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ADS1278-HT

更新时间： 2024-02-11 20:19:49
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德州仪器 - TI 转换器
页数 文件大小 规格书
47页 1208K
描述
OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER

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ADS1278-HT  
www.ti.com  
SBAS447B –MARCH 2009–REVISED MARCH 2010  
OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER  
Check for Samples: ADS1278-HT  
1
FEATURES  
APPLICATIONS  
•
•
•
•
•
•
Down-Hole Drilling  
23  
•
Simultaneously Measure Eight Channels  
High Temperature Environments  
Vibration/Modal Analysis  
Multi-Channel Data Acquisition  
Acoustics/Dynamic Strain Gauges  
Pressure Sensors  
•
•
Up to 128-kSPS Data Rate  
AC Performance:  
62-kHz Bandwidth  
111-dB SNR (High-Resolution Mode)  
–108-dB THD  
DESCRIPTION  
•
•
DC Accuracy:  
0.8-mV/°C Offset Drift  
1.3-ppm/°C Gain Drift  
Based on the single-channel ADS1271, the ADS1278  
(octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital  
converter (ADC) with data rates up to 128 k samples  
per second (SPS), allowing simultaneous sampling of  
eight channels.  
Selectable Operating Modes:  
High-Speed: 128 kSPS, 106 dB SNR  
High-Resolution: 52 kSPS, 111 dB SNR  
Low-Power: 52 kSPS, 31 mW/ch  
Low-Speed: 10 kSPS, 7 mW/ch  
Traditionally, industrial delta-sigma ADCs offering  
good drift performance use digital filters with large  
passband droop. As a result, they have limited signal  
bandwidth and are mostly suited for dc  
measurements. High-resolution ADCs in audio  
applications offer larger usable bandwidths, but the  
offset and drift specifications are significantly weaker  
than respective industrial counterparts. The ADS1278  
combines these types of converters, allowing  
high-precision industrial measurement with excellent  
dc and ac specifications.  
•
•
•
•
•
•
•
•
Linear Phase Digital Filter  
SPI™ or Frame-Sync Serial Interface  
Low Sampling Aperture Error  
Modulator Output Option (digital filter bypass)  
Analog Supply: 5 V  
Digital Core: 1.8 V  
I/O Supply: 1.8 V to 3.3 V  
Currently Available in an 84-Pin HFQ Package  
and a KGD Chiptray Option  
The  
high-order,  
chopper-stabilized  
modulator  
achieves very low drift with low in-band noise. The  
onboard decimation filter suppresses modulator and  
signal out-of-band noise. These ADCs provide a  
usable signal bandwidth up to 90% of the Nyquist  
rate with less than 0.005 dB of ripple.  
SUPPORTS EXTREME TEMPERATURE  
APPLICATIONS  
•
•
•
•
Controlled Baseline  
One Assembly/Test Site  
One Fabrication Site  
Available in Extreme (–55°C/210°C)  
Temperature Range(1)  
Extended Product Life Cycle  
Extended Product-Change Notification  
Product Traceability  
Texas Instruments High Temperature Products  
Utilize Highly Optimized Silicon (Die) Solutions  
With Dsign and Process Enhancements to  
Maximize Performance Over Extended  
Temperatures  
Four operating modes allow for optimization of speed,  
resolution, and power. All operations are controlled  
directly by pins; there are no registers to program.  
The device is fully specified over the extended  
industrial range (–55°C to 210°C) and is available in  
an 84-pin HFQ package and a KGD chiptray option.  
•
•
•
•
(1) Custom temperature ranges available  
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 © 2009–2010, Texas Instruments Incorporated  
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