Datasheet > AD7756ARSRL

AD7756ARSRL

更新时间： 2024-11-23 19:55:51

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管
页数	文件大小	规格书
31页	431K
描述
IC SPECIALTY ANALOG CIRCUIT, PDSO20, SSOP-20, Analog IC:Other

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AD7756ARSRL 数据手册

PRELIMINARYTECHNICALDATA

Active Energy Metering IC

with Serial Interface

AD7756*

FEATURES

High Accuracy, supports IEC 687/1036

Less than 0.1% error over a dynamic

range of 500 to 1

The AD7756 contains a sampled waveform register and an

Active Energy register capable of holding at least 5

seconds of accumulated power at full load. Data is read

from the AD7756 via the serial interface. The AD7756

also provides a pulse output (CF) with a frequency which

is proportional to the active power.

Besides real power information the AD7756 also provides

system calibration features, i.e., channel offset correction,

phase calibration and power calibration. The part also

incorporates a detection circuit for short duration low

voltage variations or sags. The voltage threshold level and

the duration (no. of half line cycles) of the variation are

user programmable. An open drain logic output (SAG)

goes active low when a sag event occurs.

A zero crossing output (ZX) produces an output which is

synchronized to the zero crossing point of the line voltage.

This output can be used to extract timing or frequency

information from the line. The signal is also used internally to

the chip in the calibration mode. This permits faster and more

accurate calibration of the real power calculation. This signal is

also useful for synchronization of relay switching with a

voltage zero crossing, thus improving the relay life by

reducing the risk of arcing.

The interrupt request output is an open drain, active low logic

output. The IRQ output will become active when the accumu-

lated real power register is half full and also when it over flows.

A status register will indicate the nature of the interrupt.

The AD7756 is available in 20 pin DIP and 20 lead SSOP

packages.

An On-Chip user Programmable threshold for line

voltage SAG detection and PSU supervisory.

The AD7756 supplies Sampled Waveform Data

and Active Energy (40 Bits).

Digital Power, Phase & Input Offset Calibration.

An On-Chip temperature sensor ( 3ꢀC typical after calibration)

A SPI compatible Serial Interface.

A pulse output with programmable frequency.

An Interrupt Request line (IRQ) and Status register

provide early warning of register overflow

Proprietary ADCs and DSP provide high accuracy over

large variations in environmental conditions and time.

Reference 2.5V 8% (30 ppm/ꢀC typical)

with external overdrive capability

Single 5V Supply, Low power (15mW typical)

GENERAL DESCRIPTION

The AD7756 is a high accuracy electrical power measurement

IC with a serial interface and a pulse output. The AD7756

incorporates two second order sigma delta ADCs, refer-

ence circuitry, temperature sensor and all the signal

processing required to perform active power and energy

measurement.

FUNTIONAL BLOCK DIAGRAM

DVDD

DGND

AVDD

RESET

PGA

MULTIPLIER

HPF1 MULTIPLIER LPF2

AD7756

V1P

V1N

ADC

SAG

APGAIN[11:0]

TEMP

SENSOR

APOS[11:0]

PHCAL[7:0]

V2P

V2N

DFC

ADC

4kΩ

AD7756 REGISTERS &

SERIAL INTERFACE

2.5V

REFERENCE

CFDIV[11:0]

LPF1

IRQ

AGND

DIN DOUT SCLK CS

CLKIN CLKOUT

REF

IN/OUT

*Patents Pending.

REV. PrI 10/00

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.

Tel1781/329-4700

Fax: 781/326-8703

http://www.analog.com

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与AD7756ARSRL相关器件

型号	品牌	获取价格	描述	数据表
AD7756BN	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDIP20, PLASTIC, DIP-20, Analog IC:Other
AD7756BRS	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO20, SSOP-20, Analog IC:Other
AD775JN	ADI	获取价格	8-Bit 20 MSPS, 60 mW Sampling A/D Converter
AD775JR	ADI	获取价格	8-Bit 20 MSPS, 60 mW Sampling A/D Converter
AD776	ADI	获取价格	16-Bit 100 kSPS Oversampling ADC
AD7760	ADI	获取价格	2.5 MSPS, 20-Bit ADC
AD7760BCP	ADI	获取价格	2.5 MSPS, 20-Bit ADC
AD7760BSV	ADI	获取价格	2.5 MSPS, 20-Bit ADC
AD7760BSVZ	ROCHESTER	获取价格	1-CH 24-BIT DELTA-SIGMA ADC, PARALLEL ACCESS, PQFP64, LEAD FREE, MS-026ACD-HD, TQFP-64
AD7760BSVZ-REEL	ADI	获取价格	2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer

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