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ADE7755ARSRL Folha de dados(PDF) 11 Page - Analog Devices

Nome de Peças ADE7755ARSRL
Descrição Electrónicos  Energy Metering IC with Pulse Output
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ADE7755ARSRL Folha de dados(HTML) 11 Page - Analog Devices

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ADE7755
Rev. A | Page 11 of 20
TERMINOLOGY
Measurement Error
The error associated with the energy measurement made by the
ADE7755 is defined by the following formula:
%
100
7755
×
=
Energy
True
Energy
True
ADE
the
by
Registered
Energy
Error
Percentage
Phase Error Between Channels
The high-pass filter (HPF) in Channel 1 has a phase lead response.
To offset this phase response and equalize the phase response
between channels, a phase compensation network is also placed
in Channel 1. The phase compensation network matches the
phase to within ±0.1° over a range of 45 Hz to 65 Hz and ±0.2°
over a range of 40 Hz to 1 kHz. See Figure 30 and Figure 31.
Power Supply Rejection (PSR)
The PSR quantifies the ADE7755 measurement error as a
percentage of the reading when the power supplies are varied.
For the ac PSR measurement, a reading at nominal supplies
(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced
onto the supplies and a second reading is obtained under the
same input signal levels. Any error introduced is expressed as a
percentage of the reading (see the Measurement Error definition).
For the dc PSR measurement, a reading at nominal supplies
(5 V) is taken. The supplies are then varied ±5% and a second
reading is obtained with the same input signal levels. Any error
introduced is again expressed as a percentage of the reading.
ADC Offset Error
The ADC offset error refers to the dc offset associated with the
analog inputs to the ADCs. It means that with the analog inputs
connected to AGND, the ADCs still see a small dc signal
(offset). The offset decreases with increasing gain in Channel 1.
This specification is measured at a gain of 1. At a gain of 16, the
dc offset is typically less than 1 mV. However, when the HPF is
switched on, the offset is removed from the current channel,
and the power calculation is not affected by this offset.
Gain Error
The gain error of the ADE7755 is defined as the difference between
the measured output frequency (minus the offset) and the ideal
output frequency. It is measured with a gain of 1 in Channel 1.
The difference is expressed as a percentage of the ideal frequency.
The ideal frequency is obtained from the ADE7755 transfer
function (see the Transfer Function section).
Gain Error Match
The gain error match is defined as the gain error (minus the
offset) obtained when switching between a gain of 1 and a gain
of 2, 8, or 16. It is expressed as a percentage of the output frequency
obtained under a gain of 1. This gives the gain error observed
when the gain selection is changed from 1 to 2, 8, or 16.


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