參數資料
型號： TMP20F2810PBKAEP
廠商： Texas Instruments, Inc.
元件分類： 數字信號處理
英文描述： Digital Signal Processors
中文描述： 數字信號處理器
文件頁數： 144/159頁
文件大?。?/td> 2084K
代理商： TMP20F2810PBKAEP
Electrical Specifications
142
March 2004 Revised October 2004
SGUS051A
6.30.8
Definitions of Specifications and Terminology
Integral Nonlinearity
Integral nonlinearity refers to the deviation of each individual code from a line drawn from zero through full
scale. The point used as zero occurs 1/2 LSB before the first code transition. The full-scale point is defined
as level 1/2 LSB beyond the last code transition. The deviation is measured from the center of each particular
code to the true straight line between these two points.
Differential Nonlinearity
An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value.
A differential nonlinearity error of less than
±
1 LSB ensures no missing codes.
Zero Offset
The major carry transition should occur when the analog input is at zero volts. Zero error is defined as the
deviation of the actual transition from that point.
Gain Error
The first code transition should occur at an analog value 1/2 LSB above negative full scale. The last transition
should occur at an analog value 1 1/2 LSB below the nominal full scale. Gain error is the deviation of the actual
difference between first and last code transitions and the ideal difference between first and last code
transitions.
Signal-to-Noise Ratio + Distortion (SINAD)
SINAD is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components
below the Nyquist frequency, including harmonics but excluding dc. The value for SINAD is expressed in
decibels.
Effective Number of Bits (ENOB)
For a sine wave, SINAD can be expressed in terms of the number of bits. Using the following formula,
N
(SINAD
1.76)
6.02
it is possible to get a measure of performance expressed as N, the effective number of bits. Thus, effective
number of bits for a device for sine wave inputs at a given input frequency can be calculated directly from its
measured SINAD.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured input
signal and is expressed as a percentage or in decibels.
Spurious Free Dynamic Range (SFDR)
SFDR is the difference in dB between the rms amplitude of the input signal and the peak spurious signal.
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