converter - ADC structures, Analog-to-digital converter - Accuracy, Analog-to-digital converter - Aliasing, Analog-to-digital converter - Application to music recording, Analog-to-digital converter - Dither, Analog-to-digital converter - Linear ADCs, Analog-to-digital converter - Non-linear ADCs, Analog-to-digital converter - Other applications, Analog-to-digital converter - Oversampling, Analog-to-digital converter - Resolution, Analog-to-digital converter - Response type, Analog-to-digital converter - Sampling rate, Digital signal processing, Modem, quantization noise | | |
| | | Analog-to-digital converter: Encyclopedia II - Analog-to-digital converter - Resolution
Analog-to-digital converter - Resolution
The resolution of the converter indicates the number of discrete values it can produce. It is usually expressed in bits. For example, an ADC that encodes an analog input to one of 256 discrete values has a resolution of eight bits, since
28 = 256.
Resolution can also be defined electrically, and expressed in volts. The voltage resolution of an ADC is equal to its overall voltage measurement range divided by the number of discrete values. Some examples may help:
- Example 1
- Full scale measurement range = 0 to 10 volts
- ADC resolution is 12 bits: 212 = 4096 quantization levels
- ADC voltage resolution is: (10-0)/4096 = 0.00244 volts = 2.44 mV
- Example 2
- Full scale measurement range = -10 to +10 volts
- ADC resolution is 14 bits: 214 = 16384 quantization levels
- ADC voltage resolution is: (10-(-10))/16384 = 20/16384 = 0.00122 volts = 1.22 mV
In practice, the resolution of the converter is limited by the signal-to-noise ratio of the signal in question. If there is too much noise present in the analog input, it will be impossible to accurately resolve beyond a certain number of bits of resolution, the "effective number of bits" (ENOB). While the ADC will produce a result, the result is not accurate, since its lower bits are simply measuring noise. The S/N ratio should be around 6 dB per bit of resolution required.
Other related archivesCDF, DAC, Digital signal processing, Full scale, LSB, MPEG, Modem, Nyquist frequency, Nyquist-Shannon sampling theorem, PCM, RMS, Shannon-Nyquist sampling theorem, TV tuner cards, a-law, aliasing, amplifiers, anti-aliasing, binary search, bits, calibration, capacitance, capacitor, compact disc, companders, comparator, compressors, continuous, counter, delta-sigma modulation, die, differential, digital, digital oscilloscopes, digital to analog converter, digital-to-analog converter, dither, dithering, dynamic range, electricity meters, electronic, entropy, feedback, filtered, glitches, integrated circuits, interpolation, kilohertz, laplacian distribution, least significant bit, linear, linearity, logic circuit, magnitude, memory-mapped IO, microcontrollers, microprocessors, multiplexer, noise shaping, oscillator, probability density function, quantization, quantization error, quantization noise, resolution, sample and hold, sampling frequency, saw-tooth signal, serial, serial bus, shaft encoders, sigma-delta modulation, signal-to-noise ratio, signals, software defined radio, standard deviation, time, transistors, uniform, uniform distribution, video, video cameras, video capture cards, voltage, volts, white noise, μ-law
 Adapted from the Wikipedia article "Resolution", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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