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模数转换器ADS1284数据手册

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ADS1284的数据手册，ADS1284是目前最先进的高精度AD之一。

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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.

•

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

Input 1

SCLK

DOUT

Serial

Interface

4th-Order

ûꢀ Modulator

Programmable

Digital Filter

Calibration

Input 2

DIN

V_COM

DRDY

SYNC

RESET

PWDN

Over-Range

Control

AVSS

DGND

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 .................................................

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 ............................................

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................................................................

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 ................................................................................................................

Product Folder Links:

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模数转换器ADS1284数据手册

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