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ADS1281_14

更新时间： 2024-11-02 02:58:51
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德州仪器 - TI /
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High-Resolution Analog-to-Digital Converter

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SBAS378A–SEPTEMBER 2007–REVISED NOVEMBER 2007  
High-Resolution Analog-to-Digital Converter  
1
FEATURES  
DESCRIPTION  
2
•
High Resolution:  
The ADS1281 is an extremely high-performance,  
single-chip analog-to-digital converter (ADC)  
designed for the demanding needs of energy  
exploration and seismic monitoring environments.  
The single-chip design promotes board area savings  
for improvements in high-density applications.  
–
–
130dB SNR (250SPS)  
127dB SNR (500SPS)  
•
High Accuracy:  
–
–
THD: –122dB (typ), –115dB (max)  
INL: 0.6ppm  
The converter uses a fourth-order, inherently stable,  
delta-sigma (ΔΣ) modulator that provides outstanding  
noise and linearity performance. The modulator is  
used either in conjunction with the on-chip digital  
filter, or can be bypassed for use with  
post-processing filters.  
•
•
Inherently Stable Modulator with Fast  
Responding Over-Range Detection  
Flexible Digital Filter:  
–
–
–
–
Sinc + FIR + IIR (Selectable)  
Linear or Minimum Phase Response  
Programmable High-Pass Filter  
Selectable FIR Data Rates:  
The digital filter consists of sinc and finite impulse  
response (FIR) low-pass stages followed by an  
infinite impulse response (IIR) high-pass filter (HPF)  
stage. Selectable decimation provides data rates from  
250 to 4000 samples per second (SPS). The FIR  
low-pass stage provides both linear and minimum  
phase response. The HPF features an adjustable  
corner frequency. On-chip gain and offset scaling  
registers support system calibration.  
–
250SPS to 4kSPS  
•
•
Filter Bypass Option  
Low Power Consumption:  
–
–
Operating: 12mW  
Shutdown: 10µW  
The synchronization input (SYNC) can be used to  
synchronize the conversions of multiple ADS1281s.  
The SYNC input also accepts a clock input for  
continuous alignment of conversions from an external  
source.  
•
Calibration Engine for Offset and  
Gain Correction  
•
•
Synchronization Input  
Analog Supply:  
–
Unipolar (+5V) or Bipolar (±2.5V)  
Together, the modulator and filter dissipate only  
12mW. The ADS1281 is available in a compact  
TSSOP-24 package and is fully specified from –40°C  
to +85°C, with a maximum operating range to  
+125°C.  
•
Digital Supply: 1.8V to 3.3V  
APPLICATIONS  
•
•
•
Energy Exploration  
Seismic Monitoring  
High-Accuracy Instrumentation  
AVDD VREFN VREFP  
DVDD  
CLK  
ADS1281  
SCLK  
DOUT  
AINP  
AINN  
4th-Order  
DS  
Programmable  
Digital Filter  
Serial  
Calibration  
Interface  
DIN  
Modulator  
DRDY  
Over-Range  
SYNC  
RESET  
PWDN  
Control  
Modulator Output  
3
DGND  
AVSS  
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
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 © 2007, Texas Instruments Incorporated  
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