ADE7933 datasheet(29/120 Pages) AD

29 / 120 page

Data Sheet

ADE7978/ADE7933/ADE7932

Rev. 0 | Page 29 of 120

Gain Error

Gain error in the ADE7933/ADE7932 represents the difference

between the measured ADC output code (minus the offset) and

the ideal output code (see the Current Channel ADC and Voltage

Channel ADCs sections). The difference is expressed as a percent-

age of the ideal code and represents the overall gain error of one

current or voltage channel.

Gain Drift over Temperature

Gain drift is the change in gain over temperature. The gain

temperature coefficient includes the temperature variation of the

ADC gain and of the internal voltage reference. Gain drift over

temperature represents the overall temperature coefficient of one

current or voltage channel. With the internal voltage reference

in use, the ADC gain is measured at −40°C, +25°C, and +85°C.

The temperature coefficient is computed as follows:

Drift =

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)











−

max

Gain

Gain drift is measured in ppm of FS/°C.

Power Supply Rejection (PSR)

PSR quantifies the ADE7978 and ADE7933/ADE7932 chipset

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 when the voltage at the input

pins is 0 V. A second reading is obtained with the same input

signal levels when an ac signal (120 mV rms at 50 Hz or

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

by this ac signal is expressed as a percentage of reading (power

supply rejection ratio, PSRR). PSR = 20 log10 (PSRR).

For the dc PSR measurement, a reading at nominal supplies

(3.3 V) is taken when the voltage between the IP and IM pins is

6.25 mV rms, and the voltages between the V1P, V2P, and VM

pins are 100 mV rms. A second reading is obtained with the

same input signal levels when the power supplies are varied by

±10%. Any error introduced is expressed as a percentage of the

reading (PSRR). PSR = 20 log10 (PSRR).

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