ADE7913 datasheet(16/44 Pages) AD

16 / 44 page

ADE7912/ADE7913

Data Sheet

Rev. 0 | Page 16 of 44

TERMINOLOGY

Pseudo Differential Signal Voltage Range Between IP and

IM, V1P and VM, and V2P and VM Pins

The range represents the peak-to-peak pseudo differential

voltage that must be applied to the ADCs to generate a full-scale

response when the IM and VM pins are connected to GNDISO,

Pin 2. The IM and VM pins are connected to GNDISO using

antialiasing filters (see Figure 20). Figure 21 illustrates the input

voltage range between IP and IM; Figure 22 illustrates the input

voltage range between V1P and VM and between V2P and VM.

Figure 21. Pseudo Differential Input Voltage Range Between IP and IM Pins

Figure 22. Pseudo Differential Input Voltage Range Between V1P and VM

Pins and Between V2P and VM

Maximum VM and IM Voltage Range

The range represents the maximum allowed voltage at VM and

IM pins relative to GNDISO, Pin 10.

Crosstalk

Crosstalk represents leakage of signals, usually via capacitance

between circuits. Crosstalk is measured in the current channel

by setting the IP and IM pins to GNDISO, Pin 10, supplying a

full-scale alternate differential voltage between the V1P and VM

pins and between the V2P and VM pins of the voltage channel,

and measuring the output of the current channel. It is measured

in the V1P voltage channel by setting the V1P and VM pins to

GNDISO, Pin 10, supplying a full-scale alternate differential voltage

at the IP and V2P pin, and measuring the output of the V1P

channel. Crosstalk is measured in the V2P voltage channel by

setting the V2P and VM pins to GNDISO, Pin 10, supplying a full-

scale alternate differential voltage at the IP and V1P pins, and

measuring the output of the V2P channel. 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

2 sec. Crosstalk is expressed in decibels.

Input Impedance to Ground (DC)

The input impedance to ground represents the impedance

measured at each ADC input pin (IP, IM, V1P, V2P, and VM)

with respect to GNDISO, Pin 10.

Differential Input Impedance (DC)

The differential input impedance represents the impedance

measured between the ADC inputs: IP and IM, V1P and VM,

and V2P and VM (ADE7913 only).

ADC Offset Error

ADC offset error is the difference between the average

measured ADC output code with both inputs connected to

GNDISO and the ideal ADC output code. The magnitude of

the offset depends on the input range of each channel.

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. The offset drift over

temperature is computed as follows:

(

)

( )

( ) (

)

( )

( ) (

) 









−

max

Offset

Drift

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 current or voltage channel.

IP – IM

+31.25mV

–31.25mV

+31.25mV

–31.25mV

+500mV

–500mV

+500mV

–500mV

V1P, V2P

V1P – VM,

V2P – VM

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