ADE7569 datasheet(22/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 22 of 144

TERMINOLOGY

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 supplies are varied ±5%. Any error

introduced is again expressed as a percentage of the reading.

Measurement Error

The error associated with the energy measurement made by the

ADE7566/ADE7569/ADE7166/ADE7169 is defined by the

following formula:

ADC Offset Error

100

⎟

⎠

⎞

⎜

⎝

⎛

−

Energy

True

Energy

True

Energy

Error

Percentage

ADC offset error is 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 dc analog input

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

input range selection (see the

Phase Error Between Channels

The digital integrator and the high-pass filter (HPF) in the

current channel have a nonideal phase response. To offset this

phase response and equalize the phase response between

channels, two phase correction networks are placed in the

current channel: one for the digital integrator and the other for

the HPF. The phase correction networks correct the phase

response of the corresponding component and ensure a phase

match between current channel and voltage channel to within

±0.1° over a range of 45 Hz to 65 Hz with the digital integrator

off. With the digital integrator on, the phase is corrected to

within ±0.4° over a range of 45 Hz to 65 Hz.

Typical Performance

Characteristics section). However, when HPF1 is switched on,

the offset is removed from the current channel, and the power

calculation is not affected by this offset. The offsets can be

removed by performing an offset calibration (see the Analog

Inputs section).

Gain Error

Gain error is the difference between the measured ADC output

code (minus the offset) and the ideal output code (see the

Current Channel ADC section and the Voltage Channel ADC

section). It is measured for each of the gain settings on the

current channel (1, 2, 4, 8, and 16). The difference is expressed

as a percentage of the ideal code.

Power Supply Rejection (PSR)

PSR quantifies the ADE7566/ADE7569/ADE7166/ADE7169

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 (100 mV rms/120 Hz)

signal is introduced onto the supplies. Any error introduced by

this ac signal is expressed as a percentage of reading (see the

Measurement Error definition).

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