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ADS1259_12

更新时间： 2024-11-18 12:34:51
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德州仪器 - TI 转换器
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48页 1033K
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Industrial, 14kSPS, 24-Bit Analog-to-Digital Converter with Low-Drift Reference

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ADS1259  
www.ti.com  
SBAS424D –JUNE 2009–REVISED AUGUST 2011  
Industrial, 14kSPS, 24-Bit Analog-to-Digital Converter  
with Low-Drift Reference  
Check for Samples: ADS1259  
1
FEATURES  
DESCRIPTION  
The ADS1259 is a high-linearity, low-drift, 24-bit,  
analog-to-digital converter (ADC) designed for the  
needs of industrial process control, precision  
instrumentation, and other exacting applications.  
Combined with a signal amplifier (such as the  
23  
•
24 Bits, No Missing Codes  
Output Data Rates From 10 To 14kSPS  
High Performance:  
•
•
–
–
–
–
–
INL: 0.4ppm  
PGA280),  
a
high-resolution,  
high-accuracy  
Reference Drift: 2ppm/°C  
Gain Drift: 0.5ppm/°C  
Offset Drift: 0.05μV/°C  
Noise: 0.7μVRMS at 60SPS  
measurement system is formed that is capable of  
digitizing a wide range of signals.  
The converter uses a fourth-order, inherently stable,  
delta-sigma (ΔΣ) modulator that provides outstanding  
noise and linearity performance. The data rates are  
programmable up to 14kSPS including 10SPS,  
50SPS, and 60SPS that provide excellent normal  
mode line-cycle rejection. The digital filter can be  
programmed for a fast settling mode where the  
conversions settle in a single cycle, or programmed  
for a high line-cycle rejection mode. A fast responding  
input over-range detector flags the conversion data if  
an input over-range should occur.  
•
•
•
•
•
Simultaneous 50/60Hz Rejection at 10SPS  
Single-Cycle Settling  
Internal Oscillator  
Out-of-Range Detection  
Readback Data Integrity by Checksum and  
Redundant Data Read Capability  
•
•
•
•
SPI™-Compatible Interface  
Analog Supply: +5V or ±2.5V  
Digital Supply: +2.7V to +5V  
Low Power: 13mW  
The ADS1259 also provides an integrated low-noise,  
very low drift 2.5V reference. The on-chip oscillator,  
an external crystal, or an external clock can by used  
as the ADC clock source.  
APPLICATIONS  
Data and control communication are handled over a  
4MHz, SPI-compatible interface capable of operating  
with a minimum of three wires. Data integrity is  
augmented by data bytes checksum and redundant  
data read capability. Conversions are synchronized  
either by command or by pin.  
•
•
•
Industrial Process Control  
Scientific Instrumentation  
Test and Measurement  
AVDD VREFP VREFN REFOUT  
SYNCOUT  
DVDD  
Dissipating only 13mW in operation, the ADS1259  
can be powered down, dissipating less than 25μW.  
The ADS1259 is offered in a TSSOP-20 package and  
is fully specified from –40°C to +105°C.  
XTAL1/CLKIN  
XTAL2  
Clock  
Generator  
2.5V  
Reference  
fCLK/8  
AINP  
AINN  
RESET/PWDN  
START  
DS  
Programmable  
Digital Filter  
Calibration  
Engine  
Modulator  
Control  
and  
Serial  
RELATED PRODUCTS  
DRDY  
SCLK  
DIN  
FEATURES  
24-bit ADC with integrated PGA  
Wide-range PGA  
PRODUCT  
ADS1256  
PGA280  
Out-of-Range  
Detection  
Interface  
DOUT  
CS  
ADS1259  
High-precision PGA; G = 1, 10, 100, 1000  
PGA204  
AVSS  
DGND  
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.  
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 © 2009–2011, Texas Instruments Incorporated  
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