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ADS1218Y250G4 PDF预览

ADS1218Y250G4

更新时间： 2024-10-01 12:54:03
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德州仪器 - TI 转换器存储
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44页 849K
描述
8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

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ADS1218Y250G4 数据手册

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ADS1218  
SBAS187C–SEPTEMBER 2001–REVISED SEPTEMBER 2005  
8-Channel, 24-Bit  
ANALOG-TO-DIGITAL CONVERTER with FLASH Memory  
The eight input channels are multiplexed. Internal  
FEATURES  
buffering can be selected to provide a very high input  
impedance for direct connection to transducers or  
low-level voltage signals. Burnout current sources are  
provided that allow for the detection of an open or  
shorted sensor. An 8-bit Digital-to-Analog (D/A)  
converter provides an offset correction with a range  
of 50% of the FSR (Full-Scale Range).  
•
•
•
24 BITS NO MISSING CODES  
0.0015% INL  
22 BITS EFFECTIVE RESOLUTION (PGA = 1),  
19 BITS (PGA = 128)  
•
4K BYTES OF FLASH MEMORY  
PROGRAMMABLE FROM 2.7V TO 5.25V  
The PGA (Programmable Gain Amplifier) provides  
selectable gains of 1 to 128 with an effective  
resolution of 19 bits at a gain of 128. The A/D  
conversion is accomplished with a second-order  
delta-sigma modulator and programmable sinc filter.  
The reference input is differential and can be used for  
ratiometric conversion. The on-board current DACs  
(Digital-to-Analog Converters) operate independently  
with the maximum current set by an external resistor.  
•
•
•
PGA FROM 1 TO 128  
SINGLE CYCLE SETTLING MODE  
PROGRAMMABLE DATA OUTPUT RATES UP  
TO 1kHz  
•
•
PRECISION ON-CHIP 1.25V/2.5V REFERENCE:  
ACCURACY: 0.2%  
DRIFT: 5ppm/°C  
EXTERNAL DIFFERENTIAL REFERENCE OF  
0.1V TO 2.5V  
The serial interface is SPI-compatible. Eight bits of  
digital I/O are also provided that can be used for input  
or output. The ADS1218 is designed for  
high-resolution measurement applications in smart  
transmitters, industrial process control, weight scales,  
chromatography, and portable instrumentation.  
•
•
•
•
•
ON-CHIP CALIBRATION  
PIN-COMPATIBLE WITH ADS1216  
SPI™ COMPATIBLE  
2.7V TO 5.25V  
AGND AVDD  
RDAC  
VREFOUT  
VRCAP  
VREF+  
VREF−  
XIN  
XOUT  
< 1mW POWER CONSUMPTION  
8−Bit  
IDAC  
IDAC2  
IDAC1  
Clock Generator  
1.25V or  
2.5V  
Reference  
APPLICATIONS  
8−Bit  
IDAC  
•
•
•
•
•
•
•
INDUSTRIAL PROCESS CONTROL  
LIQUID/GAS CHROMATOGRAPHY  
BLOOD ANALYSIS  
SMART TRANSMITTERS  
PORTABLE INSTRUMENTATION  
WEIGHT SCALES  
Offset  
DAC  
AIN  
AIN  
AIN  
AIN  
AIN  
AIN  
AIN  
AIN  
0
1
2
3
4
5
6
7
Registers  
RAM  
Program−  
mable  
2nd−Order  
Modulator  
MUX  
+
Controller  
BUF  
PGA  
Digital  
Filter  
4K Bytes  
FLASH  
WREN  
POL  
PRESSURE TRANSDUCERS  
AINCOM  
SCLK  
DIN  
DESCRIPTION  
Serial Interface  
RESET DRDY  
Digital I/O  
Interface  
DOUT  
CS  
The ADS1218 is a precision, wide dynamic range,  
delta-sigma, Analog-to-Digital (A/D) converter with  
24-bit resolution and Flash memory operating from  
2.7V to 5.25V supplies. The delta-sigma, A/D  
converter provides up to 24 bits of no missing code  
performance and effective resolution of 22 bits.  
DVDD  
DGND BUFEN  
D0 ... D7  
PDWN DSYNC  
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.  
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 © 2001–2005, Texas Instruments Incorporated  
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