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ADS1278-SP データシート(PDF) 23 Page - Texas Instruments

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部品番号 ADS1278-SP
部品情報  Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1278-SP データシート(HTML) 23 Page - Texas Instruments

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background image
DS
Modulator1
Digital
Filter1
VREFP
V
IN1
VREFN
V
REF
S
TEST[1:0]
FORMAT[2:0]
CLK
SYNC
PWDN [8:1]
CLKDIV
MODE[1:0]
DRDY /FSYNC
SCLK
DOUT [8:1]
DIN
SPI
and
Frame-Sync
Interface
Control
Logic
AINP1
AINN1
VCOM
S
DS
Modulator2
Digital
Filter2
V
IN2
S
AINP2
AINN2
DS
Modulator8
Digital
Filter8
V
IN4/8
S
AINP8
AINN8
DVDD
AVDD
AGND
DGND
IOVDD
R
R
Modulator
Output
Mod 1
Mod 2
Mod 8
23
ADS1278-SP
www.ti.com
SBAS937 – SEPTEMBER 2018
Product Folder Links: ADS1278-SP
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Sampling Aperture Matching
The ADS1278-SP converter operates from the same CLK input. The CLK input controls the timing of the
modulator sampling instant. The converter is designed such that the sampling skew, or modulator sampling
aperture match between channels, is controlled. Furthermore, the digital filters are synchronized to start the
convolution phase at the same modulator clock cycle. This design results in excellent phase match among the
ADS1278-SP channels.
Figure 37 shows the inter-device channel sample matching for the ADS1278-SP.
8.3.2 Frequency Response
The digital filter sets the overall frequency response. The filter uses a multi-stage FIR topology to provide linear
phase with minimal passband ripple and high stop band attenuation. The filter coefficients are identical to the
coefficients used in the ADS1271. The oversampling ratio of the digital filter (that is, the ratio of the modulator
sampling to the output data rate, or fMOD/fDATA) is a function of the selected mode, as shown in Table 1.
Table 1. Oversampling Ratio vs Mode
MODE SELECTION
OVERSAMPLING RATIO (fMOD/fDATA)
High-Speed
64
High-Resolution
128
Low-Power
64
Low-Speed
64


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