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ADS1278-SP Arkusz danych(PDF) 46 Page - Texas Instruments

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Numer części ADS1278-SP
Szczegółowy opis  Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter
Download  57 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1278-SP Arkusz danych(HTML) 46 Page - Texas Instruments

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IN1(+)
AINP1
AINN1
IN4/8(+)
+3.3 V
+1.8 V
(6)
AINP4/8
AINN4/8
AVDD
DVDD
VREFP
VREFN
VCOM
TEST0
TEST1
DIN
AGND
DGND
IOVDD
CLK
DRDY/FSYNC
DVDD (I/O)
DR
FSR
DOUT1
SCLK
CVDD
(CORE)
DOUT2
DOUT3
DOUT4
SYNC
PWDN1
I/O
PWDN2
PWDN3
PWDN4
CLKDIV
FORMAT2
MODE1
FORMAT1
FORMAT0
10 µF
(2)
+
10 µF
(2)
10 µF
+
0.1 µF
(2)
0.1 µF
(2)
LM4050QML-SP
+5 V
10 µF
(2)
50 Ω
+3.3 V
(High-Speed, Frame-Sync, TDM,
and Fixed-Position data selected.)
ADS1278-SP
Microcontroller /
DSP
200 MHz
+1.6 V
THS4521
(1)
2.2 nF
(3)
2.2 nF
(3)
(4)
Buffered
VCOM
Output
100 Ω
See
Note (5)
50 Ω
U1
U2
CLKR
Q
Q
0
>
+3.3 V
MODE0
IN1(-)
IN4/8(-)
1 µF
+5 V
See
Note (6)
LM124AQML-SP
46
ADS1278-SP
SBAS937 – SEPTEMBER 2018
www.ti.com
Product Folder Links: ADS1278-SP
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The ADS1278-SP is a radiation-hardened high resolution delta-sigma ADC that is ideal for precision sensing and
high accuracy instrumentation applications. With eight simultaneous sampling 24-bit ADCs integrated, the device
reduces the board area needed to digitize eight analog signals.
9.2 Typical Application
Figure 83. Typical Application Schematic
9.2.1 Design Requirements
Depending on the accuracy and speed requirements of the sensing application to be digitized by the ADC1278-
SP, users must first determine the optimal device configuration. Table 16 shows the possible configurations for
device for the maximum fCLKIN for each configuration. The yellow highlighted columns indicate user defined
inputs (through I/O pins) to the device, while the italic row indicates the default configuration of the
ADS1278EVM-CVAL EVM that is available as a reference design. As shown, a maximum data rate of 52734
SPS is possible while using the High Resolution mode, which yields a typical SNR of 111 dB or an ENOB of 18
bits.


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