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模数转换器ADS1284数据手册

更新时间：2019-12-26 15:31:41 大小：2M 上传用户：sanghk查看TA发布的资源 标签：ads1284模数转换器 下载积分：1分 评价赚积分 （如何评价?） 打赏 收藏 评论(0) 举报

资料介绍

ADS1284的数据手册，ADS1284是目前最先进的高精度AD之一。

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ads1284.pdf 2M

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SBAS943A –SEPTEMBER 2018–REVISED AUGUST 2019  
ADS1284 High-Resolution, Analog-to-Digital Converter  
1 Features  
3 Description  
The ADS1284 is a high-performance, single-chip,  
analog-to-digital converter (ADC). This device  
includes a low-noise programmable gain amplifier  
(PGA), delta-sigma (ΔΣ) modulator, and digital filter.  
The ADC supports two modes of operation with  
trade-offs between power and resolution.  
1
•
•
Selectable Operating Modes  
Low-Power Mode:  
–
–
12 mW (PGA = 1, 2, 4 and 8)  
127 dB SNR (250 SPS, PGA = 1)  
•
High-Resolution Mode:  
The two-channel multiplexer has the inputs for signal  
measurement and an ADC signal test. A mode is  
available to short circuit the inputs and test for  
internal noise. The PGA has the high input  
impedance and low noise, which provides for the  
direct connection of geophone and hydrophone  
sensors.  
–
–
18 mW (PGA = 1, 2, 4 and 8)  
130 dB SNR (250 SPS, PGA = 1)  
•
•
•
•
•
•
THD: –122 dB  
CMRR: 110 dB  
Two-Channel Multiplexer  
Inherently-Stable Modulator  
Fast Responding Overrange Detector  
Flexible Digital Filter:  
The fourth-order, inherently stable modulator provides  
outstanding noise and linearity performance. The  
modulator output is filtered and decimated by the on-  
chip digital filter to yield the ADC conversion result.  
–
–
–
Sinc + FIR + IIR (Selectable)  
Linear or Minimum Phase Option  
Programmable High-Pass Filter  
The digital filter provides data rates from 250 to 4000  
SPS. The high-pass filter (HPF) has a programmable  
corner frequency. On-chip gain and offset scale  
registers support system calibration.  
•
•
•
•
Offset and Gain Calibration  
SYNC Input  
The synchronization input controls the timing of the  
ADC conversion. The power-down input puts the  
ADC into power-down mode.  
Analog Supply: 5 V or ±2.5 V  
Digital Supply: 1.8 V to 3.3 V  
The ADS1284 is available in a compact 24-lead, 5-  
mm × 4-mm VQFN package, and is fully specified  
from –40°C to +85°C, with a maximum operating  
temperature range of –50°C to +125°C.  
2 Applications  
•
•
•
Energy Exploration  
Seismic Monitoring  
High-Accuracy Instrumentation  
Device Information  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
ADS1284  
VQFN (24)  
5.00 mm × 4.00 mm  
(1) For all available packages, see the package option addendum  
at the end of the data sheet.  
Simplified Schematic  
AVDD  
PGA  
VREFN  
DVDD  
VREFP  
ADS1284  
CLK  
CS  
Input 1  
SCLK  
DOUT  
Serial  
Interface  
4th-Order  
ûꢀ Modulator  
Programmable  
Digital Filter  
Calibration  
Input 2  
DIN  
VCOM  
DRDY  
SYNC  
RESET  
PWDN  
Over-Range  
Control  
AVSS  
DGND  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
SBAS943A –SEPTEMBER 2018–REVISED AUGUST 2019  
Table of Contents  
8.1 Overview .................................................................
8.2 Functional Block Diagram .......................................
8.3 Feature Description.................................................
8.4 Device Functional Modes........................................
8.5 Programming........................................................... 
8.6 Register Maps.........................................................
Application and Implementation ........................
9.1 Application Information............................................
9.2 Typical Applications ................................................
9.3 Initialization Set Up .................................................
1
2
3
4
5
6
Features..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions.........................
Specifications.........................................................
6.1 Absolute Maximum Ratings ....................................
6.2 ESD Ratings..............................................................
6.3 Recommended Operating Conditions.......................
6.4 Thermal Information..................................................
6.5 Electrical Characteristics...........................................
6.6 Timing Requirements...............................................
6.7 Switching Characteristics..........................................
6.8 Typical Characteristics..............................................
Parameter Measurement Information ................
7.1 Noise Performance .................................................
Detailed Description ............................................
9
10 Device and Documentation Support .................
10.1 Receiving Notification of Documentation Updates
10.2 Community Resources..........................................
10.3 Trademarks........................................................... 
10.4 Electrostatic Discharge Caution............................
10.5 Glossary................................................................ 
7
8
11 Mechanical, Packaging, and Orderable  
Information ...........................................................
4 Revision History  
Changes from Original (September 2018) to Revision A  
Page  
•
Changed document to release full version to web ................................................................................................................
2
Copyright © 2018–2019, Texas Instruments Incorporated  
Product Folder Links:
 

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