AD736JR

更新时间： 2024-01-25 05:17:24

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	220K
描述
Low Cost, Low Power, True RMS-to-DC Converter

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技术参数
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AD736JR 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Not Recommended	零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.07
转换器类型：	RMS TO DC CONVERTER	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
最大线性误差 (EL)：	0.35%	湿度敏感等级：	1
最大负电源电压：	-16.5 V	最小负电源电压：	-3.2 V
标称负供电电压：	-5 V	功能数量：	1
端子数量：	8	最大工作频率：	0.005 MHz
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
最大正输入电压：	1 V	电源：	+-5 V
认证状态：	Not Qualified	座面最大高度：	1.75 mm
子类别：	Analog Special Function Converters	最大压摆率：	0.27 mA
最大供电电压：	16.5 V	最小供电电压：	2.8 V
标称供电电压：	5 V	表面贴装：	YES
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	最大总误差：	2%
宽度：	3.9 mm	Base Number Matches：	1

AD736JR 数据手册

AD736

tions: input amplifier, full-wave rectifier, rms core, output am-

plifier and bias sections. T he FET input amplifier allows

both a high impedance, buffered input (Pin 2) or a low imped-

ance, wide-dynamic-range input (Pin 1). T he high impedance

input, with its low input bias current, is well suited for use with

high impedance input attenuators.

TYP ES O F AC MEASUREMENT

T he AD736 is capable of measuring ac signals by operating as

either an average responding or a true rms-to-dc converter. As

its name implies, an average responding converter computes the

average absolute value of an ac (or ac and dc) voltage or current

by full wave rectifying and low-pass filtering the input signal;

this will approximate the average. T he resulting output, a dc

“average” level, is then scaled by adding (or reducing) gain; this

scale factor converts the dc average reading to an rms equivalent

value for the waveform being measured. For example, the aver-

age absolute value of a sine-wave voltage is 0.636 that of V_PEAK

the corresponding rms value is 0.707 times V_PEAK. T herefore,

for sine-wave voltages, the required scale factor is 1.11 (0.707

divided by 0.636).

T he output of the input amplifier drives a full wave precision

rectifier, which in turn, drives the rms core. It is in the core that

the essential rms operations of squaring, averaging and square

rooting are performed, using an external averaging capacitor,

;

_AV. Without C_AV, the rectified input signal travels through the

core unprocessed, as is done with the average responding con-

nection (Figure 17).

A final subsection, an output amplifier, buffers the output from

the core and also allows optional low-pass filtering to be per-

formed via external capacitor, C_F, connected across the feed-

back path of the amplifier. In the average responding

connection, this is where all of the averaging is carried out. In

the rms circuit, this additional filtering stage helps reduce any

output ripple which was not removed by the averaging capaci-

In contrast to measuring the “average” value, true rms measure-

ment is a “universal language” among waveforms, allowing the

magnitudes of all types of voltage (or current) waveforms to be

compared to one another and to dc. RMS is a direct measure of

the power or heating value of an ac voltage compared to that of

dc: an ac signal of 1 volt rms will produce the same amount of

heat in a resistor as a 1 volt dc signal.

tor, C_AV

Mathematically, the rms value of a voltage is defined (using a

simplified equation) as:

V rms = Avg.(V ²)

T his involves squaring the signal, taking the average, and then

obtaining the square root. T rue rms converters are “smart recti-

fiers”: they provide an accurate rms reading regardless of the

type of waveform being measured. However, average responding

converters can exhibit very high errors when their input signals

deviate from their precalibrated waveform; the magnitude of the

error will depend upon the type of waveform being measured.

As an example, if an average responding converter is calibrated

to measure the rms value of sine-wave voltages, and then is used

to measure either symmetrical square waves or dc voltages, the

converter will have a computational error 11% (of reading)

higher than the true rms value (see T able I).

AD 736 TH EO RY O F O P ERATIO N

As shown by Figure 16, the AD736 has five functional subsec-

Figure 16. AD736 True RMS Circuit

Table I. Error Introduced by an Average Responding Circuit When Measuring Com m on Waveform s

Waveform Type

1 Volt P eak

Am plitude

Crest Factor

(V_{P EAK}/V rm s)

True rm s Value

Average Responding

Circuit Calibrated to

Read rm s Value of

% of Reading Error*

Using Average

Responding Circuit

Sine Waves Will Read

Undistorted

Sine Wave

1.414

0.707 V

Symmetrical

Square Wave

1.00

1.73

1.00 V

1.11 V

+11.0%

–3.8%

Undistorted

T riangle Wave

0.577 V

0.555 V

Gaussian

Noise (98% of

Peaks <1 V)

0.333 V

0.295 V

–11.4%

Rectangular

Pulse T rain

0.5 V

0.1 V

0.278 V

0.011 V

–44%

–89%

SCR Waveforms

50% Duty Cycle

25% Duty Cycle

4.7

0.495 V

0.212 V

0.354 V

0.150 V

–28%

–30%

Average RespondingValue – True rmsValue

*% of Reading Error =

×100%

True rmsValue

–6–

REV. C

1...3 4 567 8

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