ADE7166 datasheet(19/148 Pages) AD

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Preliminary Technical Data

ADE75xx/ADE71xx

Rev. PrE | Page 19 of 148

TERMINOLOGY

MEASUREMENT ERROR

The error associated with the energy measurement made by the ADE75xx/ADE71xx is defined by the following formula:

100

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

Energy

True

Energy

True

gister

Energy

Error

Percentage

PHASE ERROR BETWEEN CHANNELS

The digital integrator and the high-pass filter (HPF) in the current channel have a non-ideal 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.

POWER SUPPLY REJECTION

This quantifies the ADE75xx/ADE71xx 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.

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.

ADC OFFSET ERROR

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 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

The difference between the measured ADC output code (minus the offset) and the ideal output code—see the Current Channel ADC and

Voltage Channel ADC sections. It is measured for each of the input ranges on the current channel (0.5 V, 0.25 V, and 0.125 V). The

difference is expressed as a percentage of the ideal code.

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