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CSD-1401MC Datasheet(PDF) 6 Page - Murata Power Solutions Inc.

No. de pieza CSD-1401MC
Descripción Electrónicos  14-Bit, Fast-Settling Correlated Double Sampling Circuit
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Fabricante Electrónico  MURATA-PS [Murata Power Solutions Inc.]
Página de inicio  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

CSD-1401MC Datasheet(HTML) 6 Page - Murata Power Solutions Inc.

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CDS-1401
®
®
For most sampling A/D's, the rising edge of the start-convert
pulse drives the internal S/H into the hold mode under the
assumption the S/H has already fully acquired and is tracking
the input signal. In this case, the same edge can not be used
to drive S/H2 into the hold mode and simultaneously initiate the
A/D conversion. The output of S/H2 needs time to settle its
sample-to-hold switching transient, and the input S/H of the
A/D needs time to fully acquire its new input signal.
As shown in Figure 1, output line A/D CLOCK1 (pin 18) is a
slightly delayed version of the signal applied to pin 11 (S/H1
COMMAND), and A/D CLOCK1 (pin 17) is its complement.
A/D CLOCK2 (pin 19) is a delayed version of the signal applied
to pin 12 (S/H2 COMMAND), and A/D CLOCK2 (pin 20) is its
complement. Any one of these signals, as appropriate, may be
used to trigger the A/D conversion.
Figure 3 is a typical timing diagram for a CDS-1401 in front of
DATEL's 12-bit, 1.2MHz sampling A/D, the ADS-CCD1201.
less than that of video signals, it may not be necessary for the
allocated acquisition time of S/H1 to be as long as that of S/H2.
As shown in the plot (Figure 4) of acquisition times vs. input
signal step size, the S/H's internal to the CDS-1401 acquire
smaller-amplitude signals quicker than they acquire larger-
amplitude signals. In "maximum-throughput" applications,
assuming "asymmetric" timing can be accommodated, each
S/H should only be given the time it requires, and no more, to
acquire its input signal. Leaving a S/H amp in the sample
mode for a longer period of time has little added benefit.
As an example, the graph shows that it takes 160ns to acquire
a 500mV step to within 10mV of accuracy and 260ns to
acquire a 500mV step to within 0.5mV of accuracy. The figures
in this graph are typical values at room temperature.
The CDS-1401 brings out 4 control lines that can be used to
trigger an A/D converter connected to its output. If the A/D is
a sampling type, system timing should be such that the A/D's
input S/H amplifier is acquiring the output of the CDS-1401 at
the same time the output is settling to its final value.
Figure 4. Acquisition Time versus Accuracy and Step Size
160
180
200
220
240
260
280
300
320
340
012
34567
89
10
Input Step Size (Volts)
±0.5mV accuracy
±1mV accuracy
±2mV accuracy
±5mV accuracy
±10mV accuracy


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