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ADS1178 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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tên linh kiện ADS1178
Giải thích chi tiết về linh kiện  Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters
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ADS1178 bảng dữ liệu(HTML) 10 Page - Texas Instruments

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FUNCTIONAL DESCRIPTION
SAMPLING APERTURE MATCHING
ADS1174
ADS1178
SBAS373 – OCTOBER 2007
Because the input signal is sampled at a very high
rate, input signal aliasing does not occur until the
The ADS1174 and ADS1178 are delta/sigma ADCs
input signal frequency is at the modulator sampling
consisting of independent converters that digitize
rate. This high sampling rate greatly relaxes the
input signals in parallel. The ADS1174 consists of
requirement of external antialiasing filters allowing
four independent converters, while the ADS1178 has
very low passband phase errors.
eight independent converters.
The converter is composed of two main functional
blocks
to
perform
the
ADC
conversions:
the
The converters of the ADS1174/78 operate from the
modulator and the digital filter.
The
modulator
same CLK input. The CLK input controls the timing of
samples the input signal together with sampling the
the modulator sampling instant. The converter is
reference voltage to produce a 1's density output
designed such that the sampling skew, or modulator
stream.
The
density
of
the
output
stream
is
sampling
aperture
match,
between
channels
is
proportional to the analog input level relative to the
controlled to within 200ps. Furthermore, the digital
reference voltage. The pulse stream is filtered by the
filters are synchronized to start the convolution phase
internal digital filter where the output conversion
at the same modulator clock cycle. This design
result is produced.
results
in
excellent
phase
match
among
the
In operation, the signal inputs and reference inputs
ADS1174/78 channels.
are sampled by the modulator at a high rate (typically
The phase match of one four-channel ADS1174 to
64x higher than the final output data rate). The
that of another ADS1174 may not have the same
quantization noise of the modulator is moved to a
degree of sampling match (the same is true for the
higher frequency range where the internal digital filter
8-channel ADS1178). As a result of manufacturing
removes it. This process results in very low levels of
variations, differences in internal propagation delay of
noise within the signal passband.
the internal CLK signal coupled with differences of
the arrival of the external CLK signal to each device
may cause larger sampling match errors. Equal
length CLK traces or external clock distribution
devices can be used to control the arrival of the CLK
signals to help reduce the sampling match error.
10
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS1174 ADS1178


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