AD737KN

更新时间： 2024-11-22 23:16:15

品牌	Logo	应用领域
亚德诺 - ADI		转换器模拟特殊功能转换器光电二极管
页数	文件大小	规格书
8页	152K
描述
Low Cost, Low Power, True RMS-to-DC Converter

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AD737KN 数据手册

Low Cost, Low Power,

True RMS-to-DC Converter

AD737*

FEATURES

FUNCTIONAL BLOCK DIAGRAM

COMPUTES

True RMS Value

Average Rectified Value

Absolute Value

AD737

8k⍀

COM

FULL

WAVE

RECTIFIER

PROVIDES

200 mV Full-Scale Input Range

(Larger Inputs with Input Attenuator)

Direct Interfacing with 3 1/2 Digit

CMOS A/D Converters

8k⍀

INPUT

AMPLIFIER

BIAS

SECTION

POWER

DOWN

OUTPUT

RMS CORE

High Input Impedance of 10¹²

⍀

Low Input Bias Current: 25 pA max

–V

High Accuracy: ؎0.2 mV ؎0.3% of Reading

RMS Conversion with Signal Crest Factors Up to 5

Wide Power Supply Range: +2.8 V, –3.2 V to ؎16.5 V

Low Power: 160 ␮A max Supply Current

No External Trims Needed for Specified Accuracy

AD736—A General Purpose, Buffered Voltage

Output Version Also Available

PRODUCT DESCRIPTION

The AD737 allows the choice of two signal input terminals: a

high impedance (10¹²Ω) FET input which will directly interface

with high Z input attenuators and a low impedance (8 kΩ) input

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.

The AD737 is a low power, precision, monolithic true rms-to-dc

converter. It is laser trimmed to provide a maximum error of

±0.2 mV ±0.3% of reading with sine-wave inputs. Furthermore,

it maintains high accuracy while measuring a wide range of

input waveforms, including variable duty cycle pulses and triac

(phase) controlled sine waves. The low cost and small physical

size of this converter make it suitable for upgrading the per-

formance of non-rms “precision rectifiers” in many applications.

Compared to these circuits, the AD737 offers higher accuracy at

equal or lower cost.

The AD737 achieves a 1% of reading error bandwidth exceed-

ing 10 kHz for input amplitudes from 20 mV rms to 200 mV

rms while consuming only 0.72 mW.

The AD737 is available in four performance grades. The

AD737J and AD737K grades are rated over the commercial

temperature range of 0°C to +70°C. The AD737A and AD737B

grades are rated over the industrial temperature range of –40°C

to +85°C.

The AD737 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 AD737 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.

The AD737 is available in three low-cost, 8-lead packages: plas-

tic DIP, plastic SO and hermetic cerdip.

PRODUCT HIGHLIGHTS

1. The AD737 is capable of computing the average rectified

value, absolute value or true rms value of various input

signals.

The AD737 has no output buffer amplifier, thereby significantly

reducing dc offset errors occuring at the output. This allows the

device to be highly compatible with high input impedance A/D

converters.

2. Only one external component, an averaging capacitor, is

required for the AD737 to perform true rms measurement.

Requiring only 160 µA of power supply current, the AD737 is

optimized for use in portable multimeters and other battery

powered applications. This converter also provides a “power

down” feature which reduces the power supply standby current

to less than 30 µA.

3. The low power consumption of 0.72 mW makes the AD737

suitable for many battery powered applications.

*Protected under U.S. Patent Number 5,495,245.

REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

12 3 4 5 6 7 8

中文翻译

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AD737KN 替代型号

型号	品牌	替代类型	描述	数据表
AD736JNZ	ADI	功能相似	Low Cost, Low Power, True RMS-to-DC Converter
AD737JRZ	ADI	功能相似	Low Cost, Low Power, True RMS-to-DC Converter
AD736JRZ	ADI	功能相似	Low Cost, Low Power, True RMS-to-DC Converter

与AD737KN相关器件

型号	品牌	获取价格	描述	数据表
AD737KNZ	ADI	获取价格	暂无描述
AD737KR	ROCHESTER	获取价格	RMS TO DC CONVERTER, 0.005MHz, PDSO8, MS-012AA, SOIC-8
AD737KR	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737KR-REEL	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737KR-REEL7	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737KRZ	ADI	获取价格	暂无描述
AD737KRZ-R7	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737KRZ-RL	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD7380	ADI	获取价格	Dual, Simultaneous Sampling SAR ADCs, Differential Inputs
AD7380-4	ADI	获取价格	Differential Input, Quad, External Reference Simultaneous Sampling, 16-Bit, SAR ADC

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