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ADE7762
(Rev.:Rev0)

Polyphase Energy Metering IC with Phase Drop Indication

Analog Devices 

TERMINOLOGY

Measurement Error

The error associated with the energy measurement made by the

ADE7762 is defined by the following formula:

Percentage Error =

⎜⎜⎝⎛

Energy

Registered by ADE7762

True Energy

–

True

Energy

⎟⎟⎠⎞

×

100 %

(1)

Error Between Channels

The high-pass filter (HPF) in the current channel has a phase

lead response. To offset this phase response and equalize the

phase response between channels, a phase correction network

is placed in the current channel. The phase correction network

ensures a phase match between the current channels and the

voltage channels 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 24 and

Figure 25).

Power Supply Rejection (PSR)

This quantifies the ADE7762 measurement error as a percent-

age of reading when the power supplies are varied.

For the ac PSR measurement, a reading at a nominal supply

(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced

onto the supply, and a second reading is obtained under the

same input signal levels. Any error introduced is expressed as a

percentage of reading. See the definition for Measurement Error.

For the dc PSR measurement, a reading at nominal supplies

(5 V) is taken. The supply is 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 reading.

ADE7762

ADC Offset Error

This 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 an analog input signal offset.

However, because the HPF is always present, the offset is re-

moved from the current channel, and the power calculation

is not affected by this offset.

Gain Error

The gain error of the ADE7762 is defined as the difference

between the measured output frequency (minus the offset)

and the ideal output frequency. The difference is expressed

as a percentage of the ideal frequency. The ideal frequency is

obtained from the ADE7762 transfer function (see the Transfer

Function section).

Rev. 0 | Page 11 of 28

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