AD737KRZ-RL

更新时间： 2024-02-13 01:22:58

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
24页	499K
描述
Low Cost, Low Power, True RMS-to-DC Converter

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技术参数
数据手册

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AD737KRZ-RL 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.23
Samacsys Description：	Low Cost, Low Power, True RMS-to-DC Converter	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：	0.21 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：	NOT SPECIFIED
最大总误差：	2%	宽度：	3.9 mm

AD737KRZ-RL 数据手册

Low Cost, Low Power,

True RMS-to-DC Converter

Data Sheet

AD737

FEATURES

Computes

FUNCTIONAL BLOCK DIAGRAM

COM

8kΩ

True rms value

Average rectified value

Absolute value

Provides

ABSOLUTE

VALUE

CIRCUIT

OUTPUT

SQUARER

DIVIDER

200 mV full-scale input range (larger inputs with

input scaling)

BIAS

SECTION

Direct interfacing with 3½ digit CMOS ADCs

POWER

DOWN

–V

High input impedance: 10¹²

Ω

Low input bias current: 25 pA maximum

High accuracy: 0.2 mV 0.3% of reading

Figure 1.

RMS conversion with signal crest factors up to 5

Wide power supply range: 2.5 V to 16.5 V

Low power: 25 µA (typical) standby current

No external trims needed for specified accuracy

The AD737 output is negative-going; the AD736 is a positive

output-going version of the same basic device

GENERAL DESCRIPTION

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 performance of non-rms precision rectifiers in many

applications. Compared to these circuits, the AD737 offers

higher accuracy at equal or lower cost.

The AD737 has both high (10¹²Ω) and low impedance input

options. The high-Z FET input connects high source impedance

input attenuators, and a low impedance (8 kΩ) input accepts

rms voltages to 0.9 V while operating from the minimum power

supply voltage of 2.5 V. The two inputs can be used either

single ended or differentially.

The AD737 achieves 1% of reading error bandwidth, exceeding

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

while consuming only 0.72 mW.

The AD737 is available in two performance grades. The AD737J

and AD737K grades operate over the commercial temperature

range of 0°C to 70°C. The AD737JR-5 is tested with supply

voltages of 2.5 V dc. The AD737A grade operates over the

industrial temperature range of −40°C to +85°C. The AD737 is

available in two low cost, 8lead packages: PDIP and SOIC_N.

The AD737 can compute the rms value of both ac and dc input

voltages. It can also be operated ac-coupled by adding one

external capacitor. In this mode, the AD737 can resolve input

signal levels of 100 µV rms or less, despite variations in tem-

perature 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.

PRODUCT HIGHLIGHTS

1. Computes average rectified, absolute, or true rms value of a

signal regardless of waveform.

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

required for the AD737 to perform true rms measurement.

3. The standby power consumption of 125 μW makes the

AD737 suitable for battery-powered applications.

The AD737 has no output buffer amplifier, thereby significantly

reducing dc offset errors occurring at the output, which makes

the device highly compatible with high input impedance ADCs.

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

optimized for use in portable multimeters and other battery-

powered applications. In power-down mode, the standby supply

current in is typically 25 µA.

Rev. I

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

rightsof third parties that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks are the property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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