ADE9078 datasheet(22/108 Pages) AD

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Data Sheet

ADE9078

Rev. 0 | Page 21 of 107

AC Power Supply Rejection (PSRR)

AC PSRR quantifies the measurement error as a percentage of

reading when the dc power supply is VNOM and modulated with

ac and the inputs are grounded. For the ac PSRR measurement,

20 sec of samples is captured with nominal supplies (3.3 V) and a

second set are captured with an additional ac signal (330 mV peak

at 50 Hz) introduced onto the supplies. Then, the PSRR is

expressed as PSRR = 20 log10(V2/V1).

Signal-to-Noise Ratio (SNR)

SNR is calculated by inputting a 50 Hz signal, and samples are

acquired for 2 sec. The amplitudes for each frequency up to the

bandwidth given in Table 1 as the ADC output bandwidth (−3 dB)

are calculated. To determine the SNR, the signal at 50 Hz is

compared to the sum of the power from all the other frequencies,

removing power from its harmonics. The value for SNR is

expressed in decibels.

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

SINAD is calculated by inputting a 50 Hz signal, and samples

are acquired for 2 sec. The amplitudes for each frequency up to

the bandwidth given in Table 1 as the ADC output bandwidth

(−3 dB) are calculated. To determine the SINAD, the signal at

50 Hz is compared to the sum of the power from all the other

frequencies. The value for SINAD is expressed in decibels.

Total Harmonic Distortion (THD)

THD is calculated by inputting a 50 Hz signal, and samples are

acquired for over 2 sec. The amplitudes for each frequency up

to the bandwidth given in Table 1 as the ADC output

bandwidth (−3 dB) are calculated. To determine the THD, the

amplitudes of the 50 Hz harmonics up to the bandwidth are

root sum squared. The value for THD is expressed in decibels.

Spurious-Free Dynamic Range (SFDR)

SFDR is calculated by inputting a 50 Hz signal, and samples are

acquired for over 2 sec. The amplitudes for each frequency up

to the bandwidth given in Table 1 as the ADC output bandwidth

(−3 dB) are calculated. To determine the SFDR, the amplitude

of the largest signal that is not a harmonic of 50 Hz is recorded.

The value for SFDR is expressed in decibels.

ADC Output Pass Band

The ADC output pass band is the bandwidth within 0.1 dB,

resulting from the digital filtering in the sinc4 and sinc4 + IIR LPF.

ADC Output Bandwidth

The ADC output bandwidth is the bandwidth within −3 dB,

resulting from the digital filtering in the sinc4 and sinc4 + IIR LPF.

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