ADE9430 datasheet(22/35 Pages) AD

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Data Sheet

ADE9430

TERMINOLOGY

analog.com

Rev. 0 | 22 of 35

Crosstalk

Crosstalk is measured by grounding one channel and applying a

full-scale 50 Hz or 60 Hz signal on all other channels. The crosstalk

is equal to the ratio between the grounded ADC output value and its

ADC full-scale output value. The ADC outputs are acquired for 100

sec. Crosstalk is expressed in decibels.

Differential Input Impedance DC

The differential input impedance dc represents the impedance be-

tween the IxP and IxN pair or VxP and VxN pair. It varies with the

PGA gain selection as indicated in the Table 1.

ADC Offset

ADC offset is the difference between the average measured ADC

output code with both inputs connected to GND and the ideal ADC

output code of zero. ADC offset is expressed in mV.

ADC Offset Drift over Temperature

The ADC offset drift is the change in offset over temperature. It is

measured at −40°C, +25°C, and +85°C. Calculate the offset drift

over temperature as follows:

Drift=

max Offset−40°C−Offset+25°C

−40°C−+25°C

Offset+85°C −Offset+25°C

+85°C−+25°C

(1)

Offset drift is expressed in µV/°C.

ADC Gain Error

ADC gain error represents the difference between the measured

ADC output code (minus the offset) and the ideal output code when

an external voltage reference of 1.2 V is used. The difference is

expressed as a percentage of the ideal code. It represents the

overall gain error of one channel.

ADC Gain Drift over Temperature

This temperature coefficient includes the temperature variation of

the ADC gain while using an external voltage reference of 1.2 V.

It represents the overall temperature coefficient of one current or

voltage channel. With an external voltage reference of 1.2 V in use,

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

temperature coefficient is computed as follows:

Drift=

max Gain−40°C−Gain+25°C

Gain(+25°C)× −40°C−+25°C

Gain+85°C −Gain+25°C

Gain(+25°C)× +85°C−+25°C

(2)

Gain drift is measured in ppm/°C.

AC Power Supply Rejection (PSRR)

AC PSRR quantifies the measurement error as a percentage of

reading when the dc power supply is nominal (VNOM) and modu-

lated with ac, and the inputs are grounded. For the ac PSRR

measurement, 20 sec samples are captured with nominal supplies

(3.3 V, which is V1) and a second set (V2) is 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 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 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 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 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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