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DataSheet
TERMINOLOGY
Measurement Error
The error associated with the energy measurement made by the
ADE7816 is defined by the following equation:
Measurement Error =
Energy Registered by ADE7816 ? True Energy
True 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
ADE7816
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.
Rev. A | Page 15 of 48
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