AD7751AARS

更新时间： 2024-02-17 03:37:17

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	250K
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Energy Metering IC With On-Chip Fault Detection

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AD7751AARS 数据手册

Energy Metering IC

With On-Chip Fault Detection

AD7751*

FEATURES

The only analog circuitry used in the AD7751 is in the ADCs

and reference circuit. All other signal processing (e.g., multipli-

cation and filtering) is carried out in the digital domain. This

approach provides superior stability and accuracy over extremes

in environmental conditions and over time.

High Accuracy, Supports 50 Hz/60 Hz IEC 687/1036

Less than 0.1% Error Over a Dynamic Range of 500 to 1

Supplies Average Real Power on the Frequency

Outputs F1 and F2

High-Frequency Output CF Is Intended for Calibration

and Supplies Instantaneous Real Power

Continuous Monitoring of the Phase and Neutral

Current Allows Fault Detection in Two-Wire

Distribution Systems

AD7751 Uses the Larger of the Two Currents (Phase

or Neutral) to Bill—Even During a Fault Condition

Two Logic Outputs (FAULT and REVP) Can be Used to

Indicate a Potential Miswiring or Fault Condition

Direct Drive for Electromechanical Counters and

Two-Phase Stepper Motors (F1 and F2)

A PGA in the Current Channel Allows the Use of Small

Values of Shunt and Burden Resistance

Proprietary ADCs and DSP Provide High Accuracy Over

Large Variations in Environmental Conditions and Time

On-Chip Power Supply Monitoring

On-Chip Creep Protection (No Load Threshold)

On-Chip Reference 2.5 V ؎ 8% (30 ppm/؇C Typical)

with External Overdrive Capability

The AD7751 incorporates a novel fault detection scheme that

warns of fault conditions and allows the AD7751 to continue

accurate billing during a fault event. The AD7751 does this

by continuously monitoring both the phase and neutral (re-

turn) currents. A fault is indicated when these currents differ by

more than 12.5%. Billing is continued using the larger of the

two currents.

The AD7751 supplies average real power information on the

low-frequency outputs F1 and F2. These logic outputs may be

used to directly drive an electromechanical counter or interface

to an MCU. The CF logic output gives instantaneous real power

information. This output is intended to be used for calibration

purposes.

The AD7751 includes a power supply monitoring circuit on the

AV_DDsupply pin. The AD7751 will remain in a reset condition

until the supply voltage on AV_DDreaches 4 V. If the supply falls

below 4 V, the AD7751 will also be reset and no pulses will be

issued on F1, F2, and CF.

Single 5 V Supply, Low Power (15 mW Typical)

Low-Cost CMOS Process

Internal phase matching circuitry ensures that the voltage and

current channels are matched whether the HPF in Channel 1 is

on or off. The AD7751 also has anticreep protection.

GENERAL DESCRIPTION

The AD7751 is a high-accuracy fault-tolerant electrical energy

measurement IC that is intended for use with 2-wire distribution

systems. The part specifications surpass the accuracy require-

ments as quoted in the IEC1036 standard.

The AD7751 is available in 24-lead DIP and SSOP packages.

FUNCTIONAL BLOCK DIAGRAM

FAULT

AC/DC DV

DGND

G0 G1

AGND

AD7751

POWER

SUPPLY MONITOR

SIGNAL

PROCESSING

BLOCK

A<>B

V1A

V1N

V1B

...110101...

ADC

PGA

HPF

A>B

⌽

PHASE

...110101...

ADC

CORRECTION

MULTIPLIER

B>A

PGA

LPF

V2P

V2N

...11011001...

ADC

DIGITAL-TO-FREQUENCY

CONVERTER

4k⍀

2.5V

REFERENCE

REF

CLKIN CLKOUT SCF S0 S1 REVP CF

F2RESET

IN/OUT

*US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469.

REV. A

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...16

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AD7751AARS 替代型号

型号	品牌	替代类型	描述	数据表
AD7751ARS	ADI	功能相似	IC SPECIALTY ANALOG CIRCUIT, PDSO24, SSOP-24, Analog IC:Other

与AD7751AARS相关器件

型号	品牌	获取价格	描述	数据表
AD7751ABRS	ADI	获取价格	Energy Metering IC With On-Chip Fault Detection
AD7751AN	ADI	获取价格	暂无描述
AD7751AR	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO24, SOIC-24, Analog IC:Other
AD7751ARS	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO24, SSOP-24, Analog IC:Other
AD7751BN	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDIP24, PLASTIC, DIP-24, Analog IC:Other
AD7751BRS	ETC	获取价格	Power Metering
AD7754ARS	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO24, SSOP-24, Analog IC:Other
AD7754BRS	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO24, SSOP-24, Analog IC:Other
AD7755	ADI	获取价格	Energy Metering IC with Pulse Output
AD7755AAN	ADI	获取价格	Energy Metering IC with Pulse Output

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