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ADS1278-SP Scheda tecnica(PDF) 28 Page - Texas Instruments

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Il numero della parte ADS1278-SP
Spiegazioni elettronici  Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter
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Produttore elettronici  TI1 [Texas Instruments]
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ADS1278-SP Scheda tecnica(HTML) 28 Page - Texas Instruments

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v −VREF
223
223 * 1
* VREF
223 * 1
) VREF
223 * 1
100
0
Conversions(1/f
DATA)
0
20
10
40
30
60
50
80
70
FullySettledData
at76Conversions
(78Conversionsfor
High-Resolutionmode)
InitialValue
FinalValue
28
ADS1278-SP
SBAS937 – SEPTEMBER 2018
www.ti.com
Product Folder Links: ADS1278-SP
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
8.3.3 Phase Response
The ADS1278-SP incorporates a multiple stage, linear phase digital filter. Linear phase filters exhibit constant
delay time versus input frequency (constant group delay). This characteristic means the time delay from any
instant of the input signal to the same instant of the output data is constant and is independent of input signal
frequency. This behavior results in essentially zero phase errors when analyzing multi-tone signals.
8.3.4 Settling Time
As with frequency and phase response, the digital filter also determines settling time. Figure 62 shows the output
settling behavior after a step change on the analog inputs normalized to conversion periods. The X-axis is given
in units of conversion. Note that after the step change on the input occurs, the output data change very little prior
to 30 conversion periods. The output data are fully settled after 76 conversion periods for High-Speed and Low-
Power modes, and 78 conversion periods for High-Resolution mode.
Figure 62. Step Response
8.3.5 Data Format
The ADS1278-SP outputs 24 bits of data in twos complement format.
A positive full-scale input produces an ideal output code of 7FFFFFh, and the negative full-scale input produces
an ideal output code of 800000h. The output clips at these codes for signals exceeding full-scale. Table 3
summarizes the ideal output codes for different input signals.
Table 3. Ideal Output Code Versus Input Signal
INPUT SIGNAL VIN
(AINP – AINN)
IDEAL OUTPUT CODE(1)
≥ +VREF
7FFFFFh
000001h
0
000000h
FFFFFFh
800000h
(1) Excludes effects of noise, INL, offset, and gain errors.


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