ADE7932 datasheet(28/120 Pages) AD

28 / 120 page

ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 28 of 120

Pseudo Differential Signal Voltage Range Between the IP

and IM Pins, V1P and VM Pins, and V2P and VM Pins

This range represents the peak-to-peak pseudo differential volt-

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

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

pin (Pin 2). The IM and VM pins are connected to the GNDISO

pin using antialiasing filters (see Figure 34).

Figure 35 shows the input voltage range between the IP and IM

pins. Figure 36 shows the input voltage range between the V1P

and VM pins and between the V2P and VM pins.

IP – IM

+31.25mV

–31.25mV

+31.25mV

–31.25mV

Figure 35. Pseudo Differential Input Voltage Range

Between the IP and IM Pins

+500mV

–500mV

+500mV

–500mV

V1P, V2P

V1P – VM,

V2P – VM

Figure 36. Pseudo Differential Input Voltage Range

Between the V1P and VM Pins and Between the V2P and VM Pins

Maximum VM and IM Voltage Range

The maximum VM and IM voltage range represents the maxi-

mum allowed voltage at the VM and IM pins relative to the

GNDISO pin (Pin 10).

Crosstalk

Crosstalk represents the leakage of signals, usually via capacitance

between circuits. Crosstalk in the current channel is measured by

setting the IP and IM pins to the GNDISO pin (Pin 10), supplying

a full-scale alternate differential voltage between the V1P, V2P,

and VM pins of the voltage channel, and measuring the output

of the current channel.

Crosstalk in the V1P voltage channel is measured by setting the

V1P and VM pins to the GNDISO pin (Pin 10), supplying a full-

scale alternate differential voltage at the IP and V2P pins, and

measuring the output of the V1P channel. Crosstalk in the V2P

voltage channel is measured by setting the V2P and VM pins to

the GNDISO pin (Pin 10), supplying a full-scale alternate differ-

ential voltage at the IP and V1P pins, and measuring the output

of the V2P channel.

Crosstalk is equal to the ratio between the grounded ADC

output value and the 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 (ADE7933 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

ADC offset drift is the change in offset over temperature.

ADC offset drift is determined by measuring the ADC offset

at −40°C, +25°C, and +85°C. The offset drift over temperature

is computed as follows:

Drift =

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

) 











−

max

Offset

Offset drift is expressed in nV/°C.

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