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ADS1282

更新时间： 2024-11-01 04:31:39
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德州仪器 - TI 转换器
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High-Resolution Analog-to-Digital Converter

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SBAS418A–SEPTEMBER 2007–REVISED DECEMBER 2007  
High-Resolution Analog-to-Digital Converter  
1
FEATURES  
DESCRIPTION  
2
•
High Resolution:  
The ADS1282 is an extremely high-performance,  
single-chip analog-to-digital converter (ADC) with an  
integrated, low-noise programmable gain amplifier  
(PGA) and two-channel input MUX. The ADS1282 is  
suitable for the demanding needs of energy  
exploration and seismic monitoring environments.  
–130dB SNR (250SPS, High-Resolution Mode)  
–127dB SNR (250SPS, Low-Power Mode)  
•
High Accuracy:  
THD: –120dB  
INL: 0.8ppm  
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.  
•
•
•
Low-Noise PGA  
Two-Channel Input MUX  
Inherently-Stable Modulator with Fast  
Responding Over-Range Detection  
•
Flexible Digital Filter:  
Sinc + FIR + IIR (Selectable)  
The flexible input MUX provides an additional  
external input for measurement, as well as internal  
self-test connections. The PGA features very low  
noise (4nV/√Hz) and high input impedance, allowing  
easy interfacing to geophones and hydrophones.  
Linear or Minimum Phase Response  
Programmable High-Pass Filter  
Selectable FIR Data Rates: 250SPS to 4kSPS  
•
•
Filter Bypass Option  
The digital filter provides selectable data rates from  
250 to 4000 samples per second (SPS). The  
high-pass filter (HPF) features an adjustable corner  
frequency. On-chip gain and offset scaling registers  
supports system calibration.  
Low Power Consumption:  
High-Resolution Mode: 27mW  
Low-Power Mode: 16mW  
Shutdown: 10µW  
•
•
•
Offset and Gain Calibration Engine  
Synchronization Input  
The synchronization input (SYNC) can be used to  
synchronize the conversions of multiple ADS1282s.  
The SYNC input also accepts a clock input for  
continuous alignment of conversions from an external  
source.  
Analog Supply:  
Unipolar (+5V) or Bipolar (±2.5V)  
•
Digital Supply: 1.8V to 3.3V  
Two operating modes allow optimization of noise and  
power. Together, the amplifier, modulator, and filter  
dissipate 27mW and only 16mW in low-power mode.  
The ADS1282 is available in a compact TSSOP-28  
package and is fully specified from –40°C to +85°C,  
with a maximum operating range to +125°C.  
APPLICATIONS  
•
•
•
Energy Exploration  
Seismic Monitoring  
High-Accuracy Instrumentation  
AVDD  
PGA  
VREFN VREFP  
DVDD  
CLK  
ADS1282  
SCLK  
DOUT  
DIN  
Input 1  
4th-Order  
DS  
Programmable  
Digital Filter  
SPI  
Calibration  
Interface  
Input 2  
Modulator  
DRDY  
VCOM  
Over-Range  
SYNC  
RESET  
PWDN  
Control  
Modulator Output  
3
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
All trademarks are the property of their respective owners.  
PRODUCT PREVIEW information concerns products in the  
formative or design phase of development. Characteristic data and  
other specifications are design goals. Texas Instruments reserves  
the right to change or discontinue these products without notice.  
Copyright © 2007, Texas Instruments Incorporated  
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