ADE7816 datasheet(15/48 Pages) AD

15 / 48 page

Data Sheet

ADE7816

Rev. 0 | Page 15 of 48

TERMINOLOGY

Measurement Error

The error associated with the energy measurement made by the

ADE7816 is defined by the following equation:

Measurement Error =

100





Energy

True

Energy

True

ADE7816

Registered

Energy

Phase Error Between Channels

The high-pass filter (HPF) and digital integrator introduce

a slight phase mismatch between the current channels and the

voltage channel. The all digital design ensures that the phase

matching between the current channels and voltage channel in

all three phases is within ±0.1° over a range of 45 Hz to 65 Hz

and ±0.2° over a range of 40 Hz to 1 kHz. This internal phase

mismatch can be combined with the external phase error (from

current sensor or component tolerance) and calibrated with the

phase calibration registers.

Power Supply Rejection (PSR)

PSR quantifies the ADE7816 measurement error as a percentage

of reading when the power supplies are varied. For the ac PSR

measurement, a reading at nominal supplies (3.3 V) is taken.

A second reading is obtained with the same input signal levels

when an ac signal (120 mV rms at 100 Hz) is introduced onto the

supplies. Any error introduced by this ac signal is expressed as a

percentage of reading (see the Measurement Error definition).

For the dc PSR measurement, a reading at nominal supplies

(3.3 V) is taken. A second reading is obtained with the same

input signal levels when the power supplies are varied ±10%.

Any error introduced is expressed as a percentage of the reading.

ADC Offset Error

ADC offset error refers to the dc offset that is associated with

the analog inputs to the ADCs. It means that

, with the analog

inputs connected to AGND, the ADCs still see a dc analog input

signal. The magnitude of the offset depends on the gain and input

range selection (see the Typical Performance Characteristics

section). However, the HPF removes the offset from the current

channels and voltage channel, and the power calculation remains

unaffected by this offset.

Gain Error

The gain error in the ADCs of the ADE7816 is defined as the

difference between the measured ADC output code (minus the

offset) and the ideal output code. The difference is expressed as

a percentage of the ideal code.

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