推荐星级：
- 1
- 2
- 3
- 4
- 5
模数转换器ADS1284数据手册
资料介绍
ADS1284的数据手册，ADS1284是目前最先进的高精度AD之一。
部分文件列表
| 文件名 | 大小 |
| ads1284.pdf | 2M |
部分页面预览
（完整内容请下载后查看）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:
全部评论(0)