AD737ARZ

更新时间： 2024-11-23 12:28:35

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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AD737ARZ 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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AD737ARZ 替代型号

型号	品牌	替代类型	描述	数据表
AD736ARZ	ADI	类似代替	Low Cost, Low Power, True RMS-to-DC Converter
AD737JRZ	ADI	类似代替	Low Cost, Low Power, True RMS-to-DC Converter
AD736JRZ	ADI	类似代替	Low Cost, Low Power, True RMS-to-DC Converter

与AD737ARZ相关器件

型号	品牌	获取价格	描述	数据表
AD737BQ	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737BQ	ROCHESTER	获取价格	RMS TO DC CONVERTER, 0.005MHz, CDIP8, CERAMIC, DIP-8
AD737-EVALZ	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737JN	ROCHESTER	获取价格	RMS TO DC CONVERTER, 0.005MHz, PDIP8, PLASTIC, MS-001, DIP-8
AD737JN	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737JNZ	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737JR	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter
AD737JR	ROCHESTER	获取价格	RMS TO DC CONVERTER, 0.005MHz, PDSO8, MS-012AA, SOIC-8
AD737JR-5	ROCHESTER	获取价格	RMS TO DC CONVERTER, 0.005MHz, PDSO8, MS-012AA, SOIC-8
AD737JR-REEL	ADI	获取价格	Low Cost, Low Power, True RMS-to-DC Converter

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