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LTC1968

更新时间： 2024-09-24 11:42:07
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
38页 369K
描述
Precision Micropower RMS-to-DC Converter

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中文翻译

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LTC1968 数据手册

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LTC1966  
Precision Micropower  
∆∑ RMS-to-DC Converter  
FeaTures  
DescripTion  
The LTC®1966 is a true RMS-to-DC converter that utilizes  
an innovative patented DS computational technique. The  
internal delta sigma circuitry of the LTC1966 makes it sim-  
pler to use, more accurate, lower power and dramatically  
more flexible than conventional log antilog RMS-to-DC  
converters.  
n
Simple to Use, Requires One Capacitor  
n
True RMS DC Conversion Using DS Technology  
n
High Accuracy:  
0.1% Gain Accuracy from 50Hz to 1kHz  
0.25% Total Error from 50Hz to 1kHz  
High Linearity:  
n
0.02% Linearity Allows Simple System Calibration  
The LTC1966 accepts single-ended or differential input  
signals(forEMI/RFIrejection)andsupportscrestfactorsup  
to 4. Common mode input range is rail-to-rail. Differential  
n
Low Supply Current:  
155µA Typ, 170µA Max  
Ultralow Shutdown Current:  
0.1µA  
Constant Bandwidth:  
n
input range is 1V  
, and offers unprecedented linearity.  
PEAK  
Unlike previously available RMS-to-DC converters, the  
superiorlinearityoftheLTC1966allowshasslefreesystem  
calibration at any input voltage.  
n
Independent of Input Voltage  
800kHz –3dB, 6kHz 1%  
Flexible Supplies:  
The LTC1966 also has a rail-to-rail output with a separate  
output reference pin providing flexible level shifting. The  
LTC1966 operates on a single power supply from 2.7V to  
5.5V or dual supplies up to 5.5V. A low power shutdown  
mode reduces supply current to 0.5µA.  
n
2.7V to 5.5V Single Supply  
Up to 5.5V Dual Supply  
n
Flexible Inputs:  
Differential or Single-Ended  
The LTC1966 is insensitive to PC board soldering and  
stresses, as well as operating temperature. The LTC1966  
is packaged in the space saving MSOP package which is  
ideal for portable applications.  
Rail-to-Rail Common Mode Voltage Range  
Up to 1V  
Differential Voltage  
PEAK  
Flexible Output:  
n
Rail-to-Rail Output  
Separate Output Reference Pin Allows Level Shifting  
Wide Temperature Range:  
–55°C to 125°C  
applicaTions  
n
n
n
True RMS Digital Multimeters and Panel Meters  
n
Small Size:  
True RMS AC + DC Measurements  
Space Saving 8-Pin MSOP Package  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
No Latency DS is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 6359576, 6362677,  
6516291 and 6651036.  
Quantum Leap in Linearity Performance  
Typical applicaTion  
0.2  
LTC1966, ∆∑  
0
Single Supply RMS-to-DC Converter  
2.7V TO 5.5V  
–0.2  
–0.4  
V
DD  
OUTPUT  
LTC1966  
OUT RTN  
GND  
IN1  
IN2  
C
DIFFERENTIAL  
INPUT  
+
–
AVE  
V
OUT  
1µF  
–0.6  
CONVENTIONAL  
LOG/ANTILOG  
1966 TA01  
EN  
V
SS  
0.1µF  
OPT. AC  
COUPLING  
–0.8  
60Hz SINEWAVES  
–1.0  
0
50 100 150 200 250 300 350 400 450 500  
V
(mV AC  
)
RMS  
IN  
1966 TA01b  
1966fb  
1
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