ADE7757A Series

Single Phase Energy Metering IC with Integrated Oscillator and Reverse Power Indication

Catalog

Single Phase Energy Metering IC with Integrated Oscillator and Reverse Power Indication

Part	Voltage - I/O Low	Meter Type	Measurement Error	Operating Temperature [Max]	Operating Temperature [Min]	Current - Supply	Voltage - I/O High [custom]	Mounting Type	Input Impedance	Package / Case	Package / Case [x]	Package / Case [y]	Voltage - Supply [Min]	Voltage - Supply [Max]	Supplier Device Package
Analog Devices AD71056ARZ	0.8 V	Single Phase	0.1 %	85 °C	-40 °C	5 mA	2.4 V	Surface Mount	320 kOhm	16-SOIC	0.154 in	3.9 mm	4.75 V	5.25 V	16-SOIC

Catalog

Single Phase Energy Metering IC with Integrated Oscillator and Reverse Power Indication

Key Features

• Current sensor interface for current transformers or shunts

• Less than 0.1% Active Energy Error Over Dynamic Range of 500:1

• Active Energy Measurement

• High Frequency Pulse Output

• Exceeds IEC62053-21

• On-chip Temperature Sensor and Voltage Reference (2.45 V)

• Low Power (20 mW typical)

• Reverse Power Indication (REVP)

Description

The ADE7757A (AD71056) is an accurate electrical energy measurement integrated circuit. It is a pin reduction version of ADE7755 with an enhancement of a precise oscillator circuit that serves as a clock source to the chip. The ADE7757A eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter built with this IC. The chip directly interfaces with shunt resistor.The ADE7757A provides instantaneous and average real power based on line current and voltage. The part specifications surpass the accuracy requirements as quoted in the IEC61036 standard. The only analog circuitry used in the ADE7757A is in the ADCs and reference circuit. All other signal processing (e.g., multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time.The small analog input full-scale allows the chip to interface to low value shunt resistances without losing dynamic range. The ADE7757A is available in 16-lead SOIC narrow-body package.TheApplication Note AN-679can be used as a basis for a description of an IEC62053-21 low cost, watt-hour meter reference design.NOTE: For polyphase system designs, theADE7752Ais recommended.