参数资料
型号: EVAL-ADUC7121QSPZ
厂商: Analog Devices Inc
文件页数: 13/96页
文件大小: 0K
描述: BOARD EVALUATION FOR ADUC7121
设计资源: ADUC7121 Gerber Files
ADUC7121 Schematic
标准包装: 1
系列: MicroConverter® ADuC7xxx
类型: MCU
适用于相关产品: ADUC7121
所含物品: 板,CD
ADuC7121
Data Sheet
Rev. B | Page 20 of 96
TERMINOLOGY
ADC SPECIFICATIONS
Integral Nonlinearity
Integral nonlinearity (INL) is the maximum deviation of any
code from a straight line passing through the endpoints of the
ADC transfer function. The endpoints of the transfer function
are zero scale, a point LSB below the first code transition, and
full scale, a point LSB above the last code transition.
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between the
measured and the ideal 1 LSB change between any two adjacent
codes in the ADC.
Offset Error
Offset error is the deviation of the first code transition (0000 . . .
000) to (0000 . . . 001) from the ideal, that is, + LSB.
Gain Error
Gain error is the deviation of the last code transition from the
ideal AIN voltage (full scale 1.5 LSB) after the offset error has
been adjusted out.
Signal to (Noise + Distortion) Ratio
Signal to (noise + distortion) ratio, or SINAD, is the measured
ratio of signal to (noise + distortion) at the output of the ADC.
The signal is the rms amplitude of the fundamental. Noise is the
rms sum of all nonfundamental signals up to half the sampling
frequency (fS/2), excluding dc.
The ratio is dependent on the number of quantization levels in
the digitization process: the more levels there are, the smaller
the quantization noise becomes.
The theoretical SINAD ratio for an ideal N-bit converter with a
sine wave input is given by
Signal to (Noise + Distortion) = (6.02 N + 1.76) dB
Thus, for a 12-bit converter, this is 74 dB.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the rms sum of
the harmonics to the fundamental.
DAC SPECIFICATIONS
Relative Accuracy
Otherwise known as endpoint linearity, relative accuracy is a
measure of the maximum deviation from a straight line passing
through the endpoints of the DAC transfer function. It is
measured after adjusting for zero error and full-scale error.
Voltage Output Settling Time
This is the amount of time it takes the output to settle to within
a one LSB level for a full-scale input change.
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