ADE9153AACPZ datasheet(19/50 Pages) AD

19 / 50 page

Data Sheet

ADE9153A

Rev. 0 | Page 19 of 50

TERMINOLOGY

Crosstalk

Crosstalk is measured by grounding one channel and applying a

full-scale 50 Hz or 70 Hz signal on all the 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 200 sec. Crosstalk is expressed in decibels.

Differential Input Impedance (DC)

The differential input impedance represents the impedance

between the IAP and IAN pair, the IBP and IBN pair, or the

VAP and VAN pair.

ADC Offset

ADC offset is the difference between the average measured

ADC output code with both inputs connected to ground 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:



































































(

max

Offset

Drift

Offset drift is expressed in μV/°C.

Channel Drift over Temperature

The channel drift over temperature coefficient includes the

temperature variation of the PGA and ADC gain when using

the internal voltage reference. This coefficient represents the overall

temperature coefficient of one channel. With the internal voltage

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

Then, the temperature coefficient is calculated as follows:



 





































































(

max

Gain

Drift

Gain drift is measured in ppm/°C.

ADC 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 an external voltage reference of 1.25 V is used.

The difference is expressed as a percentage of the ideal code and

represents the overall gain error of one channel.

AC Power Supply Rejection (AC 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,

100 sec of samples are captured with nominal supplies (3.3 V) and a

second set is captured with an additional ac signal (233 mV rms at

100 Hz) introduced onto the supplies. Then, the PSRR is

expressed as PSRR = 20 log10(VRIPPLE/VNOMINAL).

Signal-to-Noise Ratio (SNR)

SNR is calculated by inputting a 50 Hz signal, and acquiring

samples over 10 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.

ADC Output Pass Band

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

resulting from the digital filtering in the sinc4 filter and sinc4

filter + infinite impulse response (IIR), low-pass filter (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.

Speed of Convergence

The speed of convergence is the time it takes for mSure to

reach a certain level of accuracy. This speed, or time required, is

logarithmically proportional to the required accuracy. In other

words, if a greater accuracy is required in mSure autocalibration,

the time required increases logarithmically.

Similarly, the speed is related to the power mode in which

mSure is being run: the lower the power mode, the slower the

speed of convergence. This relationship is shown in Table 2 for

the specified system. The speed of convergence determines the

time it takes to complete the autocalibration process and to reach

a certain specified accuracy.

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