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AD7357 датащи(PDF) 10 Page - Analog Devices

номер детали AD7357
подробное описание детали  Differential Input,Dual,Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7357 датащи(HTML) 10 Page - Analog Devices

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AD7357
Preliminary Technical Data
Rev. PrD | Page 10 of 17
Peak Harmonic or Spurious Noise
Peak harmonic or spurious noise is defined as the ratio of the
rms value of the next largest component in the ADC output
spectrum (up to fS/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is
determined by the largest harmonic in the spectrum, but for
ADCs where the harmonics are buried in the noise floor, it is a
noise peak
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa ± nfb where
m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms
are those for which neither m nor n are equal to zero. For
example, the second-order terms include (fa + fb) and (fa − fb),
while the third-order terms include (2fa + fb), (2fa − fb), (fa +
2fb), and (fa − 2fb).
The AD7356 is tested using the CCIF standard where two input
frequencies near the top end of the input bandwidth are used.
In this case, the second-order terms are usually distanced in
frequency from the original sine waves, while the third-order
terms are usually at a frequency close to the input frequencies.
As a result, the second- and third-order terms are specified
separately. The calculation of the intermodulation distortion is
as per the THD specification, where it is the ratio of the rms
sum of the individual distortion products to the rms amplitude
of the sum of the fundamentals expressed in dBs.
Thermal Hysteresis
Thermal Hysteresis is defined as the absolute maximum change
of reference output voltage after the device is cycled through
temperature from either
T_HYS+ = +25°C to TMAX to +25°C
T_HYS– = +25°C to TMIN to +25°C
It is expressed in ppm using the following equation:
6
10
)
25
(
)
_
(
)
25
(
)
(
×
°
°
=
C
V
HYS
T
V
C
V
ppm
V
REF
REF
REF
HYS
where:
VREF(25°C) = VREF at 25°C
VREF(T_HYS) = Maximum change of VREF at T_HYS+ or
T_HYS–.


Аналогичный номер детали - AD7357

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Аналогичное описание - AD7357

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