ADE5166 datasheet(24/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 24 of 156

TERMINOLOGY

Measurement Error

The error associated with the energy measurement made by the

ADE5166/ADE5169/ADE5566/ADE5569 is defined by the fol-

lowing formula:

Measurement Error =

100

⎟

⎠

⎞

⎜

⎝

⎛

−

Energy

True

Energy

True

Energy

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 corre-

sponding component and ensure a phase match between the

current channel and the 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.

Power Supply Rejection (PSR)

PSR quantifies the ADE5166/ADE5169/ADE5566/ADE5569

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 (100 mV rms/

120 Hz) is introduced onto the supplies. Any error introduced

by this ac signal is expressed as a percentage of the 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 supplies are varied ±5%. Any error

introduced is expressed as a percentage of the reading.

ADC Offset Error

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. 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.

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