GENERAL DESCRIPTION

The ADE7755 is a high accuracy electrical energy measurement IC. The part specifications surpass the accuracy requirements as quoted in the IEC 1036 standard.

The only analog circuitry used in the ADE7755 is in the ADCs and reference circuit. All other signal processing (for example, 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 ADE7755 supplies average active power information on the low frequency outputs, F1 and F2. These logic outputs can be used to directly drive an electromechanical counter or interface to an MCU. The CF logic output gives instantaneous active power information. This output is intended to be used for calibration purposes or for interfacing to an MCU.

FEATURES

High accuracy, surpasses 50 Hz/60 Hz IEC 687/IEC 1036

Less than 0.1 error over a dynamic range of 500 to 1

Supplies active power on the frequency outputs, F1 and F2

High frequency output CF is intended for calibration and supplies instantaneous active power

Synchronous CF and F1/F2 outputs

Logic output REVP provides information regarding the sign of the active power

Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)

Programmable gain amplifier (PGA) in the current channel facilitates usage of small shunts and burden resistors

Proprietary ADCs and DSPs 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

Single 5 V supply, low power (15 mW typical)

Low cost CMOS process