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ADS1174_14

更新时间： 2024-02-15 13:57:24
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德州仪器 - TI /
页数 文件大小 规格书
39页 972K
描述
Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters

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ADS1174_14 数据手册

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ADS1174  
ADS1178  
www.ti.com ........................................................................................................................................ SBAS373B–OCTOBER 2007–REVISED SEPTEMBER 2008  
Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters  
1
FEATURES  
DESCRIPTION  
234  
•
Simultaneously Sample Four/Eight Channels  
The ADS1174 (quad) and ADS1178 (octal) are  
multiple delta-sigma (ΔΣ) analog-to-digital converters  
(ADCs) with data rates up to 52k samples-per-second  
(SPS), which allow synchronous sampling of four and  
eight channels. These devices use identical  
packages, and are also compatible with the  
high-performance 24-bit ADS1274 and ADS1278,  
permitting drop-in upgrades.  
•
•
Selectable Operating Modes:  
High-Speed: 52kSPS Data Rate, 31mW/ch  
Low-Power: 10kSPS Data Rate, 7mW/ch  
AC Performance:  
25kHz Bandwidth  
97dB SNR  
–105dB THD  
The delta-sigma architecture offers near ideal 16-bit  
ac performance (97dB SNR, –105dB THD, 1LSB  
linearity) combined with 0.005dB passband ripple and  
linear phase response.  
•
•
DC Performance:  
2µV/°C Offset Drift  
2ppm/°C Gain Drift  
Digital Filter:  
The  
high-order,  
chopper-stabilized  
modulator  
Linear Phase Response  
Passband Ripple: ±0.005dB  
Stop Band Attenuation: 100dB  
achieves very low drift (2µV/°C offset, 2ppm/°C gain)  
and low noise (1LSBPP). The on-chip finite impulse  
response (FIR) filter provides  
a usable signal  
bandwidth up to 90% of the Nyquist rate with 100dB  
of stop band attenuation while suppressing modulator  
and signal out-of-band noise.  
•
Selectable SPI™ or Frame Sync Serial  
Interface  
•
•
•
•
•
•
Simple Pin-Driven Control  
Low Sampling Aperture Error  
Specified from –40°C to +105°C  
Analog Supply: 5V  
Two operating modes allow for optimization of speed  
and power: High-speed mode (31mW/Ch at 52kSPS),  
and Low-power mode (7mW/Ch at 10kSPS).  
A
SYNC input control pin allows the device  
I/O Supply: 1.8V to 3.3V  
Digital Core Supply: 1.8V  
conversions to be started and synchronized to an  
external event. SPI and Frame-Sync serial interfaces  
are supported. The device is fully specified over the  
extended industrial range (–40°C to +105°C) and is  
available in an HTQFP-64 PowerPAD™ package.  
APPLICATIONS  
•
•
•
•
3-Phase Power Monitors  
Defibrillators and ECG Monitors  
Coriolis Flow Meters  
Vibration/Modal Analysis  
VREFP VREFN AVDD DVDD  
IOVDD  
VREFP VREFN AVDD  
DVDD  
IOVDD  
DS  
DS  
DS  
DS  
Input1  
Input2  
Input3  
Input4  
Input1  
Input2  
Input3  
Input4  
Input5  
Input6  
Input7  
Input8  
SPI  
and  
SPI  
and  
DRDY/FSYNC  
SCLK  
DRDY/FSYNC  
SCLK  
DS  
DS  
DS  
Frame-  
Sync  
Frame-  
Sync  
DOUT[4:1]  
DIN  
DOUT[8:1]  
DIN  
Interface  
Interface  
Four  
Digital  
Filters  
DS  
DS  
DS  
DS  
DS  
Eight  
Digital  
Filters  
TEST[1:0]  
FORMAT[2:0]  
CLK  
TEST[1:0]  
FORMAT[2:0]  
CLK  
Control  
Logic  
Control  
Logic  
SYNC  
SYNC  
PWDN[4:1]  
CLKDIV  
MODE  
PWDN[8:1]  
CLKDIV  
MODE  
AGND  
DGND  
AGND  
DGND  
ADS1174  
ADS1178  
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
4
PowerPAD is a trademark of Texas Instruments.  
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 © 2007–2008, Texas Instruments Incorporated  
1234567...39

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