參數(shù)資料
型號： TMDXCNCD28069ISO
廠商： Texas Instruments
文件頁數(shù)： 171/174頁
文件大?。?/td> 0K
描述： EVAL PICCOLO CONTROLCARD
標(biāo)準(zhǔn)包裝： 1
系列： TMS320F2806x, Piccolo™, C2000™
主要目的： 接口，RS232，GPIO
嵌入式： 是，MCU，32 位
已用 IC / 零件： TMS320F2806x
已供物品： 板
6.02
1.76)
(SINAD
N
-
=
SPRS698D – NOVEMBER 2010 – REVISED DECEMBER 2012
5.11 Detailed Descriptions
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 one-half LSB before the first code transition. The full-scale point is
defined as level one-half 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 one-half LSB above negative full scale. The last
transition should occur at an analog value one and one-half 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,
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 nine 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.
96
Peripheral and Electrical Specifications
Copyright 2010–2012, Texas Instruments Incorporated
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