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ADC081S101 数据表(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 ADC081S101
功能描述  1MSPS, 12-/10-/8-Bit A/D Converters in SOT-23
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

ADC081S101 数据表(HTML) 10 Page - National Semiconductor (TI)

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Specification Definitions
APERTURE DELAY is the time after the falling edge of CS
to when the input signal is acquired or held for conversion.
APERTURE JITTER (APERTURE UNCERTAINTY) is the
variation in aperture delay from sample to sample. Aperture
jitter manifests itself as noise in the output.
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of
the maximum deviation from the ideal step size of 1 LSB.
DUTY CYCLE is the ratio of the time that a repetitive digital
waveform is high to the total time of one period. The speci-
fication here refers to the SCLK.
EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE
BITS) is another method of specifying Signal-to-Noise and
Distortion or SINAD. ENOB is defined as (SINAD - 1.76) /
6.02 and says that the converter is equivalent to a perfect
ADC of this (ENOB) number of bits.
FULL POWER BANDWIDTH is a measure of the frequency
at which the reconstructed output fundamental drops 3 dB
below its low frequency value for a full scale input.
GAIN ERROR is the deviation of the last code transition
(111...110) to (111...111) from the ideal (V
REF - 1.5 LSB for
ADC121S101 and ADC101S101, V
REF
- 1 LSB for
ADC081S101), after adjusting for offset error.
INTEGRAL NON-LINEARITY (INL) is a measure of the
deviation of each individual code from a line drawn from
negative full scale (12 LSB below the first code transition)
through positive full scale (12 LSB above the last code
transition). The deviation of any given code from this straight
line is measured from the center of that code value.
INTERMODULATION DISTORTION (IMD) is the creation of
additional spectral components as a result of two sinusoidal
frequencies being applied to the ADC input at the same time.
It is defined as the ratio of the power in the either the two
second order or all four third order intermodulation products
to the sum of the power in both of the original frequencies.
IMD is usually expressed in dBFS.
MISSING CODES are those output codes that will never
appear at the ADC outputs. The ADC121S101/101S101/
081S101 is guaranteed not to have any missing codes.
OFFSET ERROR is the deviation of the first code transition
(000...000) to (000...001) from the ideal (i.e. GND + 0.5 LSB
for the ADC121S101 and ADC101S101, and GND+1LSB
for the ADC081S101).
SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in
dB, of the rms value of the input signal to the rms value of the
sum of all other spectral components below one-half the
sampling frequency, not including harmonics or dc.
SIGNAL TO NOISE PLUS DISTORTION (S/N+D or SINAD)
Is the ratio, expressed in dB, of the rms value of the input
signal to the rms value of all of the other spectral compo-
nents below half the clock frequency, including harmonics
but excluding dc.
SPURIOUS FREE DYNAMIC RANGE (SFDR) is the differ-
ence, expressed in dB, between the rms values of the input
signal and the peak spurious signal, where a spurious signal
is any signal present in the output spectrum that is not
present at the input.
TOTAL HARMONIC DISTORTION (THD) is the ratio, ex-
pressed in dBc, of the rms total of the first five harmonic
levels at the output to the level of the fundamental at the
output. THD is calculated as
where Af
1 is the RMS power of the fundamental (output)
frequency and Af
2 through Af6 are the RMS power in the first
5 harmonic frequencies.
TOTAL UNADJUSTED ERROR is the worst deviation found
from the ideal transfer function. As such, it is a comprehen-
sive specification which includes full scale error, linearity
error, and offset error.
www.national.com
10


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