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ADS1158_14

更新时间： 2024-02-11 18:18:40
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德州仪器 - TI /
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50页 967K
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16-Channel, 16-Bit Analog-to-Digital Converter

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ADS1158  
www.ti.com ............................................................................................................................................................. SBAS429A–JUNE 2008–REVISED JUNE 2008  
16-Channel, 16-Bit Analog-to-Digital Converter  
1
FEATURES  
DESCRIPTION  
23  
•
16 Bits, No Missing Codes  
The ADS1158 is  
a
16-channel (multiplexed),  
low-noise, 16-bit, delta-sigma (ΔΣ) analog-to-digital  
converter (ADC) that provides single-cycle settled  
data at channel scan rates from 1.8k to 23.7k  
samples per second (SPS) per channel. 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.  
•
•
•
•
•
•
•
•
Fixed-Channel or Automatic Channel Scan  
Fixed-Channel Data Rate: 125kSPS  
Auto-Scan Data Rate: 23.7kSPS/Channel  
Single-Conversion Settled Data  
16 Single-Ended or 8 Differential Inputs  
Unipolar (+5V) or Bipolar (±2.5V) Operation  
0.3LSB (INL)  
DC Stability:  
0.02µV/°C Offset Drift, 0.4ppm/°C Gain Drift  
The differential output of the multiplexer is accessible  
to allow signal conditioning before the input of the  
ADC. Internal system monitor registers provide  
supply voltage, temperature, reference voltage, gain,  
and offset data.  
•
•
•
Open-Sensor Detection  
Conversion Control Pin  
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  
•
•
•
•
42mW Power Dissipation  
Standby, Sleep, and Power-Down Modes  
Eight General-Purpose Inputs/Outputs (GPIO)  
32.768kHz Crystal Oscillator or External Clock  
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.  
APPLICATIONS  
Programmable sensor bias current sources can be  
used to bias sensors or verify sensor integrity.  
•
•
•
•
•
Medical, Avionics, and Process Control  
Machine and System Monitoring  
Fast Scan Multi-Channel Instrumentation  
Industrial Systems  
The ADS1158 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 ADS1158 is available in a QFN-48  
package.  
Test and Measurement Systems  
AVDD  
VREF  
DVDD  
GPIO[7:0]  
Internal  
Monitoring  
ADS1158  
GPIO  
CS  
1
DRDY  
SCLK  
DIN  
16-Bit  
ADC  
Digital  
Filter  
SPI  
Interface  
16:1  
Analog Inputs  
Analog  
Input  
MUX  
DOUT  
START  
RESET  
PWDN  
16  
AINCOM  
Oscillator  
Control  
AVSS  
MUX  
OUT  
ADC  
IN  
Ext CLK  
In/Out  
DGND  
32.768kHz  
1
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.  
2
3
SPI is a trademark of Motorola, Inc.  
All other 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 © 2008, Texas Instruments Incorporated  
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