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AD736KN PDF预览

AD736KN

更新时间: 2024-02-16 00:50:45
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
8页 220K
描述
Low Cost, Low Power, True RMS-to-DC Converter

AD736KN 数据手册

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Low Cost, Low Power,  
True RMS-to-DC Converter  
a
AD736  
FUNCTIO NAL BLO CK D IAGRAM  
FEATURES  
COMPUTES  
True RMS Value  
Average Rectified Value  
Absolute Value  
PROVIDES  
200 m V Full-Scale Input Range  
(Larger Inputs w ith Input Attenuator)  
High Input Im pedance of 1012  
Low Input Bias Current: 25 pA m ax  
High Accuracy: ؎0.3 m V ؎0.3% of Reading  
RMS Conversion w ith Signal Crest Factors Up to 5  
Wide Pow er Supply Range: +2.8 V, –3.2 V to ؎16.5 V  
Low Pow er: 200 A m ax Supply Current  
Buffered Voltage Output  
No External Trim s Needed for Specified Accuracy  
AD737—An Unbuffered Voltage Output Version w ith  
Chip Pow er Dow n Is Also Available  
which allows the measurement of 300 mV input levels, while  
operating from the minimum power supply voltage of +2.8 V,  
–3.2 V. The two inputs may be used either singly or differentially.  
T he AD736 achieves a 1% of reading error bandwidth exceeding  
10 kHz for input amplitudes from 20 mV rms to 200 mV rms  
while consuming only 1 mW.  
P RO D UCT D ESCRIP TIO N  
T he AD736 is a low power, precision, monolithic true  
rms-to-dc converter. It is laser trimmed to provide a maximum  
error of ±0.3 mV ±0.3% of reading with sine-wave inputs. Fur-  
thermore, it maintains high accuracy while measuring a wide  
range of input waveforms, including variable duty cycle pulses  
and triac (phase) controlled sine waves. T he low cost and small  
physical size of this converter make it suitable for upgrading the  
performance of non-rms “precision rectifiers” in many applica-  
tions. Compared to these circuits, the AD736 offers higher ac-  
curacy at equal or lower cost.  
T he AD736 is available in four performance grades. T he  
AD736J and AD736K grades are rated over the commercial tem-  
perature range of 0°C to +70°C. T he AD736A and AD736B  
grades are rated over the industrial temperature range of –40°C  
to +85°C.  
T he AD736 is available in three low-cost, 8-pin packages: plastic  
mini-DIP, plastic SO and hermetic cerdip.  
T he AD736 can compute the rms value of both ac and dc input  
voltages. It can also be operated ac coupled by adding one ex-  
ternal capacitor. In this mode, the AD736 can resolve input sig-  
nal levels of 100 µV rms or less, despite variations in  
temperature or supply voltage. High accuracy is also maintained  
for input waveforms with crest factors of 1 to 3. In addition,  
crest factors as high as 5 can be measured (while introducing  
only 2.5% additional error) at the 200 mV full-scale input level.  
P RO D UCT H IGH LIGH TS  
1. T he AD736 is capable of computing the average rectified  
value, absolute value or true rms value of various input  
signals.  
2. Only one external component, an averaging capacitor, is  
required for the AD736 to perform true rms measurement.  
3. T he low power consumption of 1 mW makes the AD736  
suitable for many battery powered applications.  
4. A high input impedance of 1012  
T he AD736 has its own output buffer amplifier, thereby provid-  
ing a great deal of design flexibility. Requiring only 200 µA of  
power supply current, the AD736 is optimized for use in por-  
table multimeters and other battery powered applications.  
eliminates the need for an  
external buffer when interfacing with input attenuators.  
5. A low impedance input is available for those applications  
requiring up to 300 mV rms input signal operating from low  
power supply voltages.  
T he AD736 allows the choice of two signal input terminals: a  
high impedance (1012 ) FET input which will directly interface  
with high Z input attenuators and a low impedance (8 k) input  
REV. C  
Inform ation furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assum ed by Analog Devices for its  
use, nor for any infringem ents of patents or other rights of third parties  
which m ay result from its use. No license is granted by im plication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.  
Tel: 617/ 329-4700  
Fax: 617/ 326-8703  

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