ADE7768

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Single Phase Energy Metering IC with Integrated Oscillator and Positive Only Accumulation

Data Sheet (Rev. A) Product Selection Table

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Overview

Exceeds IEC61036/60687
Less than 0.1% Active Energy Error Over Dynamic Range of 500:1
Active Energy Measurement
High Frequency Pulse Output
Reverse Power Indication (REVP)

Current sensor interface for current transformers or shunts
On-chip Temperature Sensor and Voltage Reference (2.5 V)
Low Power (20 mW typical)

The ADE7768 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 ADE7768 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 ADE7768 provides instantaneous and average real power based on line current and voltage, and only accumulates when the power is positive – ignoring negative power. The part specifications surpass the accuracy requirements as quoted in the IEC61036 standard. The only analog circuitry used in the ADE7768 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 ADE7768 is available in 16-lead SOIC narrow-body package.

The Application Note AN-679 can be used as a basis for a description of an IEC61036 low cost, watt-hour meter reference design.

NOTE: For polyphase system designs, the ADE7752A is recommended.