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ADS1258

更新时间： 2024-02-02 21:32:01
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德州仪器 - TI 转换器
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47页 766K
描述
16-Channel, 24-Bit Analog-to-Digital Converter

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ADS1258 数据手册

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ADS1258  
www.ti.com  
SBAS297A–JUNE 2005–REVISED SEPTEMBER 2005  
16-Channel, 24-Bit Analog-to-Digital Converter  
FEATURES  
DESCRIPTION  
•
•
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•
•
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24 Bits, No Missing Codes  
The ADS1258 is  
a
16-channel (multiplexed),  
low-noise, 24-bit, delta-sigma (∆Σ) analog-to-digital  
converter (ADC) that provides single-cycle settled  
data at channel scan rates from 1.8k to 23.7k  
Fixed-Channel or Automatic Channel Scan  
Fixed-Channel Data Rate: 125kSPS  
Auto-Scan Data Rate: 23.7kSPS  
Single-Conversion Settled Data  
samples per second (SPS).  
A
flexible input  
multiplexer accepts combinations of eight differential  
or 16 single-ended inputs with a full-scale differential  
range of 5V or true bipolar range of ±2.5V when  
operating with a 5V reference. The fourth-order  
delta-sigma modulator is followed by a fifth-order sinc  
digital filter optimized for low-noise performance.  
16 Single-Ended or 8 Differential Inputs  
Unipolar (+5V) or Bipolar (±2.5V) Operation  
Low Noise: 2.8µVRMS at 1.8kSPS  
0.0003% Integral Nonlinearity  
DC Stability (typical):  
0.02µV/°C Offset Drift, 0.4ppm/°C Gain Drift  
The differential output of the multiplexer is accessible  
to allow signal conditioning prior to the input of the  
ADC. Internal system monitor registers provide  
supply voltage, temperature, reference voltage, gain,  
and offset data.  
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Open-Sensor Detection  
Conversion Control (Pin and Commands)  
Multiplexer Output for External Signal  
Conditioning  
An onboard PLL generates the system clock from a  
32.768kHz crystal, or can be overridden by an  
external clock source. A buffered system clock output  
(15.7MHz) is provided to drive a microcontroller or  
additional converters.  
•
On-Chip Temperature, Reference, Offset,  
Gain, and Supply Voltage Readback  
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42mW Power Dissipation  
Serial digital communication is handled via an  
SPI™-compatible interface. A simple command word  
structure controls channel configuration, data rates,  
digital I/O, monitor functions, etc.  
Standby, Sleep, and Power-Down Modes  
8 General-Purpose Inputs/Outputs (GPIO)  
32.768kHz Crystal Oscillator or External Clock  
Programmable sensor bias current sources can be  
used to bias sensors or verify sensor integrity.  
APPLICATIONS  
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Medical, Avionics, and Process Control  
Machine and System Monitoring  
Fast Scan Multi-Channel Instrumentation  
Industrial Process Controls  
The ADS1258 operates from a unipolar +5V or  
bipolar ±2.5V analog supply and a digital supply  
compatible with interfaces ranging from 2.7V to  
5.25V. The ADS1258 is available in a QFN-48  
package.  
Test and Measurement Systems  
AVDD  
DVDD  
V
GPIO[7:0]  
REF  
Internal  
Monitoring  
ADS1258  
GPIO  
CS  
1
DRDY  
SCLK  
DIN  
Digital  
Filter  
SPI  
24−Bit  
ADC  
16:1  
Analog  
Interface  
Analog Inputs  
Input  
DOUT  
MUX  
START  
RESET  
PWDN  
16  
Oscillator  
Control  
AINCOM  
AVSS  
MUX  
Out  
ADC  
In  
Extclk  
In/Out  
DGND  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
SPI is a trademark of Motorola, Inc.  
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005, Texas Instruments Incorporated  
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ADS1258 替代型号

型号 品牌 替代类型 描述 数据表
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