ADE7912 datasheet(17/44 Pages) AD

17 / 44 page

Data Sheet

ADE7912/ADE7913

Rev. 0 | Page 17 of 44

Gain Drift over Temperature

This temperature coefficient includes the temperature variation

of the ADC gain and of the internal voltage reference. It repre-

sents 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. Then the

temperature coefficient is computed as follows:

(

)

( )

( ) (

)

( )

( ) (

) 













−

max

Gain

Drift

Gain drift is measured in ppm/°C.

Power Supply Rejection (PSR)

PSR quantifies the 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 the 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 and VM pins

and between the 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). Then PSR = 20

log10 (PSRR).

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the rms value of the actual input signal to the

rms sum of all other spectral components below the Nyquist

frequency, excluding harmonics and dc. The spectral compo-

nents are calculated over a 2 sec window. The value for SNR is

expressed in decibels.

Signal-to-Noise-and-Distortion (SINAD) Ratio

SINAD is the ratio of the rms value of the actual input signal to

the rms sum of all other spectral components below the Nyquist

frequency, including harmonics but excluding dc. The spectral

components are calculated over a 2 sec window. The value for

SINAD is expressed in decibels.

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of all harmonics (excluding the

noise components) to the rms value of the fundamental. The

spectral components are calculated over a 2 sec window. The

value for THD is expressed in decibels.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio of the rms value of the actual input signal to

the rms value of the peak spurious component over the

measurement bandwidth of the waveform samples. The spectral

components are calculated over a 2 sec window. The value of

SFDR is expressed in decibels relative to full scale, dBFS.

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