ADE9103 datasheet(23/55 Pages) AD

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Data Sheet

ADE9103/ADE9112/ADE9113

TERMINOLOGY

analog.com

Rev. A | 23 of 55

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 +125°C. The offset drift over

temperature is computed as follows:

Drift‐40 to +125= Offset−40−Offset+125

−40−125

Offset drift is expressed in nV/°C.

Gain Error

The gain error in the ADCs represents the difference between

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

output code when the internal voltage reference is used (see the

Analog-to-Digital Conversion section). The difference is expressed

as a percentage of the ideal code. It represents the overall gain

error of one of the current or one of the voltage channels.

Gain Drift over Temperature

This temperature coefficient includes the temperature variation of

the ADC gain and of the internal voltage reference. It represents the

overall temperature coefficient of one current or one of the voltage

channels. With the internal voltage reference in use, the ADC

gain is measured at −40°C, +25°C, and +125°C. The temperature

coefficient is computed as follows:

Drift‐40 to +125= Gain−40−Gain+125

Gain+25 × −40−125

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 measure-

ment, 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

(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 3.125 mV peak, and the voltages between the V1P and V1M

pins and between the V2P and V2M pins are 100 mV peak. 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).

Common-Mode Rejection Ratio (CMRR)

CMRR is defined as the differential gain of the channel divided by

the common-mode gain.

IP − IM = 31.25 mV peak differential is applied, and an FFT is used

to measure the fundamental in dB.

IP = IM = 31.25 mV peak to the local ground reference, Pin 11,

common-mode is applied, and an FFT is used to measure the

fundamental in dB.

VxP - VxM = 100 mV peak differential is applied, and an FFT is

used to measure the fundamental in dB.

VxP = VxM = 100 mV peak to the local ground reference, Pin

11, common-mode is applied, and an FFT is used to measure the

fundamental in dB.

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 within the bandwidth,

excluding harmonics and DC. The waveform samples are coherent-

ly sampled over approximately 8 sec to avoid using a window

function. The value for SNR is expressed in decibels relative to

full-scale (dBFS).

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 within the bandwidth,

including harmonics but excluding DC. The waveform samples are

coherently sampled over approximately 8 sec to avoid using a

window function. The value for SINAD is expressed in decibels

relative to full-scale (dBFS).

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 waveform samples are coherently sampled over approximately

8 sec to avoid using a window function. The value for SNR is

expressed in decibels relative to full-scale (dBFS).

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 waveform samples are

coherently sampled over approximately 8 sec to avoid using a

window function. The value of SFDR is expressed in decibels

relative to full scale (dBFS).

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